source/glsl/spirv.cpp

   1 #include <msp/core/algorithm.h>
   2 #include <msp/core/maputils.h>
   3 #include <msp/core/raii.h>
   4 #include "reflect.h"
   5 #include "spirv.h"
   6
   7 using namespace std;
   8
   9 namespace Msp {
  10 namespace GL {
  11 namespace SL {
  12
  13 const SpirVGenerator::BuiltinFunctionInfo SpirVGenerator::builtin_functions[] =
  14 {
  15         { "radians", "f", "GLSL.std.450", GLSL450_RADIANS, { 1 }, 0, 0 },
  16         { "degrees", "f", "GLSL.std.450", GLSL450_DEGREES, { 1 }, 0, 0 },
  17         { "sin", "f", "GLSL.std.450", GLSL450_SIN, { 1 }, 0, 0 },
  18         { "cos", "f", "GLSL.std.450", GLSL450_COS, { 1 }, 0, 0 },
  19         { "tan", "f", "GLSL.std.450", GLSL450_TAN, { 1 }, 0, 0 },
  20         { "asin", "f", "GLSL.std.450", GLSL450_ASIN, { 1 }, 0, 0 },
  21         { "acos", "f", "GLSL.std.450", GLSL450_ACOS, { 1 }, 0, 0 },
  22         { "atan", "f", "GLSL.std.450", GLSL450_ATAN, { 1 }, 0, 0 },
  23         { "atan", "ff", "GLSL.std.450", GLSL450_ATAN2, { 1, 2 }, 0, 0 },
  24         { "sinh", "f", "GLSL.std.450", GLSL450_SINH, { 1 }, 0, 0 },
  25         { "cosh", "f", "GLSL.std.450", GLSL450_COSH, { 1 }, 0, 0 },
  26         { "tanh", "f", "GLSL.std.450", GLSL450_TANH, { 1 }, 0, 0 },
  27         { "asinh", "f", "GLSL.std.450", GLSL450_ASINH, { 1 }, 0, 0 },
  28         { "acosh", "f", "GLSL.std.450", GLSL450_ACOSH, { 1 }, 0, 0 },
  29         { "atanh", "f", "GLSL.std.450", GLSL450_ATANH, { 1 }, 0, 0 },
  30         { "pow", "ff", "GLSL.std.450", GLSL450_POW, { 1, 2 }, 0, 0 },
  31         { "exp", "f", "GLSL.std.450", GLSL450_EXP, { 1 }, 0, 0 },
  32         { "log", "f", "GLSL.std.450", GLSL450_LOG, { 1 }, 0, 0 },
  33         { "exp2", "f", "GLSL.std.450", GLSL450_EXP2, { 1 }, 0, 0 },
  34         { "log2", "f", "GLSL.std.450", GLSL450_LOG2, { 1 }, 0, 0 },
  35         { "sqrt", "f", "GLSL.std.450", GLSL450_SQRT, { 1 }, 0, 0 },
  36         { "inversesqrt", "f", "GLSL.std.450", GLSL450_INVERSE_SQRT, { 1 }, 0, 0 },
  37         { "abs", "f", "GLSL.std.450", GLSL450_F_ABS, { 1 }, 0, 0 },
  38         { "abs", "i", "GLSL.std.450", GLSL450_S_ABS, { 1 }, 0, 0 },
  39         { "sign", "f", "GLSL.std.450", GLSL450_F_SIGN, { 1 }, 0, 0 },
  40         { "sign", "i", "GLSL.std.450", GLSL450_S_SIGN, { 1 }, 0, 0 },
  41         { "floor", "f", "GLSL.std.450", GLSL450_FLOOR, { 1 }, 0, 0 },
  42         { "trunc", "f", "GLSL.std.450", GLSL450_TRUNC, { 1 }, 0, 0 },
  43         { "round", "f", "GLSL.std.450", GLSL450_ROUND, { 1 }, 0, 0 },
  44         { "roundEven", "f", "GLSL.std.450", GLSL450_ROUND_EVEN, { 1 }, 0, 0 },
  45         { "ceil", "f", "GLSL.std.450", GLSL450_CEIL, { 1 }, 0, 0 },
  46         { "fract", "f", "GLSL.std.450", GLSL450_FRACT, { 1 }, 0, 0 },
  47         { "mod", "f", "", OP_F_MOD, { 1, 2 }, 0, 0 },
  48         { "min", "ff", "GLSL.std.450", GLSL450_F_MIN, { 1, 2 }, 0, 0 },
  49         { "min", "ii", "GLSL.std.450", GLSL450_S_MIN, { 1, 2 }, 0, 0 },
  50         { "min", "uu", "GLSL.std.450", GLSL450_U_MIN, { 1, 2 }, 0, 0 },
  51         { "max", "ff", "GLSL.std.450", GLSL450_F_MAX, { 1, 2 }, 0, 0 },
  52         { "max", "ii", "GLSL.std.450", GLSL450_S_MAX, { 1, 2 }, 0, 0 },
  53         { "max", "uu", "GLSL.std.450", GLSL450_U_MAX, { 1, 2 }, 0, 0 },
  54         { "clamp", "fff", "GLSL.std.450", GLSL450_F_CLAMP, { 1, 2, 3 }, 0, 0 },
  55         { "clamp", "iii", "GLSL.std.450", GLSL450_S_CLAMP, { 1, 2, 3 }, 0, 0 },
  56         { "clamp", "uuu", "GLSL.std.450", GLSL450_U_CLAMP, { 1, 2, 3 }, 0, 0 },
  57         { "mix", "fff", "GLSL.std.450", GLSL450_F_MIX, { 1, 2, 3 }, 0, 0 },
  58         { "mix", "ffb", "", OP_SELECT, { 3, 2, 1 }, 0, 0 },
  59         { "mix", "iib", "", OP_SELECT, { 3, 2, 1 }, 0, 0 },
  60         { "mix", "uub", "", OP_SELECT, { 3, 2, 1 }, 0, 0 },
  61         { "step", "ff", "GLSL.std.450", GLSL450_F_STEP, { 1, 2 }, 0, 0 },
  62         { "smoothstep", "fff", "GLSL.std.450", GLSL450_F_SMOOTH_STEP, { 1, 2, 3 }, 0, 0 },
  63         { "isnan", "f", "", OP_IS_NAN, { 1 }, 0, 0 },
  64         { "isinf", "f", "", OP_IS_INF, { 1 }, 0, 0 },
  65         { "fma", "fff", "GLSL.std.450", GLSL450_F_FMA, { 1, 2, 3 }, 0, 0 },
  66         { "length", "f", "GLSL.std.450", GLSL450_LENGTH, { 1 }, 0, 0 },
  67         { "distance", "ff", "GLSL.std.450", GLSL450_DISTANCE, { 1, 2 }, 0, 0 },
  68         { "dot", "ff", "", OP_DOT, { 1, 2 }, 0, 0 },
  69         { "cross", "ff", "GLSL.std.450", GLSL450_CROSS, { 1, 2 }, 0, 0 },
  70         { "normalize", "f", "GLSL.std.450", GLSL450_NORMALIZE, { 1 }, 0, 0 },
  71         { "faceforward", "fff", "GLSL.std.450", GLSL450_FACE_FORWARD, { 1, 2, 3 }, 0, 0 },
  72         { "reflect", "ff", "GLSL.std.450", GLSL450_REFLECT, { 1, 2 }, 0, 0 },
  73         { "refract", "fff", "GLSL.std.450", GLSL450_REFRACT, { 1, 2, 3 }, 0, 0 },
  74         { "matrixCompMult", "ff", "", 0, { 0 }, 0, &SpirVGenerator::visit_builtin_matrix_comp_mult },
  75         { "outerProduct", "ff", "", OP_OUTER_PRODUCT, { 1, 2 }, 0, 0 },
  76         { "transpose", "f", "", OP_TRANSPOSE, { 1 }, 0, 0 },
  77         { "determinant", "f", "GLSL.std.450", GLSL450_DETERMINANT, { 1 }, 0, 0 },
  78         { "inverse", "f", "GLSL.std.450", GLSL450_MATRIX_INVERSE, { 1 }, 0, 0 },
  79         { "lessThan", "ff", "", OP_F_ORD_LESS_THAN, { 1, 2 }, 0, 0 },
  80         { "lessThan", "ii", "", OP_S_LESS_THAN, { 1, 2 }, 0, 0 },
  81         { "lessThan", "uu", "", OP_U_LESS_THAN, { 1, 2 }, 0, 0 },
  82         { "lessThanEqual", "ff", "", OP_F_ORD_LESS_THAN_EQUAL, { 1, 2 }, 0, 0 },
  83         { "lessThanEqual", "ii", "", OP_S_LESS_THAN_EQUAL, { 1, 2 }, 0, 0 },
  84         { "lessThanEqual", "uu", "", OP_U_LESS_THAN_EQUAL, { 1, 2 }, 0, 0 },
  85         { "greaterThan", "ff", "", OP_F_ORD_GREATER_THAN, { 1, 2 }, 0, 0 },
  86         { "greaterThan", "ii", "", OP_S_GREATER_THAN, { 1, 2 }, 0, 0 },
  87         { "greaterThan", "uu", "", OP_U_GREATER_THAN, { 1, 2 }, 0, 0 },
  88         { "greaterThanEqual", "ff", "", OP_F_ORD_GREATER_THAN_EQUAL, { 1, 2 }, 0, 0 },
  89         { "greaterThanEqual", "ii", "", OP_S_GREATER_THAN_EQUAL, { 1, 2 }, 0, 0 },
  90         { "greaterThanEqual", "uu", "", OP_U_GREATER_THAN_EQUAL, { 1, 2 }, 0, 0 },
  91         { "equal", "ff", "", OP_F_ORD_EQUAL, { 1, 2 }, 0, 0 },
  92         { "equal", "ii", "", OP_I_EQUAL, { 1, 2 }, 0, 0 },
  93         { "equal", "uu", "", OP_I_EQUAL, { 1, 2 }, 0, 0 },
  94         { "notEqual", "ff", "", OP_F_ORD_NOT_EQUAL, { 1, 2 }, 0, 0 },
  95         { "notEqual", "ii", "", OP_I_NOT_EQUAL, { 1, 2 }, 0, 0 },
  96         { "notEqual", "uu", "", OP_I_NOT_EQUAL, { 1, 2 }, 0, 0 },
  97         { "any", "b", "", OP_ANY, { 1 }, 0, 0 },
  98         { "all", "b", "", OP_ALL, { 1 }, 0, 0 },
  99         { "not", "b", "", OP_LOGICAL_NOT, { 1 }, 0, 0 },
 100         { "bitfieldExtract", "iii", "", OP_BIT_FIELD_S_EXTRACT, { 1, 2, 3 }, 0, 0 },
 101         { "bitfieldExtract", "uii", "", OP_BIT_FIELD_U_EXTRACT, { 1, 2, 3 }, 0, 0 },
 102         { "bitfieldInsert", "iiii", "", OP_BIT_FIELD_INSERT, { 1, 2, 3, 4 }, 0, 0 },
 103         { "bitfieldInsert", "uuii", "", OP_BIT_FIELD_INSERT, { 1, 2, 3, 4 }, 0, 0 },
 104         { "bitfieldReverse", "i", "", OP_BIT_REVERSE, { 1 }, 0, 0 },
 105         { "bitfieldReverse", "u", "", OP_BIT_REVERSE, { 1 }, 0, 0 },
 106         { "bitCount", "i", "", OP_BIT_COUNT, { 1 }, 0, 0 },
 107         { "findLSB", "i", "GLSL.std.450", GLSL450_FIND_I_LSB, { 1 }, 0, 0 },
 108         { "findLSB", "u", "GLSL.std.450", GLSL450_FIND_I_LSB, { 1 }, 0, 0 },
 109         { "findMSB", "i", "GLSL.std.450", GLSL450_FIND_S_MSB, { 1 }, 0, 0 },
 110         { "findMSB", "u", "GLSL.std.450", GLSL450_FIND_U_MSB, { 1 }, 0, 0 },
 111         { "textureSize", "", "", 0, { }, CAP_IMAGE_QUERY, &SpirVGenerator::visit_builtin_texture_query },
 112         { "textureQueryLod", "", "", 0, { }, CAP_IMAGE_QUERY, &SpirVGenerator::visit_builtin_texture_query },
 113         { "textureQueryLevels", "", "", 0, { }, CAP_IMAGE_QUERY, &SpirVGenerator::visit_builtin_texture_query },
 114         { "texture", "", "", 0, { }, 0, &SpirVGenerator::visit_builtin_texture },
 115         { "textureLod", "", "", 0, { }, 0, &SpirVGenerator::visit_builtin_texture },
 116         { "texelFetch", "", "", 0, { }, 0, &SpirVGenerator::visit_builtin_texel_fetch },
 117         { "EmitVertex", "", "", OP_EMIT_VERTEX, { }, 0, 0 },
 118         { "EndPrimitive", "", "", OP_END_PRIMITIVE, { }, 0, 0 },
 119         { "dFdx", "f", "", OP_DP_DX, { 1 }, 0, 0 },
 120         { "dFdy", "f", "", OP_DP_DY, { 1 }, 0, 0 },
 121         { "dFdxFine", "f", "", OP_DP_DX_FINE, { 1 }, CAP_DERIVATIVE_CONTROL, 0 },
 122         { "dFdyFine", "f", "", OP_DP_DY_FINE, { 1 }, CAP_DERIVATIVE_CONTROL, 0 },
 123         { "dFdxCoarse", "f", "", OP_DP_DX_COARSE, { 1 }, CAP_DERIVATIVE_CONTROL, 0 },
 124         { "dFdyCoarse", "f", "", OP_DP_DY_COARSE, { 1 }, CAP_DERIVATIVE_CONTROL, 0 },
 125         { "fwidth", "f", "", OP_FWIDTH, { 1 }, 0, 0 },
 126         { "fwidthFine", "f", "", OP_FWIDTH_FINE, { 1 }, CAP_DERIVATIVE_CONTROL, 0 },
 127         { "fwidthCoarse", "f", "", OP_FWIDTH_COARSE, { 1 }, CAP_DERIVATIVE_CONTROL, 0 },
 128         { "interpolateAtCentroid", "", "", 0, { }, CAP_INTERPOLATION_FUNCTION, &SpirVGenerator::visit_builtin_interpolate },
 129         { "interpolateAtSample", "", "", 0, { }, CAP_INTERPOLATION_FUNCTION, &SpirVGenerator::visit_builtin_interpolate },
 130         { "interpolateAtOffset", "", "", 0, { }, CAP_INTERPOLATION_FUNCTION, &SpirVGenerator::visit_builtin_interpolate },
 131         { "", "", "", 0, { }, 0, 0 }
 132 };
 133
 134 SpirVGenerator::SpirVGenerator():
 135         writer(content)
 136 { }
 137
 138 void SpirVGenerator::apply(Module &module, const Features &f)
 139 {
 140         features = f;
 141         use_capability(CAP_SHADER);
 142
 143         for(Stage &s: module.stages)
 144         {
 145                 stage = &s;
 146                 interface_layouts.clear();
 147                 s.content.visit(*this);
 148         }
 149
 150         writer.finalize(SPIRV_GENERATOR_MSP, next_id);
 151 }
 152
 153 SpirVGenerator::StorageClass SpirVGenerator::get_interface_storage(const string &iface, bool block)
 154 {
 155         if(iface=="in")
 156                 return STORAGE_INPUT;
 157         else if(iface=="out")
 158                 return STORAGE_OUTPUT;
 159         else if(iface=="uniform")
 160                 return (block ? STORAGE_UNIFORM : STORAGE_UNIFORM_CONSTANT);
 161         else if(iface.empty())
 162                 return STORAGE_PRIVATE;
 163         else
 164                 throw invalid_argument("SpirVGenerator::get_interface_storage");
 165 }
 166
 167 SpirVGenerator::BuiltinSemantic SpirVGenerator::get_builtin_semantic(const string &name)
 168 {
 169         if(name=="gl_Position")
 170                 return BUILTIN_POSITION;
 171         else if(name=="gl_PointSize")
 172                 return BUILTIN_POINT_SIZE;
 173         else if(name=="gl_ClipDistance")
 174                 return BUILTIN_CLIP_DISTANCE;
 175         else if(name=="gl_VertexID")
 176                 return BUILTIN_VERTEX_ID;
 177         else if(name=="gl_InstanceID")
 178                 return BUILTIN_INSTANCE_ID;
 179         else if(name=="gl_PrimitiveID" || name=="gl_PrimitiveIDIn")
 180                 return BUILTIN_PRIMITIVE_ID;
 181         else if(name=="gl_InvocationID")
 182                 return BUILTIN_INVOCATION_ID;
 183         else if(name=="gl_Layer")
 184                 return BUILTIN_LAYER;
 185         else if(name=="gl_FragCoord")
 186                 return BUILTIN_FRAG_COORD;
 187         else if(name=="gl_PointCoord")
 188                 return BUILTIN_POINT_COORD;
 189         else if(name=="gl_FrontFacing")
 190                 return BUILTIN_FRONT_FACING;
 191         else if(name=="gl_SampleId")
 192                 return BUILTIN_SAMPLE_ID;
 193         else if(name=="gl_SamplePosition")
 194                 return BUILTIN_SAMPLE_POSITION;
 195         else if(name=="gl_FragDepth")
 196                 return BUILTIN_FRAG_DEPTH;
 197         else
 198                 throw invalid_argument("SpirVGenerator::get_builtin_semantic");
 199 }
 200
 201 void SpirVGenerator::use_capability(Capability cap)
 202 {
 203         if(used_capabilities.count(cap))
 204                 return;
 205
 206         used_capabilities.insert(cap);
 207         writer.write_op(content.capabilities, OP_CAPABILITY, cap);
 208 }
 209
 210 SpirVGenerator::Id SpirVGenerator::import_extension(const string &name)
 211 {
 212         Id &ext_id = imported_extension_ids[name];
 213         if(!ext_id)
 214         {
 215                 ext_id = next_id++;
 216                 writer.begin_op(content.extensions, OP_EXT_INST_IMPORT);
 217                 writer.write(ext_id);
 218                 writer.write_string(name);
 219                 writer.end_op(OP_EXT_INST_IMPORT);
 220         }
 221         return ext_id;
 222 }
 223
 224 SpirVGenerator::Id SpirVGenerator::get_id(Node &node) const
 225 {
 226         return get_item(declared_ids, &node).id;
 227 }
 228
 229 SpirVGenerator::Id SpirVGenerator::allocate_id(Node &node, Id type_id)
 230 {
 231         auto i = declared_ids.find(&node);
 232         if(i!=declared_ids.end())
 233         {
 234                 if(i->second.type_id)
 235                         throw key_error(&node);
 236                 i->second.type_id = type_id;
 237                 return i->second.id;
 238         }
 239
 240         Id id = next_id++;
 241         declared_ids.insert(make_pair(&node, Declaration(id, type_id)));
 242         return id;
 243 }
 244
 245 SpirVGenerator::Id SpirVGenerator::allocate_forward_id(Node &node)
 246 {
 247         auto i = declared_ids.find(&node);
 248         if(i!=declared_ids.end())
 249                 return i->second.id;
 250
 251         Id id = next_id++;
 252         declared_ids.insert(make_pair(&node, Declaration(id, 0)));
 253         return id;
 254 }
 255
 256 SpirVGenerator::Id SpirVGenerator::write_constant(Id type_id, Word value, bool spec)
 257 {
 258         Id const_id = next_id++;
 259         if(is_scalar_type(type_id, BasicTypeDeclaration::BOOL))
 260         {
 261                 Opcode opcode = (value ? (spec ? OP_SPEC_CONSTANT_TRUE : OP_CONSTANT_TRUE) :
 262                         (spec ? OP_SPEC_CONSTANT_FALSE : OP_CONSTANT_FALSE));
 263                 writer.write_op(content.globals, opcode, type_id, const_id);
 264         }
 265         else
 266         {
 267                 Opcode opcode = (spec ? OP_SPEC_CONSTANT : OP_CONSTANT);
 268                 writer.write_op(content.globals, opcode, type_id, const_id, value);
 269         }
 270         return const_id;
 271 }
 272
 273 SpirVGenerator::ConstantKey SpirVGenerator::get_constant_key(Id type_id, const Variant &value)
 274 {
 275         if(value.check_type<bool>())
 276                 return ConstantKey(type_id, value.value<bool>());
 277         else if(value.check_type<int>())
 278                 return ConstantKey(type_id, value.value<int>());
 279         else if(value.check_type<unsigned>())
 280                 return ConstantKey(type_id, value.value<unsigned>());
 281         else if(value.check_type<float>())
 282                 return ConstantKey(type_id, value.value<float>());
 283         else
 284                 throw invalid_argument("SpirVGenerator::get_constant_key");
 285 }
 286
 287 SpirVGenerator::Id SpirVGenerator::get_constant_id(Id type_id, const Variant &value)
 288 {
 289         ConstantKey key = get_constant_key(type_id, value);
 290         Id &const_id = constant_ids[key];
 291         if(!const_id)
 292                 const_id = write_constant(type_id, key.int_value, false);
 293         return const_id;
 294 }
 295
 296 SpirVGenerator::Id SpirVGenerator::get_vector_constant_id(Id type_id, unsigned size, Id scalar_id)
 297 {
 298         Id &const_id = constant_ids[get_constant_key(type_id, static_cast<int>(scalar_id))];
 299         if(!const_id)
 300         {
 301                 const_id = next_id++;
 302                 writer.begin_op(content.globals, OP_CONSTANT_COMPOSITE, 3+size);
 303                 writer.write(type_id);
 304                 writer.write(const_id);
 305                 for(unsigned i=0; i<size; ++i)
 306                         writer.write(scalar_id);
 307                 writer.end_op(OP_CONSTANT_COMPOSITE);
 308         }
 309         return const_id;
 310 }
 311
 312 SpirVGenerator::Id SpirVGenerator::get_standard_type_id(BasicTypeDeclaration::Kind kind, unsigned size, bool sign)
 313 {
 314         Id base_id = (size>1 ? get_standard_type_id(kind, 1, sign) : 0);
 315         Id &type_id = standard_type_ids[base_id ? TypeKey(base_id, size) : TypeKey(kind, sign)];
 316         if(!type_id)
 317         {
 318                 type_id = next_id++;
 319                 if(size>1)
 320                         writer.write_op(content.globals, OP_TYPE_VECTOR, type_id, base_id, size);
 321                 else if(kind==BasicTypeDeclaration::VOID)
 322                         writer.write_op(content.globals, OP_TYPE_VOID, type_id);
 323                 else if(kind==BasicTypeDeclaration::BOOL)
 324                         writer.write_op(content.globals, OP_TYPE_BOOL, type_id);
 325                 else if(kind==BasicTypeDeclaration::INT)
 326                         writer.write_op(content.globals, OP_TYPE_INT, type_id, 32, sign);
 327                 else if(kind==BasicTypeDeclaration::FLOAT)
 328                         writer.write_op(content.globals, OP_TYPE_FLOAT, type_id, 32);
 329                 else
 330                         throw invalid_argument("SpirVGenerator::get_standard_type_id");
 331         }
 332         return type_id;
 333 }
 334
 335 bool SpirVGenerator::is_scalar_type(Id type_id, BasicTypeDeclaration::Kind kind) const
 336 {
 337         auto i = standard_type_ids.find(TypeKey(kind, true));
 338         return (i!=standard_type_ids.end() && i->second==type_id);
 339 }
 340
 341 SpirVGenerator::Id SpirVGenerator::get_array_type_id(TypeDeclaration &base_type, Id size_id)
 342 {
 343         Id base_type_id = get_id(base_type);
 344         Id &array_type_id = array_type_ids[TypeKey(base_type_id, size_id)];
 345         if(!array_type_id)
 346         {
 347                 array_type_id = next_id++;
 348                 if(size_id)
 349                         writer.write_op(content.globals, OP_TYPE_ARRAY, array_type_id, base_type_id, size_id);
 350                 else
 351                         writer.write_op(content.globals, OP_TYPE_RUNTIME_ARRAY, array_type_id, base_type_id);
 352
 353                 unsigned stride = MemoryRequirementsCalculator().apply(base_type).stride;
 354                 writer.write_op_decorate(array_type_id, DECO_ARRAY_STRIDE, stride);
 355         }
 356
 357         return array_type_id;
 358 }
 359
 360 SpirVGenerator::Id SpirVGenerator::get_pointer_type_id(Id type_id, StorageClass storage)
 361 {
 362         Id &ptr_type_id = pointer_type_ids[TypeKey(type_id, storage)];
 363         if(!ptr_type_id)
 364         {
 365                 ptr_type_id = next_id++;
 366                 writer.write_op(content.globals, OP_TYPE_POINTER, ptr_type_id, storage, type_id);
 367         }
 368         return ptr_type_id;
 369 }
 370
 371 SpirVGenerator::Id SpirVGenerator::get_variable_type_id(const VariableDeclaration &var)
 372 {
 373         if(const BasicTypeDeclaration *basic = dynamic_cast<const BasicTypeDeclaration *>(var.type_declaration))
 374                 if(basic->kind==BasicTypeDeclaration::ARRAY)
 375                 {
 376                         Id size_id = 0;
 377                         if(var.array_size)
 378                         {
 379                                 SetFlag set_const(constant_expression);
 380                                 r_expression_result_id = 0;
 381                                 var.array_size->visit(*this);
 382                                 size_id = r_expression_result_id;
 383                         }
 384                         else
 385                                 size_id = get_constant_id(get_standard_type_id(BasicTypeDeclaration::INT, 1), 1);
 386                         return get_array_type_id(*basic->base_type, size_id);
 387                 }
 388
 389         return get_id(*var.type_declaration);
 390 }
 391
 392 SpirVGenerator::Id SpirVGenerator::get_load_id(VariableDeclaration &var)
 393 {
 394         Id &load_result_id = variable_load_ids[&var];
 395         if(!load_result_id)
 396         {
 397                 load_result_id = next_id++;
 398                 writer.write_op(content.function_body, OP_LOAD, get_variable_type_id(var), load_result_id, get_id(var));
 399         }
 400         return load_result_id;
 401 }
 402
 403 void SpirVGenerator::prune_loads(Id min_id)
 404 {
 405         for(auto i=variable_load_ids.begin(); i!=variable_load_ids.end(); )
 406         {
 407                 if(i->second>=min_id)
 408                         variable_load_ids.erase(i++);
 409                 else
 410                         ++i;
 411         }
 412 }
 413
 414 SpirVGenerator::Id SpirVGenerator::begin_expression(Opcode opcode, Id type_id, unsigned n_args)
 415 {
 416         bool has_result = (opcode==OP_FUNCTION_CALL || !is_scalar_type(type_id, BasicTypeDeclaration::VOID));
 417         if(!constant_expression)
 418         {
 419                 if(!current_function)
 420                         throw internal_error("non-constant expression outside a function");
 421
 422                 writer.begin_op(content.function_body, opcode, (n_args ? 1+has_result*2+n_args : 0));
 423         }
 424         else if(opcode==OP_COMPOSITE_CONSTRUCT)
 425                 writer.begin_op(content.globals, (spec_constant ? OP_SPEC_CONSTANT_COMPOSITE : OP_CONSTANT_COMPOSITE),
 426                         (n_args ? 1+has_result*2+n_args : 0));
 427         else if(!spec_constant)
 428                 throw internal_error("invalid non-specialization constant expression");
 429         else
 430                 writer.begin_op(content.globals, OP_SPEC_CONSTANT_OP, (n_args ? 2+has_result*2+n_args : 0));
 431
 432         Id result_id = next_id++;
 433         if(has_result)
 434         {
 435                 writer.write(type_id);
 436                 writer.write(result_id);
 437         }
 438         if(spec_constant && opcode!=OP_COMPOSITE_CONSTRUCT)
 439                 writer.write(opcode);
 440
 441         return result_id;
 442 }
 443
 444 void SpirVGenerator::end_expression(Opcode opcode)
 445 {
 446         if(constant_expression)
 447                 opcode = (opcode==OP_COMPOSITE_CONSTRUCT ? spec_constant ? OP_SPEC_CONSTANT_COMPOSITE : OP_CONSTANT_COMPOSITE : OP_SPEC_CONSTANT_OP);
 448         writer.end_op(opcode);
 449 }
 450
 451 SpirVGenerator::Id SpirVGenerator::write_expression(Opcode opcode, Id type_id, Id arg_id)
 452 {
 453         Id result_id = begin_expression(opcode, type_id, 1);
 454         writer.write(arg_id);
 455         end_expression(opcode);
 456         return result_id;
 457 }
 458
 459 SpirVGenerator::Id SpirVGenerator::write_expression(Opcode opcode, Id type_id, Id left_id, Id right_id)
 460 {
 461         Id result_id = begin_expression(opcode, type_id, 2);
 462         writer.write(left_id);
 463         writer.write(right_id);
 464         end_expression(opcode);
 465         return result_id;
 466 }
 467
 468 void SpirVGenerator::write_deconstruct(Id elem_type_id, Id composite_id, Id *elem_ids, unsigned n_elems)
 469 {
 470         for(unsigned i=0; i<n_elems; ++i)
 471         {
 472                 elem_ids[i] = begin_expression(OP_COMPOSITE_EXTRACT, elem_type_id, 2);
 473                 writer.write(composite_id);
 474                 writer.write(i);
 475                 end_expression(OP_COMPOSITE_EXTRACT);
 476         }
 477 }
 478
 479 SpirVGenerator::Id SpirVGenerator::write_construct(Id type_id, const Id *elem_ids, unsigned n_elems)
 480 {
 481         Id result_id = begin_expression(OP_COMPOSITE_CONSTRUCT, type_id, n_elems);
 482         for(unsigned i=0; i<n_elems; ++i)
 483                 writer.write(elem_ids[i]);
 484         end_expression(OP_COMPOSITE_CONSTRUCT);
 485
 486         return result_id;
 487 }
 488
 489 void SpirVGenerator::visit(Block &block)
 490 {
 491         for(const RefPtr<Statement> &s: block.body)
 492                 s->visit(*this);
 493 }
 494
 495 void SpirVGenerator::visit(Literal &literal)
 496 {
 497         Id type_id = get_id(*literal.type);
 498         if(spec_constant)
 499                 r_expression_result_id = write_constant(type_id, get_constant_key(type_id, literal.value).int_value, true);
 500         else
 501                 r_expression_result_id = get_constant_id(type_id, literal.value);
 502         r_constant_result = true;
 503 }
 504
 505 void SpirVGenerator::visit(VariableReference &var)
 506 {
 507         if(constant_expression || var.declaration->constant)
 508         {
 509                 if(!var.declaration->constant)
 510                         throw internal_error("reference to non-constant variable in constant context");
 511
 512                 r_expression_result_id = get_id(*var.declaration);
 513                 r_constant_result = true;
 514                 return;
 515         }
 516         else if(!current_function)
 517                 throw internal_error("non-constant context outside a function");
 518
 519         r_constant_result = false;
 520         if(composite_access)
 521         {
 522                 r_expression_result_id = 0;
 523                 if(!assignment_source_id)
 524                 {
 525                         auto i = variable_load_ids.find(var.declaration);
 526                         if(i!=variable_load_ids.end())
 527                                 r_expression_result_id = i->second;
 528                 }
 529                 if(!r_expression_result_id)
 530                         r_composite_base = var.declaration;
 531         }
 532         else if(assignment_source_id)
 533         {
 534                 writer.write_op(content.function_body, OP_STORE, get_id(*var.declaration), assignment_source_id);
 535                 variable_load_ids[var.declaration] = assignment_source_id;
 536                 r_expression_result_id = assignment_source_id;
 537         }
 538         else
 539                 r_expression_result_id = get_load_id(*var.declaration);
 540 }
 541
 542 void SpirVGenerator::visit(InterfaceBlockReference &iface)
 543 {
 544         if(!composite_access || !current_function)
 545                 throw internal_error("invalid interface block reference");
 546
 547         r_composite_base = iface.declaration;
 548         r_expression_result_id = 0;
 549         r_constant_result = false;
 550 }
 551
 552 void SpirVGenerator::generate_composite_access(TypeDeclaration &result_type)
 553 {
 554         Opcode opcode;
 555         Id result_type_id = get_id(result_type);
 556         Id access_type_id = result_type_id;
 557         if(r_composite_base)
 558         {
 559                 if(constant_expression)
 560                         throw internal_error("composite access through pointer in constant context");
 561
 562                 Id int32_type_id = get_standard_type_id(BasicTypeDeclaration::INT, 1);
 563                 for(unsigned &i: r_composite_chain)
 564                         i = (i<0x400000 ? get_constant_id(int32_type_id, static_cast<int>(i)) : i&0x3FFFFF);
 565
 566                 /* Find the storage class of the base and obtain appropriate pointer type
 567                 for the result. */
 568                 const Declaration &base_decl = get_item(declared_ids, r_composite_base);
 569                 auto i = pointer_type_ids.begin();
 570                 for(; (i!=pointer_type_ids.end() && i->second!=base_decl.type_id); ++i) ;
 571                 if(i==pointer_type_ids.end())
 572                         throw internal_error("could not find storage class");
 573                 access_type_id = get_pointer_type_id(result_type_id, static_cast<StorageClass>(i->first.detail));
 574
 575                 opcode = OP_ACCESS_CHAIN;
 576         }
 577         else if(assignment_source_id)
 578                 throw internal_error("assignment to temporary composite");
 579         else
 580         {
 581                 for(unsigned &i: r_composite_chain)
 582                         for(auto j=constant_ids.begin(); (i>=0x400000 && j!=constant_ids.end()); ++j)
 583                                 if(j->second==(i&0x3FFFFF))
 584                                         i = j->first.int_value;
 585
 586                 opcode = OP_COMPOSITE_EXTRACT;
 587         }
 588
 589         Id access_id = begin_expression(opcode, access_type_id, 1+r_composite_chain.size());
 590         writer.write(r_composite_base_id);
 591         for(unsigned i: r_composite_chain)
 592                 writer.write(i);
 593         end_expression(opcode);
 594
 595         r_constant_result = false;
 596         if(r_composite_base)
 597         {
 598                 if(assignment_source_id)
 599                 {
 600                         writer.write_op(content.function_body, OP_STORE, access_id, assignment_source_id);
 601                         r_expression_result_id = assignment_source_id;
 602                 }
 603                 else
 604                         r_expression_result_id = write_expression(OP_LOAD, result_type_id, access_id);
 605         }
 606         else
 607                 r_expression_result_id = access_id;
 608 }
 609
 610 void SpirVGenerator::visit_composite(Expression &base_expr, unsigned index, TypeDeclaration &type)
 611 {
 612         if(!composite_access)
 613         {
 614                 r_composite_base = 0;
 615                 r_composite_base_id = 0;
 616                 r_composite_chain.clear();
 617         }
 618
 619         {
 620                 SetFlag set_composite(composite_access);
 621                 base_expr.visit(*this);
 622         }
 623
 624         if(!r_composite_base_id)
 625                 r_composite_base_id = (r_composite_base ? get_id(*r_composite_base) : r_expression_result_id);
 626
 627         r_composite_chain.push_back(index);
 628         if(!composite_access)
 629                 generate_composite_access(type);
 630         else
 631                 r_expression_result_id = 0;
 632 }
 633
 634 void SpirVGenerator::visit_isolated(Expression &expr)
 635 {
 636         SetForScope<Id> clear_assign(assignment_source_id, 0);
 637         SetFlag clear_composite(composite_access, false);
 638         SetForScope<Node *> clear_base(r_composite_base, 0);
 639         SetForScope<Id> clear_base_id(r_composite_base_id, 0);
 640         vector<unsigned> saved_chain;
 641         swap(saved_chain, r_composite_chain);
 642         expr.visit(*this);
 643         swap(saved_chain, r_composite_chain);
 644 }
 645
 646 void SpirVGenerator::visit(MemberAccess &memacc)
 647 {
 648         visit_composite(*memacc.left, memacc.index, *memacc.type);
 649 }
 650
 651 void SpirVGenerator::visit(Swizzle &swizzle)
 652 {
 653         if(swizzle.count==1)
 654                 visit_composite(*swizzle.left, swizzle.components[0], *swizzle.type);
 655         else if(assignment_source_id)
 656         {
 657                 const BasicTypeDeclaration &basic = dynamic_cast<const BasicTypeDeclaration &>(*swizzle.left->type);
 658
 659                 unsigned mask = 0;
 660                 for(unsigned i=0; i<swizzle.count; ++i)
 661                         mask |= 1<<swizzle.components[i];
 662
 663                 visit_isolated(*swizzle.left);
 664
 665                 Id combined_id = begin_expression(OP_VECTOR_SHUFFLE, get_id(*swizzle.left->type), 2+basic.size);
 666                 writer.write(r_expression_result_id);
 667                 writer.write(assignment_source_id);
 668                 for(unsigned i=0; i<basic.size; ++i)
 669                         writer.write(i+((mask>>i)&1)*basic.size);
 670                 end_expression(OP_VECTOR_SHUFFLE);
 671
 672                 SetForScope<Id> set_assign(assignment_source_id, combined_id);
 673                 swizzle.left->visit(*this);
 674
 675                 r_expression_result_id = combined_id;
 676         }
 677         else
 678         {
 679                 swizzle.left->visit(*this);
 680                 Id left_id = r_expression_result_id;
 681
 682                 r_expression_result_id = begin_expression(OP_VECTOR_SHUFFLE, get_id(*swizzle.type), 2+swizzle.count);
 683                 writer.write(left_id);
 684                 writer.write(left_id);
 685                 for(unsigned i=0; i<swizzle.count; ++i)
 686                         writer.write(swizzle.components[i]);
 687                 end_expression(OP_VECTOR_SHUFFLE);
 688         }
 689         r_constant_result = false;
 690 }
 691
 692 void SpirVGenerator::visit(UnaryExpression &unary)
 693 {
 694         if(composite_access)
 695                 return visit_isolated(unary);
 696
 697         unary.expression->visit(*this);
 698
 699         char oper = unary.oper->token[0];
 700         char oper2 = unary.oper->token[1];
 701         if(oper=='+' && !oper2)
 702                 return;
 703
 704         BasicTypeDeclaration &basic = dynamic_cast<BasicTypeDeclaration &>(*unary.expression->type);
 705         BasicTypeDeclaration &elem = *get_element_type(basic);
 706
 707         if(constant_expression && elem.kind!=BasicTypeDeclaration::BOOL && elem.kind!=BasicTypeDeclaration::INT)
 708                 /* SPIR-V allows constant operations on floating-point values only for
 709                 OpenGL kernels. */
 710                 throw internal_error("invalid operands for constant unary expression");
 711
 712         Id result_type_id = get_id(*unary.type);
 713         Opcode opcode = OP_NOP;
 714
 715         r_constant_result = false;
 716         if(oper=='!')
 717                 opcode = OP_LOGICAL_NOT;
 718         else if(oper=='~')
 719                 opcode = OP_NOT;
 720         else if(oper=='-' && !oper2)
 721         {
 722                 opcode = (elem.kind==BasicTypeDeclaration::INT ? OP_S_NEGATE : OP_F_NEGATE);
 723
 724                 if(basic.kind==BasicTypeDeclaration::MATRIX)
 725                 {
 726                         Id column_type_id = get_id(*basic.base_type);
 727                         unsigned n_columns = basic.size&0xFFFF;
 728                         Id column_ids[4];
 729                         write_deconstruct(column_type_id, r_expression_result_id, column_ids, n_columns);
 730                         for(unsigned i=0; i<n_columns; ++i)
 731                                 column_ids[i] = write_expression(opcode, column_type_id, column_ids[i]);
 732                         r_expression_result_id = write_construct(result_type_id, column_ids, n_columns);
 733                         return;
 734                 }
 735         }
 736         else if((oper=='+' || oper=='-') && oper2==oper)
 737         {
 738                 if(constant_expression)
 739                         throw internal_error("increment or decrement in constant expression");
 740
 741                 Id one_id = 0;
 742                 if(elem.kind==BasicTypeDeclaration::INT)
 743                 {
 744                         opcode = (oper=='+' ? OP_I_ADD : OP_I_SUB);
 745                         one_id = get_constant_id(get_id(elem), 1);
 746                 }
 747                 else if(elem.kind==BasicTypeDeclaration::FLOAT)
 748                 {
 749                         opcode = (oper=='+' ? OP_F_ADD : OP_F_SUB);
 750                         one_id = get_constant_id(get_id(elem), 1.0f);
 751                 }
 752                 else
 753                         throw internal_error("invalid increment/decrement");
 754
 755                 if(basic.kind==BasicTypeDeclaration::VECTOR)
 756                         one_id = get_vector_constant_id(result_type_id, basic.size, one_id);
 757
 758                 Id post_value_id = write_expression(opcode, result_type_id, r_expression_result_id, one_id);
 759
 760                 SetForScope<Id> set_assign(assignment_source_id, post_value_id);
 761                 unary.expression->visit(*this);
 762
 763                 r_expression_result_id = (unary.oper->type==Operator::POSTFIX ? r_expression_result_id : post_value_id);
 764                 return;
 765         }
 766
 767         if(opcode==OP_NOP)
 768                 throw internal_error("unknown unary operator");
 769
 770         r_expression_result_id = write_expression(opcode, result_type_id, r_expression_result_id);
 771 }
 772
 773 void SpirVGenerator::visit(BinaryExpression &binary)
 774 {
 775         char oper = binary.oper->token[0];
 776         if(oper=='[')
 777         {
 778                 visit_isolated(*binary.right);
 779                 return visit_composite(*binary.left, 0x400000|r_expression_result_id, *binary.type);
 780         }
 781         else if(composite_access)
 782                 return visit_isolated(binary);
 783
 784         if(assignment_source_id)
 785                 throw internal_error("invalid binary expression in assignment target");
 786
 787         BasicTypeDeclaration &basic_left = dynamic_cast<BasicTypeDeclaration &>(*binary.left->type);
 788         BasicTypeDeclaration &basic_right = dynamic_cast<BasicTypeDeclaration &>(*binary.right->type);
 789         // Expression resolver ensures that element types are the same
 790         BasicTypeDeclaration &elem = *get_element_type(basic_left);
 791
 792         if(constant_expression && elem.kind!=BasicTypeDeclaration::BOOL && elem.kind!=BasicTypeDeclaration::INT)
 793                 /* SPIR-V allows constant operations on floating-point values only for
 794                 OpenGL kernels. */
 795                 throw internal_error("invalid operands for constant binary expression");
 796
 797         binary.left->visit(*this);
 798         Id left_id = r_expression_result_id;
 799         binary.right->visit(*this);
 800         Id right_id = r_expression_result_id;
 801
 802         Id result_type_id = get_id(*binary.type);
 803         Opcode opcode = OP_NOP;
 804         bool swap_operands = false;
 805
 806         r_constant_result = false;
 807
 808         char oper2 = binary.oper->token[1];
 809         if((oper=='<' || oper=='>') && oper2!=oper)
 810         {
 811                 if(basic_left.kind==BasicTypeDeclaration::INT)
 812                 {
 813                         if(basic_left.sign)
 814                                 opcode = (oper=='<' ? (oper2=='=' ? OP_S_LESS_THAN_EQUAL : OP_S_LESS_THAN) :
 815                                         (oper2=='=' ? OP_S_GREATER_THAN_EQUAL : OP_S_GREATER_THAN));
 816                         else
 817                                 opcode = (oper=='<' ? (oper2=='=' ? OP_U_LESS_THAN_EQUAL : OP_U_LESS_THAN) :
 818                                         (oper2=='=' ? OP_U_GREATER_THAN_EQUAL : OP_U_GREATER_THAN));
 819                 }
 820                 else if(basic_left.kind==BasicTypeDeclaration::FLOAT)
 821                         opcode = (oper=='<' ? (oper2=='=' ? OP_F_ORD_LESS_THAN_EQUAL : OP_F_ORD_LESS_THAN) :
 822                                 (oper2=='=' ? OP_F_ORD_GREATER_THAN_EQUAL : OP_F_ORD_GREATER_THAN));
 823         }
 824         else if((oper=='=' || oper=='!') && oper2=='=')
 825         {
 826                 if(elem.kind==BasicTypeDeclaration::BOOL)
 827                         opcode = (oper=='=' ? OP_LOGICAL_EQUAL : OP_LOGICAL_NOT_EQUAL);
 828                 else if(elem.kind==BasicTypeDeclaration::INT)
 829                         opcode = (oper=='=' ? OP_I_EQUAL : OP_I_NOT_EQUAL);
 830                 else if(elem.kind==BasicTypeDeclaration::FLOAT)
 831                         opcode = (oper=='=' ? OP_F_ORD_EQUAL : OP_F_ORD_NOT_EQUAL);
 832
 833                 if(opcode!=OP_NOP && basic_left.base_type)
 834                 {
 835                         /* The SPIR-V equality operations produce component-wise results, but
 836                         GLSL operators return a single boolean.  Use the any/all operations to
 837                         combine the results. */
 838                         Opcode combine_op = (oper=='!' ? OP_ANY : OP_ALL);
 839                         unsigned n_elems = basic_left.size&0xFFFF;
 840                         Id bool_vec_type_id = get_standard_type_id(BasicTypeDeclaration::BOOL, n_elems);
 841
 842                         Id compare_id = 0;
 843                         if(basic_left.kind==BasicTypeDeclaration::VECTOR)
 844                                 compare_id = write_expression(opcode, bool_vec_type_id, left_id, right_id);
 845                         else if(basic_left.kind==BasicTypeDeclaration::MATRIX)
 846                         {
 847                                 Id column_type_id = get_id(*basic_left.base_type);
 848                                 Id column_ids[8];
 849                                 write_deconstruct(column_type_id, left_id, column_ids, n_elems);
 850                                 write_deconstruct(column_type_id, right_id, column_ids+4, n_elems);
 851
 852                                 Id column_bvec_type_id = get_standard_type_id(BasicTypeDeclaration::BOOL, basic_left.size>>16);
 853                                 for(unsigned i=0; i<n_elems; ++i)
 854                                 {
 855                                         compare_id = write_expression(opcode, column_bvec_type_id, column_ids[i], column_ids[4+i]);
 856                                         column_ids[i] = write_expression(combine_op, result_type_id, compare_id);;
 857                                 }
 858
 859                                 compare_id = write_construct(bool_vec_type_id, column_ids, n_elems);
 860                         }
 861
 862                         if(compare_id)
 863                                 r_expression_result_id = write_expression(combine_op, result_type_id, compare_id);
 864                         return;
 865                 }
 866         }
 867         else if(oper2=='&' && elem.kind==BasicTypeDeclaration::BOOL)
 868                 opcode = OP_LOGICAL_AND;
 869         else if(oper2=='|' && elem.kind==BasicTypeDeclaration::BOOL)
 870                 opcode = OP_LOGICAL_OR;
 871         else if(oper2=='^' && elem.kind==BasicTypeDeclaration::BOOL)
 872                 opcode = OP_LOGICAL_NOT_EQUAL;
 873         else if(oper=='&' && elem.kind==BasicTypeDeclaration::INT)
 874                 opcode = OP_BITWISE_AND;
 875         else if(oper=='|' && elem.kind==BasicTypeDeclaration::INT)
 876                 opcode = OP_BITWISE_OR;
 877         else if(oper=='^' && elem.kind==BasicTypeDeclaration::INT)
 878                 opcode = OP_BITWISE_XOR;
 879         else if(oper=='<' && oper2==oper && elem.kind==BasicTypeDeclaration::INT)
 880                 opcode = OP_SHIFT_LEFT_LOGICAL;
 881         else if(oper=='>' && oper2==oper && elem.kind==BasicTypeDeclaration::INT)
 882                 opcode = OP_SHIFT_RIGHT_ARITHMETIC;
 883         else if(oper=='%' && elem.kind==BasicTypeDeclaration::INT)
 884                 opcode = (elem.sign ? OP_S_MOD : OP_U_MOD);
 885         else if(oper=='+' || oper=='-' || oper=='*' || oper=='/')
 886         {
 887                 Opcode elem_op = OP_NOP;
 888                 if(elem.kind==BasicTypeDeclaration::INT)
 889                 {
 890                         if(oper=='/')
 891                                 elem_op = (elem.sign ? OP_S_DIV : OP_U_DIV);
 892                         else
 893                                 elem_op = (oper=='+' ? OP_I_ADD : oper=='-' ? OP_I_SUB : OP_I_MUL);
 894                 }
 895                 else if(elem.kind==BasicTypeDeclaration::FLOAT)
 896                         elem_op = (oper=='+' ? OP_F_ADD : oper=='-' ? OP_F_SUB : oper=='*' ? OP_F_MUL : OP_F_DIV);
 897
 898                 if(oper=='*' && (basic_left.base_type || basic_right.base_type) && elem.kind==BasicTypeDeclaration::FLOAT)
 899                 {
 900                         /* Multiplication between floating-point vectors and matrices has
 901                         dedicated operations. */
 902                         if(basic_left.kind==BasicTypeDeclaration::MATRIX && basic_right.kind==BasicTypeDeclaration::MATRIX)
 903                                 opcode = OP_MATRIX_TIMES_MATRIX;
 904                         else if(basic_left.kind==BasicTypeDeclaration::MATRIX || basic_right.kind==BasicTypeDeclaration::MATRIX)
 905                         {
 906                                 if(basic_left.kind==BasicTypeDeclaration::VECTOR)
 907                                         opcode = OP_VECTOR_TIMES_MATRIX;
 908                                 else if(basic_right.kind==BasicTypeDeclaration::VECTOR)
 909                                         opcode = OP_MATRIX_TIMES_VECTOR;
 910                                 else
 911                                 {
 912                                         opcode = OP_MATRIX_TIMES_SCALAR;
 913                                         swap_operands = (basic_right.kind==BasicTypeDeclaration::MATRIX);
 914                                 }
 915                         }
 916                         else if(basic_left.kind==BasicTypeDeclaration::VECTOR && basic_right.kind==BasicTypeDeclaration::VECTOR)
 917                                 opcode = elem_op;
 918                         else
 919                         {
 920                                 opcode = OP_VECTOR_TIMES_SCALAR;
 921                                 swap_operands = (basic_right.kind==BasicTypeDeclaration::VECTOR);
 922                         }
 923                 }
 924                 else if((basic_left.base_type!=0)!=(basic_right.base_type!=0))
 925                 {
 926                         /* One operand is scalar and the other is a vector or a matrix.
 927                         Expand the scalar to a vector of appropriate size. */
 928                         Id &scalar_id = (basic_left.base_type ? right_id : left_id);
 929                         BasicTypeDeclaration *vector_type = (basic_left.base_type ? &basic_left : &basic_right);
 930                         if(vector_type->kind==BasicTypeDeclaration::MATRIX)
 931                                 vector_type = dynamic_cast<BasicTypeDeclaration *>(vector_type->base_type);
 932                         Id vector_type_id = get_id(*vector_type);
 933
 934                         Id expanded_id = begin_expression(OP_COMPOSITE_CONSTRUCT, vector_type_id, vector_type->size);
 935                         for(unsigned i=0; i<vector_type->size; ++i)
 936                                 writer.write(scalar_id);
 937                         end_expression(OP_COMPOSITE_CONSTRUCT);
 938
 939                         scalar_id = expanded_id;
 940
 941                         if(basic_left.kind==BasicTypeDeclaration::MATRIX || basic_right.kind==BasicTypeDeclaration::MATRIX)
 942                         {
 943                                 // Apply matrix operation column-wise.
 944                                 Id matrix_id = (basic_left.base_type ? left_id : right_id);
 945
 946                                 Id column_ids[4];
 947                                 unsigned n_columns = (basic_left.base_type ? basic_left.size : basic_right.size)&0xFFFF;
 948                                 write_deconstruct(vector_type_id, matrix_id, column_ids, n_columns);
 949
 950                                 for(unsigned i=0; i<n_columns; ++i)
 951                                         column_ids[i] = write_expression(elem_op, vector_type_id, column_ids[i], expanded_id);
 952
 953                                 r_expression_result_id = write_construct(result_type_id, column_ids, n_columns);
 954                                 return;
 955                         }
 956                         else
 957                                 opcode = elem_op;
 958                 }
 959                 else if(basic_left.kind==BasicTypeDeclaration::MATRIX && basic_right.kind==BasicTypeDeclaration::MATRIX)
 960                 {
 961                         if(oper=='*')
 962                                 throw internal_error("non-float matrix multiplication");
 963
 964                         /* Other operations involving matrices need to be performed
 965                         column-wise. */
 966                         Id column_type_id = get_id(*basic_left.base_type);
 967                         Id column_ids[8];
 968
 969                         unsigned n_columns = basic_left.size&0xFFFF;
 970                         write_deconstruct(column_type_id, left_id, column_ids, n_columns);
 971                         write_deconstruct(column_type_id, right_id, column_ids+4, n_columns);
 972
 973                         for(unsigned i=0; i<n_columns; ++i)
 974                                 column_ids[i] = write_expression(elem_op, column_type_id, column_ids[i], column_ids[4+i]);
 975
 976                         r_expression_result_id = write_construct(result_type_id, column_ids, n_columns);
 977                         return;
 978                 }
 979                 else if(basic_left.kind==basic_right.kind)
 980                         // Both operands are either scalars or vectors.
 981                         opcode = elem_op;
 982         }
 983
 984         if(opcode==OP_NOP)
 985                 throw internal_error("unknown binary operator");
 986
 987         if(swap_operands)
 988                 swap(left_id, right_id);
 989
 990         r_expression_result_id = write_expression(opcode, result_type_id, left_id, right_id);
 991 }
 992
 993 void SpirVGenerator::visit(Assignment &assign)
 994 {
 995         if(assign.oper->token[0]!='=')
 996                 visit(static_cast<BinaryExpression &>(assign));
 997         else
 998                 assign.right->visit(*this);
 999
1000         SetForScope<Id> set_assign(assignment_source_id, r_expression_result_id);
1001         assign.left->visit(*this);
1002         r_constant_result = false;
1003 }
1004
1005 void SpirVGenerator::visit(TernaryExpression &ternary)
1006 {
1007         if(composite_access)
1008                 return visit_isolated(ternary);
1009         if(constant_expression)
1010         {
1011                 ternary.condition->visit(*this);
1012                 Id condition_id = r_expression_result_id;
1013                 ternary.true_expr->visit(*this);
1014                 Id true_result_id = r_expression_result_id;
1015                 ternary.false_expr->visit(*this);
1016                 Id false_result_id = r_expression_result_id;
1017
1018                 r_expression_result_id = begin_expression(OP_SELECT, get_id(*ternary.type), 3);
1019                 writer.write(condition_id);
1020                 writer.write(true_result_id);
1021                 writer.write(false_result_id);
1022                 end_expression(OP_SELECT);
1023
1024                 return;
1025         }
1026
1027         ternary.condition->visit(*this);
1028         Id condition_id = r_expression_result_id;
1029
1030         Id true_label_id = next_id++;
1031         Id false_label_id = next_id++;
1032         Id merge_block_id = next_id++;
1033         writer.write_op(content.function_body, OP_SELECTION_MERGE, merge_block_id, 0);  // Selection control (none)
1034         writer.write_op(content.function_body, OP_BRANCH_CONDITIONAL, condition_id, true_label_id, false_label_id);
1035
1036         writer.write_op_label(true_label_id);
1037         ternary.true_expr->visit(*this);
1038         Id true_result_id = r_expression_result_id;
1039         true_label_id = writer.get_current_block();
1040         writer.write_op(content.function_body, OP_BRANCH, merge_block_id);
1041
1042         writer.write_op_label(false_label_id);
1043         ternary.false_expr->visit(*this);
1044         Id false_result_id = r_expression_result_id;
1045         false_label_id = writer.get_current_block();
1046
1047         writer.write_op_label(merge_block_id);
1048         r_expression_result_id = begin_expression(OP_PHI, get_id(*ternary.type), 4);
1049         writer.write(true_result_id);
1050         writer.write(true_label_id);
1051         writer.write(false_result_id);
1052         writer.write(false_label_id);
1053         end_expression(OP_PHI);
1054
1055         r_constant_result = false;
1056 }
1057
1058 void SpirVGenerator::visit(FunctionCall &call)
1059 {
1060         if(assignment_source_id)
1061                 throw internal_error("assignment to function call");
1062         else if(composite_access)
1063                 return visit_isolated(call);
1064         else if(call.constructor && call.arguments.size()==1 && call.arguments[0]->type==call.type)
1065                 return call.arguments[0]->visit(*this);
1066
1067         vector<Id> argument_ids;
1068         argument_ids.reserve(call.arguments.size());
1069         bool all_args_const = true;
1070         for(const RefPtr<Expression> &a: call.arguments)
1071         {
1072                 a->visit(*this);
1073                 argument_ids.push_back(r_expression_result_id);
1074                 all_args_const &= r_constant_result;
1075         }
1076
1077         if(constant_expression && (!call.constructor || !all_args_const))
1078                 throw internal_error("function call in constant expression");
1079
1080         Id result_type_id = get_id(*call.type);
1081         r_constant_result = false;
1082
1083         if(call.constructor)
1084                 visit_constructor(call, argument_ids, all_args_const);
1085         else if(call.declaration->source==BUILTIN_SOURCE)
1086         {
1087                 string arg_types;
1088                 for(const RefPtr<Expression> &a: call.arguments)
1089                         if(BasicTypeDeclaration *basic_arg = dynamic_cast<BasicTypeDeclaration *>(a->type))
1090                         {
1091                                 BasicTypeDeclaration &elem_arg = *get_element_type(*basic_arg);
1092                                 switch(elem_arg.kind)
1093                                 {
1094                                 case BasicTypeDeclaration::BOOL: arg_types += 'b'; break;
1095                                 case BasicTypeDeclaration::INT: arg_types += (elem_arg.sign ? 'i' : 'u'); break;
1096                                 case BasicTypeDeclaration::FLOAT: arg_types += 'f'; break;
1097                                 default: arg_types += '?';
1098                                 }
1099                         }
1100
1101                 const BuiltinFunctionInfo *builtin_info;
1102                 for(builtin_info=builtin_functions; builtin_info->function[0]; ++builtin_info)
1103                         if(builtin_info->function==call.name && (!builtin_info->arg_types[0] || builtin_info->arg_types==arg_types))
1104                                 break;
1105
1106                 if(builtin_info->capability)
1107                         use_capability(static_cast<Capability>(builtin_info->capability));
1108
1109                 if(builtin_info->opcode)
1110                 {
1111                         Opcode opcode;
1112                         if(builtin_info->extension[0])
1113                         {
1114                                 opcode = OP_EXT_INST;
1115                                 Id ext_id = import_extension(builtin_info->extension);
1116
1117                                 r_expression_result_id = begin_expression(opcode, result_type_id);
1118                                 writer.write(ext_id);
1119                                 writer.write(builtin_info->opcode);
1120                         }
1121                         else
1122                         {
1123                                 opcode = static_cast<Opcode>(builtin_info->opcode);
1124                                 r_expression_result_id = begin_expression(opcode, result_type_id);
1125                         }
1126
1127                         for(unsigned i=0; i<call.arguments.size(); ++i)
1128                         {
1129                                 if(!builtin_info->arg_order[i] || builtin_info->arg_order[i]>argument_ids.size())
1130                                         throw internal_error("invalid builtin function info");
1131                                 writer.write(argument_ids[builtin_info->arg_order[i]-1]);
1132                         }
1133
1134                         end_expression(opcode);
1135                 }
1136                 else if(builtin_info->handler)
1137                         (this->*(builtin_info->handler))(call, argument_ids);
1138                 else
1139                         throw internal_error("unknown builtin function "+call.name);
1140         }
1141         else
1142         {
1143                 r_expression_result_id = begin_expression(OP_FUNCTION_CALL, result_type_id, 1+call.arguments.size());
1144                 writer.write(get_id(*call.declaration->definition));
1145                 for(Id i: argument_ids)
1146                         writer.write(i);
1147                 end_expression(OP_FUNCTION_CALL);
1148
1149                 // Any global variables the called function uses might have changed value
1150                 set<Node *> dependencies = DependencyCollector().apply(*call.declaration->definition);
1151                 for(Node *n: dependencies)
1152                         if(const VariableDeclaration *var = dynamic_cast<const VariableDeclaration *>(n))
1153                                 variable_load_ids.erase(var);
1154         }
1155 }
1156
1157 void SpirVGenerator::visit_constructor(FunctionCall &call, const vector<Id> &argument_ids, bool all_args_const)
1158 {
1159         Id result_type_id = get_id(*call.type);
1160
1161         BasicTypeDeclaration *basic = dynamic_cast<BasicTypeDeclaration *>(call.type);
1162         if(!basic)
1163         {
1164                 if(dynamic_cast<const StructDeclaration *>(call.type))
1165                         r_expression_result_id = write_construct(result_type_id, &argument_ids[0], argument_ids.size());
1166                 else
1167                         throw internal_error("unconstructable type "+call.name);
1168                 return;
1169         }
1170
1171         SetFlag set_const(constant_expression, constant_expression || all_args_const);
1172
1173         BasicTypeDeclaration &elem = *get_element_type(*basic);
1174         BasicTypeDeclaration &basic_arg0 = dynamic_cast<BasicTypeDeclaration &>(*call.arguments[0]->type);
1175         BasicTypeDeclaration &elem_arg0 = *get_element_type(basic_arg0);
1176
1177         if(basic->kind==BasicTypeDeclaration::MATRIX)
1178         {
1179                 Id col_type_id = get_id(*basic->base_type);
1180                 unsigned n_columns = basic->size&0xFFFF;
1181                 unsigned n_rows = basic->size>>16;
1182
1183                 Id column_ids[4];
1184                 if(call.arguments.size()==1)
1185                 {
1186                         // Construct diagonal matrix from a single scalar.
1187                         Id zero_id = get_constant_id(get_id(elem), 0.0f);
1188                         for(unsigned i=0; i<n_columns; ++i)
1189                         {
1190                                 column_ids[i] = begin_expression(OP_COMPOSITE_CONSTRUCT, col_type_id, n_rows);
1191                                 for(unsigned j=0; j<n_rows; ++j)
1192                                         writer.write(j==i ? argument_ids[0] : zero_id);
1193                                 end_expression(OP_COMPOSITE_CONSTRUCT);
1194                         }
1195                 }
1196                 else
1197                         // Construct a matrix from column vectors
1198                         copy(argument_ids.begin(), argument_ids.begin()+n_columns, column_ids);
1199
1200                 r_expression_result_id = write_construct(result_type_id, column_ids, n_columns);
1201         }
1202         else if(basic->kind==BasicTypeDeclaration::VECTOR && (call.arguments.size()>1 || basic_arg0.kind!=BasicTypeDeclaration::VECTOR))
1203         {
1204                 /* There's either a single scalar argument or multiple arguments
1205                 which make up the vector's components. */
1206                 if(call.arguments.size()==1)
1207                 {
1208                         r_expression_result_id = begin_expression(OP_COMPOSITE_CONSTRUCT, result_type_id);
1209                         for(unsigned i=0; i<basic->size; ++i)
1210                                 writer.write(argument_ids[0]);
1211                         end_expression(OP_COMPOSITE_CONSTRUCT);
1212                 }
1213                 else
1214                         r_expression_result_id = write_construct(result_type_id, &argument_ids[0], argument_ids.size());
1215         }
1216         else if(elem.kind==BasicTypeDeclaration::BOOL)
1217         {
1218                 if(constant_expression)
1219                         throw internal_error("unconverted constant");
1220
1221                 // Conversion to boolean is implemented as comparing against zero.
1222                 Id number_type_id = get_id(elem_arg0);
1223                 Id zero_id = (elem_arg0.kind==BasicTypeDeclaration::FLOAT ?
1224                         get_constant_id(number_type_id, 0.0f) : get_constant_id(number_type_id, 0));
1225                 if(basic_arg0.kind==BasicTypeDeclaration::VECTOR)
1226                         zero_id = get_vector_constant_id(get_id(basic_arg0), basic_arg0.size, zero_id);
1227
1228                 Opcode opcode = (elem_arg0.kind==BasicTypeDeclaration::FLOAT ? OP_F_ORD_NOT_EQUAL : OP_I_NOT_EQUAL);
1229                 r_expression_result_id = write_expression(opcode, result_type_id, argument_ids[0], zero_id);
1230         }
1231         else if(elem_arg0.kind==BasicTypeDeclaration::BOOL)
1232         {
1233                 if(constant_expression)
1234                         throw internal_error("unconverted constant");
1235
1236                 /* Conversion from boolean is implemented as selecting from zero
1237                 or one. */
1238                 Id number_type_id = get_id(elem);
1239                 Id zero_id = (elem.kind==BasicTypeDeclaration::FLOAT ?
1240                         get_constant_id(number_type_id, 0.0f) : get_constant_id(number_type_id, 0));
1241                 Id one_id = (elem.kind==BasicTypeDeclaration::FLOAT ?
1242                         get_constant_id(number_type_id, 1.0f) : get_constant_id(number_type_id, 1));
1243                 if(basic->kind==BasicTypeDeclaration::VECTOR)
1244                 {
1245                         zero_id = get_vector_constant_id(get_id(*basic), basic->size, zero_id);
1246                         one_id = get_vector_constant_id(get_id(*basic), basic->size, one_id);
1247                 }
1248
1249                 r_expression_result_id = begin_expression(OP_SELECT, result_type_id, 3);
1250                 writer.write(argument_ids[0]);
1251                 writer.write(zero_id);
1252                 writer.write(one_id);
1253                 end_expression(OP_SELECT);
1254         }
1255         else
1256         {
1257                 if(constant_expression)
1258                         throw internal_error("unconverted constant");
1259
1260                 // Scalar or vector conversion between types of equal size.
1261                 Opcode opcode;
1262                 if(elem.kind==BasicTypeDeclaration::INT && elem_arg0.kind==BasicTypeDeclaration::FLOAT)
1263                         opcode = (elem.sign ? OP_CONVERT_F_TO_S : OP_CONVERT_F_TO_U);
1264                 else if(elem.kind==BasicTypeDeclaration::FLOAT && elem_arg0.kind==BasicTypeDeclaration::INT)
1265                         opcode = (elem_arg0.sign ? OP_CONVERT_S_TO_F : OP_CONVERT_U_TO_F);
1266                 else if(elem.kind==BasicTypeDeclaration::INT && elem_arg0.kind==BasicTypeDeclaration::INT)
1267                         opcode = OP_BITCAST;
1268                 else
1269                         throw internal_error("invalid conversion");
1270
1271                 r_expression_result_id = write_expression(opcode, result_type_id, argument_ids[0]);
1272         }
1273 }
1274
1275 void SpirVGenerator::visit_builtin_matrix_comp_mult(FunctionCall &call, const vector<Id> &argument_ids)
1276 {
1277         if(argument_ids.size()!=2)
1278                 throw internal_error("invalid matrixCompMult call");
1279
1280         const BasicTypeDeclaration &basic_arg0 = dynamic_cast<const BasicTypeDeclaration &>(*call.arguments[0]->type);
1281         Id column_type_id = get_id(*basic_arg0.base_type);
1282         Id column_ids[8];
1283
1284         unsigned n_columns = basic_arg0.size&0xFFFF;
1285         write_deconstruct(column_type_id, argument_ids[0], column_ids, n_columns);
1286         write_deconstruct(column_type_id, argument_ids[1], column_ids+4, n_columns);
1287
1288         for(unsigned i=0; i<n_columns; ++i)
1289                 column_ids[i] = write_expression(OP_F_MUL, column_type_id, column_ids[i], column_ids[4+i]);
1290
1291         r_expression_result_id = write_construct(get_id(*call.type), column_ids, n_columns);
1292 }
1293
1294 void SpirVGenerator::visit_builtin_texture_query(FunctionCall &call, const vector<Id> &argument_ids)
1295 {
1296         if(argument_ids.size()<1)
1297                 throw internal_error("invalid texture query call");
1298
1299         Opcode opcode;
1300         if(call.name=="textureSize")
1301                 opcode = OP_IMAGE_QUERY_SIZE_LOD;
1302         else if(call.name=="textureQueryLod")
1303                 opcode = OP_IMAGE_QUERY_LOD;
1304         else if(call.name=="textureQueryLevels")
1305                 opcode = OP_IMAGE_QUERY_LEVELS;
1306         else
1307                 throw internal_error("invalid texture query call");
1308
1309         ImageTypeDeclaration &image_arg0 = dynamic_cast<ImageTypeDeclaration &>(*call.arguments[0]->type);
1310
1311         Id image_id;
1312         if(image_arg0.sampled)
1313         {
1314                 Id image_type_id = get_item(image_type_ids, get_id(image_arg0));
1315                 image_id = write_expression(OP_IMAGE, image_type_id, argument_ids[0]);
1316         }
1317         else
1318                 image_id = argument_ids[0];
1319
1320         Id result_type_id = get_id(*call.type);
1321         r_expression_result_id = begin_expression(opcode, result_type_id, argument_ids.size());
1322         writer.write(image_id);
1323         for(unsigned i=1; i<argument_ids.size(); ++i)
1324                 writer.write(argument_ids[i]);
1325         end_expression(opcode);
1326 }
1327
1328 void SpirVGenerator::visit_builtin_texture(FunctionCall &call, const vector<Id> &argument_ids)
1329 {
1330         if(argument_ids.size()<2)
1331                 throw internal_error("invalid texture sampling call");
1332
1333         bool explicit_lod = (stage->type!=Stage::FRAGMENT || call.name=="textureLod");
1334         Id lod_id = (!explicit_lod ? 0 : call.name=="textureLod" ? argument_ids.back() :
1335                 get_constant_id(get_standard_type_id(BasicTypeDeclaration::FLOAT, 1), 0.0f));
1336
1337         const ImageTypeDeclaration &image = dynamic_cast<const ImageTypeDeclaration &>(*call.arguments[0]->type);
1338
1339         Opcode opcode;
1340         Id result_type_id = get_id(*call.type);
1341         Id dref_id = 0;
1342         if(image.shadow)
1343         {
1344                 if(argument_ids.size()==2)
1345                 {
1346                         const BasicTypeDeclaration &basic_arg1 = dynamic_cast<const BasicTypeDeclaration &>(*call.arguments[1]->type);
1347                         dref_id = begin_expression(OP_COMPOSITE_EXTRACT, get_id(*basic_arg1.base_type), 2);
1348                         writer.write(argument_ids.back());
1349                         writer.write(basic_arg1.size-1);
1350                         end_expression(OP_COMPOSITE_EXTRACT);
1351                 }
1352                 else
1353                         dref_id = argument_ids[2];
1354
1355                 opcode = (explicit_lod ? OP_IMAGE_SAMPLE_DREF_EXPLICIT_LOD : OP_IMAGE_SAMPLE_DREF_IMPLICIT_LOD);
1356                 r_expression_result_id = begin_expression(opcode, result_type_id, 3+explicit_lod*2);
1357         }
1358         else
1359         {
1360                 opcode = (explicit_lod ? OP_IMAGE_SAMPLE_EXPLICIT_LOD : OP_IMAGE_SAMPLE_IMPLICIT_LOD);
1361                 r_expression_result_id = begin_expression(opcode, result_type_id, 2+explicit_lod*2);
1362         }
1363
1364         for(unsigned i=0; i<2; ++i)
1365                 writer.write(argument_ids[i]);
1366         if(dref_id)
1367                 writer.write(dref_id);
1368         if(explicit_lod)
1369         {
1370                 writer.write(2);  // Lod
1371                 writer.write(lod_id);
1372         }
1373
1374         end_expression(opcode);
1375 }
1376
1377 void SpirVGenerator::visit_builtin_texel_fetch(FunctionCall &call, const vector<Id> &argument_ids)
1378 {
1379         if(argument_ids.size()!=3)
1380                 throw internal_error("invalid texelFetch call");
1381
1382         r_expression_result_id = begin_expression(OP_IMAGE_FETCH, get_id(*call.type), 4);
1383         for(unsigned i=0; i<2; ++i)
1384                 writer.write(argument_ids[i]);
1385         writer.write(2);  // Lod
1386         writer.write(argument_ids.back());
1387         end_expression(OP_IMAGE_FETCH);
1388 }
1389
1390 void SpirVGenerator::visit_builtin_interpolate(FunctionCall &call, const vector<Id> &argument_ids)
1391 {
1392         if(argument_ids.size()<1)
1393                 throw internal_error("invalid interpolate call");
1394         const VariableReference *var = dynamic_cast<const VariableReference *>(call.arguments[0].get());
1395         if(!var || !var->declaration || var->declaration->interface!="in")
1396                 throw internal_error("invalid interpolate call");
1397
1398         SpirVGlslStd450Opcode opcode;
1399         if(call.name=="interpolateAtCentroid")
1400                 opcode = GLSL450_INTERPOLATE_AT_CENTROID;
1401         else if(call.name=="interpolateAtSample")
1402                 opcode = GLSL450_INTERPOLATE_AT_SAMPLE;
1403         else if(call.name=="interpolateAtOffset")
1404                 opcode = GLSL450_INTERPOLATE_AT_OFFSET;
1405         else
1406                 throw internal_error("invalid interpolate call");
1407
1408         Id ext_id = import_extension("GLSL.std.450");
1409         r_expression_result_id = begin_expression(OP_EXT_INST, get_id(*call.type));
1410         writer.write(ext_id);
1411         writer.write(opcode);
1412         writer.write(get_id(*var->declaration));
1413         for(auto i=argument_ids.begin(); ++i!=argument_ids.end(); )
1414                 writer.write(*i);
1415         end_expression(OP_EXT_INST);
1416 }
1417
1418 void SpirVGenerator::visit(ExpressionStatement &expr)
1419 {
1420         expr.expression->visit(*this);
1421 }
1422
1423 void SpirVGenerator::visit(InterfaceLayout &layout)
1424 {
1425         interface_layouts.push_back(&layout);
1426 }
1427
1428 bool SpirVGenerator::check_duplicate_type(TypeDeclaration &type)
1429 {
1430         for(const auto &kvp: declared_ids)
1431                 if(TypeDeclaration *type2 = dynamic_cast<TypeDeclaration *>(kvp.first))
1432                         if(TypeComparer().apply(type, *type2))
1433                         {
1434                                 insert_unique(declared_ids, &type, kvp.second);
1435                                 return true;
1436                         }
1437
1438         return false;
1439 }
1440
1441 bool SpirVGenerator::check_standard_type(BasicTypeDeclaration &basic)
1442 {
1443         const BasicTypeDeclaration *elem = (basic.kind==BasicTypeDeclaration::VECTOR ?
1444                 dynamic_cast<const BasicTypeDeclaration *>(basic.base_type) : &basic);
1445         if(!elem || elem->base_type)
1446                 return false;
1447         if((elem->kind==BasicTypeDeclaration::INT || elem->kind==BasicTypeDeclaration::FLOAT) && elem->size!=32)
1448                 return false;
1449
1450         Id standard_id = get_standard_type_id(elem->kind, (basic.kind==BasicTypeDeclaration::VECTOR ? basic.size : 1), elem->sign);
1451         insert_unique(declared_ids, &basic, Declaration(standard_id, 0));
1452         writer.write_op_name(standard_id, basic.name);
1453
1454         return true;
1455 }
1456
1457 void SpirVGenerator::visit(BasicTypeDeclaration &basic)
1458 {
1459         if(check_standard_type(basic))
1460                 return;
1461         if(check_duplicate_type(basic))
1462                 return;
1463         // Alias types shouldn't exist at this point and arrays are handled elsewhere
1464         if(basic.kind==BasicTypeDeclaration::ALIAS || basic.kind==BasicTypeDeclaration::ARRAY)
1465                 return;
1466
1467         Id type_id = allocate_id(basic, 0);
1468         writer.write_op_name(type_id, basic.name);
1469
1470         switch(basic.kind)
1471         {
1472         case BasicTypeDeclaration::INT:
1473                 writer.write_op(content.globals, OP_TYPE_INT, type_id, basic.size, basic.sign);
1474                 break;
1475         case BasicTypeDeclaration::FLOAT:
1476                 writer.write_op(content.globals, OP_TYPE_FLOAT, type_id, basic.size);
1477                 break;
1478         case BasicTypeDeclaration::VECTOR:
1479                 writer.write_op(content.globals, OP_TYPE_VECTOR, type_id, get_id(*basic.base_type), basic.size);
1480                 break;
1481         case BasicTypeDeclaration::MATRIX:
1482                 writer.write_op(content.globals, OP_TYPE_MATRIX, type_id, get_id(*basic.base_type), basic.size&0xFFFF);
1483                 break;
1484         default:
1485                 throw internal_error("unknown basic type");
1486         }
1487 }
1488
1489 void SpirVGenerator::visit(ImageTypeDeclaration &image)
1490 {
1491         if(check_duplicate_type(image))
1492                 return;
1493
1494         Id type_id = allocate_id(image, 0);
1495
1496         Id image_id = (image.sampled ? next_id++ : type_id);
1497         writer.begin_op(content.globals, OP_TYPE_IMAGE, 9);
1498         writer.write(image_id);
1499         writer.write(get_id(*image.base_type));
1500         writer.write(image.dimensions-1);
1501         writer.write(image.shadow);
1502         writer.write(image.array);
1503         writer.write(false);  // Multisample
1504         writer.write(image.sampled ? 1 : 2);
1505         writer.write(0);  // Format (unknown)
1506         writer.end_op(OP_TYPE_IMAGE);
1507
1508         if(image.sampled)
1509         {
1510                 writer.write_op_name(type_id, image.name);
1511                 writer.write_op(content.globals, OP_TYPE_SAMPLED_IMAGE, type_id, image_id);
1512                 insert_unique(image_type_ids, type_id, image_id);
1513         }
1514
1515         if(image.dimensions==ImageTypeDeclaration::ONE)
1516                 use_capability(image.sampled ? CAP_SAMPLED_1D : CAP_IMAGE_1D);
1517         else if(image.dimensions==ImageTypeDeclaration::CUBE && image.array)
1518                 use_capability(image.sampled ? CAP_SAMPLED_CUBE_ARRAY : CAP_IMAGE_CUBE_ARRAY);
1519 }
1520
1521 void SpirVGenerator::visit(StructDeclaration &strct)
1522 {
1523         if(check_duplicate_type(strct))
1524                 return;
1525
1526         Id type_id = allocate_id(strct, 0);
1527         writer.write_op_name(type_id, strct.name);
1528
1529         if(strct.interface_block)
1530                 writer.write_op_decorate(type_id, DECO_BLOCK);
1531
1532         bool builtin = (strct.interface_block && !strct.interface_block->block_name.compare(0, 3, "gl_"));
1533         vector<Id> member_type_ids;
1534         member_type_ids.reserve(strct.members.body.size());
1535         for(const RefPtr<Statement> &s: strct.members.body)
1536         {
1537                 const VariableDeclaration *var = dynamic_cast<const VariableDeclaration *>(s.get());
1538                 if(!var)
1539                         continue;
1540
1541                 unsigned index = member_type_ids.size();
1542                 member_type_ids.push_back(get_variable_type_id(*var));
1543
1544                 writer.write_op_member_name(type_id, index, var->name);
1545
1546                 if(builtin)
1547                 {
1548                         BuiltinSemantic semantic = get_builtin_semantic(var->name);
1549                         writer.write_op_member_decorate(type_id, index, DECO_BUILTIN, semantic);
1550                 }
1551                 else
1552                 {
1553                         if(var->layout)
1554                         {
1555                                 for(const Layout::Qualifier &q: var->layout->qualifiers)
1556                                 {
1557                                         if(q.name=="offset")
1558                                                 writer.write_op_member_decorate(type_id, index, DECO_OFFSET, q.value);
1559                                         else if(q.name=="column_major")
1560                                                 writer.write_op_member_decorate(type_id, index, DECO_COL_MAJOR);
1561                                         else if(q.name=="row_major")
1562                                                 writer.write_op_member_decorate(type_id, index, DECO_ROW_MAJOR);
1563                                 }
1564                         }
1565
1566                         const BasicTypeDeclaration *basic = dynamic_cast<const BasicTypeDeclaration *>(var->type_declaration);
1567                         while(basic && basic->kind==BasicTypeDeclaration::ARRAY)
1568                                 basic = dynamic_cast<const BasicTypeDeclaration *>(basic->base_type);
1569                         if(basic && basic->kind==BasicTypeDeclaration::MATRIX)
1570                         {
1571                                 unsigned stride = MemoryRequirementsCalculator().apply(*basic->base_type).stride;
1572                                 writer.write_op_member_decorate(type_id, index, DECO_MATRIX_STRIDE, stride);
1573                         }
1574                 }
1575         }
1576
1577         writer.begin_op(content.globals, OP_TYPE_STRUCT);
1578         writer.write(type_id);
1579         for(Id i: member_type_ids)
1580                 writer.write(i);
1581         writer.end_op(OP_TYPE_STRUCT);
1582 }
1583
1584 void SpirVGenerator::visit(VariableDeclaration &var)
1585 {
1586         Id type_id = get_variable_type_id(var);
1587         Id var_id;
1588
1589         if(var.constant)
1590         {
1591                 if(!var.init_expression)
1592                         throw internal_error("const variable without initializer");
1593
1594                 int spec_id = get_layout_value(var.layout.get(), "constant_id");
1595                 Id *spec_var_id = (spec_id>=0 ? &declared_spec_ids[spec_id] : 0);
1596                 if(spec_id>=0 && *spec_var_id)
1597                 {
1598                         insert_unique(declared_ids, &var, Declaration(*spec_var_id, type_id));
1599                         return;
1600                 }
1601
1602                 SetFlag set_const(constant_expression);
1603                 SetFlag set_spec(spec_constant, spec_id>=0);
1604                 r_expression_result_id = 0;
1605                 var.init_expression->visit(*this);
1606                 var_id = r_expression_result_id;
1607                 insert_unique(declared_ids, &var, Declaration(var_id, type_id));
1608                 if(spec_id>=0)
1609                 {
1610                         writer.write_op_decorate(var_id, DECO_SPEC_ID, spec_id);
1611                         *spec_var_id = var_id;
1612                 }
1613         }
1614         else
1615         {
1616                 StorageClass storage = (current_function ? STORAGE_FUNCTION : get_interface_storage(var.interface, false));
1617                 Id ptr_type_id = get_pointer_type_id(type_id, storage);
1618                 if(var.interface=="uniform")
1619                 {
1620                         Id &uni_id = declared_uniform_ids["v"+var.name];
1621                         if(uni_id)
1622                         {
1623                                 insert_unique(declared_ids, &var, Declaration(uni_id, ptr_type_id));
1624                                 return;
1625                         }
1626
1627                         uni_id = var_id = allocate_id(var, ptr_type_id);
1628                 }
1629                 else
1630                         var_id = allocate_id(var, (var.constant ? type_id : ptr_type_id));
1631
1632                 Id init_id = 0;
1633                 if(var.init_expression)
1634                 {
1635                         SetFlag set_const(constant_expression, !current_function);
1636                         r_expression_result_id = 0;
1637                         r_constant_result = false;
1638                         var.init_expression->visit(*this);
1639                         init_id = r_expression_result_id;
1640                 }
1641
1642                 vector<Word> &target = (current_function ? content.locals : content.globals);
1643                 writer.begin_op(target, OP_VARIABLE, 4+(init_id && !current_function));
1644                 writer.write(ptr_type_id);
1645                 writer.write(var_id);
1646                 writer.write(storage);
1647                 if(init_id && !current_function)
1648                         writer.write(init_id);
1649                 writer.end_op(OP_VARIABLE);
1650
1651                 if(var.layout)
1652                 {
1653                         for(const Layout::Qualifier &q: var.layout->qualifiers)
1654                         {
1655                                 if(q.name=="location")
1656                                         writer.write_op_decorate(var_id, DECO_LOCATION, q.value);
1657                                 else if(q.name=="set")
1658                                         writer.write_op_decorate(var_id, DECO_DESCRIPTOR_SET, q.value);
1659                                 else if(q.name=="binding")
1660                                         writer.write_op_decorate(var_id, DECO_BINDING, q.value);
1661                         }
1662                 }
1663                 if(!var.name.compare(0, 3, "gl_"))
1664                 {
1665                         BuiltinSemantic semantic = get_builtin_semantic(var.name);
1666                         writer.write_op_decorate(var_id, DECO_BUILTIN, semantic);
1667                 }
1668
1669                 if(init_id && current_function)
1670                 {
1671                         writer.write_op(content.function_body, OP_STORE, var_id, init_id);
1672                         variable_load_ids[&var] = init_id;
1673                 }
1674         }
1675
1676         writer.write_op_name(var_id, var.name);
1677 }
1678
1679 void SpirVGenerator::visit(InterfaceBlock &iface)
1680 {
1681         bool push_const = has_layout_qualifier(iface.layout.get(), "push_constant");
1682
1683         StorageClass storage = (push_const ? STORAGE_PUSH_CONSTANT : get_interface_storage(iface.interface, true));
1684         Id type_id;
1685         if(iface.array)
1686                 type_id = get_array_type_id(*iface.struct_declaration, 0);
1687         else
1688                 type_id = get_id(*iface.struct_declaration);
1689         Id ptr_type_id = get_pointer_type_id(type_id, storage);
1690
1691         Id block_id;
1692         if(iface.interface=="uniform")
1693         {
1694                 Id &uni_id = declared_uniform_ids["b"+iface.block_name];
1695                 if(uni_id)
1696                 {
1697                         insert_unique(declared_ids, &iface, Declaration(uni_id, ptr_type_id));
1698                         return;
1699                 }
1700
1701                 uni_id = block_id = allocate_id(iface, ptr_type_id);
1702         }
1703         else
1704                 block_id = allocate_id(iface, ptr_type_id);
1705         writer.write_op_name(block_id, iface.instance_name);
1706
1707         writer.write_op(content.globals, OP_VARIABLE, ptr_type_id, block_id, storage);
1708
1709         if(iface.layout)
1710         {
1711                 for(const Layout::Qualifier &q: iface.layout->qualifiers)
1712                 {
1713                         if(q.name=="set")
1714                                 writer.write_op_decorate(block_id, DECO_DESCRIPTOR_SET, q.value);
1715                         else if(q.name=="binding")
1716                                 writer.write_op_decorate(block_id, DECO_BINDING, q.value);
1717                 }
1718         }
1719 }
1720
1721 void SpirVGenerator::visit_entry_point(FunctionDeclaration &func, Id func_id)
1722 {
1723         writer.begin_op(content.entry_points, OP_ENTRY_POINT);
1724         switch(stage->type)
1725         {
1726         case Stage::VERTEX: writer.write(0); break;
1727         case Stage::GEOMETRY: writer.write(3); break;
1728         case Stage::FRAGMENT: writer.write(4); break;
1729         default: throw internal_error("unknown stage");
1730         }
1731         writer.write(func_id);
1732         writer.write_string(func.name);
1733
1734         set<Node *> dependencies = DependencyCollector().apply(func);
1735         for(Node *n: dependencies)
1736         {
1737                 if(const VariableDeclaration *var = dynamic_cast<const VariableDeclaration *>(n))
1738                 {
1739                         if(!var->interface.empty())
1740                                 writer.write(get_id(*n));
1741                 }
1742                 else if(dynamic_cast<InterfaceBlock *>(n))
1743                         writer.write(get_id(*n));
1744         }
1745
1746         writer.end_op(OP_ENTRY_POINT);
1747
1748         if(stage->type==Stage::FRAGMENT)
1749         {
1750                 SpirVExecutionMode origin = (features.target_api==VULKAN ? EXEC_ORIGIN_UPPER_LEFT : EXEC_ORIGIN_LOWER_LEFT);
1751                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, origin);
1752         }
1753         else if(stage->type==Stage::GEOMETRY)
1754                 use_capability(CAP_GEOMETRY);
1755
1756         for(const InterfaceLayout *i: interface_layouts)
1757         {
1758                 for(const Layout::Qualifier &q: i->layout.qualifiers)
1759                 {
1760                         if(q.name=="point")
1761                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id,
1762                                         (i->interface=="in" ? EXEC_INPUT_POINTS : EXEC_OUTPUT_POINTS));
1763                         else if(q.name=="lines")
1764                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_INPUT_LINES);
1765                         else if(q.name=="lines_adjacency")
1766                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_INPUT_LINES_ADJACENCY);
1767                         else if(q.name=="triangles")
1768                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_TRIANGLES);
1769                         else if(q.name=="triangles_adjacency")
1770                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_INPUT_TRIANGLES_ADJACENCY);
1771                         else if(q.name=="line_strip")
1772                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_OUTPUT_LINE_STRIP);
1773                         else if(q.name=="triangle_strip")
1774                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_OUTPUT_TRIANGLE_STRIP);
1775                         else if(q.name=="max_vertices")
1776                                 writer.write_op(content.exec_modes, OP_EXECUTION_MODE, func_id, EXEC_OUTPUT_VERTICES, q.value);
1777                 }
1778         }
1779 }
1780
1781 void SpirVGenerator::visit(FunctionDeclaration &func)
1782 {
1783         if(func.source==BUILTIN_SOURCE)
1784                 return;
1785         else if(func.definition!=&func)
1786         {
1787                 if(func.definition)
1788                         allocate_forward_id(*func.definition);
1789                 return;
1790         }
1791
1792         Id return_type_id = get_id(*func.return_type_declaration);
1793         vector<unsigned> param_type_ids;
1794         param_type_ids.reserve(func.parameters.size());
1795         for(const RefPtr<VariableDeclaration> &p: func.parameters)
1796                 param_type_ids.push_back(get_variable_type_id(*p));
1797
1798         string sig_with_return = func.return_type+func.signature;
1799         Id &type_id = function_type_ids[sig_with_return];
1800         if(!type_id)
1801         {
1802                 type_id = next_id++;
1803                 writer.begin_op(content.globals, OP_TYPE_FUNCTION);
1804                 writer.write(type_id);
1805                 writer.write(return_type_id);
1806                 for(unsigned i: param_type_ids)
1807                         writer.write(i);
1808                 writer.end_op(OP_TYPE_FUNCTION);
1809
1810                 writer.write_op_name(type_id, sig_with_return);
1811         }
1812
1813         Id func_id = allocate_id(func, type_id);
1814         writer.write_op_name(func_id, func.name+func.signature);
1815
1816         if(func.name=="main")
1817                 visit_entry_point(func, func_id);
1818
1819         writer.begin_op(content.functions, OP_FUNCTION, 5);
1820         writer.write(return_type_id);
1821         writer.write(func_id);
1822         writer.write(0);  // Function control flags (none)
1823         writer.write(type_id);
1824         writer.end_op(OP_FUNCTION);
1825
1826         for(unsigned i=0; i<func.parameters.size(); ++i)
1827         {
1828                 Id param_id = allocate_id(*func.parameters[i], param_type_ids[i]);
1829                 writer.write_op(content.functions, OP_FUNCTION_PARAMETER, param_type_ids[i], param_id);
1830                 // TODO This is probably incorrect if the parameter is assigned to.
1831                 variable_load_ids[func.parameters[i].get()] = param_id;
1832         }
1833
1834         reachable = true;
1835         writer.begin_function_body(next_id++);
1836         SetForScope<FunctionDeclaration *> set_func(current_function, &func);
1837         func.body.visit(*this);
1838
1839         if(writer.get_current_block())
1840         {
1841                 if(!reachable)
1842                         writer.write_op(content.function_body, OP_UNREACHABLE);
1843                 else
1844                 {
1845                         const BasicTypeDeclaration *basic_return = dynamic_cast<const BasicTypeDeclaration *>(func.return_type_declaration);
1846                         if(basic_return && basic_return->kind==BasicTypeDeclaration::VOID)
1847                                 writer.write_op(content.function_body, OP_RETURN);
1848                         else
1849                                 throw internal_error("missing return in non-void function");
1850                 }
1851         }
1852         writer.end_function_body();
1853         variable_load_ids.clear();
1854 }
1855
1856 void SpirVGenerator::visit(Conditional &cond)
1857 {
1858         cond.condition->visit(*this);
1859
1860         Id true_label_id = next_id++;
1861         Id merge_block_id = next_id++;
1862         Id false_label_id = (cond.else_body.body.empty() ? merge_block_id : next_id++);
1863         writer.write_op(content.function_body, OP_SELECTION_MERGE, merge_block_id, 0);  // Selection control (none)
1864         writer.write_op(content.function_body, OP_BRANCH_CONDITIONAL, r_expression_result_id, true_label_id, false_label_id);
1865
1866         std::map<const VariableDeclaration *, Id> saved_load_ids = variable_load_ids;
1867
1868         writer.write_op_label(true_label_id);
1869         cond.body.visit(*this);
1870         if(writer.get_current_block())
1871                 writer.write_op(content.function_body, OP_BRANCH, merge_block_id);
1872
1873         bool reachable_if_true = reachable;
1874
1875         reachable = true;
1876         if(!cond.else_body.body.empty())
1877         {
1878                 swap(saved_load_ids, variable_load_ids);
1879                 writer.write_op_label(false_label_id);
1880                 cond.else_body.visit(*this);
1881                 reachable |= reachable_if_true;
1882         }
1883
1884         writer.write_op_label(merge_block_id);
1885         prune_loads(true_label_id);
1886 }
1887
1888 void SpirVGenerator::visit(Iteration &iter)
1889 {
1890         if(iter.init_statement)
1891                 iter.init_statement->visit(*this);
1892
1893         for(Node *n: AssignmentCollector().apply(iter))
1894                 if(VariableDeclaration *var = dynamic_cast<VariableDeclaration *>(n))
1895                         variable_load_ids.erase(var);
1896
1897         Id header_id = next_id++;
1898         Id continue_id = next_id++;
1899         Id merge_block_id = next_id++;
1900
1901         SetForScope<Id> set_merge(loop_merge_block_id, merge_block_id);
1902         SetForScope<Id> set_continue(loop_continue_target_id, continue_id);
1903
1904         writer.write_op_label(header_id);
1905         writer.write_op(content.function_body, OP_LOOP_MERGE, merge_block_id, continue_id, 0);  // Loop control (none)
1906
1907         Id body_id = next_id++;
1908         if(iter.condition)
1909         {
1910                 writer.write_op_label(next_id++);
1911                 iter.condition->visit(*this);
1912                 writer.write_op(content.function_body, OP_BRANCH_CONDITIONAL, r_expression_result_id, body_id, merge_block_id);
1913         }
1914
1915         writer.write_op_label(body_id);
1916         iter.body.visit(*this);
1917
1918         writer.write_op_label(continue_id);
1919         if(iter.loop_expression)
1920                 iter.loop_expression->visit(*this);
1921         writer.write_op(content.function_body, OP_BRANCH, header_id);
1922
1923         writer.write_op_label(merge_block_id);
1924         prune_loads(header_id);
1925         reachable = true;
1926 }
1927
1928 void SpirVGenerator::visit(Return &ret)
1929 {
1930         if(ret.expression)
1931         {
1932                 ret.expression->visit(*this);
1933                 writer.write_op(content.function_body, OP_RETURN_VALUE, r_expression_result_id);
1934         }
1935         else
1936                 writer.write_op(content.function_body, OP_RETURN);
1937         reachable = false;
1938 }
1939
1940 void SpirVGenerator::visit(Jump &jump)
1941 {
1942         if(jump.keyword=="discard")
1943                 writer.write_op(content.function_body, OP_KILL);
1944         else if(jump.keyword=="break")
1945                 writer.write_op(content.function_body, OP_BRANCH, loop_merge_block_id);
1946         else if(jump.keyword=="continue")
1947                 writer.write_op(content.function_body, OP_BRANCH, loop_continue_target_id);
1948         else
1949                 throw internal_error("unknown jump");
1950         reachable = false;
1951 }
1952
1953
1954 SpirVGenerator::TypeKey::TypeKey(BasicTypeDeclaration::Kind kind, bool sign):
1955         type_id(0)
1956 {
1957         switch(kind)
1958         {
1959         case BasicTypeDeclaration::VOID: detail = 'v'; break;
1960         case BasicTypeDeclaration::BOOL: detail = 'b'; break;
1961         case BasicTypeDeclaration::INT: detail = (sign ? 'i' : 'u'); break;
1962         case BasicTypeDeclaration::FLOAT: detail = 'f'; break;
1963         default: throw invalid_argument("TypeKey::TypeKey");
1964         }
1965 }
1966
1967 bool SpirVGenerator::TypeKey::operator<(const TypeKey &other) const
1968 {
1969         if(type_id!=other.type_id)
1970                 return type_id<other.type_id;
1971         return detail<other.detail;
1972 }
1973
1974
1975 bool SpirVGenerator::ConstantKey::operator<(const ConstantKey &other) const
1976 {
1977         if(type_id!=other.type_id)
1978                 return type_id<other.type_id;
1979         return int_value<other.int_value;
1980 }
1981
1982 } // namespace SL
1983 } // namespace GL
1984 } // namespace Msp