Revert of Cleanup of shader building system

src/gpu/gl/builders/GrGLFullProgramBuilder.cpp

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrGLFullProgramBuilder.h"
+#include "../GrGLGeometryProcessor.h"
+#include "../GrGpuGL.h"
+
+GrGLFullProgramBuilder::GrGLFullProgramBuilder(GrGpuGL* gpu, const GrOptDrawState& optState,
+                                               const GrGLProgramDesc& desc)
+    : INHERITED(gpu, optState, desc)
+    , fGLGeometryProcessorEmitter(this)
+    , fGS(this)
+    , fVS(this) {
+}
+
+void
+GrGLFullProgramBuilder::createAndEmitEffects(const GrGeometryStage* geometryProcessor,
+                                             const GrFragmentStage* colorStages[],
+                                             const GrFragmentStage* coverageStages[],
+                                             GrGLSLExpr4* inputColor,
+                                             GrGLSLExpr4* inputCoverage) {
+    fVS.emitCodeBeforeEffects(inputColor, inputCoverage);
+
+    ///////////////////////////////////////////////////////////////////////////
+    // emit the per-effect code for both color and coverage effects
+
+    EffectKeyProvider colorKeyProvider(&this->desc(), EffectKeyProvider::kColor_EffectType);
+    fColorEffects.reset(this->onCreateAndEmitEffects(colorStages,
+                                                     this->desc().numColorEffects(),
+                                                     colorKeyProvider,
+                                                     inputColor));
+
+    if (geometryProcessor) {
+        const GrGeometryProcessor& gp = *geometryProcessor->getGeometryProcessor();
+        fGLGeometryProcessorEmitter.set(&gp);
+        fEffectEmitter = &fGLGeometryProcessorEmitter;
+        fVS.emitAttributes(gp);
+        GrGLSLExpr4 gpInputCoverage = *inputCoverage;
+        GrGLSLExpr4 gpOutputCoverage;
+        EffectKeyProvider gpKeyProvider(&this->desc(),
+                EffectKeyProvider::kGeometryProcessor_EffectType);
+        bool useLocalCoords = this->getVertexShaderBuilder()->hasExplicitLocalCoords();
+        fProgramEffects.reset(SkNEW_ARGS(GrGLVertexProgramEffects, (1, useLocalCoords)));
+        this->INHERITED::emitEffect(*geometryProcessor, 0, gpKeyProvider, &gpInputCoverage,
+                                    &gpOutputCoverage);
+        fGeometryProcessor.reset(fProgramEffects.detach());
+        *inputCoverage = gpOutputCoverage;
+    }
+
+    EffectKeyProvider coverageKeyProvider(&this->desc(), EffectKeyProvider::kCoverage_EffectType);
+    fCoverageEffects.reset(this->onCreateAndEmitEffects(coverageStages,
+                                                        this->desc().numCoverageEffects(),
+                                                        coverageKeyProvider,
+                                                        inputCoverage));
+
+     fVS.emitCodeAfterEffects();
+}
+
+void GrGLFullProgramBuilder::addVarying(GrSLType type,
+                                        const char* name,
+                                        const char** vsOutName,
+                                        const char** fsInName,
+                                        GrGLShaderVar::Precision fsPrecision) {
+    fVS.addVarying(type, name, vsOutName);
+
+    SkString* fsInputName = fVS.fOutputs.back().accessName();
+
+#if GR_GL_EXPERIMENTAL_GS
+    if (desc().getHeader().fExperimentalGS) {
+       // TODO let the caller use these names
+       fGS.addVarying(type, fsInputName->c_str(), NULL);
+       fsInputName = fGS.fOutputs.back().accessName();
+    }
+#endif
+    fFS.addVarying(type, fsInputName->c_str(), fsInName, fsPrecision);
+}
+
+GrGLFullProgramBuilder::VaryingHandle
+GrGLFullProgramBuilder::addSeparableVarying(GrSLType type,
+                                            const char* name,
+                                            const char** vsOutName,
+                                            const char** fsInName) {
+    addVarying(type, name, vsOutName, fsInName);
+    SeparableVaryingInfo& varying = fSeparableVaryingInfos.push_back();
+    varying.fVariable = fFS.fInputs.back();
+    return VaryingHandle::CreateFromSeparableVaryingIndex(fSeparableVaryingInfos.count() - 1);
+}
+
+GrGLProgramEffects* GrGLFullProgramBuilder::onCreateAndEmitEffects(
+        const GrFragmentStage* effectStages[],
+        int effectCnt,
+        const GrGLProgramDesc::EffectKeyProvider& keyProvider,
+        GrGLSLExpr4* inOutFSColor) {
+    fProgramEffects.reset(SkNEW_ARGS(GrGLVertexProgramEffects,
+                                 (effectCnt,
+                                  this->getVertexShaderBuilder()->hasExplicitLocalCoords())));
+    this->INHERITED::createAndEmitEffects(effectStages,
+                                          effectCnt,
+                                          keyProvider,
+                                          inOutFSColor);
+    return fProgramEffects.detach();
+}
+
+void GrGLFullProgramBuilder::emitEffect(const GrProcessorStage& stage,
+                                        const GrProcessorKey& key,
+                                        const char* outColor,
+                                        const char* inColor,
+                                        int stageIndex) {
+    SkASSERT(fProgramEffects.get());
+    const GrProcessor& effect = *stage.getProcessor();
+    SkSTArray<2, GrGLProcessor::TransformedCoords> coords(effect.numTransforms());
+    SkSTArray<4, GrGLProcessor::TextureSampler> samplers(effect.numTextures());
+
+    this->emitTransforms(stage, &coords);
+    this->emitSamplers(effect, &samplers);
+
+    SkASSERT(fEffectEmitter);
+    GrGLProcessor* glEffect = fEffectEmitter->createGLInstance();
+    fProgramEffects->addEffect(glEffect);
+
+    // Enclose custom code in a block to avoid namespace conflicts
+    SkString openBrace;
+    openBrace.printf("{ // Stage %d: %s\n", stageIndex, glEffect->name());
+    fFS.codeAppend(openBrace.c_str());
+    fVS.codeAppend(openBrace.c_str());
+
+    fEffectEmitter->emit(key, outColor, inColor, coords, samplers);
+
+    fVS.codeAppend("\t}\n");
+    fFS.codeAppend("\t}\n");
+}
+
+void GrGLFullProgramBuilder::emitTransforms(const GrProcessorStage& effectStage,
+                                            GrGLProcessor::TransformedCoordsArray* outCoords) {
+    SkTArray<GrGLVertexProgramEffects::Transform, true>& transforms =
+            fProgramEffects->addTransforms();
+    const GrProcessor* effect = effectStage.getProcessor();
+    int numTransforms = effect->numTransforms();
+    transforms.push_back_n(numTransforms);
+
+    SkTArray<GrGLVertexProgramEffects::PathTransform, true>* pathTransforms = NULL;
+    const GrGLCaps* glCaps = this->ctxInfo().caps();
+    if (glCaps->pathRenderingSupport() &&
+        this->gpu()->glPathRendering()->texturingMode() ==
+           GrGLPathRendering::SeparableShaders_TexturingMode) {
+        pathTransforms = &fProgramEffects->addPathTransforms();
+        pathTransforms->push_back_n(numTransforms);
+    }
+
+    for (int t = 0; t < numTransforms; t++) {
+        const char* uniName = "StageMatrix";
+        GrSLType varyingType =
+                effectStage.isPerspectiveCoordTransform(t, fVS.hasExplicitLocalCoords()) ?
+                        kVec3f_GrSLType :
+                        kVec2f_GrSLType;
+
+        SkString suffixedUniName;
+        if (0 != t) {
+            suffixedUniName.append(uniName);
+            suffixedUniName.appendf("_%i", t);
+            uniName = suffixedUniName.c_str();
+        }
+        transforms[t].fHandle = this->addUniform(GrGLProgramBuilder::kVertex_Visibility,
+                                                 kMat33f_GrSLType,
+                                                 uniName,
+                                                 &uniName);
+
+        const char* varyingName = "MatrixCoord";
+        SkString suffixedVaryingName;
+        if (0 != t) {
+            suffixedVaryingName.append(varyingName);
+            suffixedVaryingName.appendf("_%i", t);
+            varyingName = suffixedVaryingName.c_str();
+        }
+        const char* vsVaryingName;
+        const char* fsVaryingName;
+        if (pathTransforms) {
+            (*pathTransforms)[t].fHandle =
+                this->addSeparableVarying(varyingType, varyingName, &vsVaryingName, &fsVaryingName);
+            (*pathTransforms)[t].fType = varyingType;
+        } else {
+            this->addVarying(varyingType, varyingName, &vsVaryingName, &fsVaryingName);
+        }
+
+        const GrGLShaderVar& coords =
+                kPosition_GrCoordSet == effect->coordTransform(t).sourceCoords() ?
+                                          fVS.positionAttribute() :
+                                          fVS.localCoordsAttribute();
+        // varying = matrix * coords (logically)
+        SkASSERT(kVec2f_GrSLType == varyingType || kVec3f_GrSLType == varyingType);
+        if (kVec2f_GrSLType == varyingType) {
+            fVS.codeAppendf("%s = (%s * vec3(%s, 1)).xy;",
+                            vsVaryingName, uniName, coords.c_str());
+        } else {
+            fVS.codeAppendf("%s = %s * vec3(%s, 1);",
+                            vsVaryingName, uniName, coords.c_str());
+        }
+        SkNEW_APPEND_TO_TARRAY(outCoords, GrGLProcessor::TransformedCoords,
+                               (SkString(fsVaryingName), varyingType));
+    }
+}
+
+bool GrGLFullProgramBuilder::compileAndAttachShaders(GrGLuint programId,
+                                                     SkTDArray<GrGLuint>* shaderIds) const {
+    return INHERITED::compileAndAttachShaders(programId, shaderIds)
+         && fVS.compileAndAttachShaders(programId, shaderIds)
+#if GR_GL_EXPERIMENTAL_GS
+         && (!desc().getHeader().fExperimentalGS
+                 || fGS.compileAndAttachShaders(programId, shaderIds))
+#endif
+         ;
+}
+
+void GrGLFullProgramBuilder::bindProgramLocations(GrGLuint programId) {
+    fVS.bindProgramLocations(programId);
+    INHERITED::bindProgramLocations(programId);
+}