blob: 14464f78e32daad16230894ef472d802fded3e25 [file] [log] [blame]
* 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 "effects/GrDisableColorXP.h"
#include "GrPipeline.h"
#include "GrProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLProgramDataManager.h"
#include "glsl/GrGLSLXferProcessor.h"
* This xfer processor disables color writing. Thus color and coverage and ignored and no blending
* occurs. This XP is usful for things like stenciling.
class DisableColorXP : public GrXferProcessor {
DisableColorXP() { this->initClassID<DisableColorXP>(); }
const char* name() const override { return "Disable Color"; }
GrGLSLXferProcessor* createGLSLInstance() const override;
void onGetGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override;
void onGetBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const override;
bool onIsEqual(const GrXferProcessor& xpBase) const override {
return true;
typedef GrXferProcessor INHERITED;
class GLDisableColorXP : public GrGLSLXferProcessor {
GLDisableColorXP(const GrProcessor&) {}
~GLDisableColorXP() override {}
static void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder*) {}
void emitOutputsForBlendState(const EmitArgs& args) override {
// This emit code should be empty. However, on the nexus 6 there is a driver bug where if
// you do not give gl_FragColor a value, the gl context is lost and we end up drawing
// nothing. So this fix just sets the gl_FragColor arbitrarily to 0.
GrGLSLXPFragmentBuilder* fragBuilder = args.fXPFragBuilder;
fragBuilder->codeAppendf("%s = vec4(0);", args.fOutputPrimary);
void onSetData(const GrGLSLProgramDataManager&, const GrXferProcessor&) override {}
typedef GrGLSLXferProcessor INHERITED;
void DisableColorXP::onGetGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const {
GLDisableColorXP::GenKey(*this, caps, b);
GrGLSLXferProcessor* DisableColorXP::createGLSLInstance() const { return new GLDisableColorXP(*this); }
void DisableColorXP::onGetBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const {
blendInfo->fWriteColor = false;
sk_sp<const GrXferProcessor> GrDisableColorXPFactory::makeXferProcessor(
const GrProcessorAnalysisColor&,
bool hasMixedSamples,
const GrCaps& caps) const {
return sk_sp<const GrXferProcessor>(new DisableColorXP);
const GrXPFactory* GrDisableColorXPFactory::TestGet(GrProcessorTestData*) {
return GrDisableColorXPFactory::Get();