dolphin/Source/Core/VideoBackends/Metal/MTLTexture.h

// Copyright 2022 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#pragma once

#include <Metal/Metal.h>

#include "VideoCommon/AbstractFramebuffer.h"
#include "VideoCommon/AbstractStagingTexture.h"
#include "VideoCommon/AbstractTexture.h"

#include "VideoBackends/Metal/MRCHelpers.h"

namespace Metal
{
class Texture final : public AbstractTexture
{
public:
  explicit Texture(MRCOwned<id<MTLTexture>> tex, const TextureConfig& config);
  ~Texture();

  void CopyRectangleFromTexture(const AbstractTexture* src,
                                const MathUtil::Rectangle<int>& src_rect, u32 src_layer,
                                u32 src_level, const MathUtil::Rectangle<int>& dst_rect,
                                u32 dst_layer, u32 dst_level) override;
  void ResolveFromTexture(const AbstractTexture* src, const MathUtil::Rectangle<int>& rect,
                          u32 layer, u32 level) override;
  void Load(u32 level, u32 width, u32 height, u32 row_length, const u8* buffer, size_t buffer_size,
            u32 layer) override;

  id<MTLTexture> GetMTLTexture() const { return m_tex; }

private:
  MRCOwned<id<MTLTexture>> m_tex;
};

class StagingTexture final : public AbstractStagingTexture
{
public:
  StagingTexture(MRCOwned<id<MTLBuffer>> buffer, StagingTextureType type,
                 const TextureConfig& config);
  ~StagingTexture();

  void CopyFromTexture(const AbstractTexture* src, const MathUtil::Rectangle<int>& src_rect,
                       u32 src_layer, u32 src_level,
                       const MathUtil::Rectangle<int>& dst_rect) override;
  void CopyToTexture(const MathUtil::Rectangle<int>& src_rect, AbstractTexture* dst,
                     const MathUtil::Rectangle<int>& dst_rect, u32 dst_layer,
                     u32 dst_level) override;

  bool Map() override;
  void Unmap() override;
  void Flush() override;

private:
  MRCOwned<id<MTLBuffer>> m_buffer;
  MRCOwned<id<MTLCommandBuffer>> m_wait_buffer;
};

class Framebuffer final : public AbstractFramebuffer
{
public:
  Framebuffer(AbstractTexture* color, AbstractTexture* depth,
              std::vector<AbstractTexture*> additonal_color_textures,  //
              u32 width, u32 height, u32 layers, u32 samples);
  ~Framebuffer();

  MTLRenderPassDescriptor* PassDesc() const { return m_pass_descriptor; }

  size_t NumAdditionalColorTextures() const { return m_additional_color_textures.size(); }

  void SetLoadAction(MTLLoadAction action)
  {
    if (m_current_load_action != action)
      ActualSetLoadAction(action);
  }

  void UpdateBackbufferTexture(id<MTLTexture> tex)
  {
    [m_pass_descriptor colorAttachments][0].texture = tex;
  }

private:
  MRCOwned<MTLRenderPassDescriptor*> m_pass_descriptor;
  std::vector<AbstractTexture*> m_additional_color_textures;
  MTLLoadAction m_current_load_action = MTLLoadActionLoad;
  void ActualSetLoadAction(MTLLoadAction action);
};
}  // namespace Metal