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

/****************************************************************************
Copyright (c) 2018-2019 Xiamen Yaji Software Co., Ltd.
Copyright (c) 2020 C4games Ltd.

 https://axmolengine.github.io/

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 of this software and associated documentation files (the "Software"), to deal
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

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

#include <assert.h>

NS_AX_BACKEND_BEGIN

void RenderPipelineGL::update(const RenderTarget*, const PipelineDescriptor& pipelineDescirptor)
{
    if (_programGL != pipelineDescirptor.programState->getProgram())
    {
        AX_SAFE_RELEASE(_programGL);
        _programGL = static_cast<ProgramGL*>(pipelineDescirptor.programState->getProgram());
        AX_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           = bitmask::any(descriptor.writeMask, ColorWriteMask::RED);
    GLboolean writeMaskGreen         = bitmask::any(descriptor.writeMask, ColorWriteMask::GREEN);
    GLboolean writeMaskBlue          = bitmask::any(descriptor.writeMask, ColorWriteMask::BLUE);
    GLboolean writeMaskAlpha         = bitmask::any(descriptor.writeMask, ColorWriteMask::ALPHA);

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

    glColorMask(writeMaskRed, writeMaskGreen, writeMaskBlue, writeMaskAlpha);
}

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

NS_AX_BACKEND_END