| #include "GrBicubicEffect.h" |
| |
| #define DS(x) SkDoubleToScalar(x) |
| |
| const SkScalar GrBicubicEffect::gMitchellCoefficients[16] = { |
| DS( 1.0 / 18.0), DS(-9.0 / 18.0), DS( 15.0 / 18.0), DS( -7.0 / 18.0), |
| DS(16.0 / 18.0), DS( 0.0 / 18.0), DS(-36.0 / 18.0), DS( 21.0 / 18.0), |
| DS( 1.0 / 18.0), DS( 9.0 / 18.0), DS( 27.0 / 18.0), DS(-21.0 / 18.0), |
| DS( 0.0 / 18.0), DS( 0.0 / 18.0), DS( -6.0 / 18.0), DS( 7.0 / 18.0), |
| }; |
| |
| |
| class GrGLBicubicEffect : public GrGLEffect { |
| public: |
| GrGLBicubicEffect(const GrBackendEffectFactory& factory, |
| const GrDrawEffect&); |
| virtual void emitCode(GrGLShaderBuilder*, |
| const GrDrawEffect&, |
| EffectKey, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray&, |
| const TextureSamplerArray&) SK_OVERRIDE; |
| |
| virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; |
| |
| private: |
| typedef GrGLUniformManager::UniformHandle UniformHandle; |
| |
| UniformHandle fCoefficientsUni; |
| UniformHandle fImageIncrementUni; |
| |
| typedef GrGLEffect INHERITED; |
| }; |
| |
| GrGLBicubicEffect::GrGLBicubicEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&) |
| : INHERITED(factory) { |
| } |
| |
| void GrGLBicubicEffect::emitCode(GrGLShaderBuilder* builder, |
| const GrDrawEffect&, |
| EffectKey key, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray& coords, |
| const TextureSamplerArray& samplers) { |
| sk_ignore_unused_variable(inputColor); |
| |
| SkString coords2D = builder->ensureFSCoords2D(coords, 0); |
| fCoefficientsUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, |
| kMat44f_GrSLType, "Coefficients"); |
| fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, |
| kVec2f_GrSLType, "ImageIncrement"); |
| |
| const char* imgInc = builder->getUniformCStr(fImageIncrementUni); |
| const char* coeff = builder->getUniformCStr(fCoefficientsUni); |
| |
| SkString cubicBlendName; |
| |
| static const GrGLShaderVar gCubicBlendArgs[] = { |
| GrGLShaderVar("coefficients", kMat44f_GrSLType), |
| GrGLShaderVar("t", kFloat_GrSLType), |
| GrGLShaderVar("c0", kVec4f_GrSLType), |
| GrGLShaderVar("c1", kVec4f_GrSLType), |
| GrGLShaderVar("c2", kVec4f_GrSLType), |
| GrGLShaderVar("c3", kVec4f_GrSLType), |
| }; |
| builder->fsEmitFunction(kVec4f_GrSLType, |
| "cubicBlend", |
| SK_ARRAY_COUNT(gCubicBlendArgs), |
| gCubicBlendArgs, |
| "\tvec4 ts = vec4(1.0, t, t * t, t * t * t);\n" |
| "\tvec4 c = coefficients * ts;\n" |
| "\treturn c.x * c0 + c.y * c1 + c.z * c2 + c.w * c3;\n", |
| &cubicBlendName); |
| builder->fsCodeAppendf("\tvec2 coord = %s - %s * vec2(0.5, 0.5);\n", coords2D.c_str(), imgInc); |
| builder->fsCodeAppendf("\tvec2 f = fract(coord / %s);\n", imgInc); |
| for (int y = 0; y < 4; ++y) { |
| for (int x = 0; x < 4; ++x) { |
| SkString coord; |
| coord.printf("coord + %s * vec2(%d, %d)", imgInc, x - 1, y - 1); |
| builder->fsCodeAppendf("\tvec4 s%d%d = ", x, y); |
| builder->fsAppendTextureLookup(samplers[0], coord.c_str()); |
| builder->fsCodeAppend(";\n"); |
| } |
| 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); |
| } |
| builder->fsCodeAppendf("\t%s = %s(%s, f.y, s0, s1, s2, s3);\n", outputColor, cubicBlendName.c_str(), coeff); |
| } |
| |
| void GrGLBicubicEffect::setData(const GrGLUniformManager& uman, |
| const GrDrawEffect& drawEffect) { |
| const GrBicubicEffect& effect = drawEffect.castEffect<GrBicubicEffect>(); |
| GrTexture& texture = *effect.texture(0); |
| float imageIncrement[2]; |
| imageIncrement[0] = 1.0f / texture.width(); |
| imageIncrement[1] = 1.0f / texture.height(); |
| uman.set2fv(fImageIncrementUni, 0, 1, imageIncrement); |
| uman.setMatrix4f(fCoefficientsUni, effect.coefficients()); |
| } |
| |
| GrBicubicEffect::GrBicubicEffect(GrTexture* texture, |
| const SkScalar coefficients[16]) |
| : INHERITED(texture, MakeDivByTextureWHMatrix(texture)) { |
| for (int y = 0; y < 4; y++) { |
| for (int x = 0; x < 4; x++) { |
| // Convert from row-major scalars to column-major floats. |
| fCoefficients[x * 4 + y] = SkScalarToFloat(coefficients[y * 4 + x]); |
| } |
| } |
| this->setWillNotUseInputColor(); |
| } |
| |
| GrBicubicEffect::GrBicubicEffect(GrTexture* texture, |
| const SkScalar coefficients[16], |
| const SkMatrix &matrix, |
| const GrTextureParams ¶ms, |
| GrCoordSet coordSet) |
| : INHERITED(texture, MakeDivByTextureWHMatrix(texture), params, coordSet) { |
| for (int y = 0; y < 4; y++) { |
| for (int x = 0; x < 4; x++) { |
| // Convert from row-major scalars to column-major floats. |
| fCoefficients[x * 4 + y] = SkScalarToFloat(coefficients[y * 4 + x]); |
| } |
| } |
| this->setWillNotUseInputColor(); |
| } |
| |
| GrBicubicEffect::~GrBicubicEffect() { |
| } |
| |
| const GrBackendEffectFactory& GrBicubicEffect::getFactory() const { |
| return GrTBackendEffectFactory<GrBicubicEffect>::getInstance(); |
| } |
| |
| bool GrBicubicEffect::onIsEqual(const GrEffect& sBase) const { |
| const GrBicubicEffect& s = CastEffect<GrBicubicEffect>(sBase); |
| return this->textureAccess(0) == s.textureAccess(0) && |
| !memcmp(fCoefficients, s.coefficients(), 16); |
| } |
| |
| void GrBicubicEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const { |
| // FIXME: Perhaps we can do better. |
| *validFlags = 0; |
| return; |
| } |
| |
| GR_DEFINE_EFFECT_TEST(GrBicubicEffect); |
| |
| GrEffectRef* GrBicubicEffect::TestCreate(SkRandom* random, |
| GrContext* context, |
| const GrDrawTargetCaps&, |
| GrTexture* textures[]) { |
| int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx : |
| GrEffectUnitTest::kAlphaTextureIdx; |
| SkScalar coefficients[16]; |
| for (int i = 0; i < 16; i++) { |
| coefficients[i] = random->nextSScalar1(); |
| } |
| return GrBicubicEffect::Create(textures[texIdx], coefficients); |
| } |