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FORK: Simple Directmedia Layer
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SDL_nullvideo.c (4224B)

      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 #include "../../SDL_internal.h"
     22 
     23 #if SDL_VIDEO_DRIVER_DUMMY
     24 
     25 /* Dummy SDL video driver implementation; this is just enough to make an
     26  *  SDL-based application THINK it's got a working video driver, for
     27  *  applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,
     28  *  and also for use as a collection of stubs when porting SDL to a new
     29  *  platform for which you haven't yet written a valid video driver.
     30  *
     31  * This is also a great way to determine bottlenecks: if you think that SDL
     32  *  is a performance problem for a given platform, enable this driver, and
     33  *  then see if your application runs faster without video overhead.
     34  *
     35  * Initial work by Ryan C. Gordon (icculus@icculus.org). A good portion
     36  *  of this was cut-and-pasted from Stephane Peter's work in the AAlib
     37  *  SDL video driver.  Renamed to "DUMMY" by Sam Lantinga.
     38  */
     39 
     40 #include "SDL_video.h"
     41 #include "SDL_mouse.h"
     42 #include "../SDL_sysvideo.h"
     43 #include "../SDL_pixels_c.h"
     44 #include "../../events/SDL_events_c.h"
     45 
     46 #include "SDL_nullvideo.h"
     47 #include "SDL_nullevents_c.h"
     48 #include "SDL_nullframebuffer_c.h"
     49 
     50 #define DUMMYVID_DRIVER_NAME "dummy"
     51 
     52 /* Initialization/Query functions */
     53 static int DUMMY_VideoInit(_THIS);
     54 static int DUMMY_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
     55 static void DUMMY_VideoQuit(_THIS);
     56 
     57 /* DUMMY driver bootstrap functions */
     58 
     59 static int
     60 DUMMY_Available(void)
     61 {
     62     const char *envr = SDL_getenv("SDL_VIDEODRIVER");
     63     if ((envr) && (SDL_strcmp(envr, DUMMYVID_DRIVER_NAME) == 0)) {
     64         return (1);
     65     }
     66 
     67     return (0);
     68 }
     69 
     70 static void
     71 DUMMY_DeleteDevice(SDL_VideoDevice * device)
     72 {
     73     SDL_free(device);
     74 }
     75 
     76 static SDL_VideoDevice *
     77 DUMMY_CreateDevice(int devindex)
     78 {
     79     SDL_VideoDevice *device;
     80 
     81     if (!DUMMY_Available()) {
     82         return (0);
     83     }
     84 
     85     /* Initialize all variables that we clean on shutdown */
     86     device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
     87     if (!device) {
     88         SDL_OutOfMemory();
     89         return (0);
     90     }
     91     device->is_dummy = SDL_TRUE;
     92 
     93     /* Set the function pointers */
     94     device->VideoInit = DUMMY_VideoInit;
     95     device->VideoQuit = DUMMY_VideoQuit;
     96     device->SetDisplayMode = DUMMY_SetDisplayMode;
     97     device->PumpEvents = DUMMY_PumpEvents;
     98     device->CreateWindowFramebuffer = SDL_DUMMY_CreateWindowFramebuffer;
     99     device->UpdateWindowFramebuffer = SDL_DUMMY_UpdateWindowFramebuffer;
    100     device->DestroyWindowFramebuffer = SDL_DUMMY_DestroyWindowFramebuffer;
    101 
    102     device->free = DUMMY_DeleteDevice;
    103 
    104     return device;
    105 }
    106 
    107 VideoBootStrap DUMMY_bootstrap = {
    108     DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
    109     DUMMY_CreateDevice
    110 };
    111 
    112 
    113 int
    114 DUMMY_VideoInit(_THIS)
    115 {
    116     SDL_DisplayMode mode;
    117 
    118     /* Use a fake 32-bpp desktop mode */
    119     mode.format = SDL_PIXELFORMAT_RGB888;
    120     mode.w = 1024;
    121     mode.h = 768;
    122     mode.refresh_rate = 0;
    123     mode.driverdata = NULL;
    124     if (SDL_AddBasicVideoDisplay(&mode) < 0) {
    125         return -1;
    126     }
    127 
    128     SDL_zero(mode);
    129     SDL_AddDisplayMode(&_this->displays[0], &mode);
    130 
    131     /* We're done! */
    132     return 0;
    133 }
    134 
    135 static int
    136 DUMMY_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
    137 {
    138     return 0;
    139 }
    140 
    141 void
    142 DUMMY_VideoQuit(_THIS)
    143 {
    144 }
    145 
    146 #endif /* SDL_VIDEO_DRIVER_DUMMY */
    147 
    148 /* vi: set ts=4 sw=4 expandtab: */