axmol/cocos/renderer/backend/RenderPassDescriptor.h

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

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#pragma once

#include <array>
#include <vector>

#include "Macros.h"
#include "Types.h"

CC_BACKEND_BEGIN

class TextureBackend;
/**
 * @addtogroup _backend
 * @{
 */

struct RenderPassFlags {
    /**
     * bitmask indicating which buffers to clear at the beginning of a render pass.
     * This implies discard.
     */
    TargetBufferFlags clear;

    /**
     * bitmask indicating which buffers to discard at the beginning of a render pass.
     * Discarded buffers have uninitialized content, they must be entirely drawn over or cleared.
     */
    TargetBufferFlags discardStart;

    /**
     * bitmask indicating which buffers to discard at the end of a render pass.
     * Discarded buffers' content becomes invalid, they must not be read from again.
     */
    TargetBufferFlags discardEnd;
};


/**
 * Store values about color, depth and stencil attachment.
 */
struct RenderPassDescriptor
{
    RenderPassDescriptor& operator=(const RenderPassDescriptor& descriptor) = default;
    bool operator==(const RenderPassDescriptor& descriptor) const;

    float clearDepthValue = 0.f;
    float clearStencilValue = 0.f;
    std::array<float, 4> clearColorValue {{0.f, 0.f, 0.f, 0.f}}; // double-braces required in C++11
    
    // Now, only clear flag used
    RenderPassFlags flags{};
};
//end of _backend group
/// @}
CC_BACKEND_END