SDL 2.0
SDL_nullvideo.c
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1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2019 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"
49
50#define DUMMYVID_DRIVER_NAME "dummy"
51
52/* Initialization/Query functions */
53static int DUMMY_VideoInit(_THIS);
54static int DUMMY_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
55static void DUMMY_VideoQuit(_THIS);
56
57/* DUMMY driver bootstrap functions */
58
59static int
60DUMMY_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
70static void
71DUMMY_DeleteDevice(SDL_VideoDevice * device)
72{
74}
75
76static SDL_VideoDevice *
77DUMMY_CreateDevice(int devindex)
78{
80
81 /* Initialize all variables that we clean on shutdown */
83 if (!device) {
85 return (0);
86 }
87 device->is_dummy = SDL_TRUE;
88
89 /* Set the function pointers */
90 device->VideoInit = DUMMY_VideoInit;
91 device->VideoQuit = DUMMY_VideoQuit;
92 device->SetDisplayMode = DUMMY_SetDisplayMode;
93 device->PumpEvents = DUMMY_PumpEvents;
94 device->CreateWindowFramebuffer = SDL_DUMMY_CreateWindowFramebuffer;
95 device->UpdateWindowFramebuffer = SDL_DUMMY_UpdateWindowFramebuffer;
96 device->DestroyWindowFramebuffer = SDL_DUMMY_DestroyWindowFramebuffer;
97
98 device->free = DUMMY_DeleteDevice;
99
100 return device;
101}
102
104 DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
105 DUMMY_Available, DUMMY_CreateDevice
106};
107
108
109int
110DUMMY_VideoInit(_THIS)
111{
113
114 /* Use a fake 32-bpp desktop mode */
116 mode.w = 1024;
117 mode.h = 768;
118 mode.refresh_rate = 0;
119 mode.driverdata = NULL;
120 if (SDL_AddBasicVideoDisplay(&mode) < 0) {
121 return -1;
122 }
123
124 SDL_zero(mode);
126
127 /* We're done! */
128 return 0;
129}
130
131static int
132DUMMY_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
133{
134 return 0;
135}
136
137void
138DUMMY_VideoQuit(_THIS)
139{
140}
141
142#endif /* SDL_VIDEO_DRIVER_DUMMY */
143
144/* vi: set ts=4 sw=4 expandtab: */
#define _THIS
#define SDL_getenv
#define SDL_free
#define SDL_strcmp
#define SDL_calloc
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
void DUMMY_PumpEvents(_THIS)
int SDL_DUMMY_CreateWindowFramebuffer(_THIS, SDL_Window *window, Uint32 *format, void **pixels, int *pitch)
int SDL_DUMMY_UpdateWindowFramebuffer(_THIS, SDL_Window *window, const SDL_Rect *rects, int numrects)
void SDL_DUMMY_DestroyWindowFramebuffer(_THIS, SDL_Window *window)
GLenum mode
@ SDL_PIXELFORMAT_RGB888
Definition: SDL_pixels.h:236
#define SDL_zero(x)
Definition: SDL_stdinc.h:416
@ SDL_TRUE
Definition: SDL_stdinc.h:164
VideoBootStrap DUMMY_bootstrap
int SDL_AddBasicVideoDisplay(const SDL_DisplayMode *desktop_mode)
Definition: SDL_video.c:589
SDL_bool SDL_AddDisplayMode(SDL_VideoDisplay *display, const SDL_DisplayMode *mode)
Definition: SDL_video.c:751
static SDL_VideoDevice * _this
Definition: SDL_video.c:118
#define NULL
Definition: begin_code.h:167
static SDL_AudioDeviceID device
Definition: loopwave.c:37
The structure that defines a display mode.
Definition: SDL_video.h:54
SDL_VideoDisplay * displays
Definition: SDL_sysvideo.h:316