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