forked from unknownworlds/hlslparser
-
Notifications
You must be signed in to change notification settings - Fork 48
/
Copy pathGLSLGenerator.cpp
1920 lines (1711 loc) · 68.2 KB
/
GLSLGenerator.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
//=============================================================================
//
// Render/GLSLGenerator.cpp
//
// Created by Max McGuire ([email protected])
// Copyright (c) 2013, Unknown Worlds Entertainment, Inc.
//
//=============================================================================
#include "GLSLGenerator.h"
#include "HLSLParser.h"
#include "HLSLTree.h"
//#include "Engine/String.h"
//#include "Engine/Log.h"
#include "Engine.h"
#include <stdarg.h>
#include <string.h>
namespace M4
{
static const HLSLType kFloatType(HLSLBaseType_Float);
static const HLSLType kUintType(HLSLBaseType_Uint);
static const HLSLType kIntType(HLSLBaseType_Int);
static const HLSLType kBoolType(HLSLBaseType_Bool);
// These are reserved words in GLSL that aren't reserved in HLSL.
const char* GLSLGenerator::s_reservedWord[] =
{
"output",
"input",
"mod",
"mix",
"fract",
"dFdx",
"dFdy",
};
static const char* GetTypeName(const HLSLType& type)
{
switch (type.baseType)
{
case HLSLBaseType_Void: return "void";
case HLSLBaseType_Float: return "float";
case HLSLBaseType_Float2: return "vec2";
case HLSLBaseType_Float3: return "vec3";
case HLSLBaseType_Float4: return "vec4";
case HLSLBaseType_Float2x2: return "mat2";
case HLSLBaseType_Float3x3: return "mat3";
case HLSLBaseType_Float4x4: return "mat4";
case HLSLBaseType_Half: return "float";
case HLSLBaseType_Half2: return "vec2";
case HLSLBaseType_Half3: return "vec3";
case HLSLBaseType_Half4: return "vec4";
case HLSLBaseType_Half2x2: return "mat2";
case HLSLBaseType_Half3x3: return "mat3";
case HLSLBaseType_Half4x4: return "mat4";
case HLSLBaseType_Bool: return "bool";
case HLSLBaseType_Bool2: return "bvec2";
case HLSLBaseType_Bool3: return "bvec3";
case HLSLBaseType_Bool4: return "bvec4";
case HLSLBaseType_Int: return "int";
case HLSLBaseType_Int2: return "ivec2";
case HLSLBaseType_Int3: return "ivec3";
case HLSLBaseType_Int4: return "ivec4";
case HLSLBaseType_Uint: return "uint";
case HLSLBaseType_Uint2: return "uvec2";
case HLSLBaseType_Uint3: return "uvec3";
case HLSLBaseType_Uint4: return "uvec4";
case HLSLBaseType_Texture: return "texture";
case HLSLBaseType_Sampler: return "sampler";
case HLSLBaseType_Sampler2D: return "sampler2D";
case HLSLBaseType_Sampler3D: return "sampler3D";
case HLSLBaseType_SamplerCube: return "samplerCube";
case HLSLBaseType_Sampler2DMS: return "sampler2DMS";
case HLSLBaseType_Sampler2DArray: return "sampler2DArray";
case HLSLBaseType_UserDefined: return type.typeName;
default: return "?";
}
}
static bool GetCanImplicitCast(const HLSLType& srcType, const HLSLType& dstType)
{
return srcType.baseType == dstType.baseType;
}
static int GetFunctionArguments(HLSLFunctionCall* functionCall, HLSLExpression* expression[], int maxArguments)
{
HLSLExpression* argument = functionCall->argument;
int numArguments = 0;
while (argument != NULL)
{
if (numArguments < maxArguments)
{
expression[numArguments] = argument;
}
argument = argument->nextExpression;
++numArguments;
}
return numArguments;
}
GLSLGenerator::GLSLGenerator() :
m_writer(/* writeFileNames= */ false)
{
m_tree = NULL;
m_entryName = NULL;
m_target = Target_VertexShader;
m_version = Version_140;
m_versionLegacy = false;
m_inAttribPrefix = NULL;
m_outAttribPrefix = NULL;
m_error = false;
m_matrixRowFunction[0] = 0;
m_matrixCtorFunction[0] = 0;
m_matrixMulFunction[0] = 0;
m_clipFunction[0] = 0;
m_tex2DlodFunction[0] = 0;
m_tex2DbiasFunction[0] = 0;
m_tex3DlodFunction[0] = 0;
m_texCUBEbiasFunction[0] = 0;
m_texCUBElodFunction[ 0 ] = 0;
m_scalarSwizzle2Function[0] = 0;
m_scalarSwizzle3Function[0] = 0;
m_scalarSwizzle4Function[0] = 0;
m_sinCosFunction[0] = 0;
m_bvecTernary[ 0 ] = 0;
m_outputPosition = false;
m_outputTargets = 0;
}
bool GLSLGenerator::Generate(HLSLTree* tree, Target target, Version version, const char* entryName, const Options& options)
{
m_tree = tree;
m_entryName = entryName;
m_target = target;
m_version = version;
m_versionLegacy = (version == Version_110 || version == Version_100_ES);
m_options = options;
ChooseUniqueName("matrix_row", m_matrixRowFunction, sizeof(m_matrixRowFunction));
ChooseUniqueName("matrix_ctor", m_matrixCtorFunction, sizeof(m_matrixCtorFunction));
ChooseUniqueName("matrix_mul", m_matrixMulFunction, sizeof(m_matrixMulFunction));
ChooseUniqueName("clip", m_clipFunction, sizeof(m_clipFunction));
ChooseUniqueName("tex2Dlod", m_tex2DlodFunction, sizeof(m_tex2DlodFunction));
ChooseUniqueName("tex2Dbias", m_tex2DbiasFunction, sizeof(m_tex2DbiasFunction));
ChooseUniqueName("tex2Dgrad", m_tex2DgradFunction, sizeof(m_tex2DgradFunction));
ChooseUniqueName("tex3Dlod", m_tex3DlodFunction, sizeof(m_tex3DlodFunction));
ChooseUniqueName("texCUBEbias", m_texCUBEbiasFunction, sizeof(m_texCUBEbiasFunction));
ChooseUniqueName( "texCUBElod", m_texCUBElodFunction, sizeof( m_texCUBElodFunction ) );
for (int i = 0; i < s_numReservedWords; ++i)
{
ChooseUniqueName( s_reservedWord[i], m_reservedWord[i], sizeof(m_reservedWord[i]) );
}
ChooseUniqueName("m_scalar_swizzle2", m_scalarSwizzle2Function, sizeof(m_scalarSwizzle2Function));
ChooseUniqueName("m_scalar_swizzle3", m_scalarSwizzle3Function, sizeof(m_scalarSwizzle3Function));
ChooseUniqueName("m_scalar_swizzle4", m_scalarSwizzle4Function, sizeof(m_scalarSwizzle4Function));
ChooseUniqueName("sincos", m_sinCosFunction, sizeof(m_sinCosFunction));
ChooseUniqueName( "bvecTernary", m_bvecTernary, sizeof( m_bvecTernary ) );
if (target == Target_VertexShader)
{
m_inAttribPrefix = "";
m_outAttribPrefix = "frag_";
}
else
{
m_inAttribPrefix = "frag_";
m_outAttribPrefix = "rast_";
}
HLSLRoot* root = m_tree->GetRoot();
HLSLStatement* statement = root->statement;
// Find the entry point function.
HLSLFunction* entryFunction = FindFunction(root, m_entryName);
if (entryFunction == NULL)
{
Error("Entry point '%s' doesn't exist", m_entryName);
return false;
}
if (m_version == Version_110)
{
m_writer.WriteLine(0, "#version 110");
}
else if (m_version == Version_140)
{
m_writer.WriteLine(0, "#version 140");
// Pragmas for NVIDIA.
m_writer.WriteLine(0, "#pragma optionNV(fastmath on)");
//m_writer.WriteLine(0, "#pragma optionNV(fastprecision on)");
m_writer.WriteLine(0, "#pragma optionNV(ifcvt none)");
m_writer.WriteLine(0, "#pragma optionNV(inline all)");
m_writer.WriteLine(0, "#pragma optionNV(strict on)");
m_writer.WriteLine(0, "#pragma optionNV(unroll all)");
}
else if (m_version == Version_150)
{
m_writer.WriteLine(0, "#version 150");
}
else if (m_version == Version_100_ES)
{
m_writer.WriteLine(0, "#version 100");
m_writer.WriteLine(0, "precision highp float;");
}
else if (m_version == Version_300_ES)
{
m_writer.WriteLine(0, "#version 300 es");
m_writer.WriteLine(0, "precision highp float;");
}
else
{
Error("Unrecognized target version");
return false;
}
// Output the special function used to access rows in a matrix.
m_writer.WriteLine(0, "vec3 %s(mat3 m, int i) { return vec3( m[0][i], m[1][i], m[2][i] ); }", m_matrixRowFunction);
m_writer.WriteLine(0, "vec4 %s(mat4 m, int i) { return vec4( m[0][i], m[1][i], m[2][i], m[3][i] ); }", m_matrixRowFunction);
// Output the special function used to do matrix cast for OpenGL 2.0
if (m_version == Version_110)
{
m_writer.WriteLine(0, "mat3 %s(mat4 m) { return mat3(m[0][0], m[0][1], m[0][2], m[1][0], m[1][1], m[1][2], m[2][0], m[2][1], m[2][2]); }", m_matrixCtorFunction);
}
// Output the special functions used for matrix multiplication lowering
// They make sure glsl-optimizer can fold expressions better
if (m_tree->NeedsFunction("mul") && (m_options.flags & Flag_LowerMatrixMultiplication))
{
m_writer.WriteLine(0, "vec2 %s(mat2 m, vec2 v) { return m[0] * v.x + m[1] * v.y; }", m_matrixMulFunction);
m_writer.WriteLine(0, "vec2 %s(vec2 v, mat2 m) { return vec2(dot(m[0], v), dot(m[1], v)); }", m_matrixMulFunction);
m_writer.WriteLine(0, "vec3 %s(mat3 m, vec3 v) { return m[0] * v.x + m[1] * v.y + m[2] * v.z; }", m_matrixMulFunction);
m_writer.WriteLine(0, "vec3 %s(vec3 v, mat3 m) { return vec3(dot(m[0], v), dot(m[1], v), dot(m[2], v)); }", m_matrixMulFunction);
m_writer.WriteLine(0, "vec4 %s(mat4 m, vec4 v) { return m[0] * v.x + m[1] * v.y + m[2] * v.z + m[3] * v.w; }", m_matrixMulFunction);
m_writer.WriteLine(0, "vec4 %s(vec4 v, mat4 m) { return vec4(dot(m[0], v), dot(m[1], v), dot(m[2], v), dot(m[3], v)); }", m_matrixMulFunction);
}
// Output the special function used to emulate HLSL clip.
if (m_tree->NeedsFunction("clip"))
{
const char* discard = m_target == Target_FragmentShader ? "discard" : "";
m_writer.WriteLine(0, "void %s(float x) { if (x < 0.0) %s; }", m_clipFunction, discard);
m_writer.WriteLine(0, "void %s(vec2 x) { if (any(lessThan(x, vec2(0.0, 0.0)))) %s; }", m_clipFunction, discard);
m_writer.WriteLine(0, "void %s(vec3 x) { if (any(lessThan(x, vec3(0.0, 0.0, 0.0)))) %s; }", m_clipFunction, discard);
m_writer.WriteLine(0, "void %s(vec4 x) { if (any(lessThan(x, vec4(0.0, 0.0, 0.0, 0.0)))) %s; }", m_clipFunction, discard);
}
// Output the special function used to emulate tex2Dlod.
if (m_tree->NeedsFunction("tex2Dlod"))
{
const char* function = "textureLod";
if (m_version == Version_110)
{
m_writer.WriteLine(0, "#extension GL_ARB_shader_texture_lod : require");
function = "texture2DLod";
}
else if (m_version == Version_100_ES)
{
m_writer.WriteLine(0, "#extension GL_EXT_shader_texture_lod : require");
function = "texture2DLodEXT";
}
m_writer.WriteLine(0, "vec4 %s(sampler2D samp, vec4 texCoord) { return %s(samp, texCoord.xy, texCoord.w); }", m_tex2DlodFunction, function);
}
// Output the special function used to emulate tex2Dgrad.
if (m_tree->NeedsFunction("tex2Dgrad"))
{
const char* function = "textureGrad";
if (m_version == Version_110)
{
m_writer.WriteLine(0, "#extension GL_ARB_shader_texture_lod : require");
function = "texture2DGradARB";
}
else if (m_version == Version_100_ES)
{
m_writer.WriteLine(0, "#extension GL_EXT_shader_texture_lod : require");
function = "texture2DGradEXT";
}
m_writer.WriteLine(0, "vec4 %s(sampler2D samp, vec2 texCoord, vec2 dx, vec2 dy) { return %s(samp, texCoord, dx, dy); }", m_tex2DgradFunction, function);
}
// Output the special function used to emulate tex2Dbias.
if (m_tree->NeedsFunction("tex2Dbias"))
{
if (target == Target_FragmentShader)
{
m_writer.WriteLine(0, "vec4 %s(sampler2D samp, vec4 texCoord) { return %s(samp, texCoord.xy, texCoord.w); }", m_tex2DbiasFunction, m_versionLegacy ? "texture2D" : "texture" );
}
else
{
// Bias value is not supported in vertex shader.
m_writer.WriteLine(0, "vec4 %s(sampler2D samp, vec4 texCoord) { return texture(samp, texCoord.xy); }", m_tex2DbiasFunction );
}
}
// Output the special function used to emulate tex2DMSfetch.
if (m_tree->NeedsFunction("tex2DMSfetch"))
{
m_writer.WriteLine(0, "vec4 tex2DMSfetch(sampler2DMS samp, ivec2 texCoord, int sample) {");
m_writer.WriteLine(1, "return texelFetch(samp, texCoord, sample);");
m_writer.WriteLine(0, "}");
}
// Output the special function used to emulate tex3Dlod.
if (m_tree->NeedsFunction("tex3Dlod"))
{
m_writer.WriteLine(0, "vec4 %s(sampler3D samp, vec4 texCoord) { return %s(samp, texCoord.xyz, texCoord.w); }", m_tex3DlodFunction, m_versionLegacy ? "texture3D" : "texture" );
}
// Output the special function used to emulate texCUBEbias.
if (m_tree->NeedsFunction("texCUBEbias"))
{
if (target == Target_FragmentShader)
{
m_writer.WriteLine(0, "vec4 %s(samplerCube samp, vec4 texCoord) { return %s(samp, texCoord.xyz, texCoord.w); }", m_texCUBEbiasFunction, m_versionLegacy ? "textureCube" : "texture" );
}
else
{
// Bias value is not supported in vertex shader.
m_writer.WriteLine(0, "vec4 %s(samplerCube samp, vec4 texCoord) { return texture(samp, texCoord.xyz); }", m_texCUBEbiasFunction );
}
}
// Output the special function used to emulate texCUBElod
if (m_tree->NeedsFunction("texCUBElod"))
{
const char* function = "textureLod";
if (m_version == Version_110)
{
m_writer.WriteLine(0, "#extension GL_ARB_shader_texture_lod : require");
function = "textureCubeLod";
}
else if (m_version == Version_100_ES)
{
m_writer.WriteLine(0, "#extension GL_EXT_shader_texture_lod : require");
function = "textureCubeLodEXT";
}
m_writer.WriteLine( 0, "vec4 %s(samplerCube samp, vec4 texCoord) { return %s(samp, texCoord.xyz, texCoord.w); }", m_texCUBElodFunction, function);
}
m_writer.WriteLine(0, "vec2 %s(float x) { return vec2(x, x); }", m_scalarSwizzle2Function);
m_writer.WriteLine(0, "ivec2 %s(int x) { return ivec2(x, x); }", m_scalarSwizzle2Function);
m_writer.WriteLine(0, "vec3 %s(float x) { return vec3(x, x, x); }", m_scalarSwizzle3Function);
m_writer.WriteLine(0, "ivec3 %s(int x) { return ivec3(x, x, x); }", m_scalarSwizzle3Function);
m_writer.WriteLine(0, "vec4 %s(float x) { return vec4(x, x, x, x); }", m_scalarSwizzle4Function);
m_writer.WriteLine(0, "ivec4 %s(int x) { return ivec4(x, x, x, x); }", m_scalarSwizzle4Function);
if (!m_versionLegacy)
{
m_writer.WriteLine(0, "uvec2 %s(uint x) { return uvec2(x, x); }", m_scalarSwizzle2Function);
m_writer.WriteLine(0, "uvec3 %s(uint x) { return uvec3(x, x, x); }", m_scalarSwizzle3Function);
m_writer.WriteLine(0, "uvec4 %s(uint x) { return uvec4(x, x, x, x); }", m_scalarSwizzle4Function);
}
if (m_tree->NeedsFunction("sincos"))
{
const char* floatTypes[] = { "float", "vec2", "vec3", "vec4" };
for (int i = 0; i < 4; ++i)
{
m_writer.WriteLine(0, "void %s(%s x, out %s s, out %s c) { s = sin(x); c = cos(x); }", m_sinCosFunction,
floatTypes[i], floatTypes[i], floatTypes[i]);
}
}
// special function to emulate ?: with bool{2,3,4} condition type
m_writer.WriteLine( 0, "vec2 %s(bvec2 cond, vec2 trueExpr, vec2 falseExpr) { vec2 ret; ret.x = cond.x ? trueExpr.x : falseExpr.x; ret.y = cond.y ? trueExpr.y : falseExpr.y; return ret; }", m_bvecTernary );
m_writer.WriteLine( 0, "vec3 %s(bvec3 cond, vec3 trueExpr, vec3 falseExpr) { vec3 ret; ret.x = cond.x ? trueExpr.x : falseExpr.x; ret.y = cond.y ? trueExpr.y : falseExpr.y; ret.z = cond.z ? trueExpr.z : falseExpr.z; return ret; }", m_bvecTernary );
m_writer.WriteLine( 0, "vec4 %s(bvec4 cond, vec4 trueExpr, vec4 falseExpr) { vec4 ret; ret.x = cond.x ? trueExpr.x : falseExpr.x; ret.y = cond.y ? trueExpr.y : falseExpr.y; ret.z = cond.z ? trueExpr.z : falseExpr.z; ret.w = cond.w ? trueExpr.w : falseExpr.w; return ret; }", m_bvecTernary );
// Output the extension used for dFdx/dFdy in GLES2
if (m_version == Version_100_ES && (m_tree->NeedsFunction("ddx") || m_tree->NeedsFunction("ddy")))
{
m_writer.WriteLine(0, "#extension GL_OES_standard_derivatives : require");
}
OutputAttributes(entryFunction);
if (m_target == Target_FragmentShader)
{
if (!m_outputTargets)
Error("Fragment shader must output a color");
if (!m_versionLegacy)
m_writer.WriteLine(0, "out vec4 rast_FragData[%d];", m_outputTargets);
}
OutputStatements(0, statement);
OutputEntryCaller(entryFunction);
m_tree = NULL;
// The GLSL compilers don't check for this, so generate our own error message.
if (target == Target_VertexShader && !m_outputPosition)
{
Error("Vertex shader must output a position");
}
return !m_error;
}
const char* GLSLGenerator::GetResult() const
{
return m_writer.GetResult();
}
void GLSLGenerator::OutputExpressionList(HLSLExpression* expression, HLSLArgument* argument)
{
int numExpressions = 0;
while (expression != NULL)
{
if (numExpressions > 0)
{
m_writer.Write(", ");
}
HLSLType* expectedType = NULL;
if (argument != NULL)
{
expectedType = &argument->type;
argument = argument->nextArgument;
}
OutputExpression(expression, expectedType);
expression = expression->nextExpression;
++numExpressions;
}
}
const HLSLType* commonScalarType(const HLSLType& lhs, const HLSLType& rhs)
{
if (!IsScalarType(lhs) || !IsScalarType(rhs))
return NULL;
if (lhs.baseType == HLSLBaseType_Float || lhs.baseType == HLSLBaseType_Half ||
rhs.baseType == HLSLBaseType_Float || rhs.baseType == HLSLBaseType_Half)
return &kFloatType;
if (lhs.baseType == HLSLBaseType_Uint || rhs.baseType == HLSLBaseType_Uint)
return &kUintType;
if (lhs.baseType == HLSLBaseType_Int || rhs.baseType == HLSLBaseType_Int)
return &kIntType;
if (lhs.baseType == HLSLBaseType_Bool || rhs.baseType == HLSLBaseType_Bool)
return &kBoolType;
return NULL;
}
void GLSLGenerator::OutputExpression(HLSLExpression* expression, const HLSLType* dstType)
{
bool cast = dstType != NULL && !GetCanImplicitCast(expression->expressionType, *dstType);
if (expression->nodeType == HLSLNodeType_CastingExpression)
{
// No need to include a cast if the expression is already doing it.
cast = false;
}
if (cast)
{
OutputCast(*dstType);
m_writer.Write("(");
}
HLSLBuffer* bufferAccess = (m_options.flags & Flag_EmulateConstantBuffer) ? GetBufferAccessExpression(expression) : 0;
if (bufferAccess)
{
OutputBufferAccessExpression(bufferAccess, expression, expression->expressionType, 0);
}
else if (expression->nodeType == HLSLNodeType_IdentifierExpression)
{
HLSLIdentifierExpression* identifierExpression = static_cast<HLSLIdentifierExpression*>(expression);
OutputIdentifier(identifierExpression->name);
}
else if (expression->nodeType == HLSLNodeType_ConstructorExpression)
{
HLSLConstructorExpression* constructorExpression = static_cast<HLSLConstructorExpression*>(expression);
m_writer.Write("%s(", GetTypeName(constructorExpression->type));
OutputExpressionList(constructorExpression->argument);
m_writer.Write(")");
}
else if (expression->nodeType == HLSLNodeType_CastingExpression)
{
HLSLCastingExpression* castingExpression = static_cast<HLSLCastingExpression*>(expression);
OutputCast(castingExpression->type);
m_writer.Write("(");
OutputExpression(castingExpression->expression);
m_writer.Write(")");
}
else if (expression->nodeType == HLSLNodeType_LiteralExpression)
{
HLSLLiteralExpression* literalExpression = static_cast<HLSLLiteralExpression*>(expression);
switch (literalExpression->type)
{
case HLSLBaseType_Half:
case HLSLBaseType_Float:
{
// Don't use printf directly so that we don't use the system locale.
char buffer[64];
String_FormatFloat(buffer, sizeof(buffer), literalExpression->fValue);
m_writer.Write("%s", buffer);
}
break;
case HLSLBaseType_Int:
m_writer.Write("%d", literalExpression->iValue);
break;
case HLSLBaseType_Uint:
m_writer.Write("%uu", literalExpression->iValue);
break;
case HLSLBaseType_Bool:
m_writer.Write("%s", literalExpression->bValue ? "true" : "false");
break;
default:
ASSERT(0);
}
}
else if (expression->nodeType == HLSLNodeType_UnaryExpression)
{
HLSLUnaryExpression* unaryExpression = static_cast<HLSLUnaryExpression*>(expression);
const char* op = "?";
bool pre = true;
const HLSLType* dstType = NULL;
switch (unaryExpression->unaryOp)
{
case HLSLUnaryOp_Negative: op = "-"; break;
case HLSLUnaryOp_Positive: op = "+"; break;
case HLSLUnaryOp_Not: op = "!"; dstType = &unaryExpression->expressionType; break;
case HLSLUnaryOp_PreIncrement: op = "++"; break;
case HLSLUnaryOp_PreDecrement: op = "--"; break;
case HLSLUnaryOp_PostIncrement: op = "++"; pre = false; break;
case HLSLUnaryOp_PostDecrement: op = "--"; pre = false; break;
case HLSLUnaryOp_BitNot: op = "~"; break;
}
m_writer.Write("(");
if (pre)
{
m_writer.Write("%s", op);
OutputExpression(unaryExpression->expression, dstType);
}
else
{
OutputExpression(unaryExpression->expression, dstType);
m_writer.Write("%s", op);
}
m_writer.Write(")");
}
else if (expression->nodeType == HLSLNodeType_BinaryExpression)
{
HLSLBinaryExpression* binaryExpression = static_cast<HLSLBinaryExpression*>(expression);
const char* op = "?";
const HLSLType* dstType1 = NULL;
const HLSLType* dstType2 = NULL;
//
bool vectorExpression = IsVectorType( binaryExpression->expression1->expressionType ) || IsVectorType( binaryExpression->expression2->expressionType );
if( vectorExpression && IsCompareOp( binaryExpression->binaryOp ))
{
switch (binaryExpression->binaryOp)
{
case HLSLBinaryOp_Less: m_writer.Write("lessThan("); break;
case HLSLBinaryOp_Greater: m_writer.Write("greaterThan("); break;
case HLSLBinaryOp_LessEqual: m_writer.Write("lessThanEqual("); break;
case HLSLBinaryOp_GreaterEqual: m_writer.Write("greaterThanEqual("); break;
case HLSLBinaryOp_Equal: m_writer.Write("equal("); break;
case HLSLBinaryOp_NotEqual: m_writer.Write("notEqual("); break;
default:
ASSERT(0); // is so, check isCompareOp
}
if( IsVectorType( binaryExpression->expression1->expressionType ) && IsScalarType( binaryExpression->expression2->expressionType ) )
dstType2 = &binaryExpression->expression1->expressionType;
else if( IsScalarType( binaryExpression->expression1->expressionType ) && IsVectorType( binaryExpression->expression2->expressionType ) )
dstType1 = &binaryExpression->expression2->expressionType;
// TODO if both expressions are vector but with different dimension handle it here or in parser?
OutputExpression(binaryExpression->expression1, dstType1);
m_writer.Write(", ");
OutputExpression(binaryExpression->expression2, dstType2);
m_writer.Write(")");
}
else
{
switch (binaryExpression->binaryOp)
{
case HLSLBinaryOp_Add: op = " + "; dstType1 = dstType2 = &binaryExpression->expressionType; break;
case HLSLBinaryOp_Sub: op = " - "; dstType1 = dstType2 = &binaryExpression->expressionType; break;
case HLSLBinaryOp_Mul: op = " * "; dstType1 = dstType2 = &binaryExpression->expressionType; break;
case HLSLBinaryOp_Div: op = " / "; dstType1 = dstType2 = &binaryExpression->expressionType; break;
case HLSLBinaryOp_Less: op = " < "; dstType1 = dstType2 = commonScalarType(binaryExpression->expression1->expressionType, binaryExpression->expression2->expressionType); break;
case HLSLBinaryOp_Greater: op = " > "; dstType1 = dstType2 = commonScalarType(binaryExpression->expression1->expressionType, binaryExpression->expression2->expressionType); break;
case HLSLBinaryOp_LessEqual: op = " <= "; dstType1 = dstType2 = commonScalarType(binaryExpression->expression1->expressionType, binaryExpression->expression2->expressionType); break;
case HLSLBinaryOp_GreaterEqual: op = " >= "; dstType1 = dstType2 = commonScalarType(binaryExpression->expression1->expressionType, binaryExpression->expression2->expressionType); break;
case HLSLBinaryOp_Equal: op = " == "; dstType1 = dstType2 = commonScalarType(binaryExpression->expression1->expressionType, binaryExpression->expression2->expressionType); break;
case HLSLBinaryOp_NotEqual: op = " != "; dstType1 = dstType2 = commonScalarType(binaryExpression->expression1->expressionType, binaryExpression->expression2->expressionType); break;
case HLSLBinaryOp_Assign: op = " = "; dstType2 = &binaryExpression->expressionType; break;
case HLSLBinaryOp_AddAssign: op = " += "; dstType2 = &binaryExpression->expressionType; break;
case HLSLBinaryOp_SubAssign: op = " -= "; dstType2 = &binaryExpression->expressionType; break;
case HLSLBinaryOp_MulAssign: op = " *= "; dstType2 = &binaryExpression->expressionType; break;
case HLSLBinaryOp_DivAssign: op = " /= "; dstType2 = &binaryExpression->expressionType; break;
case HLSLBinaryOp_And: op = " && "; dstType1 = dstType2 = &binaryExpression->expressionType; break;
case HLSLBinaryOp_Or: op = " || "; dstType1 = dstType2 = &binaryExpression->expressionType; break;
case HLSLBinaryOp_BitAnd: op = " & "; dstType1 = dstType2 = commonScalarType(binaryExpression->expression1->expressionType, binaryExpression->expression2->expressionType); break;
case HLSLBinaryOp_BitOr: op = " | "; dstType1 = dstType2 = commonScalarType(binaryExpression->expression1->expressionType, binaryExpression->expression2->expressionType); break;
case HLSLBinaryOp_BitXor: op = " ^ "; dstType1 = dstType2 = commonScalarType(binaryExpression->expression1->expressionType, binaryExpression->expression2->expressionType); break;
default:
ASSERT(0);
}
m_writer.Write("(");
OutputExpression(binaryExpression->expression1, dstType1);
m_writer.Write("%s", op);
OutputExpression(binaryExpression->expression2, dstType2);
m_writer.Write(")");
}
}
else if (expression->nodeType == HLSLNodeType_ConditionalExpression)
{
HLSLConditionalExpression* conditionalExpression = static_cast<HLSLConditionalExpression*>(expression);
if( IsVectorType( conditionalExpression->condition->expressionType ) )
{
m_writer.Write( "%s", m_bvecTernary );
m_writer.Write( "( " );
OutputExpression( conditionalExpression->condition );
m_writer.Write( ", " );
OutputExpression( conditionalExpression->trueExpression, &conditionalExpression->expressionType );
m_writer.Write( ", " );
OutputExpression( conditionalExpression->falseExpression, &conditionalExpression->expressionType );
m_writer.Write( " )" );
}
else
{
m_writer.Write( "((" );
OutputExpression( conditionalExpression->condition, &kBoolType );
m_writer.Write( ")?(" );
OutputExpression( conditionalExpression->trueExpression, dstType );
m_writer.Write( "):(" );
OutputExpression( conditionalExpression->falseExpression, dstType );
m_writer.Write( "))" );
}
}
else if (expression->nodeType == HLSLNodeType_MemberAccess)
{
HLSLMemberAccess* memberAccess = static_cast<HLSLMemberAccess*>(expression);
if (memberAccess->object->expressionType.baseType == HLSLBaseType_Half ||
memberAccess->object->expressionType.baseType == HLSLBaseType_Float ||
memberAccess->object->expressionType.baseType == HLSLBaseType_Int ||
memberAccess->object->expressionType.baseType == HLSLBaseType_Uint)
{
// Handle swizzling on scalar values.
size_t swizzleLength = strlen(memberAccess->field);
if (swizzleLength == 2)
{
m_writer.Write("%s", m_scalarSwizzle2Function);
}
else if (swizzleLength == 3)
{
m_writer.Write("%s", m_scalarSwizzle3Function);
}
else if (swizzleLength == 4)
{
m_writer.Write("%s", m_scalarSwizzle4Function);
}
m_writer.Write("(");
OutputExpression(memberAccess->object);
m_writer.Write(")");
}
else
{
m_writer.Write("(");
OutputExpression(memberAccess->object);
m_writer.Write(")");
if( memberAccess->object->expressionType.baseType == HLSLBaseType_Float2x2 ||
memberAccess->object->expressionType.baseType == HLSLBaseType_Float3x3 ||
memberAccess->object->expressionType.baseType == HLSLBaseType_Float4x4 ||
memberAccess->object->expressionType.baseType == HLSLBaseType_Half2x2 ||
memberAccess->object->expressionType.baseType == HLSLBaseType_Half3x3 ||
memberAccess->object->expressionType.baseType == HLSLBaseType_Half4x4 )
{
// Handle HLSL matrix "swizzling".
// TODO: Properly handle multiple element selection such as _m00_m12
const char* n = memberAccess->field;
while (n[0] != 0)
{
if ( n[0] != '_' )
{
ASSERT(0);
break;
}
++n;
char base = '1';
if (n[0] == 'm')
{
base = '0';
++n;
}
if (isdigit(n[0]) && isdigit(n[1]) )
{
m_writer.Write("[%d][%d]", n[1] - base, n[0] - base);
n += 2;
}
else
{
ASSERT(0);
break;
}
}
}
else
{
m_writer.Write(".%s", memberAccess->field);
}
}
}
else if (expression->nodeType == HLSLNodeType_ArrayAccess)
{
HLSLArrayAccess* arrayAccess = static_cast<HLSLArrayAccess*>(expression);
if (!arrayAccess->array->expressionType.array &&
(arrayAccess->array->expressionType.baseType == HLSLBaseType_Float2x2 ||
arrayAccess->array->expressionType.baseType == HLSLBaseType_Float3x3 ||
arrayAccess->array->expressionType.baseType == HLSLBaseType_Float4x4 ||
arrayAccess->array->expressionType.baseType == HLSLBaseType_Half2x2 ||
arrayAccess->array->expressionType.baseType == HLSLBaseType_Half3x3 ||
arrayAccess->array->expressionType.baseType == HLSLBaseType_Half4x4 ) )
{
// GLSL access a matrix as m[c][r] while HLSL is m[r][c], so use our
// special row access function to convert.
m_writer.Write("%s(", m_matrixRowFunction);
OutputExpression(arrayAccess->array);
m_writer.Write(",");
OutputExpression(arrayAccess->index);
m_writer.Write(")");
}
else
{
OutputExpression(arrayAccess->array);
m_writer.Write("[");
OutputExpression(arrayAccess->index);
m_writer.Write("]");
}
}
else if (expression->nodeType == HLSLNodeType_FunctionCall)
{
HLSLFunctionCall* functionCall = static_cast<HLSLFunctionCall*>(expression);
// Handle intrinsic funtions that are different between HLSL and GLSL.
bool handled = false;
const char* functionName = functionCall->function->name;
if (String_Equal(functionName, "mul"))
{
HLSLExpression* argument[2];
if (GetFunctionArguments(functionCall, argument, 2) != 2)
{
Error("mul expects 2 arguments");
return;
}
const HLSLType& type0 = functionCall->function->argument->type;
const HLSLType& type1 = functionCall->function->argument->nextArgument->type;
const char* prefix = (m_options.flags & Flag_LowerMatrixMultiplication) ? m_matrixMulFunction : "";
const char* infix = (m_options.flags & Flag_LowerMatrixMultiplication) ? "," : "*";
if (m_options.flags & Flag_PackMatrixRowMajor)
{
m_writer.Write("%s((", prefix);
OutputExpression(argument[1], &type1);
m_writer.Write(")%s(", infix);
OutputExpression(argument[0], &type0);
m_writer.Write("))");
}
else
{
m_writer.Write("%s((", prefix);
OutputExpression(argument[0], &type0);
m_writer.Write(")%s(", infix);
OutputExpression(argument[1], &type1);
m_writer.Write("))");
}
handled = true;
}
else if (String_Equal(functionName, "saturate"))
{
HLSLExpression* argument[1];
if (GetFunctionArguments(functionCall, argument, 1) != 1)
{
Error("saturate expects 1 argument");
return;
}
m_writer.Write("clamp(");
OutputExpression(argument[0]);
m_writer.Write(", 0.0, 1.0)");
handled = true;
}
if (!handled)
{
OutputIdentifier(functionName);
m_writer.Write("(");
OutputExpressionList(functionCall->argument, functionCall->function->argument);
m_writer.Write(")");
}
}
else
{
m_writer.Write("<unknown expression>");
}
if (cast)
{
/*
const BaseTypeDescription& srcTypeDesc = _baseTypeDescriptions[expression->expressionType.baseType];
const BaseTypeDescription& dstTypeDesc = _baseTypeDescriptions[dstType->baseType];
if (dstTypeDesc.numDimensions == 1 && dstTypeDesc.numComponents > 1)
{
// Casting to a vector - pad with 0s
for (int i = srcTypeDesc.numComponents; i < dstTypeDesc.numComponents; ++i)
{
m_writer.Write(", 0");
}
}
*/
m_writer.Write(")");
}
}
void GLSLGenerator::OutputIdentifier(const char* name)
{
// Remap intrinstic functions.
if (String_Equal(name, "tex2D"))
{
name = m_versionLegacy ? "texture2D" : "texture";
}
else if (String_Equal(name, "tex2Dproj"))
{
name = m_versionLegacy ? "texture2DProj" : "textureProj";
}
else if (String_Equal(name, "texCUBE"))
{
name = m_versionLegacy ? "textureCube" : "texture";
}
else if (String_Equal(name, "tex3D"))
{
name = m_versionLegacy ? "texture3D" : "texture";
}
else if (String_Equal(name, "clip"))
{
name = m_clipFunction;
}
else if (String_Equal(name, "tex2Dlod"))
{
name = m_tex2DlodFunction;
}
else if (String_Equal(name, "tex2Dbias"))
{
name = m_tex2DbiasFunction;
}
else if (String_Equal(name, "tex2Dgrad"))
{
name = m_tex2DgradFunction;
}
else if (String_Equal(name, "tex2DArray"))
{
name = "texture";
}
else if (String_Equal(name, "texCUBEbias"))
{
name = m_texCUBEbiasFunction;
}
else if( String_Equal( name, "texCUBElod" ) )
{
name = m_texCUBElodFunction;
}
else if (String_Equal(name, "atan2"))
{
name = "atan";
}
else if (String_Equal(name, "sincos"))
{
name = m_sinCosFunction;
}
else if (String_Equal(name, "fmod"))
{
// mod is not the same as fmod if the parameter is negative!
// The equivalent of fmod(x, y) is x - y * floor(x/y)
// We use the mod version for performance.
name = "mod";
}
else if (String_Equal(name, "lerp"))
{
name = "mix";
}
else if (String_Equal(name, "frac"))
{
name = "fract";
}
else if (String_Equal(name, "ddx"))
{
name = "dFdx";
}
else if (String_Equal(name, "ddy"))
{
name = "dFdy";
}
else
{
// The identifier could be a GLSL reserved word (if it's not also a HLSL reserved word).
name = GetSafeIdentifierName(name);
}
m_writer.Write("%s", name);
}
void GLSLGenerator::OutputArguments(HLSLArgument* argument)
{
int numArgs = 0;
while (argument != NULL)
{
if (numArgs > 0)
{
m_writer.Write(", ");
}
switch (argument->modifier)
{
case HLSLArgumentModifier_In:
m_writer.Write("in ");
break;
case HLSLArgumentModifier_Out:
m_writer.Write("out ");
break;
case HLSLArgumentModifier_Inout:
m_writer.Write("inout ");
break;
default:
break;
}
OutputDeclaration(argument->type, argument->name);
argument = argument->nextArgument;
++numArgs;
}
}
void GLSLGenerator::OutputStatements(int indent, HLSLStatement* statement, const HLSLType* returnType)
{
while (statement != NULL)
{
if (statement->hidden)
{
statement = statement->nextStatement;
continue;
}
if (statement->nodeType == HLSLNodeType_Declaration)
{
HLSLDeclaration* declaration = static_cast<HLSLDeclaration*>(statement);
// GLSL doesn't seem have texture uniforms, so just ignore them.
if (declaration->type.baseType != HLSLBaseType_Texture)
{
m_writer.BeginLine(indent, declaration->fileName, declaration->line);
if (indent == 0)
{
// At the top level, we need the "uniform" keyword.
if ((declaration->type.flags & HLSLTypeFlag_Static) == 0)
m_writer.Write("uniform ");