source/glsl/spirv.cpp

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