winamp/src/duckstation-sdl/opengl_host_display.h

#pragma once
#include "common/gl/context.h"
#include "common/gl/program.h"
#include "common/gl/texture.h"
#include "core/host_display.h"
#include <SDL.h>
#include <memory>
#include <string>

class OpenGLHostDisplay final : public HostDisplay
{
public:
  OpenGLHostDisplay(SDL_Window* window);
  ~OpenGLHostDisplay();

  static std::unique_ptr<HostDisplay> Create(SDL_Window* window, bool debug_device);

  RenderAPI GetRenderAPI() const override;
  void* GetRenderDevice() const override;
  void* GetRenderContext() const override;
  void WindowResized(s32 new_window_width, s32 new_window_height) override;

  std::unique_ptr<HostDisplayTexture> CreateTexture(u32 width, u32 height, const void* data, u32 data_stride,
                                                    bool dynamic) override;
  void UpdateTexture(HostDisplayTexture* texture, u32 x, u32 y, u32 width, u32 height, const void* data,
                     u32 data_stride) override;
  bool DownloadTexture(const void* texture_handle, u32 x, u32 y, u32 width, u32 height, void* out_data,
                       u32 out_data_stride) override;

  void SetVSync(bool enabled) override;

  void Render() override;

private:
  const char* GetGLSLVersionString() const;
  std::string GetGLSLVersionHeader() const;

  bool CreateGLContext(bool debug_device);
  bool CreateImGuiContext();
  bool CreateGLResources();

  void RenderDisplay();

  SDL_Window* m_window = nullptr;
  std::unique_ptr<GL::Context> m_gl_context;

  GL::Program m_display_program;
  GLuint m_display_vao = 0;
  GLuint m_display_nearest_sampler = 0;
  GLuint m_display_linear_sampler = 0;
};