blend_jit.h

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 * Copyright (C) 2014-2015 Intel Corporation.   All Rights Reserved.
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 *
 * @file blend_jit.h
 *
 * @brief Definition of the blend jitter
 *
 * Notes:
 *
 ******************************************************************************/
#pragma once

#include "common/formats.h"
#include "core/state.h"

struct RENDER_TARGET_BLEND_COMPILE_STATE
{
    bool             blendEnable;
    bool             logicOpEnable;
    SWR_BLEND_FACTOR sourceAlphaBlendFactor;
    SWR_BLEND_FACTOR destAlphaBlendFactor;
    SWR_BLEND_FACTOR sourceBlendFactor;
    SWR_BLEND_FACTOR destBlendFactor;
    SWR_BLEND_OP     colorBlendFunc;
    SWR_BLEND_OP     alphaBlendFunc;
    SWR_LOGIC_OP     logicOpFunc;
};

enum ALPHA_TEST_FORMAT
{
    ALPHA_TEST_UNORM8,
    ALPHA_TEST_FLOAT32
};

//////////////////////////////////////////////////////////////////////////
/// BLEND_DESC
//////////////////////////////////////////////////////////////////////////
struct BLEND_DESC
{
    union
    {
        struct
        {
            uint32_t alphaTestEnable : 1;
            uint32_t independentAlphaBlendEnable : 1;
            uint32_t alphaToCoverageEnable : 1;
            uint32_t oMaskEnable : 1;
            uint32_t inputCoverageEnable : 1;
            uint32_t sampleMaskEnable : 1;
            uint32_t numSamples : 5;
            uint32_t _reserved : 21;
        };
        uint32_t bits;
    };
};
#define BLEND_ENABLE_MASK 0x3D // a2c | oMaskEnable | inputCoverageEnable | sampleMaskEnable
//////////////////////////////////////////////////////////////////////////
/// State required for blend jit
//////////////////////////////////////////////////////////////////////////
struct BLEND_COMPILE_STATE
{
    SWR_FORMAT                        format; // format of render target being blended
    RENDER_TARGET_BLEND_COMPILE_STATE blendState;
    BLEND_DESC                        desc;

    SWR_ZFUNCTION     alphaTestFunction;
    ALPHA_TEST_FORMAT alphaTestFormat;

    bool operator==(const BLEND_COMPILE_STATE& other) const
    {
        return memcmp(this, &other, sizeof(BLEND_COMPILE_STATE)) == 0;
    }

    // Canonicalize state to reduce unnecessary JIT compiles
    void Canonicalize()
    {
        if (!desc.alphaTestEnable)
        {
            alphaTestFormat   = (ALPHA_TEST_FORMAT)0;
            alphaTestFunction = (SWR_ZFUNCTION)0;
        }

        if (!blendState.blendEnable)
        {
            blendState.sourceAlphaBlendFactor = (SWR_BLEND_FACTOR)0;
            blendState.destAlphaBlendFactor   = (SWR_BLEND_FACTOR)0;
            blendState.sourceBlendFactor      = (SWR_BLEND_FACTOR)0;
            blendState.destBlendFactor        = (SWR_BLEND_FACTOR)0;
            blendState.colorBlendFunc         = (SWR_BLEND_OP)0;
            blendState.alphaBlendFunc         = (SWR_BLEND_OP)0;
        }

        if (!blendState.logicOpEnable)
        {
            blendState.logicOpFunc = (SWR_LOGIC_OP)0;
        }

        if (!blendState.blendEnable && !blendState.logicOpEnable)
        {
            format = (SWR_FORMAT)0;
        }

        if (!desc.independentAlphaBlendEnable)
        {
            blendState.sourceAlphaBlendFactor = (SWR_BLEND_FACTOR)0;
            blendState.destAlphaBlendFactor   = (SWR_BLEND_FACTOR)0;
            blendState.alphaBlendFunc         = (SWR_BLEND_OP)0;
        }
    }
};