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1 /*
2  * Copyright 2013 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 "GrCustomCoordsTextureEffect.h"
9 #include "gl/builders/GrGLFullProgramBuilder.h"
10 #include "gl/GrGLProcessor.h"
11 #include "gl/GrGLSL.h"
12 #include "gl/GrGLTexture.h"
13 #include "gl/GrGLGeometryProcessor.h"
14 #include "GrTBackendProcessorFactory.h"
15 #include "GrTexture.h"
16 
17 class GrGLCustomCoordsTextureEffect : public GrGLGeometryProcessor {
18 public:
GrGLCustomCoordsTextureEffect(const GrBackendProcessorFactory & factory,const GrProcessor &)19     GrGLCustomCoordsTextureEffect(const GrBackendProcessorFactory& factory, const GrProcessor&)
20         : INHERITED (factory) {}
21 
emitCode(GrGLFullProgramBuilder * builder,const GrGeometryProcessor & geometryProcessor,const GrProcessorKey & key,const char * outputColor,const char * inputColor,const TransformedCoordsArray &,const TextureSamplerArray & samplers)22     virtual void emitCode(GrGLFullProgramBuilder* builder,
23                           const GrGeometryProcessor& geometryProcessor,
24                           const GrProcessorKey& key,
25                           const char* outputColor,
26                           const char* inputColor,
27                           const TransformedCoordsArray&,
28                           const TextureSamplerArray& samplers) SK_OVERRIDE {
29         const GrCustomCoordsTextureEffect& customCoordsTextureEffect =
30                 geometryProcessor.cast<GrCustomCoordsTextureEffect>();
31         SkASSERT(1 == customCoordsTextureEffect.getVertexAttribs().count());
32 
33         SkString fsCoordName;
34         const char* vsVaryingName;
35         const char* fsVaryingNamePtr;
36         builder->addVarying(kVec2f_GrSLType, "textureCoords", &vsVaryingName, &fsVaryingNamePtr);
37         fsCoordName = fsVaryingNamePtr;
38 
39         GrGLVertexShaderBuilder* vsBuilder = builder->getVertexShaderBuilder();
40         const GrShaderVar& inTextureCoords = customCoordsTextureEffect.inTextureCoords();
41         vsBuilder->codeAppendf("\t%s = %s;\n", vsVaryingName, inTextureCoords.c_str());
42 
43         GrGLProcessorFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder();
44         fsBuilder->codeAppendf("\t%s = ", outputColor);
45         fsBuilder->appendTextureLookupAndModulate(inputColor,
46                                                   samplers[0],
47                                                   fsCoordName.c_str(),
48                                                   kVec2f_GrSLType);
49         fsBuilder->codeAppend(";\n");
50     }
51 
setData(const GrGLProgramDataManager &,const GrProcessor &)52     virtual void setData(const GrGLProgramDataManager&,
53                          const GrProcessor&) SK_OVERRIDE {}
54 
55 private:
56     typedef GrGLGeometryProcessor INHERITED;
57 };
58 
59 ///////////////////////////////////////////////////////////////////////////////
60 
GrCustomCoordsTextureEffect(GrTexture * texture,const GrTextureParams & params)61 GrCustomCoordsTextureEffect::GrCustomCoordsTextureEffect(GrTexture* texture,
62                                                          const GrTextureParams& params)
63     : fTextureAccess(texture, params)
64     , fInTextureCoords(this->addVertexAttrib(GrShaderVar("inTextureCoords",
65                                                          kVec2f_GrSLType,
66                                                          GrShaderVar::kAttribute_TypeModifier))) {
67     this->addTextureAccess(&fTextureAccess);
68 }
69 
onIsEqual(const GrProcessor & other) const70 bool GrCustomCoordsTextureEffect::onIsEqual(const GrProcessor& other) const {
71     const GrCustomCoordsTextureEffect& cte = other.cast<GrCustomCoordsTextureEffect>();
72     return fTextureAccess == cte.fTextureAccess;
73 }
74 
getConstantColorComponents(GrColor * color,uint32_t * validFlags) const75 void GrCustomCoordsTextureEffect::getConstantColorComponents(GrColor* color,
76                                                              uint32_t* validFlags) const {
77     if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) &&
78         GrPixelConfigIsOpaque(this->texture(0)->config())) {
79         *validFlags = kA_GrColorComponentFlag;
80     } else {
81         *validFlags = 0;
82     }
83 }
84 
getFactory() const85 const GrBackendGeometryProcessorFactory& GrCustomCoordsTextureEffect::getFactory() const {
86     return GrTBackendGeometryProcessorFactory<GrCustomCoordsTextureEffect>::getInstance();
87 }
88 
89 ///////////////////////////////////////////////////////////////////////////////
90 
91 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrCustomCoordsTextureEffect);
92 
TestCreate(SkRandom * random,GrContext *,const GrDrawTargetCaps &,GrTexture * textures[])93 GrGeometryProcessor* GrCustomCoordsTextureEffect::TestCreate(SkRandom* random,
94                                                              GrContext*,
95                                                              const GrDrawTargetCaps&,
96                                                              GrTexture* textures[]) {
97     int texIdx = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx :
98                                       GrProcessorUnitTest::kAlphaTextureIdx;
99     static const SkShader::TileMode kTileModes[] = {
100         SkShader::kClamp_TileMode,
101         SkShader::kRepeat_TileMode,
102         SkShader::kMirror_TileMode,
103     };
104     SkShader::TileMode tileModes[] = {
105         kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))],
106         kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))],
107     };
108     GrTextureParams params(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode :
109                                                            GrTextureParams::kNone_FilterMode);
110 
111     return GrCustomCoordsTextureEffect::Create(textures[texIdx], params);
112 }
113