source/glsl/spirv.cpp

   1 #include <msp/core/algorithm.h>
   2 #include <msp/core/maputils.h>
   3 #include <msp/core/raii.h>
   4 #include "reflect.h"
   5 #include "spirv.h"
   6
   7 using namespace std;
   8
   9 namespace Msp {
  10 namespace GL {
  11 namespace SL {
  12
  13 const SpirVGenerator::BuiltinFunctionInfo SpirVGenerator::builtin_functions[] =
  14 {
  15         { "radians", "f", "GLSL.std.450", GLSL450_RADIANS, { 1 }, 0, 0 },
  16         { "degrees", "f", "GLSL.std.450", GLSL450_DEGREES, { 1 }, 0, 0 },
  17         { "sin", "f", "GLSL.std.450", GLSL450_SIN, { 1 }, 0, 0 },
  18         { "cos", "f", "GLSL.std.450", GLSL450_COS, { 1 }, 0, 0 },
  19         { "tan", "f", "GLSL.std.450", GLSL450_TAN, { 1 }, 0, 0 },
  20         { "asin", "f", "GLSL.std.450", GLSL450_ASIN, { 1 }, 0, 0 },
  21         { "acos", "f", "GLSL.std.450", GLSL450_ACOS, { 1 }, 0, 0 },
  22         { "atan", "f", "GLSL.std.450", GLSL450_ATAN, { 1 }, 0, 0 },
  23         { "atan", "ff", "GLSL.std.450", GLSL450_ATAN2, { 1, 2 }, 0, 0 },
  24         { "sinh", "f", "GLSL.std.450", GLSL450_SINH, { 1 }, 0, 0 },
  25         { "cosh", "f", "GLSL.std.450", GLSL450_COSH, { 1 }, 0, 0 },
  26         { "tanh", "f", "GLSL.std.450", GLSL450_TANH, { 1 }, 0, 0 },
  27         { "asinh", "f", "GLSL.std.450", GLSL450_ASINH, { 1 }, 0, 0 },
  28         { "acosh", "f", "GLSL.std.450", GLSL450_ACOSH, { 1 }, 0, 0 },
  29         { "atanh", "f", "GLSL.std.450", GLSL450_ATANH, { 1 }, 0, 0 },
  30         { "pow", "ff", "GLSL.std.450", GLSL450_POW, { 1, 2 }, 0, 0 },
  31         { "exp", "f", "GLSL.std.450", GLSL450_EXP, { 1 }, 0, 0 },
  32         { "log", "f", "GLSL.std.450", GLSL450_LOG, { 1 }, 0, 0 },
  33         { "exp2", "f", "GLSL.std.450", GLSL450_EXP2, { 1 }, 0, 0 },
  34         { "log2", "f", "GLSL.std.450", GLSL450_LOG2, { 1 }, 0, 0 },
  35         { "sqrt", "f", "GLSL.std.450", GLSL450_SQRT, { 1 }, 0, 0 },
  36         { "inversesqrt", "f", "GLSL.std.450", GLSL450_INVERSE_SQRT, { 1 }, 0, 0 },
  37         { "abs", "f", "GLSL.std.450", GLSL450_F_ABS, { 1 }, 0, 0 },
  38         { "abs", "i", "GLSL.std.450", GLSL450_S_ABS, { 1 }, 0, 0 },
  39         { "sign", "f", "GLSL.std.450", GLSL450_F_SIGN, { 1 }, 0, 0 },
  40         { "sign", "i", "GLSL.std.450", GLSL450_S_SIGN, { 1 }, 0, 0 },
  41         { "floor", "f", "GLSL.std.450", GLSL450_FLOOR, { 1 }, 0, 0 },
  42         { "trunc", "f", "GLSL.std.450", GLSL450_TRUNC, { 1 }, 0, 0 },
  43         { "round", "f", "GLSL.std.450", GLSL450_ROUND, { 1 }, 0, 0 },
  44         { "roundEven", "f", "GLSL.std.450", GLSL450_ROUND_EVEN, { 1 }, 0, 0 },
  45         { "ceil", "f", "GLSL.std.450", GLSL450_CEIL, { 1 }, 0, 0 },
  46         { "fract", "f", "GLSL.std.450", GLSL450_FRACT, { 1 }, 0, 0 },
  47         { "mod", "f", "", OP_F_MOD, { 1, 2 }, 0, 0 },
  48         { "min", "ff", "GLSL.std.450", GLSL450_F_MIN, { 1, 2 }, 0, 0 },
  49         { "min", "ii", "GLSL.std.450", GLSL450_S_MIN, { 1, 2 }, 0, 0 },
  50         { "min", "uu", "GLSL.std.450", GLSL450_U_MIN, { 1, 2 }, 0, 0 },
  51         { "max", "ff", "GLSL.std.450", GLSL450_F_MAX, { 1, 2 }, 0, 0 },
  52         { "max", "ii", "GLSL.std.450", GLSL450_S_MAX, { 1, 2 }, 0, 0 },
  53         { "max", "uu", "GLSL.std.450", GLSL450_U_MAX, { 1, 2 }, 0, 0 },
  54         { "clamp", "fff", "GLSL.std.450", GLSL450_F_CLAMP, { 1, 2, 3 }, 0, 0 },
  55         { "clamp", "iii", "GLSL.std.450", GLSL450_S_CLAMP, { 1, 2, 3 }, 0, 0 },
  56         { "clamp", "uuu", "GLSL.std.450", GLSL450_U_CLAMP, { 1, 2, 3 }, 0, 0 },
  57         { "mix", "fff", "GLSL.std.450", GLSL450_F_MIX, { 1, 2, 3 }, 0, 0 },
  58         { "mix", "ffb", "", OP_SELECT, { 3, 2, 1 }, 0, 0 },
  59         { "mix", "iib", "", OP_SELECT, { 3, 2, 1 }, 0, 0 },
  60         { "mix", "uub", "", OP_SELECT, { 3, 2, 1 }, 0, 0 },
  61         { "step", "ff", "GLSL.std.450", GLSL450_F_STEP, { 1, 2 }, 0, 0 },
  62         { "smoothstep", "fff", "GLSL.std.450", GLSL450_F_SMOOTH_STEP, { 1, 2, 3 }, 0, 0 },
  63         { "isnan", "f", "", OP_IS_NAN, { 1 }, 0, 0 },
  64         { "isinf", "f", "", OP_IS_INF, { 1 }, 0, 0 },
  65         { "fma", "fff", "GLSL.std.450", GLSL450_F_FMA, { 1, 2, 3 }, 0, 0 },
  66         { "length", "f", "GLSL.std.450", GLSL450_LENGTH, { 1 }, 0, 0 },
  67         { "distance", "ff", "GLSL.std.450", GLSL450_DISTANCE, { 1, 2 }, 0, 0 },
  68         { "dot", "ff", "", OP_DOT, { 1, 2 }, 0, 0 },
  69         { "cross", "ff", "GLSL.std.450", GLSL450_CROSS, { 1, 2 }, 0, 0 },
  70         { "normalize", "f", "GLSL.std.450", GLSL450_NORMALIZE, { 1 }, 0, 0 },
  71         { "faceforward", "fff", "GLSL.std.450", GLSL450_FACE_FORWARD, { 1, 2, 3 }, 0, 0 },
  72         { "reflect", "ff", "GLSL.std.450", GLSL450_REFLECT, { 1, 2 }, 0, 0 },
  73         { "refract", "fff", "GLSL.std.450", GLSL450_REFRACT, { 1, 2, 3 }, 0, 0 },
  74         { "matrixCompMult", "ff", "", 0, { 0 }, 0, &SpirVGenerator::visit_builtin_matrix_comp_mult },
  75         { "outerProduct", "ff", "", OP_OUTER_PRODUCT, { 1, 2 }, 0, 0 },
  76         { "transpose", "f", "", OP_TRANSPOSE, { 1 }, 0, 0 },
  77         { "determinant", "f", "GLSL.std.450", GLSL450_DETERMINANT, { 1 }, 0, 0 },
  78         { "inverse", "f", "GLSL.std.450", GLSL450_MATRIX_INVERSE, { 1 }, 0, 0 },
  79         { "lessThan", "ff", "", OP_F_ORD_LESS_THAN, { 1, 2 }, 0, 0 },
  80         { "lessThan", "ii", "", OP_S_LESS_THAN, { 1, 2 }, 0, 0 },
  81         { "lessThan", "uu", "", OP_U_LESS_THAN, { 1, 2 }, 0, 0 },
  82         { "lessThanEqual", "ff", "", OP_F_ORD_LESS_THAN_EQUAL, { 1, 2 }, 0, 0 },
  83         { "lessThanEqual", "ii", "", OP_S_LESS_THAN_EQUAL, { 1, 2 }, 0, 0 },
  84         { "lessThanEqual", "uu", "", OP_U_LESS_THAN_EQUAL, { 1, 2 }, 0, 0 },
  85         { "greaterThan", "ff", "", OP_F_ORD_GREATER_THAN, { 1, 2 }, 0, 0 },
  86         { "greaterThan", "ii", "", OP_S_GREATER_THAN, { 1, 2 }, 0, 0 },
  87         { "greaterThan", "uu", "", OP_U_GREATER_THAN, { 1, 2 }, 0, 0 },
  88         { "greaterThanEqual", "ff", "", OP_F_ORD_GREATER_THAN_EQUAL, { 1, 2 }, 0, 0 },
  89         { "greaterThanEqual", "ii", "", OP_S_GREATER_THAN_EQUAL, { 1, 2 }, 0, 0 },
  90         { "greaterThanEqual", "uu", "", OP_U_GREATER_THAN_EQUAL, { 1, 2 }, 0, 0 },
  91         { "equal", "ff", "", OP_F_ORD_EQUAL, { 1, 2 }, 0, 0 },
  92         { "equal", "ii", "", OP_I_EQUAL, { 1, 2 }, 0, 0 },
  93         { "equal", "uu", "", OP_I_EQUAL, { 1, 2 }, 0, 0 },
  94         { "notEqual", "ff", "", OP_F_ORD_NOT_EQUAL, { 1, 2 }, 0, 0 },
  95         { "notEqual", "ii", "", OP_I_NOT_EQUAL, { 1, 2 }, 0, 0 },
  96         { "notEqual", "uu", "", OP_I_NOT_EQUAL, { 1, 2 }, 0, 0 },
  97         { "any", "b", "", OP_ANY, { 1 }, 0, 0 },
  98         { "all", "b", "", OP_ALL, { 1 }, 0, 0 },
  99         { "not", "b", "", OP_LOGICAL_NOT, { 1 }, 0, 0 },
 100         { "bitfieldExtract", "iii", "", OP_BIT_FIELD_S_EXTRACT, { 1, 2, 3 }, 0, 0 },
 101         { "bitfieldExtract", "uii", "", OP_BIT_FIELD_U_EXTRACT, { 1, 2, 3 }, 0, 0 },
 102         { "bitfieldInsert", "iiii", "", OP_BIT_FIELD_INSERT, { 1, 2, 3, 4 }, 0, 0 },
 103         { "bitfieldInsert", "uuii", "", OP_BIT_FIELD_INSERT, { 1, 2, 3, 4 }, 0, 0 },
 104         { "bitfieldReverse", "i", "", OP_BIT_REVERSE, { 1 }, 0, 0 },
 105         { "bitfieldReverse", "u", "", OP_BIT_REVERSE, { 1 }, 0, 0 },
 106         { "bitCount", "i", "", OP_BIT_COUNT, { 1 }, 0, 0 },
 107         { "findLSB", "i", "GLSL.std.450", GLSL450_FIND_I_LSB, { 1 }, 0, 0 },
 108         { "findLSB", "u", "GLSL.std.450", GLSL450_FIND_I_LSB, { 1 }, 0, 0 },
 109         { "findMSB", "i", "GLSL.std.450", GLSL450_FIND_S_MSB, { 1 }, 0, 0 },
 110         { "findMSB", "u", "GLSL.std.450", GLSL450_FIND_U_MSB, { 1 }, 0, 0 },
 111         { "textureSize", "", "", 0, { }, CAP_IMAGE_QUERY, &SpirVGenerator::visit_builtin_texture_query },
 112         { "textureQueryLod", "", "", 0, { }, CAP_IMAGE_QUERY, &SpirVGenerator::visit_builtin_texture_query },
 113         { "textureQueryLevels", "", "", 0, { }, CAP_IMAGE_QUERY, &SpirVGenerator::visit_builtin_texture_query },
 114         { "textureSamples", "", "", 0, { }, CAP_IMAGE_QUERY, &SpirVGenerator::visit_builtin_texture_query },
 115         { "texture", "", "", 0, { }, 0, &SpirVGenerator::visit_builtin_texture },
 116         { "textureLod", "", "", 0, { }, 0, &SpirVGenerator::visit_builtin_texture },
 117         { "texelFetch", "", "", 0, { }, 0, &SpirVGenerator::visit_builtin_texture_fetch },
 118         { "imageSize", "", "", 0, { }, CAP_IMAGE_QUERY, &SpirVGenerator::visit_builtin_texture_query },
 119         { "imageSamples", "", "", 0, { }, CAP_IMAGE_QUERY, &SpirVGenerator::visit_builtin_texture_query },
 120         { "imageLoad", "", "", 0, { }, 0, &SpirVGenerator::visit_builtin_texture_fetch },
 121         { "imageStore", "", "", 0, { }, 0, &SpirVGenerator::visit_builtin_texture_store },
 122         { "EmitVertex", "", "", OP_EMIT_VERTEX, { }, 0, 0 },
 123         { "EndPrimitive", "", "", OP_END_PRIMITIVE, { }, 0, 0 },
 124         { "dFdx", "f", "", OP_DP_DX, { 1 }, 0, 0 },
 125         { "dFdy", "f", "", OP_DP_DY, { 1 }, 0, 0 },
 126         { "dFdxFine", "f", "", OP_DP_DX_FINE, { 1 }, CAP_DERIVATIVE_CONTROL, 0 },
 127         { "dFdyFine", "f", "", OP_DP_DY_FINE, { 1 }, CAP_DERIVATIVE_CONTROL, 0 },
 128         { "dFdxCoarse", "f", "", OP_DP_DX_COARSE, { 1 }, CAP_DERIVATIVE_CONTROL, 0 },
 129         { "dFdyCoarse", "f", "", OP_DP_DY_COARSE, { 1 }, CAP_DERIVATIVE_CONTROL, 0 },
 130         { "fwidth", "f", "", OP_FWIDTH, { 1 }, 0, 0 },
 131         { "fwidthFine", "f", "", OP_FWIDTH_FINE, { 1 }, CAP_DERIVATIVE_CONTROL, 0 },
 132         { "fwidthCoarse", "f", "", OP_FWIDTH_COARSE, { 1 }, CAP_DERIVATIVE_CONTROL, 0 },
 133         { "interpolateAtCentroid", "", "", 0, { }, CAP_INTERPOLATION_FUNCTION, &SpirVGenerator::visit_builtin_interpolate },
 134         { "interpolateAtSample", "", "", 0, { }, CAP_INTERPOLATION_FUNCTION, &SpirVGenerator::visit_builtin_interpolate },
 135         { "interpolateAtOffset", "", "", 0, { }, CAP_INTERPOLATION_FUNCTION, &SpirVGenerator::visit_builtin_interpolate },
 136         { "", "", "", 0, { }, 0, 0 }
 137 };
 138
 139 SpirVGenerator::SpirVGenerator():
 140         writer(content)
 141 { }
 142
 143 void SpirVGenerator::apply(Module &module, const Features &f)
 144 {
 145         features = f;
 146         use_capability(CAP_SHADER);
 147
 148         for(Stage &s: module.stages)
 149         {
 150                 stage = &s;
 151                 interface_layouts.clear();
 152                 s.content.visit(*this);
 153         }
 154
 155         writer.finalize(SPIRV_GENERATOR_MSP, next_id);
 156 }
 157
 158 SpirVGenerator::StorageClass SpirVGenerator::get_interface_storage(const string &iface, bool block)
 159 {
 160         if(iface=="in")
 161                 return STORAGE_INPUT;
 162         else if(iface=="out")
 163                 return STORAGE_OUTPUT;
 164         else if(iface=="uniform")
 165                 return (block ? STORAGE_UNIFORM : STORAGE_UNIFORM_CONSTANT);
 166         else if(iface.empty())
 167                 return STORAGE_PRIVATE;
 168         else
 169                 throw invalid_argument("SpirVGenerator::get_interface_storage");
 170 }
 171
 172 SpirVGenerator::BuiltinSemantic SpirVGenerator::get_builtin_semantic(const string &name)
 173 {
 174         if(name=="gl_Position")
 175                 return BUILTIN_POSITION;
 176         else if(name=="gl_PointSize")
 177                 return BUILTIN_POINT_SIZE;
 178         else if(name=="gl_ClipDistance")
 179                 return BUILTIN_CLIP_DISTANCE;
 180         else if(name=="gl_VertexID")
 181                 return BUILTIN_VERTEX_ID;
 182         else if(name=="gl_InstanceID")
 183                 return BUILTIN_INSTANCE_ID;
 184         else if(name=="gl_PrimitiveID" || name=="gl_PrimitiveIDIn")
 185                 return BUILTIN_PRIMITIVE_ID;
 186         else if(name=="gl_InvocationID")
 187                 return BUILTIN_INVOCATION_ID;
 188         else if(name=="gl_Layer")
 189                 return BUILTIN_LAYER;
 190         else if(name=="gl_FragCoord")
 191                 return BUILTIN_FRAG_COORD;
 192         else if(name=="gl_PointCoord")
 193                 return BUILTIN_POINT_COORD;
 194         else if(name=="gl_FrontFacing")
 195                 return BUILTIN_FRONT_FACING;
 196         else if(name=="gl_SampleId")
 197                 return BUILTIN_SAMPLE_ID;
 198         else if(name=="gl_SamplePosition")
 199                 return BUILTIN_SAMPLE_POSITION;
 200         else if(name=="gl_FragDepth")
 201                 return BUILTIN_FRAG_DEPTH;
 202         else if(name=="gl_NumWorkGroups")
 203                 return BUILTIN_NUM_WORKGROUPS;
 204         else if(name=="gl_WorkGroupSize")
 205                 return BUILTIN_WORKGROUP_SIZE;
 206         else if(name=="gl_WorkGroupID")
 207                 return BUILTIN_WORKGROUP_ID;
 208         else if(name=="gl_LocalInvocationID")
 209                 return BUILTIN_LOCAL_INVOCATION_ID;
 210         else if(name=="gl_GlobalInvocationID")
 211                 return BUILTIN_GLOBAL_INVOCATION_ID;
 212         else if(name=="gl_LocalInvocationIndex")
 213                 return BUILTIN_LOCAL_INVOCATION_INDEX;
 214         else
 215                 throw invalid_argument("SpirVGenerator::get_builtin_semantic");
 216 }
 217
 218 SpirVFormat SpirVGenerator::get_format(const std::string &name)
 219 {
 220         if(name.empty())
 221                 return FORMAT_UNKNOWN;
 222         else if(name=="rgba32f")
 223                 return FORMAT_RGBA32F;
 224         else if(name=="rgba16f")
 225                 return FORMAT_RGBA16F;
 226         else if(name=="r32f")
 227                 return FORMAT_R32F;
 228         else if(name=="rgba8")
 229                 return FORMAT_RGBA8;
 230         else if(name=="rgba8_snorm")
 231                 return FORMAT_RGBA8_SNORM;
 232         else if(name=="rg32f")
 233                 return FORMAT_RG32F;
 234         else if(name=="rg16f")
 235                 return FORMAT_RG16F;
 236         else if(name=="r16f")
 237                 return FORMAT_R16F;
 238         else if(name=="rgba16")
 239                 return FORMAT_RGBA16;
 240         else if(name=="rg16")
 241                 return FORMAT_RG16;
 242         else if(name=="rg8")
 243                 return FORMAT_RG8;
 244         else if(name=="r16")
 245                 return FORMAT_RG16;
 246         else if(name=="r8")
 247                 return FORMAT_RG8;
 248         else if(name=="rgba16_snorm")
 249                 return FORMAT_RGBA16_SNORM;
 250         else if(name=="rg16_snorm")
 251                 return FORMAT_RG16_SNORM;
 252         else if(name=="rg8_snorm")
 253                 return FORMAT_RG8_SNORM;
 254         else if(name=="r16_snorm")
 255                 return FORMAT_RG16_SNORM;
 256         else if(name=="r8_snorm")
 257                 return FORMAT_RG8_SNORM;
 258         else
 259                 throw invalid_argument("SpirVGenerator::get_format");
 260 }
 261
 262 void SpirVGenerator::use_capability(Capability cap)
 263 {
 264         if(used_capabilities.count(cap))
 265                 return;
 266
 267         used_capabilities.insert(cap);
 268         writer.write_op(content.capabilities, OP_CAPABILITY, cap);
 269 }
 270
 271 SpirVGenerator::Id SpirVGenerator::import_extension(const string &name)
 272 {
 273         Id &ext_id = imported_extension_ids[name];
 274         if(!ext_id)
 275         {
 276                 ext_id = next_id++;
 277                 writer.begin_op(content.extensions, OP_EXT_INST_IMPORT);
 278                 writer.write(ext_id);
 279                 writer.write_string(name);
 280                 writer.end_op(OP_EXT_INST_IMPORT);
 281         }
 282         return ext_id;
 283 }
 284
 285 SpirVGenerator::Id SpirVGenerator::get_id(Node &node) const
 286 {
 287         return get_item(declared_ids, &node).id;
 288 }
 289
 290 SpirVGenerator::Id SpirVGenerator::allocate_id(Node &node, Id type_id)
 291 {
 292         auto i = declared_ids.find(&node);
 293         if(i!=declared_ids.end())
 294         {
 295                 if(i->second.type_id)
 296                         throw key_error(&node);
 297                 i->second.type_id = type_id;
 298                 return i->second.id;
 299         }
 300
 301         Id id = next_id++;
 302         declared_ids.insert(make_pair(&node, Declaration(id, type_id)));
 303         return id;
 304 }
 305
 306 SpirVGenerator::Id SpirVGenerator::allocate_forward_id(Node &node)
 307 {
 308         auto i = declared_ids.find(&node);
 309         if(i!=declared_ids.end())
 310                 return i->second.id;
 311
 312         Id id = next_id++;
 313         declared_ids.insert(make_pair(&node, Declaration(id, 0)));
 314         return id;
 315 }
 316
 317 SpirVGenerator::Id SpirVGenerator::write_constant(Id type_id, Word value, bool spec)
 318 {
 319         Id const_id = next_id++;
 320         if(is_scalar_type(type_id, BasicTypeDeclaration::BOOL))
 321         {
 322                 Opcode opcode = (value ? (spec ? OP_SPEC_CONSTANT_TRUE : OP_CONSTANT_TRUE) :
 323                         (spec ? OP_SPEC_CONSTANT_FALSE : OP_CONSTANT_FALSE));
 324                 writer.write_op(content.globals, opcode, type_id, const_id);
 325         }
 326         else
 327         {
 328                 Opcode opcode = (spec ? OP_SPEC_CONSTANT : OP_CONSTANT);
 329                 writer.write_op(content.globals, opcode, type_id, const_id, value);
 330         }
 331         return const_id;
 332 }
 333
 334 SpirVGenerator::ConstantKey SpirVGenerator::get_constant_key(Id type_id, const Variant &value)
 335 {
 336         if(value.check_type<bool>())
 337                 return ConstantKey(type_id, value.value<bool>());
 338         else if(value.check_type<int>())
 339                 return ConstantKey(type_id, value.value<int>());
 340         else if(value.check_type<unsigned>())
 341                 return ConstantKey(type_id, value.value<unsigned>());
 342         else if(value.check_type<float>())
 343                 return ConstantKey(type_id, value.value<float>());
 344         else
 345                 throw invalid_argument("SpirVGenerator::get_constant_key");
 346 }
 347
 348 SpirVGenerator::Id SpirVGenerator::get_constant_id(Id type_id, const Variant &value)
 349 {
 350         ConstantKey key = get_constant_key(type_id, value);
 351         Id &const_id = constant_ids[key];
 352         if(!const_id)
 353                 const_id = write_constant(type_id, key.int_value, false);
 354         return const_id;
 355 }
 356
 357 SpirVGenerator::Id SpirVGenerator::get_vector_constant_id(Id type_id, unsigned size, Id scalar_id)
 358 {
 359         Id &const_id = constant_ids[get_constant_key(type_id, static_cast<int>(scalar_id))];
 360         if(!const_id)
 361         {
 362                 const_id = next_id++;
 363                 writer.begin_op(content.globals, OP_CONSTANT_COMPOSITE, 3+size);
 364                 writer.write(type_id);
 365                 writer.write(const_id);
 366                 for(unsigned i=0; i<size; ++i)
 367                         writer.write(scalar_id);
 368                 writer.end_op(OP_CONSTANT_COMPOSITE);
 369         }
 370         return const_id;
 371 }
 372
 373 SpirVGenerator::Id SpirVGenerator::get_standard_type_id(BasicTypeDeclaration::Kind kind, unsigned size, bool sign)
 374 {
 375         Id base_id = (size>1 ? get_standard_type_id(kind, 1, sign) : 0);
 376         Id &type_id = standard_type_ids[base_id ? TypeKey(base_id, size) : TypeKey(kind, sign)];
 377         if(!type_id)
 378         {
 379                 type_id = next_id++;
 380                 if(size>1)
 381                         writer.write_op(content.globals, OP_TYPE_VECTOR, type_id, base_id, size);
 382                 else if(kind==BasicTypeDeclaration::VOID)
 383                         writer.write_op(content.globals, OP_TYPE_VOID, type_id);
 384                 else if(kind==BasicTypeDeclaration::BOOL)
 385                         writer.write_op(content.globals, OP_TYPE_BOOL, type_id);
 386                 else if(kind==BasicTypeDeclaration::INT)
 387                         writer.write_op(content.globals, OP_TYPE_INT, type_id, 32, sign);
 388                 else if(kind==BasicTypeDeclaration::FLOAT)
 389                         writer.write_op(content.globals, OP_TYPE_FLOAT, type_id, 32);
 390                 else
 391                         throw invalid_argument("SpirVGenerator::get_standard_type_id");
 392         }
 393         return type_id;
 394 }
 395
 396 bool SpirVGenerator::is_scalar_type(Id type_id, BasicTypeDeclaration::Kind kind) const
 397 {
 398         auto i = standard_type_ids.find(TypeKey(kind, true));
 399         return (i!=standard_type_ids.end() && i->second==type_id);
 400 }
 401
 402 SpirVGenerator::Id SpirVGenerator::get_array_type_id(TypeDeclaration &base_type, Id size_id, bool extended_align)
 403 {
 404         Id base_type_id = get_id(base_type);
 405         Id &array_type_id = array_type_ids[TypeKey(base_type_id, extended_align*0x400000 | size_id)];
 406         if(!array_type_id)
 407         {
 408                 array_type_id = next_id++;
 409                 if(size_id)
 410                         writer.write_op(content.globals, OP_TYPE_ARRAY, array_type_id, base_type_id, size_id);
 411                 else
 412                         writer.write_op(content.globals, OP_TYPE_RUNTIME_ARRAY, array_type_id, base_type_id);
 413
 414                 unsigned stride = MemoryRequirementsCalculator().apply(base_type).stride;
 415                 if(extended_align)
 416                         stride = (stride+15)&~15U;
 417                 writer.write_op_decorate(array_type_id, DECO_ARRAY_STRIDE, stride);
 418         }
 419
 420         return array_type_id;
 421 }
 422
 423 SpirVGenerator::Id SpirVGenerator::get_pointer_type_id(Id type_id, StorageClass storage)
 424 {
 425         Id &ptr_type_id = pointer_type_ids[TypeKey(type_id, storage)];
 426         if(!ptr_type_id)
 427         {
 428                 ptr_type_id = next_id++;
 429                 writer.write_op(content.globals, OP_TYPE_POINTER, ptr_type_id, storage, type_id);
 430         }
 431         return ptr_type_id;
 432 }
 433
 434 SpirVGenerator::Id SpirVGenerator::get_variable_type_id(const VariableDeclaration &var)
 435 {
 436         if(const BasicTypeDeclaration *basic = dynamic_cast<const BasicTypeDeclaration *>(var.type_declaration))
 437                 if(basic->kind==BasicTypeDeclaration::ARRAY)
 438                 {
 439                         if(!var.array_size)
 440                                 throw logic_error("array without size");
 441
 442                         SetFlag set_const(constant_expression);
 443                         r_expression_result_id = 0;
 444                         var.array_size->visit(*this);
 445                         return get_array_type_id(*basic->base_type, r_expression_result_id, basic->extended_alignment);
 446                 }
 447
 448         return get_id(*var.type_declaration);
 449 }
 450
 451 SpirVGenerator::Id SpirVGenerator::get_load_id(VariableDeclaration &var)
 452 {
 453         Id &load_result_id = variable_load_ids[&var];
 454         if(!load_result_id)
 455         {
 456                 load_result_id = next_id++;
 457                 writer.write_op(content.function_body, OP_LOAD, get_variable_type_id(var), load_result_id, get_id(var));
 458         }
 459         return load_result_id;
 460 }
 461
 462 void SpirVGenerator::prune_loads(Id min_id)
 463 {
 464         for(auto i=variable_load_ids.begin(); i!=variable_load_ids.end(); )
 465         {
 466                 if(i->second>=min_id)
 467                         variable_load_ids.erase(i++);
 468                 else
 469                         ++i;
 470         }
 471 }
 472
 473 SpirVGenerator::Id SpirVGenerator::begin_expression(Opcode opcode, Id type_id, unsigned n_args)
 474 {
 475         bool has_result = (opcode==OP_FUNCTION_CALL || !is_scalar_type(type_id, BasicTypeDeclaration::VOID));
 476         if(!constant_expression)
 477         {
 478                 if(!current_function)
 479                         throw internal_error("non-constant expression outside a function");
 480
 481                 writer.begin_op(content.function_body, opcode, (n_args ? 1+has_result*2+n_args : 0));
 482         }
 483         else if(opcode==OP_COMPOSITE_CONSTRUCT)
 484                 writer.begin_op(content.globals, (spec_constant ? OP_SPEC_CONSTANT_COMPOSITE : OP_CONSTANT_COMPOSITE),
 485                         (n_args ? 1+has_result*2+n_args : 0));
 486         else if(!spec_constant)
 487                 throw internal_error("invalid non-specialization constant expression");
 488         else
 489                 writer.begin_op(content.globals, OP_SPEC_CONSTANT_OP, (n_args ? 2+has_result*2+n_args : 0));
 490
 491         Id result_id = next_id++;
 492         if(has_result)
 493         {
 494                 writer.write(type_id);
 495                 writer.write(result_id);
 496         }
 497         if(spec_constant && opcode!=OP_COMPOSITE_CONSTRUCT)
 498                 writer.write(opcode);
 499
 500         return result_id;
 501 }
 502
 503 void SpirVGenerator::end_expression(Opcode opcode)
 504 {
 505         if(constant_expression)
 506                 opcode = (opcode==OP_COMPOSITE_CONSTRUCT ? spec_constant ? OP_SPEC_CONSTANT_COMPOSITE : OP_CONSTANT_COMPOSITE : OP_SPEC_CONSTANT_OP);
 507         writer.end_op(opcode);
 508 }
 509
 510 SpirVGenerator::Id SpirVGenerator::write_expression(Opcode opcode, Id type_id, Id arg_id)
 511 {
 512         Id result_id = begin_expression(opcode, type_id, 1);
 513         writer.write(arg_id);
 514         end_expression(opcode);
 515         return result_id;
 516 }
 517
 518 SpirVGenerator::Id SpirVGenerator::write_expression(Opcode opcode, Id type_id, Id left_id, Id right_id)
 519 {
 520         Id result_id = begin_expression(opcode, type_id, 2);
 521         writer.write(left_id);
 522         writer.write(right_id);
 523         end_expression(opcode);
 524         return result_id;
 525 }
 526
 527 void SpirVGenerator::write_deconstruct(Id elem_type_id, Id composite_id, Id *elem_ids, unsigned n_elems)
 528 {
 529         for(unsigned i=0; i<n_elems; ++i)
 530         {
 531                 elem_ids[i] = begin_expression(OP_COMPOSITE_EXTRACT, elem_type_id, 2);
 532                 writer.write(composite_id);
 533                 writer.write(i);
 534                 end_expression(OP_COMPOSITE_EXTRACT);
 535         }
 536 }
 537
 538 SpirVGenerator::Id SpirVGenerator::write_construct(Id type_id, const Id *elem_ids, unsigned n_elems)
 539 {
 540         Id result_id = begin_expression(OP_COMPOSITE_CONSTRUCT, type_id, n_elems);
 541         for(unsigned i=0; i<n_elems; ++i)
 542                 writer.write(elem_ids[i]);
 543         end_expression(OP_COMPOSITE_CONSTRUCT);
 544
 545         return result_id;
 546 }
 547
 548 void SpirVGenerator::visit(Block &block)
 549 {
 550         for(const RefPtr<Statement> &s: block.body)
 551                 s->visit(*this);
 552 }
 553
 554 void SpirVGenerator::visit(Literal &literal)
 555 {
 556         Id type_id = get_id(*literal.type);
 557         if(spec_constant)
 558                 r_expression_result_id = write_constant(type_id, get_constant_key(type_id, literal.value).int_value, true);
 559         else
 560                 r_expression_result_id = get_constant_id(type_id, literal.value);
 561         r_constant_result = true;
 562 }
 563
 564 void SpirVGenerator::visit(VariableReference &var)
 565 {
 566         if(constant_expression || var.declaration->constant)
 567         {
 568                 if(!var.declaration->constant)
 569                         throw internal_error("reference to non-constant variable in constant context");
 570
 571                 r_expression_result_id = get_id(*var.declaration);
 572                 r_constant_result = true;
 573                 return;
 574         }
 575         else if(!current_function)
 576                 throw internal_error("non-constant context outside a function");
 577
 578         r_constant_result = false;
 579         if(composite_access)
 580         {
 581                 r_expression_result_id = 0;
 582                 if(!assignment_source_id)
 583                 {
 584                         auto i = variable_load_ids.find(var.declaration);
 585                         if(i!=variable_load_ids.end())
 586                                 r_expression_result_id = i->second;
 587                 }
 588                 if(!r_expression_result_id)
 589                         r_composite_base = var.declaration;
 590         }
 591         else if(assignment_source_id)
 592         {
 593                 writer.write_op(content.function_body, OP_STORE, get_id(*var.declaration), assignment_source_id);
 594                 variable_load_ids[var.declaration] = assignment_source_id;
 595                 r_expression_result_id = assignment_source_id;
 596         }
 597         else
 598                 r_expression_result_id = get_load_id(*var.declaration);
 599 }
 600
 601 void SpirVGenerator::generate_composite_access(TypeDeclaration &result_type)
 602 {
 603         Opcode opcode;
 604         Id result_type_id = get_id(result_type);
 605         Id access_type_id = result_type_id;
 606         if(r_composite_base)
 607         {
 608                 if(constant_expression)
 609                         throw internal_error("composite access through pointer in constant context");
 610
 611                 Id int32_type_id = get_standard_type_id(BasicTypeDeclaration::INT, 1);
 612                 for(unsigned &i: r_composite_chain)
 613                         i = (i<0x400000 ? get_constant_id(int32_type_id, static_cast<int>(i)) : i&0x3FFFFF);
 614
 615                 /* Find the storage class of the base and obtain appropriate pointer type
 616                 for the result. */
 617                 const Declaration &base_decl = get_item(declared_ids, r_composite_base);
 618                 auto i = pointer_type_ids.begin();
 619                 for(; (i!=pointer_type_ids.end() && i->second!=base_decl.type_id); ++i) ;
 620                 if(i==pointer_type_ids.end())
 621                         throw internal_error("could not find storage class");
 622                 access_type_id = get_pointer_type_id(result_type_id, static_cast<StorageClass>(i->first.detail));
 623
 624                 opcode = OP_ACCESS_CHAIN;
 625         }
 626         else if(assignment_source_id)
 627                 throw internal_error("assignment to temporary composite");
 628         else
 629         {
 630                 for(unsigned &i: r_composite_chain)
 631                         for(auto j=constant_ids.begin(); (i>=0x400000 && j!=constant_ids.end()); ++j)
 632                                 if(j->second==(i&0x3FFFFF))
 633                                         i = j->first.int_value;
 634
 635                 opcode = OP_COMPOSITE_EXTRACT;
 636         }
 637
 638         Id access_id = begin_expression(opcode, access_type_id, 1+r_composite_chain.size());
 639         writer.write(r_composite_base_id);
 640         for(unsigned i: r_composite_chain)
 641                 writer.write(i);
 642         end_expression(opcode);
 643
 644         r_constant_result = false;
 645         if(r_composite_base)
 646         {
 647                 if(assignment_source_id)
 648                 {
 649                         writer.write_op(content.function_body, OP_STORE, access_id, assignment_source_id);
 650                         r_expression_result_id = assignment_source_id;
 651                 }
 652                 else
 653                         r_expression_result_id = write_expression(OP_LOAD, result_type_id, access_id);
 654         }
 655         else
 656                 r_expression_result_id = access_id;
 657 }
 658
 659 void SpirVGenerator::visit_composite(Expression &base_expr, unsigned index, TypeDeclaration &type)
 660 {
 661         if(!composite_access)
 662         {
 663                 r_composite_base = 0;
 664                 r_composite_base_id = 0;
 665                 r_composite_chain.clear();
 666         }
 667
 668         {
 669                 SetFlag set_composite(composite_access);
 670                 base_expr.visit(*this);
 671         }
 672
 673         if(!r_composite_base_id)
 674                 r_composite_base_id = (r_composite_base ? get_id(*r_composite_base) : r_expression_result_id);
 675
 676         r_composite_chain.push_back(index);
 677         if(!composite_access)
 678                 generate_composite_access(type);
 679         else
 680                 r_expression_result_id = 0;
 681 }
 682
 683 void SpirVGenerator::visit_isolated(Expression &expr)
 684 {
 685         SetForScope<Id> clear_assign(assignment_source_id, 0);
 686         SetFlag clear_composite(composite_access, false);
 687         SetForScope<Node *> clear_base(r_composite_base, 0);
 688         SetForScope<Id> clear_base_id(r_composite_base_id, 0);
 689         vector<unsigned> saved_chain;
 690         swap(saved_chain, r_composite_chain);
 691         expr.visit(*this);
 692         swap(saved_chain, r_composite_chain);
 693 }
 694
 695 void SpirVGenerator::visit(MemberAccess &memacc)
 696 {
 697         visit_composite(*memacc.left, memacc.index, *memacc.type);
 698 }
 699
 700 void SpirVGenerator::visit(Swizzle &swizzle)
 701 {
 702         if(swizzle.count==1)
 703                 visit_composite(*swizzle.left, swizzle.components[0], *swizzle.type);
 704         else if(assignment_source_id)
 705         {
 706                 const BasicTypeDeclaration &basic = dynamic_cast<const BasicTypeDeclaration &>(*swizzle.left->type);
 707
 708                 unsigned mask = 0;
 709                 for(unsigned i=0; i<swizzle.count; ++i)
 710                         mask |= 1<<swizzle.components[i];
 711
 712                 visit_isolated(*swizzle.left);
 713
 714                 Id combined_id = begin_expression(OP_VECTOR_SHUFFLE, get_id(*swizzle.left->type), 2+basic.size);
 715                 writer.write(r_expression_result_id);
 716                 writer.write(assignment_source_id);
 717                 for(unsigned i=0; i<basic.size; ++i)
 718                         writer.write(i+((mask>>i)&1)*basic.size);
 719                 end_expression(OP_VECTOR_SHUFFLE);
 720
 721                 SetForScope<Id> set_assign(assignment_source_id, combined_id);
 722                 swizzle.left->visit(*this);
 723
 724                 r_expression_result_id = combined_id;
 725         }
 726         else
 727         {
 728                 swizzle.left->visit(*this);
 729                 Id left_id = r_expression_result_id;
 730
 731                 r_expression_result_id = begin_expression(OP_VECTOR_SHUFFLE, get_id(*swizzle.type), 2+swizzle.count);
 732                 writer.write(left_id);
 733                 writer.write(left_id);
 734                 for(unsigned i=0; i<swizzle.count; ++i)
 735                         writer.write(swizzle.components[i]);
 736                 end_expression(OP_VECTOR_SHUFFLE);
 737         }
 738         r_constant_result = false;
 739 }
 740
 741 void SpirVGenerator::visit(UnaryExpression &unary)
 742 {
 743         if(composite_access)
 744                 return visit_isolated(unary);
 745
 746         unary.expression->visit(*this);
 747
 748         char oper = unary.oper->token[0];
 749         char oper2 = unary.oper->token[1];
 750         if(oper=='+' && !oper2)
 751                 return;
 752
 753         BasicTypeDeclaration &basic = dynamic_cast<BasicTypeDeclaration &>(*unary.expression->type);
 754         BasicTypeDeclaration &elem = *get_element_type(basic);
 755
 756         if(constant_expression && elem.kind!=BasicTypeDeclaration::BOOL && elem.kind!=BasicTypeDeclaration::INT)
 757                 /* SPIR-V allows constant operations on floating-point values only for
 758                 OpenGL kernels. */
 759                 throw internal_error("invalid operands for constant unary expression");
 760
 761         Id result_type_id = get_id(*unary.type);
 762         Opcode opcode = OP_NOP;
 763
 764         r_constant_result = false;
 765         if(oper=='!')
 766                 opcode = OP_LOGICAL_NOT;
 767         else if(oper=='~')
 768                 opcode = OP_NOT;
 769         else if(oper=='-' && !oper2)
 770         {
 771                 opcode = (elem.kind==BasicTypeDeclaration::INT ? OP_S_NEGATE : OP_F_NEGATE);
 772
 773                 if(basic.kind==BasicTypeDeclaration::MATRIX)
 774                 {
 775                         Id column_type_id = get_id(*basic.base_type);
 776                         unsigned n_columns = basic.size&0xFFFF;
 777                         Id column_ids[4];
 778                         write_deconstruct(column_type_id, r_expression_result_id, column_ids, n_columns);
 779                         for(unsigned i=0; i<n_columns; ++i)
 780                                 column_ids[i] = write_expression(opcode, column_type_id, column_ids[i]);
 781                         r_expression_result_id = write_construct(result_type_id, column_ids, n_columns);
 782                         return;
 783                 }
 784         }
 785         else if((oper=='+' || oper=='-') && oper2==oper)
 786         {
 787                 if(constant_expression)
 788                         throw internal_error("increment or decrement in constant expression");
 789
 790                 Id one_id = 0;
 791                 if(elem.kind==BasicTypeDeclaration::INT)
 792                 {
 793                         opcode = (oper=='+' ? OP_I_ADD : OP_I_SUB);
 794                         one_id = get_constant_id(get_id(elem), 1);
 795                 }
 796                 else if(elem.kind==BasicTypeDeclaration::FLOAT)
 797                 {
 798                         opcode = (oper=='+' ? OP_F_ADD : OP_F_SUB);
 799                         one_id = get_constant_id(get_id(elem), 1.0f);
 800                 }
 801                 else
 802                         throw internal_error("invalid increment/decrement");
 803
 804                 if(basic.kind==BasicTypeDeclaration::VECTOR)
 805                         one_id = get_vector_constant_id(result_type_id, basic.size, one_id);
 806
 807                 Id post_value_id = write_expression(opcode, result_type_id, r_expression_result_id, one_id);
 808
 809                 SetForScope<Id> set_assign(assignment_source_id, post_value_id);
 810                 unary.expression->visit(*this);
 811
 812                 r_expression_result_id = (unary.oper->type==Operator::POSTFIX ? r_expression_result_id : post_value_id);
 813                 return;
 814         }
 815
 816         if(opcode==OP_NOP)
 817                 throw internal_error("unknown unary operator");
 818
 819         r_expression_result_id = write_expression(opcode, result_type_id, r_expression_result_id);
 820 }
 821
 822 void SpirVGenerator::visit(BinaryExpression &binary)
 823 {
 824         char oper = binary.oper->token[0];
 825         if(oper=='[')
 826         {
 827                 visit_isolated(*binary.right);
 828                 return visit_composite(*binary.left, 0x400000|r_expression_result_id, *binary.type);
 829         }
 830         else if(composite_access)
 831                 return visit_isolated(binary);
 832
 833         if(assignment_source_id)
 834                 throw internal_error("invalid binary expression in assignment target");
 835
 836         BasicTypeDeclaration &basic_left = dynamic_cast<BasicTypeDeclaration &>(*binary.left->type);
 837         BasicTypeDeclaration &basic_right = dynamic_cast<BasicTypeDeclaration &>(*binary.right->type);
 838         // Expression resolver ensures that element types are the same
 839         BasicTypeDeclaration &elem = *get_element_type(basic_left);
 840
 841         if(constant_expression && elem.kind!=BasicTypeDeclaration::BOOL && elem.kind!=BasicTypeDeclaration::INT)
 842                 /* SPIR-V allows constant operations on floating-point values only for
 843                 OpenGL kernels. */
 844                 throw internal_error("invalid operands for constant binary expression");
 845
 846         binary.left->visit(*this);
 847         Id left_id = r_expression_result_id;
 848         binary.right->visit(*this);
 849         Id right_id = r_expression_result_id;
 850
 851         Id result_type_id = get_id(*binary.type);
 852         Opcode opcode = OP_NOP;
 853         bool swap_operands = false;
 854
 855         r_constant_result = false;
 856
 857         char oper2 = binary.oper->token[1];
 858         if((oper=='<' || oper=='>') && oper2!=oper)
 859         {
 860                 if(basic_left.kind==BasicTypeDeclaration::INT)
 861                 {
 862                         if(basic_left.sign)
 863                                 opcode = (oper=='<' ? (oper2=='=' ? OP_S_LESS_THAN_EQUAL : OP_S_LESS_THAN) :
 864                                         (oper2=='=' ? OP_S_GREATER_THAN_EQUAL : OP_S_GREATER_THAN));
 865                         else
 866                                 opcode = (oper=='<' ? (oper2=='=' ? OP_U_LESS_THAN_EQUAL : OP_U_LESS_THAN) :
 867                                         (oper2=='=' ? OP_U_GREATER_THAN_EQUAL : OP_U_GREATER_THAN));
 868                 }
 869                 else if(basic_left.kind==BasicTypeDeclaration::FLOAT)
 870                         opcode = (oper=='<' ? (oper2=='=' ? OP_F_ORD_LESS_THAN_EQUAL : OP_F_ORD_LESS_THAN) :
 871                                 (oper2=='=' ? OP_F_ORD_GREATER_THAN_EQUAL : OP_F_ORD_GREATER_THAN));
 872         }
 873         else if((oper=='=' || oper=='!') && oper2=='=')
 874         {
 875                 if(elem.kind==BasicTypeDeclaration::BOOL)
 876                         opcode = (oper=='=' ? OP_LOGICAL_EQUAL : OP_LOGICAL_NOT_EQUAL);
 877                 else if(elem.kind==BasicTypeDeclaration::INT)
 878                         opcode = (oper=='=' ? OP_I_EQUAL : OP_I_NOT_EQUAL);
 879                 else if(elem.kind==BasicTypeDeclaration::FLOAT)
 880                         opcode = (oper=='=' ? OP_F_ORD_EQUAL : OP_F_ORD_NOT_EQUAL);
 881
 882                 if(opcode!=OP_NOP && basic_left.base_type)
 883                 {
 884                         /* The SPIR-V equality operations produce component-wise results, but
 885                         GLSL operators return a single boolean.  Use the any/all operations to
 886                         combine the results. */
 887                         Opcode combine_op = (oper=='!' ? OP_ANY : OP_ALL);
 888                         unsigned n_elems = basic_left.size&0xFFFF;
 889                         Id bool_vec_type_id = get_standard_type_id(BasicTypeDeclaration::BOOL, n_elems);
 890
 891                         Id compare_id = 0;
 892                         if(basic_left.kind==BasicTypeDeclaration::VECTOR)
 893                                 compare_id = write_expression(opcode, bool_vec_type_id, left_id, right_id);
 894                         else if(basic_left.kind==BasicTypeDeclaration::MATRIX)
 895                         {
 896                                 Id column_type_id = get_id(*basic_left.base_type);
 897                                 Id column_ids[8];
 898                                 write_deconstruct(column_type_id, left_id, column_ids, n_elems);
 899                                 write_deconstruct(column_type_id, right_id, column_ids+4, n_elems);
 900
 901                                 Id column_bvec_type_id = get_standard_type_id(BasicTypeDeclaration::BOOL, basic_left.size>>16);
 902                                 for(unsigned i=0; i<n_elems; ++i)
 903                                 {
 904                                         compare_id = write_expression(opcode, column_bvec_type_id, column_ids[i], column_ids[4+i]);
 905                                         column_ids[i] = write_expression(combine_op, result_type_id, compare_id);;
 906                                 }
 907
 908                                 compare_id = write_construct(bool_vec_type_id, column_ids, n_elems);
 909                         }
 910
 911                         if(compare_id)
 912                                 r_expression_result_id = write_expression(combine_op, result_type_id, compare_id);
 913                         return;
 914                 }
 915         }
 916         else if(oper2=='&' && elem.kind==BasicTypeDeclaration::BOOL)
 917                 opcode = OP_LOGICAL_AND;
 918         else if(oper2=='|' && elem.kind==BasicTypeDeclaration::BOOL)
 919                 opcode = OP_LOGICAL_OR;
 920         else if(oper2=='^' && elem.kind==BasicTypeDeclaration::BOOL)
 921                 opcode = OP_LOGICAL_NOT_EQUAL;
 922         else if(oper=='&' && elem.kind==BasicTypeDeclaration::INT)
 923                 opcode = OP_BITWISE_AND;
 924         else if(oper=='|' && elem.kind==BasicTypeDeclaration::INT)
 925                 opcode = OP_BITWISE_OR;
 926         else if(oper=='^' && elem.kind==BasicTypeDeclaration::INT)
 927                 opcode = OP_BITWISE_XOR;
 928         else if(oper=='<' && oper2==oper && elem.kind==BasicTypeDeclaration::INT)
 929                 opcode = OP_SHIFT_LEFT_LOGICAL;
 930         else if(oper=='>' && oper2==oper && elem.kind==BasicTypeDeclaration::INT)
 931                 opcode = OP_SHIFT_RIGHT_ARITHMETIC;
 932         else if(oper=='%' && elem.kind==BasicTypeDeclaration::INT)
 933                 opcode = (elem.sign ? OP_S_MOD : OP_U_MOD);
 934         else if(oper=='+' || oper=='-' || oper=='*' || oper=='/')
 935         {
 936                 Opcode elem_op = OP_NOP;
 937                 if(elem.kind==BasicTypeDeclaration::INT)
 938                 {
 939                         if(oper=='/')
 940                                 elem_op = (elem.sign ? OP_S_DIV : OP_U_DIV);
 941                         else
 942                                 elem_op = (oper=='+' ? OP_I_ADD : oper=='-' ? OP_I_SUB : OP_I_MUL);
 943                 }
 944                 else if(elem.kind==BasicTypeDeclaration::FLOAT)
 945                         elem_op = (oper=='+' ? OP_F_ADD : oper=='-' ? OP_F_SUB : oper=='*' ? OP_F_MUL : OP_F_DIV);
 946
 947                 if(oper=='*' && (basic_left.base_type || basic_right.base_type) && elem.kind==BasicTypeDeclaration::FLOAT)
 948                 {
 949                         /* Multiplication between floating-point vectors and matrices has
 950                         dedicated operations. */
 951                         if(basic_left.kind==BasicTypeDeclaration::MATRIX && basic_right.kind==BasicTypeDeclaration::MATRIX)
 952                                 opcode = OP_MATRIX_TIMES_MATRIX;
 953                         else if(basic_left.kind==BasicTypeDeclaration::MATRIX || basic_right.kind==BasicTypeDeclaration::MATRIX)
 954                         {
 955                                 if(basic_left.kind==BasicTypeDeclaration::VECTOR)
 956                                         opcode = OP_VECTOR_TIMES_MATRIX;
 957                                 else if(basic_right.kind==BasicTypeDeclaration::VECTOR)
 958                                         opcode = OP_MATRIX_TIMES_VECTOR;
 959                                 else
 960                                 {
 961                                         opcode = OP_MATRIX_TIMES_SCALAR;
 962                                         swap_operands = (basic_right.kind==BasicTypeDeclaration::MATRIX);
 963                                 }
 964                         }
 965                         else if(basic_left.kind==BasicTypeDeclaration::VECTOR && basic_right.kind==BasicTypeDeclaration::VECTOR)
 966                                 opcode = elem_op;
 967                         else
 968                         {
 969                                 opcode = OP_VECTOR_TIMES_SCALAR;
 970                                 swap_operands = (basic_right.kind==BasicTypeDeclaration::VECTOR);
 971                         }
 972                 }
 973                 else if((basic_left.base_type!=0)!=(basic_right.base_type!=0))
 974                 {
 975                         /* One operand is scalar and the other is a vector or a matrix.
 976                         Expand the scalar to a vector of appropriate size. */
 977                         Id &scalar_id = (basic_left.base_type ? right_id : left_id);
 978                         BasicTypeDeclaration *vector_type = (basic_left.base_type ? &basic_left : &basic_right);
 979                         if(vector_type->kind==BasicTypeDeclaration::MATRIX)
 980                                 vector_type = dynamic_cast<BasicTypeDeclaration *>(vector_type->base_type);
 981                         Id vector_type_id = get_id(*vector_type);
 982
 983                         Id expanded_id = begin_expression(OP_COMPOSITE_CONSTRUCT, vector_type_id, vector_type->size);
 984                         for(unsigned i=0; i<vector_type->size; ++i)
 985                                 writer.write(scalar_id);
 986                         end_expression(OP_COMPOSITE_CONSTRUCT);
 987
 988                         scalar_id = expanded_id;
 989
 990                         if(basic_left.kind==BasicTypeDeclaration::MATRIX || basic_right.kind==BasicTypeDeclaration::MATRIX)
 991                         {
 992                                 // Apply matrix operation column-wise.
 993                                 Id matrix_id = (basic_left.base_type ? left_id : right_id);
 994
 995                                 Id column_ids[4];
 996                                 unsigned n_columns = (basic_left.base_type ? basic_left.size : basic_right.size)&0xFFFF;
 997                                 write_deconstruct(vector_type_id, matrix_id, column_ids, n_columns);
 998
 999                                 for(unsigned i=0; i<n_columns; ++i)
1000                                         column_ids[i] = write_expression(elem_op, vector_type_id, column_ids[i], expanded_id);
1001
1002                                 r_expression_result_id = write_construct(result_type_id, column_ids, n_columns);
1003                                 return;
1004                         }
1005                         else
1006                                 opcode = elem_op;
1007                 }
1008                 else if(basic_left.kind==BasicTypeDeclaration::MATRIX && basic_right.kind==BasicTypeDeclaration::MATRIX)
1009                 {
1010                         if(oper=='*')
1011                                 throw internal_error("non-float matrix multiplication");
1012
1013                         /* Other operations involving matrices need to be performed
1014                         column-wise. */
1015                         Id column_type_id = get_id(*basic_left.base_type);
1016                         Id column_ids[8];
1017
1018                         unsigned n_columns = basic_left.size&0xFFFF;
1019                         write_deconstruct(column_type_id, left_id, column_ids, n_columns);
1020                         write_deconstruct(column_type_id, right_id, column_ids+4, n_columns);
1021
1022                         for(unsigned i=0; i<n_columns; ++i)
1023                                 column_ids[i] = write_expression(elem_op, column_type_id, column_ids[i], column_ids[4+i]);
1024
1025                         r_expression_result_id = write_construct(result_type_id, column_ids, n_columns);
1026                         return;
1027                 }
1028                 else if(basic_left.kind==basic_right.kind)
1029                         // Both operands are either scalars or vectors.
1030                         opcode = elem_op;
1031         }
1032
1033         if(opcode==OP_NOP)
1034                 throw internal_error("unknown binary operator");
1035
1036         if(swap_operands)
1037                 swap(left_id, right_id);
1038
1039         r_expression_result_id = write_expression(opcode, result_type_id, left_id, right_id);
1040 }
1041
1042 void SpirVGenerator::visit(Assignment &assign)
1043 {
1044         if(assign.oper->token[0]!='=')
1045                 visit(static_cast<BinaryExpression &>(assign));
1046         else
1047                 assign.right->visit(*this);
1048
1049         SetForScope<Id> set_assign(assignment_source_id, r_expression_result_id);
1050         assign.left->visit(*this);
1051         r_constant_result = false;
1052 }
1053
1054 void SpirVGenerator::visit(TernaryExpression &ternary)
1055 {
1056         if(composite_access)
1057                 return visit_isolated(ternary);
1058         if(constant_expression)
1059         {
1060                 ternary.condition->visit(*this);
1061                 Id condition_id = r_expression_result_id;
1062                 ternary.true_expr->visit(*this);
1063                 Id true_result_id = r_expression_result_id;
1064                 ternary.false_expr->visit(*this);
1065                 Id false_result_id = r_expression_result_id;
1066
1067                 r_expression_result_id = begin_expression(OP_SELECT, get_id(*ternary.type), 3);
1068                 writer.write(condition_id);
1069                 writer.write(true_result_id);
1070                 writer.write(false_result_id);
1071                 end_expression(OP_SELECT);
1072
1073                 return;
1074         }
1075
1076         ternary.condition->visit(*this);
1077         Id condition_id = r_expression_result_id;
1078
1079         Id true_label_id = next_id++;
1080         Id false_label_id = next_id++;
1081         Id merge_block_id = next_id++;
1082         writer.write_op(content.function_body, OP_SELECTION_MERGE, merge_block_id, 0);  // Selection control (none)
1083         writer.write_op(content.function_body, OP_BRANCH_CONDITIONAL, condition_id, true_label_id, false_label_id);
1084
1085         std::map<const VariableDeclaration *, Id> saved_load_ids = variable_load_ids;
1086
1087         writer.write_op_label(true_label_id);
1088         ternary.true_expr->visit(*this);
1089         Id true_result_id = r_expression_result_id;
1090         true_label_id = writer.get_current_block();
1091         writer.write_op(content.function_body, OP_BRANCH, merge_block_id);
1092
1093         swap(saved_load_ids, variable_load_ids);
1094         writer.write_op_label(false_label_id);
1095         ternary.false_expr->visit(*this);
1096         Id false_result_id = r_expression_result_id;
1097         false_label_id = writer.get_current_block();
1098
1099         writer.write_op_label(merge_block_id);
1100         prune_loads(true_label_id);
1101         r_expression_result_id = begin_expression(OP_PHI, get_id(*ternary.type), 4);
1102         writer.write(true_result_id);
1103         writer.write(true_label_id);
1104         writer.write(false_result_id);
1105         writer.write(false_label_id);
1106         end_expression(OP_PHI);
1107
1108         r_constant_result = false;
1109 }
1110
1111 void SpirVGenerator::visit(FunctionCall &call)
1112 {
1113         if(assignment_source_id)
1114                 throw internal_error("assignment to function call");
1115         else if(composite_access)
1116                 return visit_isolated(call);
1117         else if(call.constructor && call.arguments.size()==1 && call.arguments[0]->type==call.type)
1118                 return call.arguments[0]->visit(*this);
1119
1120         vector<Id> argument_ids;
1121         argument_ids.reserve(call.arguments.size());
1122         bool all_args_const = true;
1123         for(const RefPtr<Expression> &a: call.arguments)
1124         {
1125                 a->visit(*this);
1126                 argument_ids.push_back(r_expression_result_id);
1127                 all_args_const &= r_constant_result;
1128         }
1129
1130         if(constant_expression && (!call.constructor || !all_args_const))
1131                 throw internal_error("function call in constant expression");
1132
1133         Id result_type_id = get_id(*call.type);
1134         r_constant_result = false;
1135
1136         if(call.constructor)
1137                 visit_constructor(call, argument_ids, all_args_const);
1138         else if(call.declaration->source==BUILTIN_SOURCE)
1139         {
1140                 string arg_types;
1141                 for(const RefPtr<Expression> &a: call.arguments)
1142                         if(BasicTypeDeclaration *basic_arg = dynamic_cast<BasicTypeDeclaration *>(a->type))
1143                         {
1144                                 BasicTypeDeclaration &elem_arg = *get_element_type(*basic_arg);
1145                                 switch(elem_arg.kind)
1146                                 {
1147                                 case BasicTypeDeclaration::BOOL: arg_types += 'b'; break;
1148                                 case BasicTypeDeclaration::INT: arg_types += (elem_arg.sign ? 'i' : 'u'); break;
1149                                 case BasicTypeDeclaration::FLOAT: arg_types += 'f'; break;
1150                                 default: arg_types += '?';
1151                                 }
1152                         }
1153
1154                 const BuiltinFunctionInfo *builtin_info;
1155                 for(builtin_info=builtin_functions; builtin_info->function[0]; ++builtin_info)
1156                         if(builtin_info->function==call.name && (!builtin_info->arg_types[0] || builtin_info->arg_types==arg_types))
1157                                 break;
1158
1159                 if(builtin_info->capability)
1160                         use_capability(static_cast<Capability>(builtin_info->capability));
1161
1162                 if(builtin_info->opcode)
1163                 {
1164                         Opcode opcode;
1165                         if(builtin_info->extension[0])
1166                         {
1167                                 opcode = OP_EXT_INST;
1168                                 Id ext_id = import_extension(builtin_info->extension);
1169
1170                                 r_expression_result_id = begin_expression(opcode, result_type_id);
1171                                 writer.write(ext_id);
1172                                 writer.write(builtin_info->opcode);
1173                         }
1174                         else
1175                         {
1176                                 opcode = static_cast<Opcode>(builtin_info->opcode);
1177                                 r_expression_result_id = begin_expression(opcode, result_type_id);
1178                         }
1179
1180                         for(unsigned i=0; i<call.arguments.size(); ++i)
1181                         {
1182                                 if(!builtin_info->arg_order[i] || builtin_info->arg_order[i]>argument_ids.size())
1183                                         throw internal_error("invalid builtin function info");
1184                                 writer.write(argument_ids[builtin_info->arg_order[i]-1]);
1185                         }
1186
1187                         end_expression(opcode);
1188                 }
1189                 else if(builtin_info->handler)
1190                         (this->*(builtin_info->handler))(call, argument_ids);
1191                 else
1192                         throw internal_error("unknown builtin function "+call.name);
1193         }
1194         else
1195         {
1196                 r_expression_result_id = begin_expression(OP_FUNCTION_CALL, result_type_id, 1+call.arguments.size());
1197                 writer.write(get_id(*call.declaration->definition));
1198                 for(Id i: argument_ids)
1199                         writer.write(i);
1200                 end_expression(OP_FUNCTION_CALL);
1201
1202                 // Any global variables the called function uses might have changed value
1203                 set<Node *> dependencies = DependencyCollector().apply(*call.declaration->definition);
1204                 for(Node *n: dependencies)
1205                         if(const VariableDeclaration *var = dynamic_cast<const VariableDeclaration *>(n))
1206                                 variable_load_ids.erase(var);
1207         }
1208 }
1209
1210 void SpirVGenerator::visit_constructor(FunctionCall &call, const vector<Id> &argument_ids, bool all_args_const)
1211 {
1212         Id result_type_id = get_id(*call.type);
1213
1214         BasicTypeDeclaration *basic = dynamic_cast<BasicTypeDeclaration *>(call.type);
1215         if(!basic)
1216         {
1217                 if(dynamic_cast<const StructDeclaration *>(call.type))
1218                         r_expression_result_id = write_construct(result_type_id, &argument_ids[0], argument_ids.size());
1219                 else
1220                         throw internal_error("unconstructable type "+call.name);
1221                 return;
1222         }
1223
1224         SetFlag set_const(constant_expression, constant_expression || all_args_const);
1225
1226         BasicTypeDeclaration &elem = *get_element_type(*basic);
1227         BasicTypeDeclaration &basic_arg0 = dynamic_cast<BasicTypeDeclaration &>(*call.arguments[0]->type);
1228         BasicTypeDeclaration &elem_arg0 = *get_element_type(basic_arg0);
1229
1230         if(basic->kind==BasicTypeDeclaration::MATRIX)
1231         {
1232                 Id col_type_id = get_id(*basic->base_type);
1233                 unsigned n_columns = basic->size&0xFFFF;
1234                 unsigned n_rows = basic->size>>16;
1235
1236                 Id column_ids[4];
1237                 if(call.arguments.size()==1)
1238                 {
1239                         // Construct diagonal matrix from a single scalar.
1240                         Id zero_id = get_constant_id(get_id(elem), 0.0f);
1241                         for(unsigned i=0; i<n_columns; ++i)
1242                         {
1243                                 column_ids[i] = begin_expression(OP_COMPOSITE_CONSTRUCT, col_type_id, n_rows);
1244                                 for(unsigned j=0; j<n_rows; ++j)
1245                                         writer.write(j==i ? argument_ids[0] : zero_id);
1246                                 end_expression(OP_COMPOSITE_CONSTRUCT);
1247                         }
1248                 }
1249                 else
1250                         // Construct a matrix from column vectors
1251                         copy(argument_ids.begin(), argument_ids.begin()+n_columns, column_ids);
1252
1253                 r_expression_result_id = write_construct(result_type_id, column_ids, n_columns);
1254         }
1255         else if(basic->kind==BasicTypeDeclaration::VECTOR && (call.arguments.size()>1 || basic_arg0.kind!=BasicTypeDeclaration::VECTOR))
1256         {
1257                 /* There's either a single scalar argument or multiple arguments
1258                 which make up the vector's components. */
1259                 if(call.arguments.size()==1)
1260                 {
1261                         r_expression_result_id = begin_expression(OP_COMPOSITE_CONSTRUCT, result_type_id);
1262                         for(unsigned i=0; i<basic->size; ++i)
1263                                 writer.write(argument_ids[0]);
1264                         end_expression(OP_COMPOSITE_CONSTRUCT);
1265                 }
1266                 else
1267                         r_expression_result_id = write_construct(result_type_id, &argument_ids[0], argument_ids.size());
1268         }
1269         else if(elem.kind==BasicTypeDeclaration::BOOL)
1270         {
1271                 if(constant_expression)
1272                         throw internal_error("unconverted constant");
1273
1274                 // Conversion to boolean is implemented as comparing against zero.
1275                 Id number_type_id = get_id(elem_arg0);
1276                 Id zero_id = (elem_arg0.kind==BasicTypeDeclaration::FLOAT ?
1277                         get_constant_id(number_type_id, 0.0f) : get_constant_id(number_type_id, 0));
1278                 if(basic_arg0.kind==BasicTypeDeclaration::VECTOR)
1279                         zero_id = get_vector_constant_id(get_id(basic_arg0), basic_arg0.size, zero_id);
1280
1281                 Opcode opcode = (elem_arg0.kind==BasicTypeDeclaration::FLOAT ? OP_F_ORD_NOT_EQUAL : OP_I_NOT_EQUAL);
1282                 r_expression_result_id = write_expression(opcode, result_type_id, argument_ids[0], zero_id);
1283         }
1284         else if(elem_arg0.kind==BasicTypeDeclaration::BOOL)
1285         {
1286                 if(constant_expression)
1287                         throw internal_error("unconverted constant");
1288
1289                 /* Conversion from boolean is implemented as selecting from zero
1290                 or one. */
1291                 Id number_type_id = get_id(elem);
1292                 Id zero_id = (elem.kind==BasicTypeDeclaration::FLOAT ?
1293                         get_constant_id(number_type_id, 0.0f) : get_constant_id(number_type_id, 0));
1294                 Id one_id = (elem.kind==BasicTypeDeclaration::FLOAT ?
1295                         get_constant_id(number_type_id, 1.0f) : get_constant_id(number_type_id, 1));
1296                 if(basic->kind==BasicTypeDeclaration::VECTOR)
1297                 {
1298                         zero_id = get_vector_constant_id(get_id(*basic), basic->size, zero_id);
1299                         one_id = get_vector_constant_id(get_id(*basic), basic->size, one_id);
1300                 }
1301
1302                 r_expression_result_id = begin_expression(OP_SELECT, result_type_id, 3);
1303                 writer.write(argument_ids[0]);
1304                 writer.write(zero_id);
1305                 writer.write(one_id);
1306                 end_expression(OP_SELECT);
1307         }
1308         else
1309         {
1310                 if(constant_expression)
1311                         throw internal_error("unconverted constant");
1312
1313                 // Scalar or vector conversion between types of equal size.
1314                 Opcode opcode;
1315                 if(elem.kind==BasicTypeDeclaration::INT && elem_arg0.kind==BasicTypeDeclaration::FLOAT)
1316                         opcode = (elem.sign ? OP_CONVERT_F_TO_S : OP_CONVERT_F_TO_U);
1317                 else if(elem.kind==BasicTypeDeclaration::FLOAT && elem_arg0.kind==BasicTypeDeclaration::INT)
1318                         opcode = (elem_arg0.sign ? OP_CONVERT_S_TO_F : OP_CONVERT_U_TO_F);
1319                 else if(elem.kind==BasicTypeDeclaration::INT && elem_arg0.kind==BasicTypeDeclaration::INT)
1320                         opcode = OP_BITCAST;
1321                 else
1322                         throw internal_error("invalid conversion");
1323
1324                 r_expression_result_id = write_expression(opcode, result_type_id, argument_ids[0]);
1325         }
1326 }
1327
1328 void SpirVGenerator::visit_builtin_matrix_comp_mult(FunctionCall &call, const vector<Id> &argument_ids)
1329 {
1330         if(argument_ids.size()!=2)
1331                 throw internal_error("invalid matrixCompMult call");
1332
1333         const BasicTypeDeclaration &basic_arg0 = dynamic_cast<const BasicTypeDeclaration &>(*call.arguments[0]->type);
1334         Id column_type_id = get_id(*basic_arg0.base_type);
1335         Id column_ids[8];
1336
1337         unsigned n_columns = basic_arg0.size&0xFFFF;
1338         write_deconstruct(column_type_id, argument_ids[0], column_ids, n_columns);
1339         write_deconstruct(column_type_id, argument_ids[1], column_ids+4, n_columns);
1340
1341         for(unsigned i=0; i<n_columns; ++i)
1342                 column_ids[i] = write_expression(OP_F_MUL, column_type_id, column_ids[i], column_ids[4+i]);
1343
1344         r_expression_result_id = write_construct(get_id(*call.type), column_ids, n_columns);
1345 }
1346
1347 void SpirVGenerator::visit_builtin_texture_query(FunctionCall &call, const vector<Id> &argument_ids)
1348 {
1349         if(argument_ids.size()<1)
1350                 throw internal_error("invalid texture query call");
1351
1352         Opcode opcode;
1353         if(call.name=="textureSize")
1354                 opcode = OP_IMAGE_QUERY_SIZE_LOD;
1355         else if(call.name=="imageSize")
1356                 opcode = OP_IMAGE_QUERY_SIZE;
1357         else if(call.name=="textureQueryLod")
1358                 opcode = OP_IMAGE_QUERY_LOD;
1359         else if(call.name=="textureQueryLevels")
1360                 opcode = OP_IMAGE_QUERY_LEVELS;
1361         else if(call.name=="textureSamples" || call.name=="imageSamples")
1362                 opcode = OP_IMAGE_QUERY_SAMPLES;
1363         else
1364                 throw internal_error("invalid texture query call");
1365
1366         ImageTypeDeclaration &image_arg0 = dynamic_cast<ImageTypeDeclaration &>(*call.arguments[0]->type);
1367
1368         Id image_id;
1369         if(image_arg0.sampled && opcode!=OP_IMAGE_QUERY_LOD)
1370         {
1371                 Id image_type_id = get_item(image_type_ids, get_id(image_arg0));
1372                 image_id = write_expression(OP_IMAGE, image_type_id, argument_ids[0]);
1373         }
1374         else
1375                 image_id = argument_ids[0];
1376
1377         Id result_type_id = get_id(*call.type);
1378         r_expression_result_id = begin_expression(opcode, result_type_id, argument_ids.size());
1379         writer.write(image_id);
1380         for(unsigned i=1; i<argument_ids.size(); ++i)
1381                 writer.write(argument_ids[i]);
1382         end_expression(opcode);
1383 }
1384
1385 void SpirVGenerator::visit_builtin_texture(FunctionCall &call, const vector<Id> &argument_ids)
1386 {
1387         if(argument_ids.size()<2)
1388                 throw internal_error("invalid texture sampling call");
1389
1390         bool explicit_lod = (stage->type!=Stage::FRAGMENT || call.name=="textureLod");
1391         Id lod_id = (!explicit_lod ? 0 : call.name=="textureLod" ? argument_ids.back() :
1392                 get_constant_id(get_standard_type_id(BasicTypeDeclaration::FLOAT, 1), 0.0f));
1393
1394         const ImageTypeDeclaration &image = dynamic_cast<const ImageTypeDeclaration &>(*call.arguments[0]->type);
1395
1396         Opcode opcode;
1397         Id result_type_id = get_id(*call.type);
1398         Id dref_id = 0;
1399         if(image.shadow)
1400         {
1401                 if(argument_ids.size()==2)
1402                 {
1403                         const BasicTypeDeclaration &basic_arg1 = dynamic_cast<const BasicTypeDeclaration &>(*call.arguments[1]->type);
1404                         dref_id = begin_expression(OP_COMPOSITE_EXTRACT, get_id(*basic_arg1.base_type), 2);
1405                         writer.write(argument_ids.back());
1406                         writer.write(basic_arg1.size-1);
1407                         end_expression(OP_COMPOSITE_EXTRACT);
1408                 }
1409                 else
1410                         dref_id = argument_ids[2];
1411
1412                 opcode = (explicit_lod ? OP_IMAGE_SAMPLE_DREF_EXPLICIT_LOD : OP_IMAGE_SAMPLE_DREF_IMPLICIT_LOD);
1413                 r_expression_result_id = begin_expression(opcode, result_type_id, 3+explicit_lod*2);
1414         }
1415         else
1416         {
1417                 opcode = (explicit_lod ? OP_IMAGE_SAMPLE_EXPLICIT_LOD : OP_IMAGE_SAMPLE_IMPLICIT_LOD);
1418                 r_expression_result_id = begin_expression(opcode, result_type_id, 2+explicit_lod*2);
1419         }
1420
1421         for(unsigned i=0; i<2; ++i)
1422                 writer.write(argument_ids[i]);
1423         if(dref_id)
1424                 writer.write(dref_id);
1425         if(explicit_lod)
1426         {
1427                 writer.write(2);  // Lod
1428                 writer.write(lod_id);
1429         }
1430
1431         end_expression(opcode);
1432 }
1433
1434 void SpirVGenerator::visit_builtin_texture_fetch(FunctionCall &call, const vector<Id> &argument_ids)
1435 {
1436         const ImageTypeDeclaration &image = dynamic_cast<const ImageTypeDeclaration &>(*call.arguments[0]->type);
1437
1438         Opcode opcode;
1439         if(call.name=="texelFetch")
1440                 opcode = OP_IMAGE_FETCH;
1441         else if(call.name=="imageLoad")
1442                 opcode = OP_IMAGE_READ;
1443         else
1444                 throw internal_error("invalid texture fetch call");
1445
1446         bool need_sample = image.multisample;
1447         bool need_lod = (opcode==OP_IMAGE_FETCH && !need_sample);
1448
1449         if(argument_ids.size()!=2U+need_sample+need_lod)
1450                 throw internal_error("invalid texture fetch call");
1451
1452         r_expression_result_id = begin_expression(opcode, get_id(*call.type), 2+(need_lod|need_sample)+need_lod+need_sample);
1453         for(unsigned i=0; i<2; ++i)
1454                 writer.write(argument_ids[i]);
1455         if(need_lod || need_sample)
1456         {
1457                 writer.write(need_lod*0x02 | need_sample*0x40);
1458                 writer.write(argument_ids.back());
1459         }
1460         end_expression(opcode);
1461 }
1462
1463 void SpirVGenerator::visit_builtin_texture_store(FunctionCall &call, const vector<Id> &argument_ids)
1464 {
1465         if(argument_ids.size()!=3)
1466                 throw internal_error("invalid texture store call");
1467
1468         const ImageTypeDeclaration &image = dynamic_cast<const ImageTypeDeclaration &>(*call.arguments[0]->type);
1469
1470         begin_expression(OP_IMAGE_WRITE, get_id(*call.type), 3+image.multisample*2);
1471         for(unsigned i=0; i<2; ++i)
1472                 writer.write(argument_ids[i]);
1473         writer.write(argument_ids.back());
1474         if(image.multisample)
1475         {
1476                 writer.write(0x40);  // Sample
1477                 writer.write(argument_ids[2]);
1478         }
1479         end_expression(OP_IMAGE_WRITE);
1480
1481         r_expression_result_id = 0;
1482 }
1483
1484 void SpirVGenerator::visit_builtin_interpolate(FunctionCall &call, const vector<Id> &argument_ids)
1485 {
1486         if(argument_ids.size()<1)
1487                 throw internal_error("invalid interpolate call");
1488         const VariableReference *var = dynamic_cast<const VariableReference *>(call.arguments[0].get());
1489         if(!var || !var->declaration || var->declaration->interface!="in")
1490                 throw internal_error("invalid interpolate call");
1491
1492         SpirVGlslStd450Opcode opcode;
1493         if(call.name=="interpolateAtCentroid")
1494                 opcode = GLSL450_INTERPOLATE_AT_CENTROID;
1495         else if(call.name=="interpolateAtSample")
1496                 opcode = GLSL450_INTERPOLATE_AT_SAMPLE;
1497         else if(call.name=="interpolateAtOffset")
1498                 opcode = GLSL450_INTERPOLATE_AT_OFFSET;
1499         else
1500                 throw internal_error("invalid interpolate call");
1501
1502         Id ext_id = import_extension("GLSL.std.450");
1503         r_expression_result_id = begin_expression(OP_EXT_INST, get_id(*call.type));
1504         writer.write(ext_id);
1505         writer.write(opcode);
1506         writer.write(get_id(*var->declaration));
1507         for(auto i=argument_ids.begin(); ++i!=argument_ids.end(); )
1508                 writer.write(*i);
1509         end_expression(OP_EXT_INST);
1510 }
1511
1512 void SpirVGenerator::visit(ExpressionStatement &expr)
1513 {
1514         expr.expression->visit(*this);
1515 }
1516
1517 void SpirVGenerator::visit(InterfaceLayout &layout)
1518 {
1519         interface_layouts.push_back(&layout);
1520 }
1521
1522 bool SpirVGenerator::check_duplicate_type(TypeDeclaration &type)
1523 {
1524         for(const auto &kvp: declared_ids)
1525                 if(TypeDeclaration *type2 = dynamic_cast<TypeDeclaration *>(kvp.first))
1526                         if(TypeComparer().apply(type, *type2))
1527                         {
1528                                 insert_unique(declared_ids, &type, kvp.second);
1529                                 return true;
1530                         }
1531
1532         return false;
1533 }
1534
1535 bool SpirVGenerator::check_standard_type(BasicTypeDeclaration &basic)
1536 {
1537         const BasicTypeDeclaration *elem = (basic.kind==BasicTypeDeclaration::VECTOR ?
1538                 dynamic_cast<const BasicTypeDeclaration *>(basic.base_type) : &basic);
1539         if(!elem || elem->base_type)
1540                 return false;
1541         if((elem->kind==BasicTypeDeclaration::INT || elem->kind==BasicTypeDeclaration::FLOAT) && elem->size!=32)
1542                 return false;
1543
1544         Id standard_id = get_standard_type_id(elem->kind, (basic.kind==BasicTypeDeclaration::VECTOR ? basic.size : 1), elem->sign);
1545         insert_unique(declared_ids, &basic, Declaration(standard_id, 0));
1546         writer.write_op_name(standard_id, basic.name);
1547
1548         return true;
1549 }
1550
1551 void SpirVGenerator::visit(BasicTypeDeclaration &basic)
1552 {
1553         if(check_standard_type(basic))
1554                 return;
1555         if(check_duplicate_type(basic))
1556                 return;
1557         // Alias types shouldn't exist at this point and arrays are handled elsewhere
1558         if(basic.kind==BasicTypeDeclaration::ALIAS || basic.kind==BasicTypeDeclaration::ARRAY)
1559                 return;
1560
1561         Id type_id = allocate_id(basic, 0);
1562         writer.write_op_name(type_id, basic.name);
1563
1564         switch(basic.kind)
1565         {
1566         case BasicTypeDeclaration::INT:
1567                 writer.write_op(content.globals, OP_TYPE_INT, type_id, basic.size, basic.sign);
1568                 break;
1569         case BasicTypeDeclaration::FLOAT:
1570                 writer.write_op(content.globals, OP_TYPE_FLOAT, type_id, basic.size);
1571                 break;
1572         case BasicTypeDeclaration::VECTOR:
1573                 writer.write_op(content.globals, OP_TYPE_VECTOR, type_id, get_id(*basic.base_type), basic.size);
1574                 break;
1575         case BasicTypeDeclaration::MATRIX:
1576                 writer.write_op(content.globals, OP_TYPE_MATRIX, type_id, get_id(*basic.base_type), basic.size&0xFFFF);
1577                 break;
1578         default:
1579                 throw internal_error("unknown basic type");
1580         }
1581 }
1582
1583 void SpirVGenerator::visit(ImageTypeDeclaration &image)
1584 {
1585         if(check_duplicate_type(image))
1586                 return;
1587
1588         Id type_id = allocate_id(image, 0);
1589
1590         Id image_id = (image.sampled ? next_id++ : type_id);
1591         writer.begin_op(content.globals, OP_TYPE_IMAGE, 9);
1592         writer.write(image_id);
1593         writer.write(get_id(*image.base_type));
1594         writer.write(image.dimensions-1);
1595         writer.write(image.shadow);
1596         writer.write(image.array);
1597         writer.write(image.multisample);
1598         writer.write(image.sampled ? 1 : 2);
1599         writer.write(get_format(image.format));
1600         writer.end_op(OP_TYPE_IMAGE);
1601
1602         if(image.sampled)
1603         {
1604                 writer.write_op_name(type_id, image.name);
1605                 writer.write_op(content.globals, OP_TYPE_SAMPLED_IMAGE, type_id, image_id);
1606                 insert_unique(image_type_ids, type_id, image_id);
1607         }
1608
1609         if(image.dimensions==ImageTypeDeclaration::ONE)
1610                 use_capability(image.sampled ? CAP_SAMPLED_1D : CAP_IMAGE_1D);
1611         else if(image.dimensions==ImageTypeDeclaration::CUBE && image.array)
1612                 use_capability(image.sampled ? CAP_SAMPLED_CUBE_ARRAY : CAP_IMAGE_CUBE_ARRAY);
1613
1614         if(image.multisample && !image.sampled)
1615                 use_capability(CAP_STORAGE_IMAGE_MULTISAMPLE);
1616 }
1617
1618 void SpirVGenerator::visit(StructDeclaration &strct)
1619 {
1620         if(check_duplicate_type(strct))
1621                 return;
1622
1623         Id type_id = allocate_id(strct, 0);
1624         writer.write_op_name(type_id, (strct.block_name.empty() ? strct.name : strct.block_name));
1625
1626         if(!strct.block_name.empty())
1627                 writer.write_op_decorate(type_id, DECO_BLOCK);
1628
1629         bool builtin = !strct.block_name.compare(0, 3, "gl_");
1630         vector<Id> member_type_ids;
1631         member_type_ids.reserve(strct.members.body.size());
1632         for(const RefPtr<Statement> &s: strct.members.body)
1633         {
1634                 const VariableDeclaration *var = dynamic_cast<const VariableDeclaration *>(s.get());
1635                 if(!var)
1636                         continue;
1637
1638                 unsigned index = member_type_ids.size();
1639                 member_type_ids.push_back(get_variable_type_id(*var));
1640
1641                 writer.write_op_member_name(type_id, index, var->name);
1642
1643                 if(builtin)
1644                 {
1645                         BuiltinSemantic semantic = get_builtin_semantic(var->name);
1646                         writer.write_op_member_decorate(type_id, index, DECO_BUILTIN, semantic);
1647                 }
1648                 else
1649                 {
1650                         if(var->layout)
1651                         {
1652                                 for(const Layout::Qualifier &q: var->layout->qualifiers)
1653                                 {
1654                                         if(q.name=="offset")
1655                                                 writer.write_op_member_decorate(type_id, index, DECO_OFFSET, q.value);
1656                                         else if(q.name=="column_major")
1657                                                 writer.write_op_member_decorate(type_id, index, DECO_COL_MAJOR);
1658                                         else if(q.name=="row_major")
1659                                                 writer.write_op_member_decorate(type_id, index, DECO_ROW_MAJOR);
1660                                 }
1661                         }
1662
1663                         const BasicTypeDeclaration *basic = dynamic_cast<const BasicTypeDeclaration *>(var->type_declaration);
1664                         while(basic && basic->kind==BasicTypeDeclaration::ARRAY)
1665                                 basic = dynamic_cast<const BasicTypeDeclaration *>(basic->base_type);
1666                         if(basic && basic->kind==BasicTypeDeclaration::MATRIX)
1667                         {
1668                                 unsigned stride = MemoryRequirementsCalculator().apply(*basic->base_type).stride;
1669                                 writer.write_op_member_decorate(type_id, index, DECO_MATRIX_STRIDE, stride);
1670                         }
1671                 }
1672         }
1673
1674         writer.begin_op(content.globals, OP_TYPE_STRUCT);
1675         writer.write(type_id);
1676         for(Id i: member_type_ids)
1677                 writer.write(i);
1678         writer.end_op(OP_TYPE_STRUCT);
1679 }
1680
1681 void SpirVGenerator::visit(VariableDeclaration &var)
1682 {
1683         Id type_id = get_variable_type_id(var);
1684         Id var_id;
1685
1686         if(var.constant)
1687         {
1688                 if(!var.init_expression)
1689                         throw internal_error("const variable without initializer");
1690
1691                 int spec_id = get_layout_value(var.layout.get(), "constant_id");
1692                 Id *spec_var_id = (spec_id>=0 ? &declared_spec_ids[spec_id] : 0);
1693                 if(spec_id>=0 && *spec_var_id)
1694                 {
1695                         insert_unique(declared_ids, &var, Declaration(*spec_var_id, type_id));
1696                         return;
1697                 }
1698
1699                 SetFlag set_const(constant_expression);
1700                 SetFlag set_spec(spec_constant, spec_id>=0);
1701                 r_expression_result_id = 0;
1702                 var.init_expression->visit(*this);
1703                 var_id = r_expression_result_id;
1704                 insert_unique(declared_ids, &var, Declaration(var_id, type_id));
1705                 if(spec_id>=0)
1706                 {
1707                         writer.write_op_decorate(var_id, DECO_SPEC_ID, spec_id);
1708                         *spec_var_id = var_id;
1709                 }
1710         }
1711         else
1712         {
1713                 bool push_const = has_layout_qualifier(var.layout.get(), "push_constant");
1714
1715                 StorageClass storage;
1716                 if(current_function)
1717                         storage = STORAGE_FUNCTION;
1718                 else if(push_const)
1719                         storage = STORAGE_PUSH_CONSTANT;
1720                 else
1721                         storage = get_interface_storage(var.interface, var.block_declaration);
1722
1723                 Id ptr_type_id = get_pointer_type_id(type_id, storage);
1724                 if(var.interface=="uniform")
1725                 {
1726                         Id &uni_id = declared_uniform_ids[var.block_declaration ? "b"+var.block_declaration->block_name : "v"+var.name];
1727                         if(uni_id)
1728                         {
1729                                 insert_unique(declared_ids, &var, Declaration(uni_id, ptr_type_id));
1730                                 return;
1731                         }
1732
1733                         uni_id = var_id = allocate_id(var, ptr_type_id);
1734                 }
1735                 else
1736                         var_id = allocate_id(var, (var.constant ? type_id : ptr_type_id));
1737
1738                 Id init_id = 0;
1739                 if(var.init_expression)
1740                 {
1741                         SetFlag set_const(constant_expression, !current_function);
1742                         r_expression_result_id = 0;
1743                         r_constant_result = false;
1744                         var.init_expression->visit(*this);
1745                         init_id = r_expression_result_id;
1746                 }
1747
1748                 vector<Word> &target = (current_function ? content.locals : content.globals);
1749                 writer.begin_op(target, OP_VARIABLE, 4+(init_id && !current_function));
1750                 writer.write(ptr_type_id);
1751                 writer.write(var_id);
1752                 writer.write(storage);
1753                 if(init_id && !current_function)
1754                         writer.write(init_id);
1755                 writer.end_op(OP_VARIABLE);
1756
1757                 if(var.layout)
1758                 {
1759                         for(const Layout::Qualifier &q: var.layout->qualifiers)
1760                         {
1761                                 if(q.name=="location")
1762                                         writer.write_op_decorate(var_id, DECO_LOCATION, q.value);
1763                                 else if(q.name=="set")
1764                                         writer.write_op_decorate(var_id, DECO_DESCRIPTOR_SET, q.value);
1765                                 else if(q.name=="binding")
1766                                         writer.write_op_decorate(var_id, DECO_BINDING, q.value);
1767                         }
1768                 }
1769                 if(!var.block_declaration && !var.name.compare(0, 3, "gl_"))
1770                 {
1771                         BuiltinSemantic semantic = get_builtin_semantic(var.name);
1772                         writer.write_op_decorate(var_id, DECO_BUILTIN, semantic);
1773                 }
1774                 if(var.sampling=="flat")
1775                         writer.write_op_decorate(var_id, DECO_FLAT);
1776                 if(var.sampling=="centroid")
1777                         writer.write_op_decorate(var_id, DECO_CENTROID);
1778
1779                 if(init_id && current_function)
1780                 {
1781                         writer.write_op(content.function_body, OP_STORE, var_id, init_id);
1782                         variable_load_ids[&var] = init_id;
1783                 }
1784         }
1785
1786         if(var.name.find(' ')==string::npos)
1787                 writer.write_op_name(var_id, var.name);
1788 }
1789
1790 void SpirVGenerator::visit_entry_point(FunctionDeclaration &func, Id func_id)
1791 {
1792         writer.begin_op(content.entry_points, OP_ENTRY_POINT);
1793         switch(stage->type)
1794         {
1795         case Stage::VERTEX: writer.write(0); break;
1796         case Stage::GEOMETRY: writer.write(3); break;
1797         case Stage::FRAGMENT: writer.write(4); break;
1798         case Stage::COMPUTE: writer.write(5); break;
1799         default: throw internal_error("unknown stage");
1800         }
1801         writer.write(func_id);
1802         writer.write_string(func.name);
1803
1804         set<Node *> dependencies = DependencyCollector().apply(func);
1805         for(Node *n: dependencies)
1806                 if(const VariableDeclaration *var = dynamic_cast<const VariableDeclaration *>(n))
1807                         if(!var->interface.empty())
1808                                 writer.write(get_id(*n));
1809
1810         writer.end_op(OP_ENTRY_POINT);
1811
1812         if(stage->type==Stage::FRAGMENT)
1813         {
1814                 SpirVExecutionMode origin = (features.target_api==VULKAN ? EXEC_ORIGIN_UPPER_LEFT : EXEC_ORIGIN_LOWER_LEFT);
1815                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, origin);
1816         }
1817         else if(stage->type==Stage::GEOMETRY)
1818         {
1819                 use_capability(CAP_GEOMETRY);
1820                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_INVOCATIONS, 1);
1821         }
1822
1823         unsigned local_size[3] = { 0, 1, 1 };
1824
1825         for(const InterfaceLayout *i: interface_layouts)
1826         {
1827                 for(const Layout::Qualifier &q: i->layout.qualifiers)
1828                 {
1829                         if(q.name=="point")
1830                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id,
1831                                         (i->interface=="in" ? EXEC_INPUT_POINTS : EXEC_OUTPUT_POINTS));
1832                         else if(q.name=="lines")
1833                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_INPUT_LINES);
1834                         else if(q.name=="lines_adjacency")
1835                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_INPUT_LINES_ADJACENCY);
1836                         else if(q.name=="triangles")
1837                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_TRIANGLES);
1838                         else if(q.name=="triangles_adjacency")
1839                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_INPUT_TRIANGLES_ADJACENCY);
1840                         else if(q.name=="line_strip")
1841                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_OUTPUT_LINE_STRIP);
1842                         else if(q.name=="triangle_strip")
1843                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_OUTPUT_TRIANGLE_STRIP);
1844                         else if(q.name=="max_vertices")
1845                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_OUTPUT_VERTICES, q.value);
1846                         else if(q.name=="local_size_x")
1847                                 local_size[0] = q.value;
1848                         else if(q.name=="local_size_y")
1849                                 local_size[1] = q.value;
1850                         else if(q.name=="local_size_z")
1851                                 local_size[2] = q.value;
1852                 }
1853         }
1854
1855         if(stage->type==Stage::COMPUTE && local_size[0])
1856         {
1857                 writer.begin_op(content.exec_modes, OP_EXECUTION_MODE);
1858                 writer.write(func_id);
1859                 writer.write(EXEC_LOCAL_SIZE);
1860                 for(unsigned j=0; j<3; ++j)
1861                         writer.write(local_size[j]);
1862                 writer.end_op(OP_EXECUTION_MODE);
1863         }
1864 }
1865
1866 void SpirVGenerator::visit(FunctionDeclaration &func)
1867 {
1868         if(func.source==BUILTIN_SOURCE)
1869                 return;
1870         else if(func.definition!=&func)
1871         {
1872                 if(func.definition)
1873                         allocate_forward_id(*func.definition);
1874                 return;
1875         }
1876
1877         Id return_type_id = get_id(*func.return_type_declaration);
1878         vector<unsigned> param_type_ids;
1879         param_type_ids.reserve(func.parameters.size());
1880         for(const RefPtr<VariableDeclaration> &p: func.parameters)
1881                 param_type_ids.push_back(get_variable_type_id(*p));
1882
1883         string sig_with_return = func.return_type+func.signature;
1884         Id &type_id = function_type_ids[sig_with_return];
1885         if(!type_id)
1886         {
1887                 type_id = next_id++;
1888                 writer.begin_op(content.globals, OP_TYPE_FUNCTION);
1889                 writer.write(type_id);
1890                 writer.write(return_type_id);
1891                 for(unsigned i: param_type_ids)
1892                         writer.write(i);
1893                 writer.end_op(OP_TYPE_FUNCTION);
1894
1895                 writer.write_op_name(type_id, sig_with_return);
1896         }
1897
1898         Id func_id = allocate_id(func, type_id);
1899         writer.write_op_name(func_id, func.name+func.signature);
1900
1901         if(func.name=="main")
1902                 visit_entry_point(func, func_id);
1903
1904         writer.begin_op(content.functions, OP_FUNCTION, 5);
1905         writer.write(return_type_id);
1906         writer.write(func_id);
1907         writer.write(0);  // Function control flags (none)
1908         writer.write(type_id);
1909         writer.end_op(OP_FUNCTION);
1910
1911         for(unsigned i=0; i<func.parameters.size(); ++i)
1912         {
1913                 Id param_id = allocate_id(*func.parameters[i], param_type_ids[i]);
1914                 writer.write_op(content.functions, OP_FUNCTION_PARAMETER, param_type_ids[i], param_id);
1915                 writer.write_op_name(param_id, func.parameters[i]->name);
1916                 // TODO This is probably incorrect if the parameter is assigned to.
1917                 variable_load_ids[func.parameters[i].get()] = param_id;
1918         }
1919
1920         reachable = true;
1921         writer.begin_function_body(next_id++);
1922         SetForScope<FunctionDeclaration *> set_func(current_function, &func);
1923         func.body.visit(*this);
1924
1925         if(writer.get_current_block())
1926         {
1927                 if(!reachable)
1928                         writer.write_op(content.function_body, OP_UNREACHABLE);
1929                 else
1930                 {
1931                         const BasicTypeDeclaration *basic_return = dynamic_cast<const BasicTypeDeclaration *>(func.return_type_declaration);
1932                         if(basic_return && basic_return->kind==BasicTypeDeclaration::VOID)
1933                                 writer.write_op(content.function_body, OP_RETURN);
1934                         else
1935                                 throw internal_error("missing return in non-void function");
1936                 }
1937         }
1938         writer.end_function_body();
1939         variable_load_ids.clear();
1940 }
1941
1942 void SpirVGenerator::visit(Conditional &cond)
1943 {
1944         cond.condition->visit(*this);
1945
1946         Id true_label_id = next_id++;
1947         Id merge_block_id = next_id++;
1948         Id false_label_id = (cond.else_body.body.empty() ? merge_block_id : next_id++);
1949         writer.write_op(content.function_body, OP_SELECTION_MERGE, merge_block_id, 0);  // Selection control (none)
1950         writer.write_op(content.function_body, OP_BRANCH_CONDITIONAL, r_expression_result_id, true_label_id, false_label_id);
1951
1952         std::map<const VariableDeclaration *, Id> saved_load_ids = variable_load_ids;
1953
1954         writer.write_op_label(true_label_id);
1955         cond.body.visit(*this);
1956         if(writer.get_current_block())
1957                 writer.write_op(content.function_body, OP_BRANCH, merge_block_id);
1958
1959         bool reachable_if_true = reachable;
1960
1961         reachable = true;
1962         if(!cond.else_body.body.empty())
1963         {
1964                 swap(saved_load_ids, variable_load_ids);
1965                 writer.write_op_label(false_label_id);
1966                 cond.else_body.visit(*this);
1967                 reachable |= reachable_if_true;
1968         }
1969
1970         writer.write_op_label(merge_block_id);
1971         prune_loads(true_label_id);
1972 }
1973
1974 void SpirVGenerator::visit(Iteration &iter)
1975 {
1976         if(iter.init_statement)
1977                 iter.init_statement->visit(*this);
1978
1979         for(Node *n: AssignmentCollector().apply(iter))
1980                 if(VariableDeclaration *var = dynamic_cast<VariableDeclaration *>(n))
1981                         variable_load_ids.erase(var);
1982
1983         Id header_id = next_id++;
1984         Id continue_id = next_id++;
1985         Id merge_block_id = next_id++;
1986
1987         SetForScope<Id> set_merge(loop_merge_block_id, merge_block_id);
1988         SetForScope<Id> set_continue(loop_continue_target_id, continue_id);
1989
1990         writer.write_op_label(header_id);
1991         writer.write_op(content.function_body, OP_LOOP_MERGE, merge_block_id, continue_id, 0);  // Loop control (none)
1992
1993         Id body_id = next_id++;
1994         if(iter.condition)
1995         {
1996                 writer.write_op_label(next_id++);
1997                 iter.condition->visit(*this);
1998                 writer.write_op(content.function_body, OP_BRANCH_CONDITIONAL, r_expression_result_id, body_id, merge_block_id);
1999         }
2000
2001         writer.write_op_label(body_id);
2002         iter.body.visit(*this);
2003
2004         writer.write_op_label(continue_id);
2005         if(iter.loop_expression)
2006                 iter.loop_expression->visit(*this);
2007         writer.write_op(content.function_body, OP_BRANCH, header_id);
2008
2009         writer.write_op_label(merge_block_id);
2010         prune_loads(header_id);
2011         reachable = true;
2012 }
2013
2014 void SpirVGenerator::visit(Return &ret)
2015 {
2016         if(ret.expression)
2017         {
2018                 ret.expression->visit(*this);
2019                 writer.write_op(content.function_body, OP_RETURN_VALUE, r_expression_result_id);
2020         }
2021         else
2022                 writer.write_op(content.function_body, OP_RETURN);
2023         reachable = false;
2024 }
2025
2026 void SpirVGenerator::visit(Jump &jump)
2027 {
2028         if(jump.keyword=="discard")
2029                 writer.write_op(content.function_body, OP_KILL);
2030         else if(jump.keyword=="break")
2031                 writer.write_op(content.function_body, OP_BRANCH, loop_merge_block_id);
2032         else if(jump.keyword=="continue")
2033                 writer.write_op(content.function_body, OP_BRANCH, loop_continue_target_id);
2034         else
2035                 throw internal_error("unknown jump");
2036         reachable = false;
2037 }
2038
2039
2040 SpirVGenerator::TypeKey::TypeKey(BasicTypeDeclaration::Kind kind, bool sign):
2041         type_id(0)
2042 {
2043         switch(kind)
2044         {
2045         case BasicTypeDeclaration::VOID: detail = 'v'; break;
2046         case BasicTypeDeclaration::BOOL: detail = 'b'; break;
2047         case BasicTypeDeclaration::INT: detail = (sign ? 'i' : 'u'); break;
2048         case BasicTypeDeclaration::FLOAT: detail = 'f'; break;
2049         default: throw invalid_argument("TypeKey::TypeKey");
2050         }
2051 }
2052
2053 bool SpirVGenerator::TypeKey::operator<(const TypeKey &other) const
2054 {
2055         if(type_id!=other.type_id)
2056                 return type_id<other.type_id;
2057         return detail<other.detail;
2058 }
2059
2060
2061 bool SpirVGenerator::ConstantKey::operator<(const ConstantKey &other) const
2062 {
2063         if(type_id!=other.type_id)
2064                 return type_id<other.type_id;
2065         return int_value<other.int_value;
2066 }
2067
2068 } // namespace SL
2069 } // namespace GL
2070 } // namespace Msp