mirror of https://github.com/encounter/SDL.git
144 lines
4.1 KiB
C
144 lines
4.1 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#if SDL_VIDEO_DRIVER_DUMMY
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/* Dummy SDL video driver implementation; this is just enough to make an
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* SDL-based application THINK it's got a working video driver, for
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* applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,
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* and also for use as a collection of stubs when porting SDL to a new
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* platform for which you haven't yet written a valid video driver.
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*
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* This is also a great way to determine bottlenecks: if you think that SDL
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* is a performance problem for a given platform, enable this driver, and
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* then see if your application runs faster without video overhead.
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*
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* Initial work by Ryan C. Gordon (icculus@icculus.org). A good portion
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* of this was cut-and-pasted from Stephane Peter's work in the AAlib
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* SDL video driver. Renamed to "DUMMY" by Sam Lantinga.
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*/
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#include "SDL_video.h"
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#include "SDL_mouse.h"
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#include "../SDL_sysvideo.h"
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#include "../SDL_pixels_c.h"
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#include "../../events/SDL_events_c.h"
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#include "SDL_nullvideo.h"
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#include "SDL_nullevents_c.h"
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#include "SDL_nullframebuffer_c.h"
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#define DUMMYVID_DRIVER_NAME "dummy"
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/* Initialization/Query functions */
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static int DUMMY_VideoInit(_THIS);
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static int DUMMY_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
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static void DUMMY_VideoQuit(_THIS);
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/* DUMMY driver bootstrap functions */
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static int
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DUMMY_Available(void)
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{
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const char *envr = SDL_getenv("SDL_VIDEODRIVER");
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if ((envr) && (SDL_strcmp(envr, DUMMYVID_DRIVER_NAME) == 0)) {
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return (1);
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}
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return (0);
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}
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static void
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DUMMY_DeleteDevice(SDL_VideoDevice * device)
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{
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SDL_free(device);
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}
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static SDL_VideoDevice *
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DUMMY_CreateDevice(int devindex)
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{
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SDL_VideoDevice *device;
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/* Initialize all variables that we clean on shutdown */
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device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
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if (!device) {
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SDL_OutOfMemory();
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return (0);
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}
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/* Set the function pointers */
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device->VideoInit = DUMMY_VideoInit;
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device->VideoQuit = DUMMY_VideoQuit;
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device->SetDisplayMode = DUMMY_SetDisplayMode;
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device->PumpEvents = DUMMY_PumpEvents;
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device->CreateWindowFramebuffer = SDL_DUMMY_CreateWindowFramebuffer;
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device->UpdateWindowFramebuffer = SDL_DUMMY_UpdateWindowFramebuffer;
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device->DestroyWindowFramebuffer = SDL_DUMMY_DestroyWindowFramebuffer;
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device->free = DUMMY_DeleteDevice;
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return device;
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}
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VideoBootStrap DUMMY_bootstrap = {
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DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
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DUMMY_Available, DUMMY_CreateDevice
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};
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int
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DUMMY_VideoInit(_THIS)
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{
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SDL_DisplayMode mode;
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/* Use a fake 32-bpp desktop mode */
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mode.format = SDL_PIXELFORMAT_RGB888;
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mode.w = 1024;
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mode.h = 768;
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mode.refresh_rate = 0;
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mode.driverdata = NULL;
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if (SDL_AddBasicVideoDisplay(&mode) < 0) {
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return -1;
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}
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SDL_zero(mode);
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SDL_AddDisplayMode(&_this->displays[0], &mode);
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/* We're done! */
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return 0;
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}
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static int
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DUMMY_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
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{
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return 0;
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}
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void
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DUMMY_VideoQuit(_THIS)
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{
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}
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#endif /* SDL_VIDEO_DRIVER_DUMMY */
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/* vi: set ts=4 sw=4 expandtab: */
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