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annotate src/video/dummy/SDL_nullvideo.c @ 5159:307ccc9c135e

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Made it possible to create a texture of any format, even if not supported by the renderer. This allows me to reduce the set of formats supported by the renderers to the most optimal set, for a nice speed boost.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 03 Feb 2011 00:19:40 -0800
parents fb424691cfc7
children 4d39eeaad00b
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Dummy SDL video driver implementation; this is just enough to make an
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25 * SDL-based application THINK it's got a working video driver, for
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26 * applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,
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27 * and also for use as a collection of stubs when porting SDL to a new
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28 * platform for which you haven't yet written a valid video driver.
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29 *
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30 * This is also a great way to determine bottlenecks: if you think that SDL
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31 * is a performance problem for a given platform, enable this driver, and
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32 * then see if your application runs faster without video overhead.
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33 *
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34 * Initial work by Ryan C. Gordon (icculus@icculus.org). A good portion
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35 * of this was cut-and-pasted from Stephane Peter's work in the AAlib
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36 * SDL video driver. Renamed to "DUMMY" by Sam Lantinga.
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37 */
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38
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39 #include "SDL_video.h"
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40 #include "SDL_mouse.h"
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41 #include "../SDL_sysvideo.h"
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42 #include "../SDL_pixels_c.h"
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43 #include "../../events/SDL_events_c.h"
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44
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45 #include "SDL_nullvideo.h"
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46 #include "SDL_nullevents_c.h"
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47
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48 #define DUMMYVID_DRIVER_NAME "dummy"
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49
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50 /* Initialization/Query functions */
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51 static int DUMMY_VideoInit(_THIS);
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52 static int DUMMY_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
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53 static void DUMMY_VideoQuit(_THIS);
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54
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55 /* DUMMY driver bootstrap functions */
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56
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57 static int
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58 DUMMY_Available(void)
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59 {
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60 const char *envr = SDL_getenv("SDL_VIDEODRIVER");
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61 if ((envr) && (SDL_strcmp(envr, DUMMYVID_DRIVER_NAME) == 0)) {
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62 return (1);
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63 }
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64
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65 return (0);
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66 }
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67
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68 static void
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69 DUMMY_DeleteDevice(SDL_VideoDevice * device)
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70 {
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71 SDL_free(device);
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72 }
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73
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74 static SDL_VideoDevice *
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75 DUMMY_CreateDevice(int devindex)
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76 {
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77 SDL_VideoDevice *device;
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78
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79 /* Initialize all variables that we clean on shutdown */
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80 device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
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81 if (!device) {
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82 SDL_OutOfMemory();
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83 if (device) {
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84 SDL_free(device);
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85 }
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86 return (0);
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87 }
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88
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89 /* Set the function pointers */
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90 device->VideoInit = DUMMY_VideoInit;
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91 device->VideoQuit = DUMMY_VideoQuit;
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92 device->SetDisplayMode = DUMMY_SetDisplayMode;
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93 device->PumpEvents = DUMMY_PumpEvents;
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94
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95 device->free = DUMMY_DeleteDevice;
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96
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97 return device;
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98 }
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99
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100 VideoBootStrap DUMMY_bootstrap = {
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101 DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
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102 DUMMY_Available, DUMMY_CreateDevice
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103 };
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104
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105
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106 int
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107 DUMMY_VideoInit(_THIS)
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108 {
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109 SDL_DisplayMode mode;
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110
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111 /* Use a fake 32-bpp desktop mode */
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112 mode.format = SDL_PIXELFORMAT_RGB888;
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113 mode.w = 1024;
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114 mode.h = 768;
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115 mode.refresh_rate = 0;
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116 mode.driverdata = NULL;
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117 if (SDL_AddBasicVideoDisplay(&mode) < 0) {
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118 return -1;
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119 }
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120
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121 SDL_zero(mode);
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122 SDL_AddDisplayMode(&_this->displays[0], &mode);
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123
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124 /* We're done! */
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125 return 0;
1
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126 }
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127
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128 static int
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129 DUMMY_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
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130 {
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131 return 0;
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132 }
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133
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134 void
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135 DUMMY_VideoQuit(_THIS)
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136 {
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137 }
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138
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139 /* vi: set ts=4 sw=4 expandtab: */