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annotate src/thread/riscos/SDL_syssem.c @ 1555:780fd5b61df1

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Fixed bug #89 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 12:05:16 +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 /* RISC OS semiphores based on linux code */
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25
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26
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27 #include "SDL_timer.h"
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28 #include "SDL_thread.h"
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29 #include "SDL_systhread_c.h"
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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
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76 #include <unistd.h> /* For getpid() */
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77 #include <pthread.h>
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78 #include <semaphore.h>
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79
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80 struct SDL_semaphore {
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81 sem_t *sem;
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82 sem_t sem_data;
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83 };
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84
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85 /* Create a semaphore, initialized with value */
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86 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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87 {
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88 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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89 if ( sem ) {
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90 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) {
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91 SDL_SetError("sem_init() failed");
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92 SDL_free(sem);
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93 sem = NULL;
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94 } else {
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95 sem->sem = &sem->sem_data;
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96 }
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97 } else {
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98 SDL_OutOfMemory();
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99 }
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100 return sem;
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101 }
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102
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103 void SDL_DestroySemaphore(SDL_sem *sem)
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104 {
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105 if ( sem ) {
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106 sem_destroy(sem->sem);
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107 SDL_free(sem);
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108 }
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109 }
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110
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111 int SDL_SemTryWait(SDL_sem *sem)
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112 {
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113 int retval;
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114
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115 if ( ! sem ) {
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116 SDL_SetError("Passed a NULL semaphore");
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117 return -1;
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118 }
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119 retval = SDL_MUTEX_TIMEDOUT;
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120 if ( sem_trywait(sem->sem) == 0 ) {
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121 retval = 0;
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122 }
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123 return retval;
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124 }
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125
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126 int SDL_SemWait(SDL_sem *sem)
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127 {
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128 int retval;
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129
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130 if ( ! sem ) {
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131 SDL_SetError("Passed a NULL semaphore");
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132 return -1;
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133 }
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134
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135 retval = sem_wait(sem->sem);
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136 if ( retval < 0 ) {
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137 SDL_SetError("sem_wait() failed");
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138 }
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139 return retval;
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140 }
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141
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142 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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143 {
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144 int retval;
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145
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146 if ( ! sem ) {
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147 SDL_SetError("Passed a NULL semaphore");
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148 return -1;
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149 }
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150
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151 /* Try the easy cases first */
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152 if ( timeout == 0 ) {
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153 return SDL_SemTryWait(sem);
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154 }
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155 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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156 return SDL_SemWait(sem);
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157 }
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158
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159 /* Ack! We have to busy wait... */
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160 timeout += SDL_GetTicks();
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161 do {
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162 retval = SDL_SemTryWait(sem);
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163 if ( retval == 0 ) {
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164 break;
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165 }
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166 SDL_Delay(1);
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167 } while ( SDL_GetTicks() < timeout );
955
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168
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169 return retval;
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170 }
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171
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172 Uint32 SDL_SemValue(SDL_sem *sem)
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173 {
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174 int ret = 0;
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175 if ( sem ) {
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176 sem_getvalue(sem->sem, &ret);
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177 if ( ret < 0 ) {
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178 ret = 0;
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179 }
955
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180 }
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181 return (Uint32)ret;
955
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182 }
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183
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184 int SDL_SemPost(SDL_sem *sem)
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185 {
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186 int retval;
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187
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188 if ( ! sem ) {
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189 SDL_SetError("Passed a NULL semaphore");
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190 return -1;
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191 }
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192
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193 retval = sem_post(sem->sem);
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194 if ( retval < 0 ) {
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195 SDL_SetError("sem_post() failed");
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196 }
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197 return retval;
955
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198 }
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199
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
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200 #endif /* !SDL_THREADS_DISABLED */