axmol/cocos/renderer/backend/opengl/RenderPipelineGL.cpp

/****************************************************************************
Copyright (c) 2018-2019 Xiamen Yaji Software Co., Ltd.
Copyright (c) 2020 c4games.com.

 http://www.cocos2d-x.org

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include "RenderPipelineGL.h"
#include "ShaderModuleGL.h"
#include "DepthStencilStateGL.h"
#include "ProgramGL.h"
#include "UtilsGL.h"

#include <assert.h>

CC_BACKEND_BEGIN

void RenderPipelineGL::update(const PipelineDescriptor& pipelineDescirptor, const RenderPassDescriptor& renderpassDescriptor)
{
    if(_programGL != pipelineDescirptor.programState->getProgram())
    {
        CC_SAFE_RELEASE(_programGL);
        _programGL = static_cast<ProgramGL*>(pipelineDescirptor.programState->getProgram());
        CC_SAFE_RETAIN(_programGL);
    }
    
    updateBlendState(pipelineDescirptor.blendDescriptor);
}

void RenderPipelineGL::updateBlendState(const BlendDescriptor& descriptor)
{
    auto blendEnabled = descriptor.blendEnabled;
    auto rgbBlendOperation = UtilsGL::toGLBlendOperation(descriptor.rgbBlendOperation);
    auto alphaBlendOperation = UtilsGL::toGLBlendOperation(descriptor.alphaBlendOperation);
    auto sourceRGBBlendFactor = UtilsGL::toGLBlendFactor(descriptor.sourceRGBBlendFactor);
    auto destinationRGBBlendFactor = UtilsGL::toGLBlendFactor(descriptor.destinationRGBBlendFactor);
    auto sourceAlphaBlendFactor = UtilsGL::toGLBlendFactor(descriptor.sourceAlphaBlendFactor);
    auto destinationAlphaBlendFactor = UtilsGL::toGLBlendFactor(descriptor.destinationAlphaBlendFactor);
    GLboolean writeMaskRed = (GLboolean)((descriptor.writeMask & ColorWriteMask::RED) >> ColorWriteMask::RED_BIT);
    GLboolean writeMaskGreen = (GLboolean)((descriptor.writeMask & ColorWriteMask::GREEN) >> ColorWriteMask::GREEN_BIT);
    GLboolean writeMaskBlue = (GLboolean)((descriptor.writeMask & ColorWriteMask::BLUE) >> ColorWriteMask::BLUE_BIT);
    GLboolean writeMaskAlpha = (GLboolean)((descriptor.writeMask & ColorWriteMask::ALPHA) >> ColorWriteMask::ALPHA_BIT);

    if (blendEnabled)
    {
        glEnable(GL_BLEND);
        glBlendEquationSeparate(rgbBlendOperation, alphaBlendOperation);
        glBlendFuncSeparate(sourceRGBBlendFactor,
                            destinationRGBBlendFactor,
                            sourceAlphaBlendFactor,
                            destinationAlphaBlendFactor);
    }
    else
        glDisable(GL_BLEND);
    
    glColorMask(writeMaskRed, writeMaskGreen, writeMaskBlue, writeMaskAlpha);
}

RenderPipelineGL::~RenderPipelineGL()
{
    CC_SAFE_RELEASE(_programGL);
}

CC_BACKEND_END