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annotate src/thread/dc/SDL_syssem.c @ 1554:0ca607a5d173

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Fixed bug #84 Date: Sun, 23 Oct 2005 16:39:03 +0200 From: "A. Schmid" <sahib@phreaker.net> Subject: [SDL] no software surfaces with svgalib driver? Hi, I noticed that the SDL (1.2.9) svgalib driver only makes use of linear addressable (framebuffer) video modes. On older systems (like one of mine), linear addressable modes are often not available. Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is unusable, since VESA only supports framebuffering for VBE 2.0 and later. The changes necessary to add support for software surfaces seem to be relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see attached patch). The code worked fine for me, but it is no more than a proof of concept and should be reviewed (probably has a memory leak when switching modes). It also uses the vgagl library (included in the svgalib package) and needs to be linked against it. -Alex
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 Mar 2006 12:04:40 +0000
parents d910939febfa
children 782fd950bd46 536b0704b7d8
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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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18
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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 /* An implementation of semaphores using mutexes and condition variables */
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25
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26 #include "SDL_timer.h"
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27 #include "SDL_thread.h"
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28 #include "SDL_systhread_c.h"
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29
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30
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31 #if SDL_THREADS_DISABLED
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32
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33 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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34 {
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35 SDL_SetError("SDL not configured with thread support");
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36 return (SDL_sem *)0;
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37 }
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38
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39 void SDL_DestroySemaphore(SDL_sem *sem)
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40 {
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41 return;
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42 }
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43
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44 int SDL_SemTryWait(SDL_sem *sem)
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45 {
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46 SDL_SetError("SDL not configured with thread support");
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47 return -1;
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48 }
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49
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50 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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51 {
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52 SDL_SetError("SDL not configured with thread support");
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53 return -1;
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54 }
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55
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56 int SDL_SemWait(SDL_sem *sem)
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57 {
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58 SDL_SetError("SDL not configured with thread support");
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59 return -1;
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60 }
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61
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62 Uint32 SDL_SemValue(SDL_sem *sem)
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63 {
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64 return 0;
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65 }
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66
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67 int SDL_SemPost(SDL_sem *sem)
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68 {
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69 SDL_SetError("SDL not configured with thread support");
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70 return -1;
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71 }
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72
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73 #else
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74
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75 #include <kos/sem.h>
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76
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77 struct SDL_semaphore
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78 {
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79 semaphore_t sem;
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80 };
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81
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82 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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83 {
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84 return (SDL_sem *)sem_create(initial_value);
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85 }
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86
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87 /* WARNING:
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88 You cannot call this function when another thread is using the semaphore.
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89 */
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90 void SDL_DestroySemaphore(SDL_sem *sem)
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91 {
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92 if ( ! sem ) {
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93 SDL_SetError("Passed a NULL semaphore");
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94 return;
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95 }
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96
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97 sem_destroy(&sem->sem);
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98 }
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99
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100 int SDL_SemTryWait(SDL_sem *sem)
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101 {
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102 int retval;
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103
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104 if ( ! sem ) {
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105 SDL_SetError("Passed a NULL semaphore");
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106 return -1;
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107 }
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108
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109 retval = sem_trywait(&sem->sem);
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110 if (retval==0) return 0;
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111 else return SDL_MUTEX_TIMEDOUT;
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112
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113 return retval;
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114 }
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115
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116 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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117 {
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118 int retval;
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119
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120 if ( ! sem ) {
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121 SDL_SetError("Passed a NULL semaphore");
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122 return -1;
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123 }
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124
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125 /* A timeout of 0 is an easy case */
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126 if ( timeout == 0 ) {
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127 return SDL_SemTryWait(sem);
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128 }
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129
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130 retval = sem_wait_timed(&sem->sem,timeout);
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131 if (retval==-1) retval= SDL_MUTEX_TIMEDOUT;
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132
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133 return retval;
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134 }
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135
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136 int SDL_SemWait(SDL_sem *sem)
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137 {
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138 if ( ! sem ) {
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139 SDL_SetError("Passed a NULL semaphore");
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140 return -1;
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141 }
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142
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143 sem_wait(&sem->sem);
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144 return 0;
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145 }
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146
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147 Uint32 SDL_SemValue(SDL_sem *sem)
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148 {
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149 if ( ! sem ) {
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150 SDL_SetError("Passed a NULL semaphore");
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151 return -1;
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152 }
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153
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154 return sem_count(&sem->sem);
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155 }
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156
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157 int SDL_SemPost(SDL_sem *sem)
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158 {
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159 if ( ! sem ) {
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160 SDL_SetError("Passed a NULL semaphore");
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161 return -1;
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162 }
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163
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164 sem_signal(&sem->sem);
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165 return 0;
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166 }
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167
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168 #endif /* SDL_THREADS_DISABLED */