Mercurial > sdl-ios-xcode
annotate docs/html/sdlglsetattribute.html @ 821:30168104389f
Date: Sat, 14 Feb 2004 14:52:40 +0200
From: "Mike Gorchak"
Subject: Batch of the QNX6 fixes for the SDL
1. Updated readme.QNX
2. Fixed crashes during intensive window updating under fast machines (got over 200 rectangles for update).
3. Fixed double-buffered fullscreen modes, now it works as needed.
4. Fixed Photon detection algorithm.
5. Fixed HWSURFACE update function.
6. Added SDL_PHOTON_FULLSCREEN_REFRESH environment variable support for control refresh rates under Photon.
7. Added 640x400 fullscreen mode emulation via 640x480 (if videodriver not supports original 640x400 mode of course) shifted by 40 vertical pixels from begin, to center it. It's needed for some old DOS games which ran in doubled 320x200 mode.
8. Added available video ram amount support.
8. Added hardware surface allocation/deallocation support if current videomode and videodriver supports it.
9. Added hardware filling support.
10. Added hardware blits support (simple and colorkeyed).
And I've added to testvidinfo test color-keyed blits benchmark (maybe need to add alpha blits benchmark too ?). Currently Photon not supporting any alpha hardware blittings (all drivers lack of alpha blitting code support, only software alpha blitting exist in photon, which is hundreds times slowest than the SDL's one). So I've not added the alpha support. I suppose new QNX 6.3 will have the hardware alpha support, so when it will be done, I'll add alpha support.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 14 Feb 2004 20:22:21 +0000 |
parents | 355632dca928 |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_GL_SetAttribute</TITLE | |
5 ><META | |
6 NAME="GENERATOR" | |
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
0 | 8 "><LINK |
9 REL="HOME" | |
10 TITLE="SDL Library Documentation" | |
11 HREF="index.html"><LINK | |
12 REL="UP" | |
13 TITLE="Video" | |
14 HREF="video.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_GL_GetAttribute" | |
17 HREF="sdlglgetattribute.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_GL_SwapBuffers" | |
20 HREF="sdlglswapbuffers.html"></HEAD | |
21 ><BODY | |
22 CLASS="REFENTRY" | |
23 BGCOLOR="#FFF8DC" | |
24 TEXT="#000000" | |
25 LINK="#0000ee" | |
26 VLINK="#551a8b" | |
27 ALINK="#ff0000" | |
28 ><DIV | |
29 CLASS="NAVHEADER" | |
30 ><TABLE | |
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31 SUMMARY="Header navigation table" |
0 | 32 WIDTH="100%" |
33 BORDER="0" | |
34 CELLPADDING="0" | |
35 CELLSPACING="0" | |
36 ><TR | |
37 ><TH | |
38 COLSPAN="3" | |
39 ALIGN="center" | |
40 >SDL Library Documentation</TH | |
41 ></TR | |
42 ><TR | |
43 ><TD | |
44 WIDTH="10%" | |
45 ALIGN="left" | |
46 VALIGN="bottom" | |
47 ><A | |
48 HREF="sdlglgetattribute.html" | |
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49 ACCESSKEY="P" |
0 | 50 >Prev</A |
51 ></TD | |
52 ><TD | |
53 WIDTH="80%" | |
54 ALIGN="center" | |
55 VALIGN="bottom" | |
56 ></TD | |
57 ><TD | |
58 WIDTH="10%" | |
59 ALIGN="right" | |
60 VALIGN="bottom" | |
61 ><A | |
62 HREF="sdlglswapbuffers.html" | |
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63 ACCESSKEY="N" |
0 | 64 >Next</A |
65 ></TD | |
66 ></TR | |
67 ></TABLE | |
68 ><HR | |
69 ALIGN="LEFT" | |
70 WIDTH="100%"></DIV | |
71 ><H1 | |
72 ><A | |
73 NAME="SDLGLSETATTRIBUTE" | |
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74 ></A |
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75 >SDL_GL_SetAttribute</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN2742" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_GL_SetAttribute -- Set a special SDL/OpenGL attribute</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN2745" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN2746" |
0 | 95 ></A |
96 ><P | |
97 ></P | |
98 ><PRE | |
99 CLASS="FUNCSYNOPSISINFO" | |
100 >#include "SDL.h"</PRE | |
101 ><P | |
102 ><CODE | |
103 ><CODE | |
104 CLASS="FUNCDEF" | |
105 >int <B | |
106 CLASS="FSFUNC" | |
107 >SDL_GL_SetAttribute</B | |
108 ></CODE | |
109 >(SDL_GLattr attr, int value);</CODE | |
110 ></P | |
111 ><P | |
112 ></P | |
113 ></DIV | |
114 ></DIV | |
115 ><DIV | |
116 CLASS="REFSECT1" | |
117 ><A | |
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118 NAME="AEN2752" |
0 | 119 ></A |
120 ><H2 | |
121 >Description</H2 | |
122 ><P | |
123 >Sets the OpenGL <A | |
124 HREF="sdlglattr.html" | |
125 >attribute</A | |
126 > <TT | |
127 CLASS="PARAMETER" | |
128 ><I | |
129 >attr</I | |
130 ></TT | |
131 > to <TT | |
132 CLASS="PARAMETER" | |
133 ><I | |
134 >value</I | |
135 ></TT | |
136 >. The attributes you set don't take effect until after a call to <A | |
137 HREF="sdlsetvideomode.html" | |
138 ><TT | |
139 CLASS="FUNCTION" | |
140 >SDL_SetVideoMode</TT | |
141 ></A | |
142 >. You should use <A | |
143 HREF="sdlglgetattribute.html" | |
144 ><TT | |
145 CLASS="FUNCTION" | |
146 >SDL_GL_GetAttribute</TT | |
147 ></A | |
148 > to check the values after a <TT | |
149 CLASS="FUNCTION" | |
150 >SDL_SetVideoMode</TT | |
151 > call.</P | |
152 ></DIV | |
153 ><DIV | |
154 CLASS="REFSECT1" | |
155 ><A | |
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156 NAME="AEN2763" |
0 | 157 ></A |
158 ><H2 | |
159 >Return Value</H2 | |
160 ><P | |
161 >Returns <SPAN | |
162 CLASS="RETURNVALUE" | |
163 >0</SPAN | |
164 > on success, or <SPAN | |
165 CLASS="RETURNVALUE" | |
166 >-1</SPAN | |
167 > on error.</P | |
168 ></DIV | |
169 ><DIV | |
170 CLASS="REFSECT1" | |
171 ><A | |
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172 NAME="AEN2768" |
0 | 173 ></A |
174 ><H2 | |
175 >Example</H2 | |
176 ><PRE | |
177 CLASS="PROGRAMLISTING" | |
178 >SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 ); | |
179 SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 ); | |
180 SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 ); | |
181 SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 ); | |
182 SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); | |
183 if ( (screen=SDL_SetVideoMode( 640, 480, 16, SDL_OPENGL )) == NULL ) { | |
184 fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError()); | |
185 SDL_Quit(); | |
186 return; | |
187 }</PRE | |
188 ><DIV | |
189 CLASS="NOTE" | |
190 ><BLOCKQUOTE | |
191 CLASS="NOTE" | |
192 ><P | |
193 ><B | |
194 >Note: </B | |
195 >The <TT | |
196 CLASS="LITERAL" | |
197 >SDL_DOUBLEBUF</TT | |
198 > flag is not required to enable double buffering when setting an OpenGL video mode. Double buffering is enabled or disabled using the SDL_GL_DOUBLEBUFFER attribute.</P | |
199 ></BLOCKQUOTE | |
200 ></DIV | |
201 ></DIV | |
202 ><DIV | |
203 CLASS="REFSECT1" | |
204 ><A | |
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205 NAME="AEN2774" |
0 | 206 ></A |
207 ><H2 | |
208 >See Also</H2 | |
209 ><P | |
210 ><A | |
211 HREF="sdlglgetattribute.html" | |
212 ><TT | |
213 CLASS="FUNCTION" | |
214 >SDL_GL_GetAttribute</TT | |
215 ></A | |
216 >, | |
217 <A | |
218 HREF="sdlglattr.html" | |
219 >GL Attributes</A | |
220 ></P | |
221 ></DIV | |
222 ><DIV | |
223 CLASS="NAVFOOTER" | |
224 ><HR | |
225 ALIGN="LEFT" | |
226 WIDTH="100%"><TABLE | |
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227 SUMMARY="Footer navigation table" |
0 | 228 WIDTH="100%" |
229 BORDER="0" | |
230 CELLPADDING="0" | |
231 CELLSPACING="0" | |
232 ><TR | |
233 ><TD | |
234 WIDTH="33%" | |
235 ALIGN="left" | |
236 VALIGN="top" | |
237 ><A | |
238 HREF="sdlglgetattribute.html" | |
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239 ACCESSKEY="P" |
0 | 240 >Prev</A |
241 ></TD | |
242 ><TD | |
243 WIDTH="34%" | |
244 ALIGN="center" | |
245 VALIGN="top" | |
246 ><A | |
247 HREF="index.html" | |
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248 ACCESSKEY="H" |
0 | 249 >Home</A |
250 ></TD | |
251 ><TD | |
252 WIDTH="33%" | |
253 ALIGN="right" | |
254 VALIGN="top" | |
255 ><A | |
256 HREF="sdlglswapbuffers.html" | |
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257 ACCESSKEY="N" |
0 | 258 >Next</A |
259 ></TD | |
260 ></TR | |
261 ><TR | |
262 ><TD | |
263 WIDTH="33%" | |
264 ALIGN="left" | |
265 VALIGN="top" | |
266 >SDL_GL_GetAttribute</TD | |
267 ><TD | |
268 WIDTH="34%" | |
269 ALIGN="center" | |
270 VALIGN="top" | |
271 ><A | |
272 HREF="video.html" | |
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273 ACCESSKEY="U" |
0 | 274 >Up</A |
275 ></TD | |
276 ><TD | |
277 WIDTH="33%" | |
278 ALIGN="right" | |
279 VALIGN="top" | |
280 >SDL_GL_SwapBuffers</TD | |
281 ></TR | |
282 ></TABLE | |
283 ></DIV | |
284 ></BODY | |
285 ></HTML | |
286 > |