Method _setAlphaRejectSettings

RenderSystems/Direct3D9/src/OgreD3D9RenderSystem.cpp:2131–2193

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    }
    //---------------------------------------------------------------------
    void D3D9RenderSystem::_setAlphaRejectSettings( CompareFunction func, unsigned char value, bool alphaToCoverage )
    {
        HRESULT hr;
        bool a2c = false;
        static bool lasta2c = false;

        if (func != CMPF_ALWAYS_PASS)
        {
            if( FAILED( hr = __SetRenderState( D3DRS_ALPHATESTENABLE,  TRUE ) ) )
                OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Failed to enable alpha testing",
                "D3D9RenderSystem::_setAlphaRejectSettings" );

            a2c = alphaToCoverage;
        }
        else
        {
            if( FAILED( hr = __SetRenderState( D3DRS_ALPHATESTENABLE,  FALSE ) ) )
                OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Failed to disable alpha testing",
                "D3D9RenderSystem::_setAlphaRejectSettings" );
        }
        // Set always just be sure
        if( FAILED( hr = __SetRenderState( D3DRS_ALPHAFUNC, D3D9Mappings::get(func) ) ) )
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Failed to set alpha reject function", "D3D9RenderSystem::_setAlphaRejectSettings" );
        if( FAILED( hr = __SetRenderState( D3DRS_ALPHAREF, value ) ) )
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Failed to set render state D3DRS_ALPHAREF", "D3D9RenderSystem::_setAlphaRejectSettings" );

        // Alpha to coverage
        if (getCapabilities()->hasCapability(RSC_ALPHA_TO_COVERAGE))
        {
            // Vendor-specific hacks on renderstate, gotta love 'em
            if (getCapabilities()->getVendor() == GPU_NVIDIA)
            {
                if (a2c)
                {
                    if( FAILED( hr = __SetRenderState( D3DRS_ADAPTIVETESS_Y,  (D3DFORMAT)MAKEFOURCC('A', 'T', 'O', 'C') ) ) )
                        OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Failed to set alpha to coverage option", "D3D9RenderSystem::_setAlphaRejectSettings" );
                }
                else
                {
                    if( FAILED( hr = __SetRenderState( D3DRS_ADAPTIVETESS_Y,  D3DFMT_UNKNOWN ) ) )
                        OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Failed to set alpha to coverage option", "D3D9RenderSystem::_setAlphaRejectSettings" );
                }

            }
            else if ((getCapabilities()->getVendor() == GPU_AMD))
            {
                if (a2c)
                {
                    if( FAILED( hr = __SetRenderState( D3DRS_POINTSIZE,  MAKEFOURCC('A','2','M','1') ) ) )
                        OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Failed to set alpha to coverage option", "D3D9RenderSystem::_setAlphaRejectSettings" );
                }
                else
                {
                    // discovered this through trial and error, seems to work
                    if( FAILED( hr = __SetRenderState( D3DRS_POINTSIZE,  MAKEFOURCC('A','2','M','0') ) ) )
                        OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Failed to set alpha to coverage option", "D3D9RenderSystem::_setAlphaRejectSettings" );
                }
            }