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-rw-r--r--src/gpu/effects/GrBicubicEffect.cpp175
1 files changed, 175 insertions, 0 deletions
diff --git a/src/gpu/effects/GrBicubicEffect.cpp b/src/gpu/effects/GrBicubicEffect.cpp
new file mode 100644
index 0000000000..9a38f67860
--- /dev/null
+++ b/src/gpu/effects/GrBicubicEffect.cpp
@@ -0,0 +1,175 @@
+#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 TextureSamplerArray&) SK_OVERRIDE;
+
+ static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&);
+
+ virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE;
+
+private:
+ typedef GrGLUniformManager::UniformHandle UniformHandle;
+
+ UniformHandle fCoefficientsUni;
+ UniformHandle fImageIncrementUni;
+
+ GrGLEffectMatrix fEffectMatrix;
+
+ typedef GrGLEffect INHERITED;
+};
+
+GrGLBicubicEffect::GrGLBicubicEffect(const GrBackendEffectFactory& factory,
+ const GrDrawEffect& drawEffect)
+ : INHERITED(factory)
+ , fEffectMatrix(drawEffect.castEffect<GrBicubicEffect>().coordsType()) {
+}
+
+void GrGLBicubicEffect::emitCode(GrGLShaderBuilder* builder,
+ const GrDrawEffect&,
+ EffectKey key,
+ const char* outputColor,
+ const char* inputColor,
+ const TextureSamplerArray& samplers) {
+ SkString coords;
+ fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, &coords);
+ 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", coords.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);
+}
+
+GrGLEffect::EffectKey GrGLBicubicEffect::GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
+ const GrBicubicEffect& bicubic = drawEffect.castEffect<GrBicubicEffect>();
+ EffectKey matrixKey = GrGLEffectMatrix::GenKey(bicubic.getMatrix(),
+ drawEffect,
+ bicubic.coordsType(),
+ bicubic.texture(0));
+ return matrixKey;
+}
+
+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());
+ fEffectMatrix.setData(uman,
+ effect.getMatrix(),
+ drawEffect,
+ effect.texture(0));
+}
+
+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]);
+ }
+ }
+}
+
+GrBicubicEffect::GrBicubicEffect(GrTexture* texture,
+ const SkScalar coefficients[16],
+ const SkMatrix &matrix,
+ const GrTextureParams &params,
+ CoordsType coordsType)
+ : INHERITED(texture, MakeDivByTextureWHMatrix(texture), params, coordsType) {
+ 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]);
+ }
+ }
+}
+
+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->texture(0) == s.texture(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(SkMWCRandom* 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);
+}