src/video/dummy/SDL_nullvideo.c
author Ryan C. Gordon <icculus@icculus.org>
Mon, 09 Apr 2012 23:55:43 -0400
changeset 6305 601b0e251822
parent 6138 4c64952a58fb
child 6885 700f1b25f77f
permissions -rwxr-xr-x
SDL_ExitProcess() was ignoring exit code parameter.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2012 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_config.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     /* Initialize all variables that we clean on shutdown */
    82     device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
    83     if (!device) {
    84         SDL_OutOfMemory();
    85         if (device) {
    86             SDL_free(device);
    87         }
    88         return (0);
    89     }
    90 
    91     /* Set the function pointers */
    92     device->VideoInit = DUMMY_VideoInit;
    93     device->VideoQuit = DUMMY_VideoQuit;
    94     device->SetDisplayMode = DUMMY_SetDisplayMode;
    95     device->PumpEvents = DUMMY_PumpEvents;
    96     device->CreateWindowFramebuffer = SDL_DUMMY_CreateWindowFramebuffer;
    97     device->UpdateWindowFramebuffer = SDL_DUMMY_UpdateWindowFramebuffer;
    98     device->DestroyWindowFramebuffer = SDL_DUMMY_DestroyWindowFramebuffer;
    99 
   100     device->free = DUMMY_DeleteDevice;
   101 
   102     return device;
   103 }
   104 
   105 VideoBootStrap DUMMY_bootstrap = {
   106     DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
   107     DUMMY_Available, DUMMY_CreateDevice
   108 };
   109 
   110 
   111 int
   112 DUMMY_VideoInit(_THIS)
   113 {
   114     SDL_DisplayMode mode;
   115 
   116     /* Use a fake 32-bpp desktop mode */
   117     mode.format = SDL_PIXELFORMAT_RGB888;
   118     mode.w = 1024;
   119     mode.h = 768;
   120     mode.refresh_rate = 0;
   121     mode.driverdata = NULL;
   122     if (SDL_AddBasicVideoDisplay(&mode) < 0) {
   123         return -1;
   124     }
   125 
   126     SDL_zero(mode);
   127     SDL_AddDisplayMode(&_this->displays[0], &mode);
   128 
   129     /* We're done! */
   130     return 0;
   131 }
   132 
   133 static int
   134 DUMMY_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
   135 {
   136     return 0;
   137 }
   138 
   139 void
   140 DUMMY_VideoQuit(_THIS)
   141 {
   142 }
   143 
   144 #endif /* SDL_VIDEO_DRIVER_DUMMY */
   145 
   146 /* vi: set ts=4 sw=4 expandtab: */