annotate src/video/riscos/SDL_riscostask.c @ 3473:7bdc10624cba

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 f7b03b6838cb
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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 /*
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25 This file added by Alan Buckley (alan_baa@hotmail.com) to support RISC OS
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26 26 March 2003
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27
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28 File includes routines for:
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29 Setting up as a WIMP Task
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30 Reading information about the current desktop
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31 Storing information before a switch to full screen
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32 Restoring desktop after switching to full screen
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33 */
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34
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35 #include "kernel.h"
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36 #include "swis.h"
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37
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38 #include "SDL_stdinc.h"
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39 #include "SDL_riscostask.h"
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40
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41 #if !SDL_THREADS_DISABLED
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42 #include <pthread.h>
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43 pthread_t main_thread;
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44 #endif
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45
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46 /* RISC OS variables */
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47
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48 static int task_handle = 0;
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49 static int wimp_version = 0;
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50
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51 /* RISC OS variables to help compatability with certain programs */
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52 int riscos_backbuffer = 0; /* Create a back buffer in system memory for full screen mode */
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53 int riscos_closeaction = 1; /* Close icon action */
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54
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55 static int stored_mode = -1; /* -1 when in desktop, mode number or pointer when full screen */
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56
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57 extern int mouseInWindow; /* Mouse is in WIMP window */
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58
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59 /* Local function */
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60
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61 static int RISCOS_GetTaskName(char *task_name, size_t maxlen);
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62
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63 /* Uncomment next line to copy mode changes/restores to stderr */
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64 /* #define DUMP_MODE */
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65 #ifdef DUMP_MODE
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66 #include "stdio.h"
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67 static void
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68 dump_mode()
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69 {
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70 fprintf(stderr, "mode %d\n", stored_mode);
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71 if (stored_mode < -1 || stored_mode >= 256) {
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72 int blockSize = 0;
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73 int *storeBlock = (int *) stored_mode;
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74
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75 while (blockSize < 5 || storeBlock[blockSize] != -1) {
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76 fprintf(stderr, " %d\n", storeBlock[blockSize++]);
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77 }
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78 }
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79 }
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80 #endif
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81
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82 /******************************************************************
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83
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84 Initialise as RISC OS Wimp task
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85
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86 *******************************************************************/
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87
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88 int
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89 RISCOS_InitTask()
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90 {
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91 char task_name[32];
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92 _kernel_swi_regs regs;
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93 int messages[4];
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94
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95 if (RISCOS_GetTaskName(task_name, SDL_arraysize(task_name)) == 0)
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96 return 0;
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97
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98 messages[0] = 9; /* Palette changed */
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99 messages[1] = 0x400c1; /* Mode changed */
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100 messages[2] = 8; /* Pre quit */
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101 messages[2] = 0;
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102
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103 regs.r[0] = (unsigned int) 360; /* Minimum version 3.6 */
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104 regs.r[1] = (unsigned int) 0x4b534154;
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105 regs.r[2] = (unsigned int) task_name;
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106 regs.r[3] = (unsigned int) messages;
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107
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108 if (_kernel_swi(Wimp_Initialise, &regs, &regs) == 0) {
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109 wimp_version = regs.r[0];
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110 task_handle = regs.r[1];
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111 return 1;
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112 }
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113 #if !SDL_THREADS_DISABLED
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114 main_thread = pthread_self();
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115 #endif
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116
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117 return 0;
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118 }
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119
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120 /*********************************************************************
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121
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122 Close down application on exit.
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123
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124 **********************************************************************/
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125
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126 void
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127 RISCOS_ExitTask()
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128 {
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129 _kernel_swi_regs regs;
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130
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131 if (stored_mode == -1) {
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132 /* Ensure cursor is put back to standard pointer shape if
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133 we have been running in a window */
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134 _kernel_osbyte(106, 1, 0);
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135 }
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136
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137 /* Ensure we end up back in the wimp */
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138 RISCOS_RestoreWimpMode();
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139
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140 /* Neatly exit the task */
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141 regs.r[0] = task_handle;
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142 regs.r[1] = (unsigned int) 0x4b534154;
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143 _kernel_swi(Wimp_CloseDown, &regs, &regs);
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144 task_handle = 0;
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145 }
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146
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147 /**************************************************************************
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148
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149 Get the name of the task for the desktop.
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150
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151 Param: task_name - name of task 32 characters.
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152
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153 Returns: 1 is successful, otherwise 0
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154
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155 Notes: Works by getting using OS_GetEnv to get the command line
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156 used to run the program and then parsing a name from it
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157 as follows.
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158
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159 1. Use name after final period if not !RunImage
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160 2. If name is !RunImage then process item before the period
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161 in front of !RunImage.
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162 3. If directory name use that
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163 4. if in form <XXX$Dir> use the XXX.
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164
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165 Finally once this value has been retrieved use it unless
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166 there is a variable set up in the form SDL$<name>$TaskName
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167 in which case the value of this variable will be used.
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168
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169 Now also gets other RISC OS configuration varibles
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170 SDL$<name>$BackBuffer - set to 1 to use a system memory backbuffer in fullscreen mode
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171 so updates wait until a call to SDL_UpdateRects. (default 0)
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172 This is required for programmes where they have assumed this is
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173 always the case which is contrary to the documentation.
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174 SDL$<name>$CloseAction
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175 0 Don't show close icon
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176 1 Show close icon
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177
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178 ***************************************************************************/
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179
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180 int
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181 RISCOS_GetTaskName(char *task_name, size_t maxlen)
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182 {
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183 _kernel_swi_regs regs;
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184
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185 task_name[0] = 0;
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186
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187 /* Figure out a sensible task name */
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188 if (_kernel_swi(OS_GetEnv, &regs, &regs) == 0) {
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189 char *command_line = (char *) regs.r[0];
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190 size_t len = SDL_strlen(command_line) + 1;
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191 char *buffer = SDL_stack_alloc(char, len);
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192 char *env_var;
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193 char *p;
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194
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195 SDL_strlcpy(buffer, command_line, len);
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196 p = SDL_strchr(buffer, ' ');
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197 if (p)
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198 *p = 0;
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199 p = SDL_strrchr(buffer, '.');
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200 if (p == 0)
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201 p = buffer;
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202 if (stricmp(p + 1, "!RunImage") == 0) {
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203 *p = 0;
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204 p = SDL_strrchr(buffer, '.');
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205 if (p == 0)
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206 p = buffer;
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207 }
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208 if (*p == '.')
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209 p++;
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210 if (*p == '!')
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211 p++; /* Skip "!" at beginning of application directories */
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212
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213 if (*p == '<') {
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214 // Probably in the form <appname$Dir>
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215 char *q = SDL_strchr(p, '$');
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216 if (q == 0)
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217 q = SDL_strchr(p, '>'); /* Use variable name if not */
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218 if (q)
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219 *q = 0;
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220 p++; /* Move over the < */
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221 }
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222
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223 if (*p) {
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224 /* Read variables that effect the RISC OS SDL engine for this task */
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225 len = SDL_strlen(p) + 18; /* 18 is larger than the biggest variable name */
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226 env_var = SDL_stack_alloc(char, len);
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227 if (env_var) {
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228 char *env_val;
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229
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230 /* See if a variable of form SDL$<dirname>$TaskName exists */
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231
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232 SDL_strlcpy(env_var, "SDL$", len);
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233 SDL_strlcat(env_var, p, len);
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234 SDL_strlcat(env_var, "$TaskName", len);
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235
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236 env_val = SDL_getenv(env_var);
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237 if (env_val)
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238 SDL_strlcpy(task_name, env_val, maxlen);
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239
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240 SDL_strlcpy(env_var, "SDL$", len);
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241 SDL_strlcat(env_var, p, len);
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242 SDL_strlcat(env_var, "$BackBuffer", len);
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243
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244 env_val = SDL_getenv(env_var);
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245 if (env_val)
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246 riscos_backbuffer = atoi(env_val);
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247
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248 SDL_strlcpy(env_var, "SDL$", len);
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249 SDL_strlcat(env_var, p, len);
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250 SDL_strlcat(env_var, "$CloseAction", len);
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251
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252 env_val = SDL_getenv(env_var);
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253 if (env_val && SDL_strcmp(env_val, "0") == 0)
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254 riscos_closeaction = 0;
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255
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256 SDL_stack_free(env_var);
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257 }
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258
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259 if (!*task_name)
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260 SDL_strlcpy(task_name, p, maxlen);
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261 }
630
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262
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263 SDL_stack_free(buffer);
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264 }
630
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265
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266 if (task_name[0] == 0)
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267 SDL_strlcpy(task_name, "SDL Task", maxlen);
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268
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269 return 1;
630
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270 }
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271
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272 /*****************************************************************
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273
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274 Store the current desktop screen mode if we are in the desktop.
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275
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276 ******************************************************************/
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277
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278 void
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279 RISCOS_StoreWimpMode()
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280 {
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281 _kernel_swi_regs regs;
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282
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283 /* Don't store if in full screen mode */
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284 if (stored_mode != -1)
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285 return;
630
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286
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287 regs.r[0] = 1;
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288 _kernel_swi(OS_ScreenMode, &regs, &regs);
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289 if (regs.r[1] >= 0 && regs.r[1] < 256)
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290 stored_mode = regs.r[1];
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291 else {
630
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292 int blockSize = 0;
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293 int *retBlock = (int *) regs.r[1];
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294 int *storeBlock;
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295 int j;
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296
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297 while (blockSize < 5 || retBlock[blockSize] != -1)
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298 blockSize++;
630
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299 blockSize++;
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300 storeBlock = (int *) SDL_malloc(blockSize * sizeof(int));
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301 retBlock = (int *) regs.r[1];
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302 for (j = 0; j < blockSize; j++)
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303 storeBlock[j] = retBlock[j];
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304
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305 stored_mode = (int) storeBlock;
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306 }
630
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307 #if DUMP_MODE
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308 fprintf(stderr, "Stored ");
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309 dump_mode();
630
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310 #endif
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311 }
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312
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313 /*****************************************************************
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314
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315 Restore desktop screen mode if we are in full screen mode.
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316
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317 *****************************************************************/
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318
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319 void
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320 RISCOS_RestoreWimpMode()
630
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321 {
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322 _kernel_swi_regs regs;
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323
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324 /* Only need to restore if we are in full screen mode */
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325 if (stored_mode == -1)
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326 return;
630
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327
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328 #if DUMP_MODE
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329 fprintf(stderr, "Restored");
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330 dump_mode();
630
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331 #endif
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332
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333 regs.r[0] = stored_mode;
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334 _kernel_swi(Wimp_SetMode, &regs, &regs);
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335 if (stored_mode < 0 || stored_mode > 256) {
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336 SDL_free((int *) stored_mode);
630
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337 }
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338 stored_mode = -1;
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339
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340 /* Flush keyboard buffer to dump the keystrokes we've already polled */
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341 regs.r[0] = 21;
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342 regs.r[1] = 0; /* Keyboard buffer number */
630
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343 _kernel_swi(OS_Byte, &regs, &regs);
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344
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345 mouseInWindow = 0;
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346
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347 }
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348
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349 /*********************************************************************
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350
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351 Get version of Wimp running when task was initialised.
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352
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353 *********************************************************************/
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354
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355 int
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356 RISCOS_GetWimpVersion()
630
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357 {
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358 return wimp_version;
630
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359 }
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360
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361 int
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362 RISCOS_GetTaskHandle()
630
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363 {
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364 return task_handle;
630
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365 }
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366
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367 /* vi: set ts=4 sw=4 expandtab: */