1 /*
2 * Copyright 2014 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "GrGLFragmentOnlyProgramBuilder.h"
9 #include "../GrGpuGL.h"
10
GrGLFragmentOnlyProgramBuilder(GrGpuGL * gpu,const GrGLProgramDesc & desc)11 GrGLFragmentOnlyProgramBuilder::GrGLFragmentOnlyProgramBuilder(GrGpuGL* gpu,
12 const GrGLProgramDesc& desc)
13 : INHERITED(gpu, desc) {
14 SkASSERT(desc.getHeader().fUseFragShaderOnly);
15 SkASSERT(gpu->glCaps().pathRenderingSupport());
16 SkASSERT(GrGLProgramDesc::kAttribute_ColorInput != desc.getHeader().fColorInput);
17 SkASSERT(GrGLProgramDesc::kAttribute_ColorInput != desc.getHeader().fCoverageInput);
18 }
19
addTexCoordSets(int count)20 int GrGLFragmentOnlyProgramBuilder::addTexCoordSets(int count) {
21 int firstFreeCoordSet = fTexCoordSetCnt;
22 fTexCoordSetCnt += count;
23 SkASSERT(gpu()->glCaps().maxFixedFunctionTextureCoords() >= fTexCoordSetCnt);
24 return firstFreeCoordSet;
25 }
26
27 void
createAndEmitEffects(const GrGeometryStage * geometryProcessor,const GrFragmentStage * colorStages[],const GrFragmentStage * coverageStages[],GrGLSLExpr4 * inputColor,GrGLSLExpr4 * inputCoverage)28 GrGLFragmentOnlyProgramBuilder::createAndEmitEffects(const GrGeometryStage* geometryProcessor,
29 const GrFragmentStage* colorStages[],
30 const GrFragmentStage* coverageStages[],
31 GrGLSLExpr4* inputColor,
32 GrGLSLExpr4* inputCoverage) {
33 ///////////////////////////////////////////////////////////////////////////
34 // emit the per-effect code for both color and coverage effects
35
36 EffectKeyProvider colorKeyProvider(&this->desc(), EffectKeyProvider::kColor_EffectType);
37 fColorEffects.reset(this->onCreateAndEmitEffects(colorStages,
38 this->desc().numColorEffects(),
39 colorKeyProvider,
40 inputColor));
41
42 EffectKeyProvider coverageKeyProvider(&this->desc(), EffectKeyProvider::kCoverage_EffectType);
43 fCoverageEffects.reset(this->onCreateAndEmitEffects(coverageStages,
44 this->desc().numCoverageEffects(),
45 coverageKeyProvider,
46 inputCoverage));
47 }
48
onCreateAndEmitEffects(const GrFragmentStage * effectStages[],int effectCnt,const GrGLProgramDesc::EffectKeyProvider & keyProvider,GrGLSLExpr4 * inOutFSColor)49 GrGLProgramEffects* GrGLFragmentOnlyProgramBuilder::onCreateAndEmitEffects(
50 const GrFragmentStage* effectStages[], int effectCnt,
51 const GrGLProgramDesc::EffectKeyProvider& keyProvider, GrGLSLExpr4* inOutFSColor) {
52 fProgramEffects.reset(SkNEW_ARGS(GrGLPathTexGenProgramEffects, (effectCnt)));
53 this->INHERITED::createAndEmitEffects(effectStages,
54 effectCnt,
55 keyProvider,
56 inOutFSColor);
57 return fProgramEffects.detach();
58 }
59
emitEffect(const GrProcessorStage & stage,const GrProcessorKey & key,const char * outColor,const char * inColor,int stageIndex)60 void GrGLFragmentOnlyProgramBuilder::emitEffect(const GrProcessorStage& stage,
61 const GrProcessorKey& key,
62 const char* outColor,
63 const char* inColor,
64 int stageIndex) {
65 SkASSERT(fProgramEffects.get());
66 const GrProcessor& effect = *stage.getProcessor();
67
68 SkSTArray<2, GrGLProcessor::TransformedCoords> coords(effect.numTransforms());
69 SkSTArray<4, GrGLProcessor::TextureSampler> samplers(effect.numTextures());
70
71 this->setupPathTexGen(stage, &coords);
72 this->emitSamplers(effect, &samplers);
73
74 SkASSERT(fEffectEmitter);
75 GrGLProcessor* glEffect = fEffectEmitter->createGLInstance();
76 fProgramEffects->addEffect(glEffect);
77
78 GrGLFragmentShaderBuilder* fsBuilder = this->getFragmentShaderBuilder();
79 // Enclose custom code in a block to avoid namespace conflicts
80 SkString openBrace;
81 openBrace.printf("\t{ // Stage %d: %s\n", stageIndex, glEffect->name());
82 fsBuilder->codeAppend(openBrace.c_str());
83
84 fEffectEmitter->emit(key, outColor, inColor, coords, samplers);
85
86 fsBuilder->codeAppend("\t}\n");
87 }
88
setupPathTexGen(const GrProcessorStage & effectStage,GrGLProcessor::TransformedCoordsArray * outCoords)89 void GrGLFragmentOnlyProgramBuilder::setupPathTexGen(
90 const GrProcessorStage& effectStage, GrGLProcessor::TransformedCoordsArray* outCoords) {
91 int numTransforms = effectStage.getProcessor()->numTransforms();
92 int texCoordIndex = this->addTexCoordSets(numTransforms);
93
94 fProgramEffects->addTransforms(texCoordIndex);
95
96 SkString name;
97 for (int t = 0; t < numTransforms; ++t) {
98 GrSLType type =
99 effectStage.isPerspectiveCoordTransform(t, false) ?
100 kVec3f_GrSLType :
101 kVec2f_GrSLType;
102
103 name.printf("%s(gl_TexCoord[%i])", GrGLSLTypeString(type), texCoordIndex++);
104 SkNEW_APPEND_TO_TARRAY(outCoords, GrGLProcessor::TransformedCoords, (name, type));
105 }
106 }
107