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annotate src/video/riscos/SDL_riscostask.c @ 889:eac8c69b5706

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ate: Fri, 09 Apr 2004 20:07:10 +0200 From: Hibernatus Subject: [SDL] BUG: changing video mode in opengl + windows In WIN_GL_SetupWindow (SDL12/src/video/wincommon/SDL_wingl.c) you call WIN_GL_ResetWindow when SetPixelFormat fails. WIN_GL_ResetWindow cannot properly work in its current state, because there are several things to update once you've created a new window. At least DirectInput doesn't work anymore here (which is somewhat annoying for the player :). I think you can simply remove that function. Many games don't try to recover from that exception, that's why the newest ATI drivers emulate 16 bpp display in 32 bpp mode so the error never occurs (but the games may run much slower). Having SDL_SetVideoMode return NULL would be better than actually setting the video mode and losing focus, directinput and maybe directsound too. It also made my previous drivers crash (when switching from 32 bpp windowed to 16 bpp fullscreen).
author Sam Lantinga <slouken@libsdl.org>
date Sun, 16 May 2004 18:02:48 +0000
parents b8d311d90021
children d74fbf56f2f6
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 RISCOS
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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 /* RISCOS variables */
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43
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44 static int task_handle = 0;
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45 static int wimp_version = 0;
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46
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47 /* RISC OS variables to help compatability with certain programs */
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48 int riscos_backbuffer = 0; /* Create a back buffer in system memory for full screen mode */
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49 int riscos_closeaction = 1; /* Close icon action */
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50 int riscos_audiobuffer = 0; /* Audio buffer size */
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51
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52 static int stored_mode = -1; /* -1 when in desktop, mode number or pointer when full screen */
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53
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54 extern int mouseInWindow; /* Mouse is in WIMP window */
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55
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56 /* Local function */
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57
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58 static int RISCOS_GetTaskName(char *task_name);
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59
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60 /* Uncomment next line to copy mode changes/restores to stderr */
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61 /* #define DUMP_MODE */
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62 #ifdef DUMP_MODE
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63 #include "stdio.h"
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64 static void dump_mode()
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65 {
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66 fprintf(stderr, "mode %d\n", stored_mode);
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67 if (stored_mode < -1 || stored_mode >= 256)
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68 {
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69 int blockSize = 0;
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70 int *storeBlock = (int *)stored_mode;
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71
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72 while(blockSize < 5 || storeBlock[blockSize] != -1)
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73 {
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74 fprintf(stderr, " %d\n", storeBlock[blockSize++]);
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75 }
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76 }
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77 }
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78 #endif
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79
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80 /******************************************************************
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81
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82 Initialise as RISCOS Wimp task
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83
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84 *******************************************************************/
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85
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86 int RISCOS_InitTask()
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87 {
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88 char task_name[32];
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89 _kernel_swi_regs regs;
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90 int messages[4];
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91
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92 if (RISCOS_GetTaskName(task_name) == 0) return 0;
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93
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94 messages[0] = 9; /* Palette changed */
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95 messages[1] = 0x400c1; /* Mode changed */
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96 messages[2] = 8; /* Pre quit */
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97 messages[2] = 0;
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98
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99 regs.r[0] = (unsigned int)360; /* Minimum version 3.6 */
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100 regs.r[1] = (unsigned int)0x4b534154;
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101 regs.r[2] = (unsigned int)task_name;
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102 regs.r[3] = (unsigned int)messages;
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103
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104 if (_kernel_swi(Wimp_Initialise, &regs, &regs) == 0)
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105 {
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106 wimp_version = regs.r[0];
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107 task_handle = regs.r[1];
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108 return 1;
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109 }
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110
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111 return 0;
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112 }
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113
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114 /*********************************************************************
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115
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116 Close down application on exit.
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117
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118 **********************************************************************/
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119
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120 void RISCOS_ExitTask()
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121 {
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122 _kernel_swi_regs regs;
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123
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124 if (stored_mode == -1)
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125 {
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126 /* Ensure cursor is put back to standard pointer shape if
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127 we have been running in a window */
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128 _kernel_osbyte(106,1,0);
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129 }
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130
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131 /* Ensure we end up back in the wimp */
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132 RISCOS_RestoreWimpMode();
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133
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134 /* Neatly exit the task */
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135 regs.r[0] = task_handle;
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136 regs.r[1] = (unsigned int)0x4b534154;
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137 _kernel_swi(Wimp_CloseDown, &regs, &regs);
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138 task_handle = 0;
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139 }
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140
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141 /**************************************************************************
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142
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143 Get the name of the task for the desktop.
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144
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145 Param: task_name - name of task 32 characters.
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146
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147 Returns: 1 is successful, otherwise 0
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148
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149 Notes: Works by getting using OS_GetEnv to get the command line
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150 used to run the program and then parsing a name from it
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151 as follows.
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152
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153 1. Use name after final period if not !RunImage
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154 2. If name is !RunImage then process item before the period
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Sam Lantinga <slouken@libsdl.org>
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155 in front of !RunImage.
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156 3. If directory name use that
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157 4. if in form <XXX$Dir> use the XXX.
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158
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159 Finally once this value has been retrieved use it unless
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160 there is a variable set up in the form SDL$<name>$TaskName
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161 in which case the value of this variable will be used.
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162
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163 Now also gets other riscos configuration varibles
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164 SDL$<name>$BackBuffer - set to 1 to use a system memory backbuffer in fullscreen mode
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165 so updates wait until a call to SDL_UpdateRects. (default 0)
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166 This is required for programmes where they have assumed this is
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167 always the case which is contrary to the documentation.
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168 SDL$<name>$CloseAction
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169 0 Don't show close icon
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Sam Lantinga <slouken@libsdl.org>
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170 1 Show close icon
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171
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172 SDL$<name>$AudioBuffer - set to number of samples to buffer
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173 in advance. Will default to a minimum of 1024 or twice
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Sam Lantinga <slouken@libsdl.org>
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174 amount requested by program whichever is largest.
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175 If not specified default is amount for 10 csecs.
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176 Time that will be pre-buffered can be calculated as
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177 sample to buffer * 1000 / freq milliseconds.
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178
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179 ***************************************************************************/
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180
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181 int RISCOS_GetTaskName(char *task_name)
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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 {
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190 char *command_line = (char *)regs.r[0];
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191 char *buffer = malloc(strlen(command_line)+1);
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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 strcpy(buffer, command_line);
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196 p = strchr(buffer, ' ');
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197 if (p) *p = 0;
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198 p = strrchr(buffer, '.');
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199 if (p == 0) p = buffer;
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200 if (stricmp(p+1,"!RunImage") == 0)
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201 {
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202 *p = 0;
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203 p = strrchr(buffer, '.');
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204 if (p == 0) p = buffer;
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205 }
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206 if (*p == '.') p++;
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207 if (*p == '!') p++; /* Skip "!" at beginning of application directories */
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208
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209 if (*p == '<')
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210 {
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211 // Probably in the form <appname$Dir>
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212 char *q = strchr(p, '$');
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213 if (q == 0) q = strchr(p,'>'); /* Use variable name if not */
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214 if (q) *q = 0;
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215 p++; /* Move over the < */
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216 }
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217
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218 if (*p)
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219 {
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220 /* Read variables that effect the RISCOS SDL engine for this task */
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221 env_var = malloc(strlen(p) + 18); /* 18 is larger than the biggest variable name */
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222 if (env_var)
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223 {
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224 char *env_val;
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225
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226 /* See if a variable of form SDL$<dirname>$TaskName exists */
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227
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228 strcpy(env_var, "SDL$");
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229 strcat(env_var, p);
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230 strcat(env_var, "$TaskName");
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231
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232 env_val = getenv(env_var);
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233 if (env_val) strncpy(task_name, env_val, 31);
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234
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235 strcpy(env_var, "SDL$");
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236 strcat(env_var, p);
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237 strcat(env_var, "$BackBuffer");
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238
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239 env_val = getenv(env_var);
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240 if (env_val && strcmp(env_val,"1") == 0) riscos_backbuffer = 1;
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241
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242 strcpy(env_var, "SDL$");
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243 strcat(env_var, p);
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244 strcat(env_var, "$CloseAction");
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245
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246 env_val = getenv(env_var);
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247 if (env_val && strcmp(env_val,"0") == 0) riscos_closeaction = 0;
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248
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249 strcpy(env_var, "SDL$");
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250 strcat(env_var, p);
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251 strcat(env_var, "$AudioBuffer");
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252
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253 env_val = getenv(env_var);
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254 riscos_audiobuffer = atoi(env_val);
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255
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Sam Lantinga <slouken@libsdl.org>
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256 free(env_var);
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257 }
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258
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259 if (task_name[0] == 0) strncpy(task_name, p, 31);
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260 task_name[31] = 0;
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261 }
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262
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263 free(buffer);
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264 }
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265
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Sam Lantinga <slouken@libsdl.org>
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266 if (task_name[0] == 0) strcpy(task_name, "SDL Task");
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267
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268 return 1;
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269 }
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270
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271 /*****************************************************************
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272
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273 Store the current desktop screen mode if we are in the desktop.
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274
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275 ******************************************************************/
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276
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Sam Lantinga <slouken@libsdl.org>
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277 void RISCOS_StoreWimpMode()
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278 {
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279 _kernel_swi_regs regs;
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280
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281 /* Don't store if in full screen mode */
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Sam Lantinga <slouken@libsdl.org>
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282 if (stored_mode != -1) return;
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283
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284 regs.r[0] = 1;
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285 _kernel_swi(OS_ScreenMode, &regs, &regs);
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286 if (regs.r[1] >= 0 && regs.r[1] < 256) stored_mode = regs.r[1];
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287 else
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288 {
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289 int blockSize = 0;
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290 int *retBlock = (int *)regs.r[1];
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291 int *storeBlock;
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292 int j;
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293
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294 while(blockSize < 5 || retBlock[blockSize] != -1) blockSize++;
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295 blockSize++;
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296 storeBlock = (int *)malloc(blockSize * sizeof(int));
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297 retBlock = (int *)regs.r[1];
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298 for ( j = 0; j < blockSize; j++)
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299 storeBlock[j] = retBlock[j];
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300
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301 stored_mode = (int)storeBlock;
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302 }
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303 #if DUMP_MODE
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304 fprintf(stderr, "Stored "); dump_mode();
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305 #endif
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306 }
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307
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308 /*****************************************************************
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309
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310 Restore desktop screen mode if we are in full screen mode.
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311
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312 *****************************************************************/
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313
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314 void RISCOS_RestoreWimpMode()
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315 {
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316 _kernel_swi_regs regs;
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317
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318 /* Only need to restore if we are in full screen mode */
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319 if (stored_mode == -1) return;
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320
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321 #if DUMP_MODE
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322 fprintf(stderr, "Restored"); dump_mode();
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323 #endif
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324
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325 regs.r[0] = stored_mode;
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326 _kernel_swi(Wimp_SetMode, &regs, &regs);
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327 if (stored_mode < 0 || stored_mode > 256)
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328 {
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329 free((int *)stored_mode);
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330 }
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331 stored_mode = -1;
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332
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333 /* Flush keyboard buffer to dump the keystrokes we've already polled */
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334 regs.r[0] = 21;
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335 regs.r[1] = 0; /* Keyboard buffer number */
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336 _kernel_swi(OS_Byte, &regs, &regs);
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337
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338 mouseInWindow = 0;
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339
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340 }
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341
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342 /*********************************************************************
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343
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344 Get version of Wimp running when task was initialised.
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345
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346 *********************************************************************/
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347
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348 int RISCOS_GetWimpVersion()
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349 {
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350 return wimp_version;
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351 }
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352
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353 int RISCOS_GetTaskHandle()
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354 {
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355 return task_handle;
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356 }