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annotate src/video/riscos/SDL_riscostask.c @ 1076:8d3b95ece376

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[PATCH] SDL_GetVideoMode() do not find the best video mode The current GetVideoMode() function stops at the first mode which has any dimensions smaller than the one asked, and gives the previous in the list. If I ask 336x224 with this list: 768x480 768x240 640x400 640x200 384x480 384x240 320x400 320x200 SDL will give me 640x400, because 640x200 as height smaller than what I asked. However the best mode is the smaller which has both dimensions bigger than the one asked (384x240 in my example). This patch fixes this, plus it does not rely on a sorted video mode list.
author Patrice Mandin <patmandin@gmail.com>
date Sun, 12 Jun 2005 16:12:55 +0000
parents de22ea8440d2
children c9b51268668f
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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@devolution.com
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21 */
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22
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23 /*
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24 This file added by Alan Buckley (alan_baa@hotmail.com) to support RISC OS
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25 26 March 2003
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26
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27 File includes routines for:
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28 Setting up as a WIMP Task
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29 Reading information about the current desktop
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30 Storing information before a switch to full screen
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31 Restoring desktop after switching to full screen
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32 */
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33
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34 #include <stdlib.h>
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35 #include <string.h>
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36
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37 #include "kernel.h"
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38 #include "swis.h"
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39
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40 #include "SDL_riscostask.h"
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41
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42 #ifndef DISABLE_THREADS
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43 #include <pthread.h>
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44 pthread_t main_thread;
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45 #endif
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46
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47 /* RISC OS variables */
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48
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49 static int task_handle = 0;
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50 static int wimp_version = 0;
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51
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52 /* RISC OS variables to help compatability with certain programs */
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53 int riscos_backbuffer = 0; /* Create a back buffer in system memory for full screen mode */
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54 int riscos_closeaction = 1; /* Close icon action */
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55
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56 static int stored_mode = -1; /* -1 when in desktop, mode number or pointer when full screen */
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57
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58 extern int mouseInWindow; /* Mouse is in WIMP window */
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59
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60 /* Local function */
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61
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62 static int RISCOS_GetTaskName(char *task_name);
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63
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64 /* Uncomment next line to copy mode changes/restores to stderr */
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65 /* #define DUMP_MODE */
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66 #ifdef DUMP_MODE
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67 #include "stdio.h"
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68 static void 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 {
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73 int blockSize = 0;
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74 int *storeBlock = (int *)stored_mode;
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75
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76 while(blockSize < 5 || storeBlock[blockSize] != -1)
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77 {
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78 fprintf(stderr, " %d\n", storeBlock[blockSize++]);
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79 }
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80 }
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81 }
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82 #endif
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83
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84 /******************************************************************
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85
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86 Initialise as RISC OS Wimp task
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87
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88 *******************************************************************/
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89
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90 int RISCOS_InitTask()
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91 {
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92 char task_name[32];
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93 _kernel_swi_regs regs;
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94 int messages[4];
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95
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96 if (RISCOS_GetTaskName(task_name) == 0) 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 {
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110 wimp_version = regs.r[0];
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111 task_handle = regs.r[1];
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112 return 1;
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113 }
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114
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115 #ifndef DISABLE_THREADS
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116 main_thread = pthread_self();
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117 #endif
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118
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119 return 0;
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120 }
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121
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122 /*********************************************************************
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123
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124 Close down application on exit.
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125
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126 **********************************************************************/
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127
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128 void RISCOS_ExitTask()
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129 {
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130 _kernel_swi_regs regs;
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131
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132 if (stored_mode == -1)
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133 {
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134 /* Ensure cursor is put back to standard pointer shape if
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135 we have been running in a window */
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136 _kernel_osbyte(106,1,0);
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137 }
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138
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139 /* Ensure we end up back in the wimp */
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140 RISCOS_RestoreWimpMode();
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141
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142 /* Neatly exit the task */
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143 regs.r[0] = task_handle;
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144 regs.r[1] = (unsigned int)0x4b534154;
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145 _kernel_swi(Wimp_CloseDown, &regs, &regs);
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146 task_handle = 0;
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147 }
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148
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149 /**************************************************************************
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150
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151 Get the name of the task for the desktop.
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152
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153 Param: task_name - name of task 32 characters.
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154
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155 Returns: 1 is successful, otherwise 0
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156
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157 Notes: Works by getting using OS_GetEnv to get the command line
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158 used to run the program and then parsing a name from it
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159 as follows.
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160
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161 1. Use name after final period if not !RunImage
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162 2. If name is !RunImage then process item before the period
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163 in front of !RunImage.
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164 3. If directory name use that
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165 4. if in form <XXX$Dir> use the XXX.
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166
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167 Finally once this value has been retrieved use it unless
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168 there is a variable set up in the form SDL$<name>$TaskName
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169 in which case the value of this variable will be used.
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170
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171 Now also gets other RISC OS configuration varibles
630
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172 SDL$<name>$BackBuffer - set to 1 to use a system memory backbuffer in fullscreen mode
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173 so updates wait until a call to SDL_UpdateRects. (default 0)
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174 This is required for programmes where they have assumed this is
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175 always the case which is contrary to the documentation.
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176 SDL$<name>$CloseAction
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177 0 Don't show close icon
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178 1 Show close icon
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179
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180 ***************************************************************************/
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181
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182 int RISCOS_GetTaskName(char *task_name)
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183 {
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184 _kernel_swi_regs regs;
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185
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186 task_name[0] = 0;
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187
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188 /* Figure out a sensible task name */
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189 if (_kernel_swi(OS_GetEnv, &regs, &regs) == 0)
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190 {
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191 char *command_line = (char *)regs.r[0];
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192 char *buffer = malloc(strlen(command_line)+1);
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193 char *env_var;
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194 char *p;
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195
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196 strcpy(buffer, command_line);
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197 p = strchr(buffer, ' ');
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198 if (p) *p = 0;
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199 p = strrchr(buffer, '.');
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200 if (p == 0) p = buffer;
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201 if (stricmp(p+1,"!RunImage") == 0)
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202 {
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203 *p = 0;
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204 p = strrchr(buffer, '.');
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205 if (p == 0) p = buffer;
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206 }
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207 if (*p == '.') p++;
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208 if (*p == '!') p++; /* Skip "!" at beginning of application directories */
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209
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210 if (*p == '<')
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211 {
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212 // Probably in the form <appname$Dir>
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213 char *q = strchr(p, '$');
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214 if (q == 0) q = strchr(p,'>'); /* Use variable name if not */
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215 if (q) *q = 0;
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216 p++; /* Move over the < */
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217 }
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218
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219 if (*p)
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220 {
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221 /* Read variables that effect the RISC OS SDL engine for this task */
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222 env_var = malloc(strlen(p) + 18); /* 18 is larger than the biggest variable name */
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223 if (env_var)
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224 {
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225 char *env_val;
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226
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227 /* See if a variable of form SDL$<dirname>$TaskName exists */
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228
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229 strcpy(env_var, "SDL$");
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230 strcat(env_var, p);
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231 strcat(env_var, "$TaskName");
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232
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233 env_val = getenv(env_var);
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234 if (env_val) strncpy(task_name, env_val, 31);
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235
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236 strcpy(env_var, "SDL$");
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237 strcat(env_var, p);
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238 strcat(env_var, "$BackBuffer");
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239
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240 env_val = getenv(env_var);
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241 if (env_val) riscos_backbuffer = atoi(env_val);
630
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242
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243 strcpy(env_var, "SDL$");
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244 strcat(env_var, p);
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245 strcat(env_var, "$CloseAction");
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246
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247 env_val = getenv(env_var);
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248 if (env_val && strcmp(env_val,"0") == 0) riscos_closeaction = 0;
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249
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250 free(env_var);
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251 }
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252
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253 if (task_name[0] == 0) strncpy(task_name, p, 31);
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254 task_name[31] = 0;
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255 }
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256
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257 free(buffer);
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258 }
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259
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260 if (task_name[0] == 0) strcpy(task_name, "SDL Task");
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261
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262 return 1;
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263 }
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264
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265 /*****************************************************************
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266
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267 Store the current desktop screen mode if we are in the desktop.
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268
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269 ******************************************************************/
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270
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271 void RISCOS_StoreWimpMode()
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272 {
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273 _kernel_swi_regs regs;
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274
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275 /* Don't store if in full screen mode */
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276 if (stored_mode != -1) return;
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277
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278 regs.r[0] = 1;
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279 _kernel_swi(OS_ScreenMode, &regs, &regs);
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280 if (regs.r[1] >= 0 && regs.r[1] < 256) stored_mode = regs.r[1];
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281 else
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282 {
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283 int blockSize = 0;
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284 int *retBlock = (int *)regs.r[1];
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285 int *storeBlock;
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286 int j;
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287
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288 while(blockSize < 5 || retBlock[blockSize] != -1) blockSize++;
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289 blockSize++;
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290 storeBlock = (int *)malloc(blockSize * sizeof(int));
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291 retBlock = (int *)regs.r[1];
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292 for ( j = 0; j < blockSize; j++)
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293 storeBlock[j] = retBlock[j];
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294
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295 stored_mode = (int)storeBlock;
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296 }
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297 #if DUMP_MODE
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298 fprintf(stderr, "Stored "); dump_mode();
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299 #endif
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300 }
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301
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302 /*****************************************************************
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303
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304 Restore desktop screen mode if we are in full screen mode.
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305
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306 *****************************************************************/
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307
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308 void RISCOS_RestoreWimpMode()
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309 {
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310 _kernel_swi_regs regs;
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311
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312 /* Only need to restore if we are in full screen mode */
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313 if (stored_mode == -1) return;
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314
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315 #if DUMP_MODE
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316 fprintf(stderr, "Restored"); dump_mode();
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317 #endif
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318
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319 regs.r[0] = stored_mode;
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320 _kernel_swi(Wimp_SetMode, &regs, &regs);
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321 if (stored_mode < 0 || stored_mode > 256)
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322 {
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323 free((int *)stored_mode);
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324 }
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325 stored_mode = -1;
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326
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327 /* Flush keyboard buffer to dump the keystrokes we've already polled */
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328 regs.r[0] = 21;
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329 regs.r[1] = 0; /* Keyboard buffer number */
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330 _kernel_swi(OS_Byte, &regs, &regs);
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331
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332 mouseInWindow = 0;
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333
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334 }
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335
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336 /*********************************************************************
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337
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338 Get version of Wimp running when task was initialised.
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339
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340 *********************************************************************/
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341
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342 int RISCOS_GetWimpVersion()
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343 {
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344 return wimp_version;
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345 }
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346
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347 int RISCOS_GetTaskHandle()
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348 {
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349 return task_handle;
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350 }