Mercurial > sdl-ios-xcode

annotate src/video/dummy/SDL_nullvideo.c @ 3473:7bdc10624cba

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This is terrible, but the OpenGL standard says that lines are half open, which means that one endpoint is not covered so adjoining lines don't overlap. It also doesn't define which end is open, and indeed Mac OS X and Linux differ. Mac OS X seems to leave the second endpoint open, but Linux uses the right-most endpoint for x major lines and the bottom-most endpoint for y major lines.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Nov 2009 07:14:21 +0000
parents 99210400e8b9
children 83518f8fcd61
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 #include "SDL_nullrender_c.h"
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48
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49 #define DUMMYVID_DRIVER_NAME "dummy"
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50
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51 /* Initialization/Query functions */
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52 static int DUMMY_VideoInit(_THIS);
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53 static int DUMMY_SetDisplayMode(_THIS, SDL_DisplayMode * mode);
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54 static void DUMMY_VideoQuit(_THIS);
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55
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56 /* DUMMY driver bootstrap functions */
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57
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58 static int
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59 DUMMY_Available(void)
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60 {
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61 const char *envr = SDL_getenv("SDL_VIDEODRIVER");
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62 if ((envr) && (SDL_strcmp(envr, DUMMYVID_DRIVER_NAME) == 0)) {
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63 return (1);
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64 }
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65
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66 return (0);
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67 }
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68
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69 static void
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70 DUMMY_DeleteDevice(SDL_VideoDevice * device)
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71 {
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72 SDL_free(device);
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73 }
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74
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75 static SDL_VideoDevice *
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76 DUMMY_CreateDevice(int devindex)
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77 {
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78 SDL_VideoDevice *device;
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79
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80 /* Initialize all variables that we clean on shutdown */
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81 device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
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82 if (!device) {
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83 SDL_OutOfMemory();
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84 if (device) {
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85 SDL_free(device);
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86 }
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87 return (0);
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88 }
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89
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90 /* Set the function pointers */
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91 device->VideoInit = DUMMY_VideoInit;
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92 device->VideoQuit = DUMMY_VideoQuit;
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93 device->SetDisplayMode = DUMMY_SetDisplayMode;
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94 device->PumpEvents = DUMMY_PumpEvents;
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95
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96 device->free = DUMMY_DeleteDevice;
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97
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98 return device;
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99 }
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100
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101 VideoBootStrap DUMMY_bootstrap = {
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102 DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
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103 DUMMY_Available, DUMMY_CreateDevice
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104 };
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105
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106
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107 int
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108 DUMMY_VideoInit(_THIS)
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109 {
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110 SDL_DisplayMode mode;
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111
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112 /* Use a fake 32-bpp desktop mode */
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113 mode.format = SDL_PIXELFORMAT_RGB888;
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114 mode.w = 1024;
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115 mode.h = 768;
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116 mode.refresh_rate = 0;
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117 mode.driverdata = NULL;
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118 SDL_AddBasicVideoDisplay(&mode);
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119 SDL_AddRenderDriver(0, &SDL_DUMMY_RenderDriver);
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120
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121 SDL_zero(mode);
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122 SDL_AddDisplayMode(0, &mode);
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123
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124 /* We're done! */
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125 return 0;
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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_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: */