Move GPU gradients into src/effects/gradients.
Review URL: https://codereview.appspot.com/6453055
git-svn-id: http://skia.googlecode.com/svn/trunk@4805 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/gradients/SkTwoPointRadialGradient.cpp b/src/effects/gradients/SkTwoPointRadialGradient.cpp
index 27eb5aa..d2612a4 100644
--- a/src/effects/gradients/SkTwoPointRadialGradient.cpp
+++ b/src/effects/gradients/SkTwoPointRadialGradient.cpp
@@ -362,3 +362,259 @@
fPtsToUnit.postScale(inv, inv);
}
+/////////////////////////////////////////////////////////////////////
+
+// For brevity
+typedef GrGLUniformManager::UniformHandle UniformHandle;
+static const UniformHandle kInvalidUniformHandle = GrGLUniformManager::kInvalidUniformHandle;
+
+class GrGLRadial2Gradient : public GrGLGradientStage {
+
+public:
+
+ GrGLRadial2Gradient(const GrProgramStageFactory& factory,
+ const GrCustomStage&);
+ virtual ~GrGLRadial2Gradient() { }
+
+ virtual void setupVariables(GrGLShaderBuilder* builder) SK_OVERRIDE;
+ virtual void emitVS(GrGLShaderBuilder* builder,
+ const char* vertexCoords) SK_OVERRIDE;
+ virtual void emitFS(GrGLShaderBuilder* builder,
+ const char* outputColor,
+ const char* inputColor,
+ const char* samplerName) SK_OVERRIDE;
+ virtual void setData(const GrGLUniformManager&,
+ const GrCustomStage&,
+ const GrRenderTarget*,
+ int stageNum) SK_OVERRIDE;
+
+ static StageKey GenKey(const GrCustomStage& s) {
+ return (static_cast<const GrRadial2Gradient&>(s).isDegenerate());
+ }
+
+protected:
+
+ UniformHandle fVSParamUni;
+ UniformHandle fFSParamUni;
+
+ const char* fVSVaryingName;
+ const char* fFSVaryingName;
+
+ bool fIsDegenerate;
+
+ // @{
+ /// Values last uploaded as uniforms
+
+ GrScalar fCachedCenter;
+ GrScalar fCachedRadius;
+ bool fCachedPosRoot;
+
+ // @}
+
+private:
+
+ typedef GrGLGradientStage INHERITED;
+
+};
+
+GrGLRadial2Gradient::GrGLRadial2Gradient(
+ const GrProgramStageFactory& factory,
+ const GrCustomStage& baseData)
+ : INHERITED(factory)
+ , fVSParamUni(kInvalidUniformHandle)
+ , fFSParamUni(kInvalidUniformHandle)
+ , fVSVaryingName(NULL)
+ , fFSVaryingName(NULL)
+ , fCachedCenter(GR_ScalarMax)
+ , fCachedRadius(-GR_ScalarMax)
+ , fCachedPosRoot(0) {
+
+ const GrRadial2Gradient& data =
+ static_cast<const GrRadial2Gradient&>(baseData);
+ fIsDegenerate = data.isDegenerate();
+}
+
+void GrGLRadial2Gradient::setupVariables(GrGLShaderBuilder* builder) {
+ // 2 copies of uniform array, 1 for each of vertex & fragment shader,
+ // to work around Xoom bug. Doesn't seem to cause performance decrease
+ // in test apps, but need to keep an eye on it.
+ fVSParamUni = builder->addUniformArray(GrGLShaderBuilder::kVertex_ShaderType,
+ kFloat_GrSLType, "Radial2VSParams", 6);
+ fFSParamUni = builder->addUniformArray(GrGLShaderBuilder::kFragment_ShaderType,
+ kFloat_GrSLType, "Radial2FSParams", 6);
+
+ // For radial gradients without perspective we can pass the linear
+ // part of the quadratic as a varying.
+ if (builder->fVaryingDims == builder->fCoordDims) {
+ builder->addVarying(kFloat_GrSLType, "Radial2BCoeff",
+ &fVSVaryingName, &fFSVaryingName);
+ }
+}
+
+void GrGLRadial2Gradient::emitVS(GrGLShaderBuilder* builder,
+ const char* vertexCoords) {
+ SkString* code = &builder->fVSCode;
+ SkString p2;
+ SkString p3;
+ builder->getUniformVariable(fVSParamUni).appendArrayAccess(2, &p2);
+ builder->getUniformVariable(fVSParamUni).appendArrayAccess(3, &p3);
+
+ // For radial gradients without perspective we can pass the linear
+ // part of the quadratic as a varying.
+ if (builder->fVaryingDims == builder->fCoordDims) {
+ // r2Var = 2 * (r2Parm[2] * varCoord.x - r2Param[3])
+ code->appendf("\t%s = 2.0 *(%s * %s.x - %s);\n",
+ fVSVaryingName, p2.c_str(),
+ vertexCoords, p3.c_str());
+ }
+}
+
+void GrGLRadial2Gradient::emitFS(GrGLShaderBuilder* builder,
+ const char* outputColor,
+ const char* inputColor,
+ const char* samplerName) {
+ SkString* code = &builder->fFSCode;
+ SkString cName("c");
+ SkString ac4Name("ac4");
+ SkString rootName("root");
+ SkString t;
+ SkString p0;
+ SkString p1;
+ SkString p2;
+ SkString p3;
+ SkString p4;
+ SkString p5;
+ builder->getUniformVariable(fFSParamUni).appendArrayAccess(0, &p0);
+ builder->getUniformVariable(fFSParamUni).appendArrayAccess(1, &p1);
+ builder->getUniformVariable(fFSParamUni).appendArrayAccess(2, &p2);
+ builder->getUniformVariable(fFSParamUni).appendArrayAccess(3, &p3);
+ builder->getUniformVariable(fFSParamUni).appendArrayAccess(4, &p4);
+ builder->getUniformVariable(fFSParamUni).appendArrayAccess(5, &p5);
+
+ // If we we're able to interpolate the linear component,
+ // bVar is the varying; otherwise compute it
+ SkString bVar;
+ if (builder->fCoordDims == builder->fVaryingDims) {
+ bVar = fFSVaryingName;
+ GrAssert(2 == builder->fVaryingDims);
+ } else {
+ GrAssert(3 == builder->fVaryingDims);
+ bVar = "b";
+ //bVar.appendS32(stageNum);
+ code->appendf("\tfloat %s = 2.0 * (%s * %s.x - %s);\n",
+ bVar.c_str(), p2.c_str(),
+ builder->fSampleCoords.c_str(), p3.c_str());
+ }
+
+ // c = (x^2)+(y^2) - params[4]
+ code->appendf("\tfloat %s = dot(%s, %s) - %s;\n",
+ cName.c_str(), builder->fSampleCoords.c_str(),
+ builder->fSampleCoords.c_str(),
+ p4.c_str());
+
+ // If we aren't degenerate, emit some extra code, and accept a slightly
+ // more complex coord.
+ if (!fIsDegenerate) {
+
+ // ac4 = 4.0 * params[0] * c
+ code->appendf("\tfloat %s = %s * 4.0 * %s;\n",
+ ac4Name.c_str(), p0.c_str(),
+ cName.c_str());
+
+ // root = sqrt(b^2-4ac)
+ // (abs to avoid exception due to fp precision)
+ code->appendf("\tfloat %s = sqrt(abs(%s*%s - %s));\n",
+ rootName.c_str(), bVar.c_str(), bVar.c_str(),
+ ac4Name.c_str());
+
+ // t is: (-b + params[5] * sqrt(b^2-4ac)) * params[1]
+ t.printf("(-%s + %s * %s) * %s", bVar.c_str(), p5.c_str(),
+ rootName.c_str(), p1.c_str());
+ } else {
+ // t is: -c/b
+ t.printf("-%s / %s", cName.c_str(), bVar.c_str());
+ }
+
+ this->emitColorLookup(builder, t.c_str(), outputColor, samplerName);
+}
+
+void GrGLRadial2Gradient::setData(const GrGLUniformManager& uman,
+ const GrCustomStage& baseData,
+ const GrRenderTarget*,
+ int stageNum) {
+ const GrRadial2Gradient& data =
+ static_cast<const GrRadial2Gradient&>(baseData);
+ GrAssert(data.isDegenerate() == fIsDegenerate);
+ GrScalar centerX1 = data.center();
+ GrScalar radius0 = data.radius();
+ if (fCachedCenter != centerX1 ||
+ fCachedRadius != radius0 ||
+ fCachedPosRoot != data.isPosRoot()) {
+
+ GrScalar a = GrMul(centerX1, centerX1) - GR_Scalar1;
+
+ // When we're in the degenerate (linear) case, the second
+ // value will be INF but the program doesn't read it. (We
+ // use the same 6 uniforms even though we don't need them
+ // all in the linear case just to keep the code complexity
+ // down).
+ float values[6] = {
+ GrScalarToFloat(a),
+ 1 / (2.f * GrScalarToFloat(a)),
+ GrScalarToFloat(centerX1),
+ GrScalarToFloat(radius0),
+ GrScalarToFloat(GrMul(radius0, radius0)),
+ data.isPosRoot() ? 1.f : -1.f
+ };
+
+ uman.set1fv(fVSParamUni, 0, 6, values);
+ uman.set1fv(fFSParamUni, 0, 6, values);
+ fCachedCenter = centerX1;
+ fCachedRadius = radius0;
+ fCachedPosRoot = data.isPosRoot();
+ }
+}
+
+
+/////////////////////////////////////////////////////////////////////
+
+GrRadial2Gradient::GrRadial2Gradient(GrTexture* texture,
+ GrScalar center,
+ GrScalar radius,
+ bool posRoot)
+ : INHERITED(texture)
+ , fCenterX1 (center)
+ , fRadius0 (radius)
+ , fPosRoot (posRoot) {
+
+}
+
+GrRadial2Gradient::GrRadial2Gradient(GrContext* ctx,
+ const SkShader& shader,
+ GrSamplerState* sampler,
+ SkScalar center,
+ SkScalar startRadius,
+ SkScalar diffRadius)
+ : INHERITED(ctx, shader, sampler)
+ , fCenterX1(center)
+ , fRadius0(startRadius)
+ , fPosRoot(diffRadius < 0) {
+}
+
+GrRadial2Gradient::~GrRadial2Gradient() {
+
+}
+
+
+const GrProgramStageFactory& GrRadial2Gradient::getFactory() const {
+ return GrTProgramStageFactory<GrRadial2Gradient>::getInstance();
+}
+
+bool GrRadial2Gradient::isEqual(const GrCustomStage& sBase) const {
+ const GrRadial2Gradient& s = static_cast<const GrRadial2Gradient&>(sBase);
+ return (INHERITED::isEqual(sBase) &&
+ this->fCenterX1 == s.fCenterX1 &&
+ this->fRadius0 == s.fRadius0 &&
+ this->fPosRoot == s.fPosRoot);
+}
+