RenderPassManager.h

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/* Copyright (C) 2023 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * 0 A.D. is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef INCLUDED_RENDERER_BACKEND_VULKAN_RENDERPASSMANAGER
#define INCLUDED_RENDERER_BACKEND_VULKAN_RENDERPASSMANAGER

#include "renderer/backend/IFramebuffer.h"

#include <glad/vulkan.h>
#include <optional>
#include <unordered_map>
#include <vector>

namespace Renderer
{

namespace Backend
{

namespace Vulkan
{

class CDevice;

/**
 * A helper class to store unique render passes.
 */
class CRenderPassManager
{
public:
    CRenderPassManager(CDevice* device);
    ~CRenderPassManager();

    /**
     * @return a renderpass with required attachments. Currently we use only
     * single subpass renderpasses.
     * @note it should be called as rarely as possible.
     */
    VkRenderPass GetOrCreateRenderPass(
        SColorAttachment* colorAttachment,
        SDepthStencilAttachment* depthStencilAttachment);

private:
    CDevice* m_Device = nullptr;

    struct Attachment
    {
        VkFormat format;
        AttachmentLoadOp loadOp;
        AttachmentStoreOp storeOp;
    };
    struct Desc
    {
        uint8_t sampleCount;
        std::optional<Attachment> colorAttachment;
        std::optional<Attachment> depthStencilAttachment;
    };
    struct DescHash
    {
        size_t operator()(const Desc& desc) const;
    };
    struct DescEqual
    {
        bool operator()(const Desc& lhs, const Desc& rhs) const;
    };
    std::unordered_map<Desc, VkRenderPass, DescHash, DescEqual> m_RenderPassMap;
};

} // namespace Vulkan

} // namespace Backend

} // namespace Renderer

#endif // INCLUDED_RENDERER_BACKEND_VULKAN_RENDERPASSMANAGER