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

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

 https://axmolengine.github.io/

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 of this software and associated documentation files (the "Software"), to deal
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#include "DepthStencilStateGL.h"
#include "platform/GL.h"

#include "renderer/backend/opengl/MacrosGL.h"
#include "renderer/backend/opengl/UtilsGL.h"
#include "OpenGLState.h"

NS_AX_BACKEND_BEGIN

void DepthStencilStateGL::reset()
{
    __gl->disableDepthTest();
    __gl->disableStencilTest();
}

void DepthStencilStateGL::apply(unsigned int stencilReferenceValueFront, unsigned int stencilReferenceValueBack) const
{
    const auto dsFlags = _depthStencilInfo.flags;
    // depth test
    if (bitmask::any(dsFlags, DepthStencilFlags::DEPTH_TEST))
        __gl->enableDepthTest();
    else
        __gl->disableDepthTest();

    __gl->depthMask(bitmask::any(dsFlags, DepthStencilFlags::DEPTH_WRITE));
    __gl->depthFunc(UtilsGL::toGLComareFunction(_depthStencilInfo.depthCompareFunction));

    // stencil test
    if (bitmask::any(dsFlags, DepthStencilFlags::STENCIL_TEST))
    {
        __gl->enableStencilTest();

        if (_isBackFrontStencilEqual)
        {
            __gl->stencilFunc(UtilsGL::toGLComareFunction(_depthStencilInfo.frontFaceStencil.stencilCompareFunction),
                             (GLint)stencilReferenceValueFront, _depthStencilInfo.frontFaceStencil.readMask);

            __gl->stencilOp(UtilsGL::toGLStencilOperation(_depthStencilInfo.frontFaceStencil.stencilFailureOperation),
                           UtilsGL::toGLStencilOperation(_depthStencilInfo.frontFaceStencil.depthFailureOperation),
                           UtilsGL::toGLStencilOperation(_depthStencilInfo.frontFaceStencil.depthStencilPassOperation));

            __gl->stencilMask(_depthStencilInfo.frontFaceStencil.writeMask);
        }
        else
        {
            __gl->stencilFuncFront(UtilsGL::toGLComareFunction(_depthStencilInfo.backFaceStencil.stencilCompareFunction),
                                  (GLint)stencilReferenceValueBack, _depthStencilInfo.backFaceStencil.readMask);
            __gl->stencilFuncBack(UtilsGL::toGLComareFunction(_depthStencilInfo.frontFaceStencil.stencilCompareFunction),
                                 (GLint)stencilReferenceValueFront, _depthStencilInfo.frontFaceStencil.readMask);

            __gl->stencilOpFront(
                UtilsGL::toGLStencilOperation(_depthStencilInfo.backFaceStencil.stencilFailureOperation),
                UtilsGL::toGLStencilOperation(_depthStencilInfo.backFaceStencil.depthFailureOperation),
                UtilsGL::toGLStencilOperation(_depthStencilInfo.backFaceStencil.depthStencilPassOperation));
            __gl->stencilOpBack(
                UtilsGL::toGLStencilOperation(_depthStencilInfo.frontFaceStencil.stencilFailureOperation),
                UtilsGL::toGLStencilOperation(_depthStencilInfo.frontFaceStencil.depthFailureOperation),
                UtilsGL::toGLStencilOperation(_depthStencilInfo.frontFaceStencil.depthStencilPassOperation));

            __gl->stencilMaskBack(_depthStencilInfo.backFaceStencil.writeMask);
            __gl->stencilMaskFront(_depthStencilInfo.frontFaceStencil.writeMask);
        }
    }
    else
        __gl->disableStencilTest();

    CHECK_GL_ERROR_DEBUG();
}

NS_AX_BACKEND_END