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

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

 https://axis-project.github.io/

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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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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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 THE SOFTWARE.
 ****************************************************************************/

#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