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| 1 #include "GrBicubicEffect.h" |
| 2 |
| 3 #define DS(x) SkDoubleToScalar(x) |
| 4 |
| 5 const SkScalar GrBicubicEffect::gMitchellCoefficients[16] = { |
| 6 DS( 1.0 / 18.0), DS(-9.0 / 18.0), DS( 15.0 / 18.0), DS( -7.0 / 18.0), |
| 7 DS(16.0 / 18.0), DS( 0.0 / 18.0), DS(-36.0 / 18.0), DS( 21.0 / 18.0), |
| 8 DS( 1.0 / 18.0), DS( 9.0 / 18.0), DS( 27.0 / 18.0), DS(-21.0 / 18.0), |
| 9 DS( 0.0 / 18.0), DS( 0.0 / 18.0), DS( -6.0 / 18.0), DS( 7.0 / 18.0), |
| 10 }; |
| 11 |
| 12 |
| 13 class GrGLBicubicEffect : public GrGLEffect { |
| 14 public: |
| 15 GrGLBicubicEffect(const GrBackendEffectFactory& factory, |
| 16 const GrDrawEffect&); |
| 17 virtual void emitCode(GrGLShaderBuilder*, |
| 18 const GrDrawEffect&, |
| 19 EffectKey, |
| 20 const char* outputColor, |
| 21 const char* inputColor, |
| 22 const TextureSamplerArray&) SK_OVERRIDE; |
| 23 |
| 24 static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&); |
| 25 |
| 26 virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVER
RIDE; |
| 27 |
| 28 private: |
| 29 typedef GrGLUniformManager::UniformHandle UniformHandle; |
| 30 |
| 31 UniformHandle fCoefficientsUni; |
| 32 UniformHandle fImageIncrementUni; |
| 33 |
| 34 GrGLEffectMatrix fEffectMatrix; |
| 35 |
| 36 typedef GrGLEffect INHERITED; |
| 37 }; |
| 38 |
| 39 GrGLBicubicEffect::GrGLBicubicEffect(const GrBackendEffectFactory& factory, |
| 40 const GrDrawEffect& drawEffect) |
| 41 : INHERITED(factory) |
| 42 , fEffectMatrix(drawEffect.castEffect<GrBicubicEffect>().coordsType()) { |
| 43 } |
| 44 |
| 45 void GrGLBicubicEffect::emitCode(GrGLShaderBuilder* builder, |
| 46 const GrDrawEffect&, |
| 47 EffectKey key, |
| 48 const char* outputColor, |
| 49 const char* inputColor, |
| 50 const TextureSamplerArray& samplers) { |
| 51 SkString coords; |
| 52 fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, &coords); |
| 53 fCoefficientsUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibili
ty, |
| 54 kMat44f_GrSLType, "Coefficients"); |
| 55 fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibi
lity, |
| 56 kVec2f_GrSLType, "ImageIncrement"); |
| 57 |
| 58 const char* imgInc = builder->getUniformCStr(fImageIncrementUni); |
| 59 const char* coeff = builder->getUniformCStr(fCoefficientsUni); |
| 60 |
| 61 SkString cubicBlendName; |
| 62 |
| 63 static const GrGLShaderVar gCubicBlendArgs[] = { |
| 64 GrGLShaderVar("coefficients", kMat44f_GrSLType), |
| 65 GrGLShaderVar("t", kFloat_GrSLType), |
| 66 GrGLShaderVar("c0", kVec4f_GrSLType), |
| 67 GrGLShaderVar("c1", kVec4f_GrSLType), |
| 68 GrGLShaderVar("c2", kVec4f_GrSLType), |
| 69 GrGLShaderVar("c3", kVec4f_GrSLType), |
| 70 }; |
| 71 builder->fsEmitFunction(kVec4f_GrSLType, |
| 72 "cubicBlend", |
| 73 SK_ARRAY_COUNT(gCubicBlendArgs), |
| 74 gCubicBlendArgs, |
| 75 "\tvec4 ts = vec4(1.0, t, t * t, t * t * t);\n" |
| 76 "\tvec4 c = coefficients * ts;\n" |
| 77 "\treturn c.x * c0 + c.y * c1 + c.z * c2 + c.w * c3;
\n", |
| 78 &cubicBlendName); |
| 79 builder->fsCodeAppendf("\tvec2 coord = %s - %s * vec2(0.5, 0.5);\n", coords.
c_str(), imgInc); |
| 80 builder->fsCodeAppendf("\tvec2 f = fract(coord / %s);\n", imgInc); |
| 81 for (int y = 0; y < 4; ++y) { |
| 82 for (int x = 0; x < 4; ++x) { |
| 83 SkString coord; |
| 84 coord.printf("coord + %s * vec2(%d, %d)", imgInc, x - 1, y - 1); |
| 85 builder->fsCodeAppendf("\tvec4 s%d%d = ", x, y); |
| 86 builder->fsAppendTextureLookup(samplers[0], coord.c_str()); |
| 87 builder->fsCodeAppend(";\n"); |
| 88 } |
| 89 builder->fsCodeAppendf("\tvec4 s%d = %s(%s, f.x, s0%d, s1%d, s2%d, s3%d)
;\n", y, cubicBlendName.c_str(), coeff, y, y, y, y); |
| 90 } |
| 91 builder->fsCodeAppendf("\t%s = %s(%s, f.y, s0, s1, s2, s3);\n", outputColor,
cubicBlendName.c_str(), coeff); |
| 92 } |
| 93 |
| 94 GrGLEffect::EffectKey GrGLBicubicEffect::GenKey(const GrDrawEffect& drawEffect,
const GrGLCaps&) { |
| 95 const GrBicubicEffect& bicubic = drawEffect.castEffect<GrBicubicEffect>(); |
| 96 EffectKey matrixKey = GrGLEffectMatrix::GenKey(bicubic.getMatrix(), |
| 97 drawEffect, |
| 98 bicubic.coordsType(), |
| 99 bicubic.texture(0)); |
| 100 return matrixKey; |
| 101 } |
| 102 |
| 103 void GrGLBicubicEffect::setData(const GrGLUniformManager& uman, |
| 104 const GrDrawEffect& drawEffect) { |
| 105 const GrBicubicEffect& effect = drawEffect.castEffect<GrBicubicEffect>(); |
| 106 GrTexture& texture = *effect.texture(0); |
| 107 float imageIncrement[2]; |
| 108 imageIncrement[0] = 1.0f / texture.width(); |
| 109 imageIncrement[1] = 1.0f / texture.height(); |
| 110 uman.set2fv(fImageIncrementUni, 0, 1, imageIncrement); |
| 111 uman.setMatrix4f(fCoefficientsUni, effect.coefficients()); |
| 112 fEffectMatrix.setData(uman, |
| 113 effect.getMatrix(), |
| 114 drawEffect, |
| 115 effect.texture(0)); |
| 116 } |
| 117 |
| 118 GrBicubicEffect::GrBicubicEffect(GrTexture* texture, |
| 119 const SkScalar coefficients[16]) |
| 120 : INHERITED(texture, MakeDivByTextureWHMatrix(texture)) { |
| 121 for (int y = 0; y < 4; y++) { |
| 122 for (int x = 0; x < 4; x++) { |
| 123 // Convert from row-major scalars to column-major floats. |
| 124 fCoefficients[x * 4 + y] = SkScalarToFloat(coefficients[y * 4 + x]); |
| 125 } |
| 126 } |
| 127 } |
| 128 |
| 129 GrBicubicEffect::GrBicubicEffect(GrTexture* texture, |
| 130 const SkScalar coefficients[16], |
| 131 const SkMatrix &matrix, |
| 132 const GrTextureParams ¶ms, |
| 133 CoordsType coordsType) |
| 134 : INHERITED(texture, MakeDivByTextureWHMatrix(texture), params, coordsType) { |
| 135 for (int y = 0; y < 4; y++) { |
| 136 for (int x = 0; x < 4; x++) { |
| 137 // Convert from row-major scalars to column-major floats. |
| 138 fCoefficients[x * 4 + y] = SkScalarToFloat(coefficients[y * 4 + x]); |
| 139 } |
| 140 } |
| 141 } |
| 142 |
| 143 GrBicubicEffect::~GrBicubicEffect() { |
| 144 } |
| 145 |
| 146 const GrBackendEffectFactory& GrBicubicEffect::getFactory() const { |
| 147 return GrTBackendEffectFactory<GrBicubicEffect>::getInstance(); |
| 148 } |
| 149 |
| 150 bool GrBicubicEffect::onIsEqual(const GrEffect& sBase) const { |
| 151 const GrBicubicEffect& s = CastEffect<GrBicubicEffect>(sBase); |
| 152 return this->texture(0) == s.texture(0) && |
| 153 !memcmp(fCoefficients, s.coefficients(), 16); |
| 154 } |
| 155 |
| 156 void GrBicubicEffect::getConstantColorComponents(GrColor* color, uint32_t* valid
Flags) const { |
| 157 // FIXME: Perhaps we can do better. |
| 158 *validFlags = 0; |
| 159 return; |
| 160 } |
| 161 |
| 162 GR_DEFINE_EFFECT_TEST(GrBicubicEffect); |
| 163 |
| 164 GrEffectRef* GrBicubicEffect::TestCreate(SkMWCRandom* random, |
| 165 GrContext* context, |
| 166 const GrDrawTargetCaps&, |
| 167 GrTexture* textures[]) { |
| 168 int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx : |
| 169 GrEffectUnitTest::kAlphaTextureIdx; |
| 170 SkScalar coefficients[16]; |
| 171 for (int i = 0; i < 16; i++) { |
| 172 coefficients[i] = random->nextSScalar1(); |
| 173 } |
| 174 return GrBicubicEffect::Create(textures[texIdx], coefficients); |
| 175 } |
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