GrGLSLBlend.h

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/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef GrGLBlend_DEFINED
#define GrGLBlend_DEFINED
 
#include "src/gpu/ganesh/glsl/GrGLSLProgramDataManager.h"
 
#include <string>
 
class GrGLSLUniformHandler;
class GrProcessor;
enum class SkBlendMode;
 
namespace GrGLSLBlend {
 
/**
 * Returns an SkSL expression that blends the passed-in srcColor and dstColor values.
 * Matching calls to SetBlendModeUniformData and BlendKey must be made from your GrProcessor.
 */
std::string BlendExpression(const GrProcessor* processor,
                            GrGLSLUniformHandler* uniformHandler,
                            GrGLSLProgramDataManager::UniformHandle* uniform,
                            const char* srcColor,
                            const char* dstColor,
                            SkBlendMode mode);
 
/**
 * Returns a key, for use in onAddToKey from any GrProcessor. You must pass the same blend mode that
 * was passed to BlendExpression
 */
int BlendKey(SkBlendMode mode);
 
/**
 * Sets up uniforms, for use in onSetData from any GrProcessor. You must pass the same uniform and
 * blend mode that were passed to BlendExpression.
 */
void SetBlendModeUniformData(const GrGLSLProgramDataManager& pdman,
                             GrGLSLProgramDataManager::UniformHandle uniform,
                             SkBlendMode mode);
 
}  // namespace GrGLSLBlend
 
#endif