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annotate src/video/ataricommon/SDL_xbiosevents.c @ 1240:3b8a43c428bb

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From Bug #36: There are a couple of issues with the selection of Altivec alpha-blitting routines in CalculateAlphaBlit() in src/video/SDL_Blit_A.c. 1) There's no check for the presence of Altivec when checking if the Blit32to565PixelAlphaAltivec() routine can be selected. 2) Altivec cannot be used in video memory, and there's no check if the destination surface is a hardware surface. (Alpha-blitting to a hardware surface with GPU support is a bad idea, but somebody's bound to do it anyway.) Patch to fix these attached.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 08 Jan 2006 21:18:15 +0000
parents a8068adf156b
children a201a8c62522
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@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /*
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29 * XBIOS mouse & joystick vectors
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30 *
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31 * Patrice Mandin
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32 */
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33
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34 #include <stdio.h>
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35 #include <stdlib.h>
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36 #include <string.h>
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37
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38 #include <mint/osbind.h>
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39
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40 #include "SDL_events_c.h"
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41 #include "SDL_xbiosevents_c.h"
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42 #include "SDL_xbiosinterrupt_s.h"
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43
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44 /* Variables */
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45
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46 int SDL_AtariXbios_enabled=0;
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47
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48 /* Local variables */
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49
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50 static _KBDVECS *kbdvecs; /* Pointer to access system vectors */
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51 static Uint16 atari_prevmouseb; /* buttons */
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52
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53 /* Functions */
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54
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55 void SDL_AtariXbios_InstallVectors(int vectors_mask)
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56 {
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57 void *oldpile;
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58
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59 /* Clear variables */
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60 SDL_AtariXbios_mouseb =
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61 SDL_AtariXbios_mousex =
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62 SDL_AtariXbios_mousey =
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63 SDL_AtariXbios_joystick =
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64 atari_prevmouseb = 0;
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65
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66 if (vectors_mask==0) {
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67 SDL_AtariXbios_enabled=0;
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68 return;
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69 }
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70
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71 /* Read IKBD vectors base */
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72 kbdvecs=Kbdvbase();
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73
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74 /* Go to supervisor mode */
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75 oldpile=(void *)Super(0);
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76
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77 /* Install our vectors */
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78 SDL_AtariXbios_Install(
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79 kbdvecs,
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80 (vectors_mask & ATARI_XBIOS_MOUSEEVENTS) ? SDL_AtariXbios_MouseVector : NULL,
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81 (vectors_mask & ATARI_XBIOS_JOYSTICKEVENTS) ? SDL_AtariXbios_JoystickVector : NULL
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82 );
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83
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84 /* Back to user mode */
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85 Super(oldpile);
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86
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87 SDL_AtariXbios_enabled=1;
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88 }
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89
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90 void SDL_AtariXbios_RestoreVectors(void)
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91 {
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92 void *oldpile;
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93
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94 if (SDL_AtariXbios_enabled==0) {
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95 return;
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96 }
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97
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98 /* Read IKBD vectors base */
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99 kbdvecs=Kbdvbase();
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100
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101 /* Go to supervisor mode */
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102 oldpile=(void *)Super(NULL);
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103
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104 /* Reinstall system vector */
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105 SDL_AtariXbios_Restore(kbdvecs);
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106
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107 /* Back to user mode */
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108 Super(oldpile);
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109 }
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110
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111 static int atari_GetButton(int button)
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112 {
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113 switch(button)
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114 {
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115 case 0:
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116 return SDL_BUTTON_RIGHT;
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117 break;
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118 case 1:
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119 default:
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120 return SDL_BUTTON_LEFT;
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121 break;
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122 }
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123 }
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124
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125 void SDL_AtariXbios_PostMouseEvents(_THIS)
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126 {
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127 if (SDL_AtariXbios_enabled==0) {
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128 return;
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129 }
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130
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131 /* Mouse motion ? */
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132 if (SDL_AtariXbios_mousex || SDL_AtariXbios_mousey) {
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133 SDL_PrivateMouseMotion(0, 1, SDL_AtariXbios_mousex, SDL_AtariXbios_mousey);
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134 SDL_AtariXbios_mousex = SDL_AtariXbios_mousey = 0;
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135 }
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136
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137 /* Mouse button ? */
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138 if (SDL_AtariXbios_mouseb != atari_prevmouseb) {
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139 int i;
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140
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141 for (i=0;i<2;i++) {
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142 int curbutton, prevbutton;
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143
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144 curbutton = SDL_AtariXbios_mouseb & (1<<i);
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145 prevbutton = atari_prevmouseb & (1<<i);
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146
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147 if (curbutton && !prevbutton) {
305
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148 SDL_PrivateMouseButton(SDL_PRESSED, atari_GetButton(i), 0, 0);
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149 }
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150 if (!curbutton && prevbutton) {
305
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151 SDL_PrivateMouseButton(SDL_RELEASED, atari_GetButton(i), 0, 0);
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152 }
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153 }
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154 atari_prevmouseb = SDL_AtariXbios_mouseb;
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155 }
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156 }