src/video/sdl2_opengl_v.h

   1 /*
   2  * This file is part of OpenTTD.
   3  * OpenTTD 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, version 2.
   4  * OpenTTD 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.
   5  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   6  */
   7
   8 /** @file sdl2_opengl_v.h OpenGL backend of the SDL2 video driver. */
   9
  10 #include "sdl2_v.h"
  11
  12 /** The OpenGL video driver for windows. */
  13 class VideoDriver_SDL_OpenGL : public VideoDriver_SDL_Base {
  14 public:
  15         VideoDriver_SDL_OpenGL() : VideoDriver_SDL_Base(true), gl_context(nullptr), anim_buffer(nullptr) {}
  16
  17         std::optional<std::string_view> Start(const StringList &param) override;
  18
  19         void Stop() override;
  20
  21         bool HasEfficient8Bpp() const override { return true; }
  22
  23         bool UseSystemCursor() override { return true; }
  24
  25         void ClearSystemSprites() override;
  26
  27         void PopulateSystemSprites() override;
  28
  29         bool HasAnimBuffer() override { return true; }
  30         uint8_t *GetAnimBuffer() override { return this->anim_buffer; }
  31
  32         void ToggleVsync(bool vsync) override;
  33
  34         std::string_view GetName() const override { return "sdl-opengl"; }
  35
  36 protected:
  37         bool AllocateBackingStore(int w, int h, bool force = false) override;
  38         void *GetVideoPointer() override;
  39         void ReleaseVideoPointer() override;
  40         void Paint() override;
  41         bool CreateMainWindow(uint w, uint h, uint flags) override;
  42
  43 private:
  44         void  *gl_context;  ///< OpenGL context.
  45         uint8_t *anim_buffer; ///< Animation buffer from OpenGL back-end.
  46
  47         std::optional<std::string_view> AllocateContext();
  48         void DestroyContext();
  49 };
  50
  51 /** The factory for SDL' OpenGL video driver. */
  52 class FVideoDriver_SDL_OpenGL : public DriverFactoryBase {
  53 public:
  54         FVideoDriver_SDL_OpenGL() : DriverFactoryBase(Driver::DT_VIDEO, 8, "sdl-opengl", "SDL OpenGL Video Driver") {}
  55         /* virtual */ Driver *CreateInstance() const override { return new VideoDriver_SDL_OpenGL(); }
  56
  57 protected:
  58         bool UsesHardwareAcceleration() const override { return true; }
  59 };