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[PATCH] SDL_GetVideoMode() does not find best mode, part 2 Following commit 1.51, I come accross a problem when SDL must choose between several video modes that could suit the one asked. If I ask 320x240 with this list: 768x480 768x240 640x400 640x200 384x480 384x240 320x400 320x200 The smallest selectables modes are 384x240 and 320x400. And SDL choose the later in this list, but 384x240 is more suitable. So I added a check to compare the pixel count (surface) of modes, and select the one which has the smallest pixel count. In my example, 384x240 has 92160 pixels, and 320x400 has 128000 pixels. So now SDL will choose 384x240 for the asked 320x240 mode.
author Patrice Mandin <patmandin@gmail.com>
date Thu, 19 Jan 2006 21:28:52 +0000
parents a8068adf156b
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1 ==============================================================================
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2 Using the Simple DirectMedia Layer on Atari
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3 ==============================================================================
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4
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5
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6 If you want to build SDL from sources to create SDL programs on Atari:
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7 see sections I - II.
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8
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9 If you want to create SDL programs on Atari using SDL binary build,
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10 download it from my web site (URL at end of this file).
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11
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12 If you want to configure a program using SDL on Atari,
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13 see sections IV - VI.
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14
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16 ==============================================================================
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17 I. Building the Simple DirectMedia Layer libraries:
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18 (This step isn't necessary if you have the SDL binary distribution)
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19
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20 Do the classic configure, with --disable-shared --enable-static and:
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21
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22 Tos version (should run everywhere):
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23 --disable-threads
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24 Tos does not support threads.
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25
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26 MiNT version (maybe Magic, only for multitasking OS):
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27 --disable-pthreads --enable-pth
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28 Mint and Magic may supports threads, so audio can be used with current
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29 devices, like Sun audio, or disk-writing support. Like Tos, interrupt
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30 audio without threads is more suited for Atari machines.
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31
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32 Then you can make ; make install it.
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33
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34 ==============================================================================
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35 II. Building the Simple DirectMedia Layer test programs:
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36
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37 Do the classic configure, then make.
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38
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39 Run them !
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40
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41 ==============================================================================
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42 III. Enjoy! :)
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43
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44 If you have a project you'd like me to know about, or want to ask questions,
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45 go ahead and join the SDL developer's mailing list by sending e-mail to:
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46
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47 sdl-request@libsdl.org
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48
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49 and put "subscribe" into the subject of the message. Or alternatively you
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50 can use the web interface:
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51
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52 http://www.libsdl.org/mailman/listinfo/sdl
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53
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54 ==============================================================================
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55 IV. What is supported:
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56
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57 Keyboard (GEMDOS, BIOS, GEM, Ikbd)
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58 Mouse (XBIOS, GEM, Ikbd)
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59 Video (XBIOS (Fullscreen), GEM (Windowed and Fullscreen))
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60 Timer (VBL vector, GNU pth library)
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61 Joysticks and joypads (Ikbd, Hardware)
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62 Audio (Hardware, XBIOS, GSXB, MCSN, STFA, /dev/audio if threads enabled)
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63 Threads (Multitasking OS only via GNU pth library)
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64 Shared object loader (using LDG library from http://ldg.atari.org/)
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65 Audio CD (MetaDOS)
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66 OpenGL (using Mesa offscreen rendering driver)
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67
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68 - Dependent driver combinations:
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69 Video Kbd Mouse Timer Joysticks
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70 xbios ikbd ikbd vbl(2) ikbd
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71 xbios gemdos xbios vbl(2) xbios(3)
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72 xbios bios xbios vbl(2) xbios(3)
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73 gem gem gem(1) vbl(2) xbios(3)
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74
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75 Audio O/S Misc
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76 dma8 All Uses MFP Timer A interrupt
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77 xbios TOS Uses MFP Timer A interrupt
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78 xbios MiNT Uses MiNT thread
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79 xbios Magic Disabled
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80 stfa All Uses MFP interrupt
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81 mcsn TOS Uses MFP Timer A interrupt
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82 mcsn MiNT Uses MiNT thread
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83 mcsn Magic Disabled
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84 gsxb All Uses GSXB callback
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85
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86 Joypad driver always uses hardware access.
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87 OpenGL driver always uses OSMesa.
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88
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89 (1) GEM does not report relative mouse motion, so xbios mouse driver is used
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90 to report this type event. Under MiNT, using XBIOS mouse driver is not possible.
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92 (2) If you build SDL with threads using the GNU pth library, timers are
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93 supported via the pth library.
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95 (3) Redirecting XBIOS vectors does not work under MiNT, so it is disabled in
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96 this case.
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98 ==============================================================================
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99 V. Environment variables:
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100
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101 SDL_VIDEODRIVER:
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102 Set to 'xbios' to force xbios video driver
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103 Set to 'gem' to force gem video driver
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104
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105 SDL_VIDEO_GL_DRIVER:
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106 Set to filename to load as OpenGL library, if you use SDL_GL_LoadLibrary()
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108 SDL_AUDIODRIVER:
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109 Set to 'mint_gsxb' to force Atari GSXB audio driver
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110 Set to 'mint_mcsn' to force Atari MCSN audio driver
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111 Set to 'mint_stfa' to force Atari STFA audio driver
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112 Set to 'mint_xbios' to force Atari Xbios audio driver
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113 Set to 'mint_dma8' to force Atari 8 bits DMA audio driver
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114 Set to 'audio' to force Sun /dev/audio audio driver
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115 Set to 'disk' to force disk-writing audio driver
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117 SDL_ATARI_EVENTSDRIVER
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118 Set to 'ikbd' to force IKBD 6301 keyboard driver
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119 Set to 'gemdos' to force gemdos keyboard driver
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120 Set to 'bios' to force bios keyboard driver
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121
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122 SDL_JOYSTICK_ATARI:
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123 Use any of these strings in the environment variable to enable or
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124 disable a joystick:
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125
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126 'ikbd-joy1-[on|off]' for IKBD joystick on port 1 (hardware access)
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127 'xbios-joy1-[on|off]' for IKBD joystick on port 1 (xbios access)
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128 'porta-pad-[on|off]' for joypad on port A
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129 'porta-joy0-[on|off]' for joystick 0 on port A
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130 'porta-joy1-[on|off]' for joystick 1 on port A
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131 'porta-lp-[on|off]' for lightpen on port A
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132 'porta-anpad-[on|off]' for analog paddle on port A
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133 'portb-pad-[on|off]' for joypad on port B
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134 'portb-joy0-[on|off]' for joystick 0 on port B
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135 'portb-joy1-[on|off]' for joystick 1 on port B
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136 'portb-anpad-[on|off]' for analog paddle on port B
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137
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138 Default configuration is:
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139 'ikbd-joy1-on' (if IKBD events driver enabled)
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140 'xbios-joy1-on' (if gemdos/bios/gem events driver enabled)
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141 'porta-pad-on portb-pad-on' (if available on the machine)
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142
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143 port[a|b]-[pad|joy?|lp|anpad]-* strings are mutually exclusives.
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144 On such a port, you can only use a joypad OR 1 or 2 joysticks OR
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145 a lightpen OR an analog paddle. You must disable joypad before
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146 setting another controller.
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147
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148 The second joystick port on IKBD is used by the mouse, so not usable.
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149 Another problem with the IKBD: mouse buttons and joystick fire buttons
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150 are wired together at the hardware level, it means:
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151 port 0 port 0 port 1
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152 mouse left button = joystick fire 0 = joystick fire 1
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153 mouse right button = joystick fire 1 = joystick fire 0
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154
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155 Descriptions of joysticks/joypads:
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156 - Joypads: 1 hat, 17 buttons (Atari Jaguar console-like).
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157 - Joysticks: 1 hat, 1 button.
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158 - Lightpen, analog paddles: 2 axis, 2 buttons. The 2 buttons are those
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159 affected to 1 button joysticks on the same port.
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160
319
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161 ==============================================================================
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162 VI. More informations about drivers:
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163
1007
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164 OpenGL:
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165 The default is to use the Mesa offscreen driver (osmesa.ldg). If you want
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166 to use an older OpenGL implementation, like mesa_gl.ldg or tiny_gl.ldg,
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167 your program must use SDL_GL_LoadLibrary() to do so, and retrieve the
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168 needed function pointers with SDL_LoadFunction(). In all cases, the OpenGL
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169 context is taken care of by SDL itself, you just have to use gl* functions.
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170
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171 However, there is one OpenGL call that has a different prototype in the old
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172 implementations: glOrtho(). In the old implementations, it has 6 float as
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173 parameters, in the standard one, it has 6 double parameters. If you want
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174 to compile testdyngl, or any other SDL program that loads its OpenGL
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175 library, you must change the glOrtho() prototype used in this program. In
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176 osmesa.ldg, you can retrieve a glOrtho() with double parameters, by
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177 searching for the function "glOrtho6d".
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178
319
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179 Xbios video:
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180 Video chip is detected using the _VDO cookie.
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181 Screen enhancers are not supported, but could be if you know how to
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182 use them.
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183
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184 ST, STE, Mega ST, Mega STE:
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185 320x200x4 bits, shades of grey, available only for the purpose
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186 of testing SDL.
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187 TT:
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188 320x480x8 and 320x240x8 (software double-lined mode).
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189 Falcon:
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190 All modes supported by the current monitor (RVB or VGA).
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191 BlowUp and Centscreen extended modes, ScreenBlaster 3 current mode.
319
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192 Clones and any machine with monochrome monitor:
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193 Not supported.
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194
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195 Gem video:
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196 Automatically used if xbios not available.
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197
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198 All machines:
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199 Only the current resolution, if 8 bits or higher depth.
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200
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201 IKBD keyboard, mouse and joystick driver:
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202 Available if _MCH cookie is ST, Mega ST, STE, Mega STE, TT or Falcon.
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203
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204 Hades has an IKBD, but xbios is not available for video, so IKBD
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205 driver is disabled.
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206
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207 Gemdos and bios keyboard driver:
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208 Available on all machines.
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209
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210 Mouse and joystick xbios driver:
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211 Available on all machines (I think).
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212
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213 Joypad driver:
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214 Available if _MCH cookie is STE or Falcon.
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215
557
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216 PTH timer driver:
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217 Available with multitasking OS.
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218
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219 VBL timer driver:
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220 Available on all machines (I think).
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221
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222 Audio drivers:
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223 Cookies _SND, MCSN, STFA and GSXB used to detect supported audio
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224 capabilities.
398
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225
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226 STE, Mega STE, TT:
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227 8 bits DMA (hardware access)
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228 STFA, MCSN or GSXB driver if installed
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229 Falcon:
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230 8 bits DMA (hardware access)
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231 Xbios functions
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232 STFA, MCSN or GSXB driver if installed
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233 Other machines:
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234 STFA, MCSN or GSXB driver if installed
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235
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236 STFA driver:
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237 http://removers.free.fr/softs/stfa.html
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238 GSXB driver:
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239 http://assemsoft.atari.org/gsxb/
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240 MacSound driver:
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241 http://jf.omnis.ch/software/tos/
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242 MagicSound driver (MCSN,GSXB compatible):
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243 http://perso.wanadoo.fr/didierm/
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244 X-Sound driver (GSXB compatible):
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245 http://www.uni-ulm.de/~s_thuth/atari/xsound_e.html
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246
281
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247 --
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248 Patrice Mandin <pmandin@caramail.com>
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249 http://membres.lycos.fr/pmandin/