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