Framebuffer.h

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/* Copyright (C) 2022 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_GL_FRAMEBUFFER
#define INCLUDED_RENDERER_BACKEND_GL_FRAMEBUFFER

#include "graphics/Color.h"
#include "lib/ogl.h"
#include "renderer/backend/IFramebuffer.h"

#include <cstdint>
#include <memory>

namespace Renderer
{

namespace Backend
{

namespace GL
{

class CDevice;
class CTexture;

class CFramebuffer final : public IFramebuffer
{
public:
    ~CFramebuffer() override;

    IDevice* GetDevice() override;

    const CColor& GetClearColor() const override { return m_ClearColor; }

    uint32_t GetWidth() const override { return m_Width; }
    uint32_t GetHeight() const override { return m_Height; }

    GLuint GetHandle() const { return m_Handle; }
    GLbitfield GetAttachmentMask() const { return m_AttachmentMask; }

    AttachmentLoadOp GetColorAttachmentLoadOp() const { return m_ColorAttachmentLoadOp; }
    AttachmentStoreOp GetColorAttachmentStoreOp() const { return m_ColorAttachmentStoreOp; }
    AttachmentLoadOp GetDepthStencilAttachmentLoadOp() const { return m_DepthStencilAttachmentLoadOp; }
    AttachmentStoreOp GetDepthStencilAttachmentStoreOp() const { return m_DepthStencilAttachmentStoreOp; }

private:
    friend class CDevice;

    static std::unique_ptr<CFramebuffer> Create(
        CDevice* device, const char* name, SColorAttachment* colorAttachment,
        SDepthStencilAttachment* depthStencilAttachment);
    static std::unique_ptr<CFramebuffer> CreateBackbuffer(
        CDevice* device,
        const int surfaceDrawableWidth, const int surfaceDrawableHeight,
        const AttachmentLoadOp colorAttachmentLoadOp,
        const AttachmentStoreOp colorAttachmentStoreOp,
        const AttachmentLoadOp depthStencilAttachmentLoadOp,
        const AttachmentStoreOp depthStencilAttachmentStoreOp);

    CFramebuffer();

    CDevice* m_Device = nullptr;

    GLuint m_Handle = 0;
    uint32_t m_Width = 0, m_Height = 0;
    GLbitfield m_AttachmentMask = 0;

    CColor m_ClearColor;

    AttachmentLoadOp m_ColorAttachmentLoadOp = AttachmentLoadOp::DONT_CARE;
    AttachmentStoreOp m_ColorAttachmentStoreOp = AttachmentStoreOp::DONT_CARE;
    AttachmentLoadOp m_DepthStencilAttachmentLoadOp = AttachmentLoadOp::DONT_CARE;
    AttachmentStoreOp m_DepthStencilAttachmentStoreOp = AttachmentStoreOp::DONT_CARE;
};

} // namespace GL

} // namespace Backend

} // namespace Renderer

#endif // INCLUDED_RENDERER_BACKEND_GL_FRAMEBUFFER