Added GrGLFragmentProcessor::EmitArgs struct for use with emitCode()

src/effects/SkPerlinNoiseShader.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDither.h"
 #include "SkPerlinNoiseShader.h"
 #include "SkColorFilter.h"
@@ skipping 469 matching lines @@
 
 /////////////////////////////////////////////////////////////////////
 
 #if SK_SUPPORT_GPU
 
 class GrGLPerlinNoise : public GrGLFragmentProcessor {
 public:
     GrGLPerlinNoise(const GrProcessor&);
     virtual ~GrGLPerlinNoise() {}
 
-    virtual void emitCode(GrGLFPBuilder*,
-                          const GrFragmentProcessor&,
-                          const char* outputColor,
-                          const char* inputColor,
-                          const TransformedCoordsArray&,
-                          const TextureSamplerArray&) override;
+    virtual void emitCode(EmitArgs&) override;
 
     void setData(const GrGLProgramDataManager&, const GrProcessor&) override;
 
     static inline void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder* b);
 
 private:
 
     GrGLProgramDataManager::UniformHandle fStitchDataUni;
     SkPerlinNoiseShader::Type             fType;
     bool                                  fStitchTiles;
@@ skipping 126 matching lines @@
 
     return effect;
 }
 
 GrGLPerlinNoise::GrGLPerlinNoise(const GrProcessor& processor)
   : fType(processor.cast<GrPerlinNoiseEffect>().type())
   , fStitchTiles(processor.cast<GrPerlinNoiseEffect>().stitchTiles())
   , fNumOctaves(processor.cast<GrPerlinNoiseEffect>().numOctaves()) {
 }
 
-void GrGLPerlinNoise::emitCode(GrGLFPBuilder* builder,
-                               const GrFragmentProcessor&,
-                               const char* outputColor,
-                               const char* inputColor,
-                               const TransformedCoordsArray& coords,
-                               const TextureSamplerArray& samplers) {
-    sk_ignore_unused_variable(inputColor);
+void GrGLPerlinNoise::emitCode(EmitArgs& args) {
+    GrGLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBuilder();
+    SkString vCoords = fsBuilder->ensureFSCoords2D(args.fCoords, 0);
 
-    GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
-    SkString vCoords = fsBuilder->ensureFSCoords2D(coords, 0);
-
-    fBaseFrequencyUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
+    fBaseFrequencyUni = args.fBuilder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                             kVec2f_GrSLType, kDefault_GrSLPrecision,
                                             "baseFrequency");
-    const char* baseFrequencyUni = builder->getUniformCStr(fBaseFrequencyUni);
-    fAlphaUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
+    const char* baseFrequencyUni = args.fBuilder->getUniformCStr(fBaseFrequencyUni);
+    fAlphaUni = args.fBuilder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                     kFloat_GrSLType, kDefault_GrSLPrecision,
                                     "alpha");
-    const char* alphaUni = builder->getUniformCStr(fAlphaUni);
+    const char* alphaUni = args.fBuilder->getUniformCStr(fAlphaUni);
 
     const char* stitchDataUni = NULL;
     if (fStitchTiles) {
-        fStitchDataUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
+        fStitchDataUni = args.fBuilder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                              kVec2f_GrSLType, kDefault_GrSLPrecision,
                                              "stitchData");
-        stitchDataUni = builder->getUniformCStr(fStitchDataUni);
+        stitchDataUni = args.fBuilder->getUniformCStr(fStitchDataUni);
     }
 
     // There are 4 lines, so the center of each line is 1/8, 3/8, 5/8 and 7/8
     const char* chanCoordR  = "0.125";
     const char* chanCoordG  = "0.375";
     const char* chanCoordB  = "0.625";
     const char* chanCoordA  = "0.875";
     const char* chanCoord   = "chanCoord";
     const char* stitchData  = "stitchData";
     const char* ratio       = "ratio";
@@ skipping 49 matching lines @@
     // Get texture coordinates and normalize
     noiseCode.appendf("\n\t%s = fract(floor(mod(%s, 256.0)) / vec4(256.0));\n",
         floorVal, floorVal);
 
     // Get permutation for x
     {
         SkString xCoords("");
         xCoords.appendf("vec2(%s.x, 0.5)", floorVal);
 
         noiseCode.appendf("\n\tvec2 %s;\n\t%s.x = ", latticeIdx, latticeIdx);
-        fsBuilder->appendTextureLookup(&noiseCode, samplers[0], xCoords.c_str(), kVec2f_GrSLType);
+        fsBuilder->appendTextureLookup(&noiseCode, args.fSamplers[0], xCoords.c_str(),
+                                       kVec2f_GrSLType);
         noiseCode.append(".r;");
     }
 
     // Get permutation for x + 1
     {
         SkString xCoords("");
         xCoords.appendf("vec2(%s.z, 0.5)", floorVal);
 
         noiseCode.appendf("\n\t%s.y = ", latticeIdx);
-        fsBuilder->appendTextureLookup(&noiseCode, samplers[0], xCoords.c_str(), kVec2f_GrSLType);
+        fsBuilder->appendTextureLookup(&noiseCode, args.fSamplers[0], xCoords.c_str(),
+                                       kVec2f_GrSLType);
         noiseCode.append(".r;");
     }
 
 #if defined(SK_BUILD_FOR_ANDROID)
     // Android rounding for Tegra devices, like, for example: Xoom (Tegra 2), Nexus 7 (Tegra 3).
     // The issue is that colors aren't accurate enough on Tegra devices. For example, if an 8 bit
     // value of 124 (or 0.486275 here) is entered, we can get a texture value of 123.513725
     // (or 0.484368 here). The following rounding operation prevents these precision issues from
     // affecting the result of the noise by making sure that we only have multiples of 1/255.
     // (Note that 1/255 is about 0.003921569, which is the value used here).
     noiseCode.appendf("\n\t%s = floor(%s * vec2(255.0) + vec2(0.5)) * vec2(0.003921569);",
                       latticeIdx, latticeIdx);
 #endif
 
     // Get (x,y) coordinates with the permutated x
     noiseCode.appendf("\n\tvec4 %s = fract(%s.xyxy + %s.yyww);", bcoords, latticeIdx, floorVal);
 
     noiseCode.appendf("\n\n\tvec2 %s;", uv);
     // Compute u, at offset (0,0)
     {
         SkString latticeCoords("");
         latticeCoords.appendf("vec2(%s.x, %s)", bcoords, chanCoord);
         noiseCode.appendf("\n\tvec4 %s = ", lattice);
-        fsBuilder->appendTextureLookup(&noiseCode, samplers[1], latticeCoords.c_str(),
+        fsBuilder->appendTextureLookup(&noiseCode, args.fSamplers[1], latticeCoords.c_str(),
             kVec2f_GrSLType);
         noiseCode.appendf(".bgra;\n\t%s.x = ", uv);
         noiseCode.appendf(dotLattice, lattice, lattice, inc8bit, fractVal);
     }
 
     noiseCode.appendf("\n\t%s.x -= 1.0;", fractVal);
     // Compute v, at offset (-1,0)
     {
         SkString latticeCoords("");
         latticeCoords.appendf("vec2(%s.y, %s)", bcoords, chanCoord);
         noiseCode.append("\n\tlattice = ");
-        fsBuilder->appendTextureLookup(&noiseCode, samplers[1], latticeCoords.c_str(),
+        fsBuilder->appendTextureLookup(&noiseCode, args.fSamplers[1], latticeCoords.c_str(),
             kVec2f_GrSLType);
         noiseCode.appendf(".bgra;\n\t%s.y = ", uv);
         noiseCode.appendf(dotLattice, lattice, lattice, inc8bit, fractVal);
     }
 
     // Compute 'a' as a linear interpolation of 'u' and 'v'
     noiseCode.appendf("\n\tvec2 %s;", ab);
     noiseCode.appendf("\n\t%s.x = mix(%s.x, %s.y, %s.x);", ab, uv, uv, noiseSmooth);
 
     noiseCode.appendf("\n\t%s.y -= 1.0;", fractVal);
     // Compute v, at offset (-1,-1)
     {
         SkString latticeCoords("");
         latticeCoords.appendf("vec2(%s.w, %s)", bcoords, chanCoord);
         noiseCode.append("\n\tlattice = ");
-        fsBuilder->appendTextureLookup(&noiseCode, samplers[1], latticeCoords.c_str(),
+        fsBuilder->appendTextureLookup(&noiseCode, args.fSamplers[1], latticeCoords.c_str(),
             kVec2f_GrSLType);
         noiseCode.appendf(".bgra;\n\t%s.y = ", uv);
         noiseCode.appendf(dotLattice, lattice, lattice, inc8bit, fractVal);
     }
 
     noiseCode.appendf("\n\t%s.x += 1.0;", fractVal);
     // Compute u, at offset (0,-1)
     {
         SkString latticeCoords("");
         latticeCoords.appendf("vec2(%s.z, %s)", bcoords, chanCoord);
         noiseCode.append("\n\tlattice = ");
-        fsBuilder->appendTextureLookup(&noiseCode, samplers[1], latticeCoords.c_str(),
+        fsBuilder->appendTextureLookup(&noiseCode, args.fSamplers[1], latticeCoords.c_str(),
             kVec2f_GrSLType);
         noiseCode.appendf(".bgra;\n\t%s.x = ", uv);
         noiseCode.appendf(dotLattice, lattice, lattice, inc8bit, fractVal);
     }
 
     // Compute 'b' as a linear interpolation of 'u' and 'v'
     noiseCode.appendf("\n\t%s.y = mix(%s.x, %s.y, %s.x);", ab, uv, uv, noiseSmooth);
     // Compute the noise as a linear interpolation of 'a' and 'b'
     noiseCode.appendf("\n\treturn mix(%s.x, %s.y, %s.y);\n", ab, ab, noiseSmooth);
 
     SkString noiseFuncName;
     if (fStitchTiles) {
         fsBuilder->emitFunction(kFloat_GrSLType,
                                 "perlinnoise", SK_ARRAY_COUNT(gPerlinNoiseStitchArgs),
                                 gPerlinNoiseStitchArgs, noiseCode.c_str(), &noiseFuncName);
     } else {
         fsBuilder->emitFunction(kFloat_GrSLType,
                                 "perlinnoise", SK_ARRAY_COUNT(gPerlinNoiseArgs),
                                 gPerlinNoiseArgs, noiseCode.c_str(), &noiseFuncName);
     }
 
     // There are rounding errors if the floor operation is not performed here
     fsBuilder->codeAppendf("\n\t\tvec2 %s = floor(%s.xy) * %s;",
                            noiseVec, vCoords.c_str(), baseFrequencyUni);
 
     // Clear the color accumulator
-    fsBuilder->codeAppendf("\n\t\t%s = vec4(0.0);", outputColor);
+    fsBuilder->codeAppendf("\n\t\t%s = vec4(0.0);", args.fOutputColor);
 
     if (fStitchTiles) {
         // Set up TurbulenceInitial stitch values.
         fsBuilder->codeAppendf("\n\t\tvec2 %s = %s;", stitchData, stitchDataUni);
     }
 
     fsBuilder->codeAppendf("\n\t\tfloat %s = 1.0;", ratio);
 
     // Loop over all octaves
     fsBuilder->codeAppendf("\n\t\tfor (int octave = 0; octave < %d; ++octave) {", fNumOctaves);
 
-    fsBuilder->codeAppendf("\n\t\t\t%s += ", outputColor);
+    fsBuilder->codeAppendf("\n\t\t\t%s += ", args.fOutputColor);
     if (fType != SkPerlinNoiseShader::kFractalNoise_Type) {
         fsBuilder->codeAppend("abs(");
     }
     if (fStitchTiles) {
         fsBuilder->codeAppendf(
             "vec4(\n\t\t\t\t%s(%s, %s, %s),\n\t\t\t\t%s(%s, %s, %s),"
                  "\n\t\t\t\t%s(%s, %s, %s),\n\t\t\t\t%s(%s, %s, %s))",
             noiseFuncName.c_str(), chanCoordR, noiseVec, stitchData,
             noiseFuncName.c_str(), chanCoordG, noiseVec, stitchData,
             noiseFuncName.c_str(), chanCoordB, noiseVec, stitchData,
@@ skipping 16 matching lines @@
     fsBuilder->codeAppendf("\n\t\t\t%s *= 0.5;", ratio);
 
     if (fStitchTiles) {
         fsBuilder->codeAppendf("\n\t\t\t%s *= vec2(2.0);", stitchData);
     }
     fsBuilder->codeAppend("\n\t\t}"); // end of the for loop on octaves
 
     if (fType == SkPerlinNoiseShader::kFractalNoise_Type) {
         // The value of turbulenceFunctionResult comes from ((turbulenceFunctionResult) + 1) / 2
         // by fractalNoise and (turbulenceFunctionResult) by turbulence.
-        fsBuilder->codeAppendf("\n\t\t%s = %s * vec4(0.5) + vec4(0.5);", outputColor, outputColor);
+        fsBuilder->codeAppendf("\n\t\t%s = %s * vec4(0.5) + vec4(0.5);",
+                               args.fOutputColor,args.fOutputColor);
     }
 
-    fsBuilder->codeAppendf("\n\t\t%s.a *= %s;", outputColor, alphaUni);
+    fsBuilder->codeAppendf("\n\t\t%s.a *= %s;", args.fOutputColor, alphaUni);
 
     // Clamp values
-    fsBuilder->codeAppendf("\n\t\t%s = clamp(%s, 0.0, 1.0);", outputColor, outputColor);
+    fsBuilder->codeAppendf("\n\t\t%s = clamp(%s, 0.0, 1.0);", args.fOutputColor, args.fOutputColor);
 
     // Pre-multiply the result
     fsBuilder->codeAppendf("\n\t\t%s = vec4(%s.rgb * %s.aaa, %s.a);\n",
-                  outputColor, outputColor, outputColor, outputColor);
+                           args.fOutputColor, args.fOutputColor,
+                           args.fOutputColor, args.fOutputColor);
 }
 
 void GrGLPerlinNoise::GenKey(const GrProcessor& processor, const GrGLSLCaps&,
                              GrProcessorKeyBuilder* b) {
     const GrPerlinNoiseEffect& turbulence = processor.cast<GrPerlinNoiseEffect>();
 
     uint32_t key = turbulence.numOctaves();
 
     key = key << 3; // Make room for next 3 bits
 
@@ skipping 127 matching lines @@
     str->append(" seed: ");
     str->appendScalar(fSeed);
     str->append(" stitch tiles: ");
     str->append(fStitchTiles ? "true " : "false ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif