sdl

FORK: Simple Directmedia Layer
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SDL_offscreenvideo.c (4295B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
      4 
      5   This software is provided 'as-is', without any express or implied
      6   warranty.  In no event will the authors be held liable for any damages
      7   arising from the use of this software.
      8 
      9   Permission is granted to anyone to use this software for any purpose,
     10   including commercial applications, and to alter it and redistribute it
     11   freely, subject to the following restrictions:
     12 
     13   1. The origin of this software must not be misrepresented; you must not
     14      claim that you wrote the original software. If you use this software
     15      in a product, an acknowledgment in the product documentation would be
     16      appreciated but is not required.
     17   2. Altered source versions must be plainly marked as such, and must not be
     18      misrepresented as being the original software.
     19   3. This notice may not be removed or altered from any source distribution.
     20 */
     21 
     22 #include "../../SDL_internal.h"
     23 
     24 #if SDL_VIDEO_DRIVER_OFFSCREEN
     25 
     26 /* Offscreen video driver is similar to dummy driver, however its purpose
     27  * is enabling applications to use some of the SDL video functionality
     28  * (notably context creation) while not requiring a display output.
     29  *
     30  * An example would be running a graphical program on a headless box
     31  * for automated testing.
     32  */
     33 
     34 #include "SDL_video.h"
     35 #include "SDL_mouse.h"
     36 #include "../SDL_sysvideo.h"
     37 #include "../SDL_pixels_c.h"
     38 #include "../../events/SDL_events_c.h"
     39 
     40 #include "SDL_offscreenvideo.h"
     41 #include "SDL_offscreenevents_c.h"
     42 #include "SDL_offscreenframebuffer_c.h"
     43 #include "SDL_offscreenopengl.h"
     44 
     45 #define OFFSCREENVID_DRIVER_NAME "offscreen"
     46 
     47 /* Initialization/Query functions */
     48 static int OFFSCREEN_VideoInit(_THIS);
     49 static int OFFSCREEN_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
     50 static void OFFSCREEN_VideoQuit(_THIS);
     51 
     52 /* OFFSCREEN driver bootstrap functions */
     53 
     54 static void
     55 OFFSCREEN_DeleteDevice(SDL_VideoDevice * device)
     56 {
     57     SDL_free(device);
     58 }
     59 
     60 static SDL_VideoDevice *
     61 OFFSCREEN_CreateDevice(int devindex)
     62 {
     63     SDL_VideoDevice *device;
     64 
     65     /* Initialize all variables that we clean on shutdown */
     66     device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
     67     if (!device) {
     68         SDL_OutOfMemory();
     69         return (0);
     70     }
     71 
     72     /* General video */
     73     device->VideoInit = OFFSCREEN_VideoInit;
     74     device->VideoQuit = OFFSCREEN_VideoQuit;
     75     device->SetDisplayMode = OFFSCREEN_SetDisplayMode;
     76     device->PumpEvents = OFFSCREEN_PumpEvents;
     77     device->CreateWindowFramebuffer = SDL_OFFSCREEN_CreateWindowFramebuffer;
     78     device->UpdateWindowFramebuffer = SDL_OFFSCREEN_UpdateWindowFramebuffer;
     79     device->DestroyWindowFramebuffer = SDL_OFFSCREEN_DestroyWindowFramebuffer;
     80     device->free = OFFSCREEN_DeleteDevice;
     81 
     82     /* GL context */
     83     device->GL_SwapWindow = OFFSCREEN_GL_SwapWindow;
     84     device->GL_MakeCurrent = OFFSCREEN_GL_MakeCurrent;
     85     device->GL_CreateContext = OFFSCREEN_GL_CreateContext;
     86     device->GL_DeleteContext = OFFSCREEN_GL_DeleteContext;
     87     device->GL_LoadLibrary = OFFSCREEN_GL_LoadLibrary;
     88     device->GL_UnloadLibrary = OFFSCREEN_GL_UnloadLibrary;
     89     device->GL_GetProcAddress = OFFSCREEN_GL_GetProcAddress;
     90     device->GL_GetSwapInterval = OFFSCREEN_GL_GetSwapInterval;
     91     device->GL_SetSwapInterval = OFFSCREEN_GL_SetSwapInterval;
     92 
     93     /* "Window" */
     94     device->CreateSDLWindow = OFFSCREEN_CreateWindow;
     95     device->DestroyWindow = OFFSCREEN_DestroyWindow;
     96 
     97     return device;
     98 }
     99 
    100 VideoBootStrap OFFSCREEN_bootstrap = {
    101     OFFSCREENVID_DRIVER_NAME, "SDL offscreen video driver",
    102     OFFSCREEN_CreateDevice
    103 };
    104 
    105 int
    106 OFFSCREEN_VideoInit(_THIS)
    107 {
    108     SDL_DisplayMode mode;
    109     SDL_Mouse *mouse = NULL;
    110 
    111     /* Use a fake 32-bpp desktop mode */
    112     mode.format = SDL_PIXELFORMAT_RGB888;
    113     mode.w = 1024;
    114     mode.h = 768;
    115     mode.refresh_rate = 0;
    116     mode.driverdata = NULL;
    117     if (SDL_AddBasicVideoDisplay(&mode) < 0) {
    118         return -1;
    119     }
    120 
    121     SDL_zero(mode);
    122     SDL_AddDisplayMode(&_this->displays[0], &mode);
    123 
    124     /* We're done! */
    125     return 0;
    126 }
    127 
    128 static int
    129 OFFSCREEN_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
    130 {
    131     return 0;
    132 }
    133 
    134 void
    135 OFFSCREEN_VideoQuit(_THIS)
    136 {
    137 }
    138 
    139 #endif /* SDL_VIDEO_DRIVER_OFFSCREEN */
    140 
    141 /* vi: set ts=4 sw=4 expandtab: */