kc3-lang/SDL/src/video/offscreen/SDL_offscreenvideo.c

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• Hash : 68985371
  Author :
  Date : 2019-09-24T16:36:48
  

  offscreen: Add new video driver backend Offscreen The Offscreen video driver is intended to be used for headless rendering as well as allows for multiple GPUs to be used for headless rendering Currently only supports EGL (OpenGL / ES) or Framebuffers Adds a hint to specifiy which EGL device to use: SDL_HINT_EGL_DEVICE Adds testoffscreen.c which can be used to test the backend out Disabled by default for now

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• src/video/offscreen/SDL_offscreenvideo.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  
  #include "../../SDL_internal.h"
  
  #if SDL_VIDEO_DRIVER_OFFSCREEN
  
  /* Offscreen video driver is similar to dummy driver, however its purpose
   * is enabling applications to use some of the SDL video functionality
   * (notably context creation) while not requiring a display output.
   *
   * An example would be running a graphical program on a headless box
   * for automated testing.
   */
  
  #include "SDL_video.h"
  #include "SDL_mouse.h"
  #include "../SDL_sysvideo.h"
  #include "../SDL_pixels_c.h"
  #include "../../events/SDL_events_c.h"
  
  #include "SDL_offscreenvideo.h"
  #include "SDL_offscreenevents_c.h"
  #include "SDL_offscreenframebuffer_c.h"
  #include "SDL_offscreenopengl.h"
  
  #define OFFSCREENVID_DRIVER_NAME "offscreen"
  
  /* Initialization/Query functions */
  static int OFFSCREEN_VideoInit(_THIS);
  static int OFFSCREEN_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
  static void OFFSCREEN_VideoQuit(_THIS);
  
  /* OFFSCREEN driver bootstrap functions */
  
  static int
  OFFSCREEN_Available(void)
  {
      /* Consider it always available */
      return (1);
  }
  
  static void
  OFFSCREEN_DeleteDevice(SDL_VideoDevice * device)
  {
      SDL_free(device);
  }
  
  static SDL_VideoDevice *
  OFFSCREEN_CreateDevice(int devindex)
  {
      SDL_VideoDevice *device;
  
      /* Initialize all variables that we clean on shutdown */
      device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
      if (!device) {
          SDL_OutOfMemory();
          return (0);
      }
  
      /* General video */
      device->VideoInit = OFFSCREEN_VideoInit;
      device->VideoQuit = OFFSCREEN_VideoQuit;
      device->SetDisplayMode = OFFSCREEN_SetDisplayMode;
      device->PumpEvents = OFFSCREEN_PumpEvents;
      device->CreateWindowFramebuffer = SDL_OFFSCREEN_CreateWindowFramebuffer;
      device->UpdateWindowFramebuffer = SDL_OFFSCREEN_UpdateWindowFramebuffer;
      device->DestroyWindowFramebuffer = SDL_OFFSCREEN_DestroyWindowFramebuffer;
      device->free = OFFSCREEN_DeleteDevice;
  
      /* GL context */
      device->GL_SwapWindow = OFFSCREEN_GL_SwapWindow;
      device->GL_MakeCurrent = OFFSCREEN_GL_MakeCurrent;
      device->GL_CreateContext = OFFSCREEN_GL_CreateContext;
      device->GL_DeleteContext = OFFSCREEN_GL_DeleteContext;
      device->GL_LoadLibrary = OFFSCREEN_GL_LoadLibrary;
      device->GL_UnloadLibrary = OFFSCREEN_GL_UnloadLibrary;
      device->GL_GetProcAddress = OFFSCREEN_GL_GetProcAddress;
      device->GL_GetSwapInterval = OFFSCREEN_GL_GetSwapInterval;
      device->GL_SetSwapInterval = OFFSCREEN_GL_SetSwapInterval;
  
      /* "Window" */
      device->CreateSDLWindow = OFFSCREEN_CreateWindow;
      device->DestroyWindow = OFFSCREEN_DestroyWindow;
  
      return device;
  }
  
  VideoBootStrap OFFSCREEN_bootstrap = {
      OFFSCREENVID_DRIVER_NAME, "SDL offscreen video driver",
      OFFSCREEN_Available, OFFSCREEN_CreateDevice
  };
  
  static Uint32
  OFFSCREEN_GetGlobalMouseState(int *x, int *y)
  {
      if (x) {
          *x = 0;
      }
  
      if (y) {
          *y = 0;
      }
      return 0;
  }
  
  int
  OFFSCREEN_VideoInit(_THIS)
  {
      SDL_DisplayMode mode;
      SDL_Mouse *mouse = NULL;
  
      /* Use a fake 32-bpp desktop mode */
      mode.format = SDL_PIXELFORMAT_RGB888;
      mode.w = 1024;
      mode.h = 768;
      mode.refresh_rate = 0;
      mode.driverdata = NULL;
      if (SDL_AddBasicVideoDisplay(&mode) < 0) {
          return -1;
      }
  
      SDL_zero(mode);
      SDL_AddDisplayMode(&_this->displays[0], &mode);
  
      /* Init mouse */
      mouse = SDL_GetMouse();
      /* This function needs to be implemented by every driver */
      mouse->GetGlobalMouseState = OFFSCREEN_GetGlobalMouseState;
      
      /* We're done! */
      return 0;
  }
  
  static int
  OFFSCREEN_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
  {
      return 0;
  }
  
  void
  OFFSCREEN_VideoQuit(_THIS)
  {
  }
  
  #endif /* SDL_VIDEO_DRIVER_OFFSCREEN */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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