Implement AbstractGfx for OpenGL

Mostly involves moving contents of OGLRender
to OGLGfx and OGLConfig

Source/Core/VideoBackends/OGL/OGLGfx.h

@@ -0,0 +1,118 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "VideoCommon/AbstractGfx.h"
+
+class GLContext;
+
+namespace OGL
+{
+class OGLFramebuffer;
+class OGLTexture;
+
+class OGLGfx final : public AbstractGfx
+{
+public:
+  OGLGfx(std::unique_ptr<GLContext> main_gl_context, float backbuffer_scale);
+  ~OGLGfx();
+
+  bool IsHeadless() const override;
+
+  std::unique_ptr<AbstractTexture> CreateTexture(const TextureConfig& config,
+                                                 std::string_view name) override;
+  std::unique_ptr<AbstractStagingTexture>
+  CreateStagingTexture(StagingTextureType type, const TextureConfig& config) override;
+  std::unique_ptr<AbstractShader> CreateShaderFromSource(ShaderStage stage, std::string_view source,
+                                                         std::string_view name) override;
+  std::unique_ptr<AbstractShader> CreateShaderFromBinary(ShaderStage stage, const void* data,
+                                                         size_t length,
+                                                         std::string_view name) override;
+  std::unique_ptr<NativeVertexFormat>
+  CreateNativeVertexFormat(const PortableVertexDeclaration& vtx_decl) override;
+  std::unique_ptr<AbstractPipeline> CreatePipeline(const AbstractPipelineConfig& config,
+                                                   const void* cache_data = nullptr,
+                                                   size_t cache_data_length = 0) override;
+  std::unique_ptr<AbstractFramebuffer>
+  CreateFramebuffer(AbstractTexture* color_attachment, AbstractTexture* depth_attachment) override;
+
+  void SetPipeline(const AbstractPipeline* pipeline) override;
+  void SetFramebuffer(AbstractFramebuffer* framebuffer) override;
+  void SetAndDiscardFramebuffer(AbstractFramebuffer* framebuffer) override;
+  void SetAndClearFramebuffer(AbstractFramebuffer* framebuffer, const ClearColor& color_value = {},
+                              float depth_value = 0.0f) override;
+  void ClearRegion(const MathUtil::Rectangle<int>& rc, const MathUtil::Rectangle<int>& target_rc,
+                   bool colorEnable, bool alphaEnable, bool zEnable, u32 color, u32 z) override;
+  void SetScissorRect(const MathUtil::Rectangle<int>& rc) override;
+  void SetTexture(u32 index, const AbstractTexture* texture) override;
+  void SetSamplerState(u32 index, const SamplerState& state) override;
+  void SetComputeImageTexture(AbstractTexture* texture, bool read, bool write) override;
+  void UnbindTexture(const AbstractTexture* texture) override;
+  void SetViewport(float x, float y, float width, float height, float near_depth,
+                   float far_depth) override;
+  void Draw(u32 base_vertex, u32 num_vertices) override;
+  void DrawIndexed(u32 base_index, u32 num_indices, u32 base_vertex) override;
+  void DispatchComputeShader(const AbstractShader* shader, u32 groupsize_x, u32 groupsize_y,
+                             u32 groupsize_z, u32 groups_x, u32 groups_y, u32 groups_z) override;
+  void BindBackbuffer(const ClearColor& clear_color = {}) override;
+  void PresentBackbuffer() override;
+
+  void BeginUtilityDrawing() override;
+  void EndUtilityDrawing() override;
+
+  void Flush() override;
+  void WaitForGPUIdle() override;
+  void OnConfigChanged(u32 bits) override;
+
+  virtual void SelectLeftBuffer() override;
+  virtual void SelectRightBuffer() override;
+  virtual void SelectMainBuffer() override;
+
+  std::unique_ptr<VideoCommon::AsyncShaderCompiler> CreateAsyncShaderCompiler() override;
+
+  // Only call methods from this on the GPU thread.
+  GLContext* GetMainGLContext() const { return m_main_gl_context.get(); }
+  bool IsGLES() const;
+
+  // Invalidates a cached texture binding. Required for texel buffers when they borrow the units.
+  void InvalidateTextureBinding(u32 index) { m_bound_textures[index] = nullptr; }
+
+  // The shared framebuffer exists for copying textures when extensions are not available. It is
+  // slower, but the only way to do these things otherwise.
+  u32 GetSharedReadFramebuffer() const { return m_shared_read_framebuffer; }
+  u32 GetSharedDrawFramebuffer() const { return m_shared_draw_framebuffer; }
+  void BindSharedReadFramebuffer();
+  void BindSharedDrawFramebuffer();
+
+  // Restores FBO binding after it's been changed.
+  void RestoreFramebufferBinding();
+
+  SurfaceInfo GetSurfaceInfo() const override;
+
+private:
+  void CheckForSurfaceChange();
+  void CheckForSurfaceResize();
+
+  void ApplyRasterizationState(const RasterizationState state);
+  void ApplyDepthState(const DepthState state);
+  void ApplyBlendingState(const BlendingState state);
+
+  std::unique_ptr<GLContext> m_main_gl_context;
+  std::unique_ptr<OGLFramebuffer> m_system_framebuffer;
+  std::array<const OGLTexture*, 8> m_bound_textures{};
+  AbstractTexture* m_bound_image_texture = nullptr;
+  RasterizationState m_current_rasterization_state;
+  DepthState m_current_depth_state;
+  BlendingState m_current_blend_state;
+  u32 m_shared_read_framebuffer = 0;
+  u32 m_shared_draw_framebuffer = 0;
+  float m_backbuffer_scale;
+};
+
+inline OGLGfx* GetOGLGfx()
+{
+  return static_cast<OGLGfx*>(g_gfx.get());
+}
+
+}  // namespace OGL