source/glsl/spirv.cpp

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