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