Mercurial > sdl-ios-xcode
annotate docs/html/guidetimeexamples.html @ 3335:b8d313de8a65
Adam Strzelecki to SDL
Since current DirectFB implementation is incomplete for YUV surfaces (actually causes segmentation faults when trying Lock and use YUV planar textures) I decided to fix it a bit.
Here's a patch that should make DirectFB properly support YUV both packed and planar (3 planes).
(1) Removed SDL_BYTESPERPIXEL at all in favor of DFB_BYTES_PER_PIXEL(SDLToDFBPixelFormat(fmt)) which does return always proper BPP for YUVs too, coz SDL_BYTESPERPIXEL returns incorrect values for FOURCCs
(2) Fixed data->pixels allocation for planar YUVs in CreateTexture, it should allocate 150% more space
(3) Copy other planes for planar YUVs in UpdateTexture
(4) Moved checking if format is supported at all with DirectFB on CreateTexture at the beginning of the code
Waiting for comments,
--
Adam Strzelecki | nanoant.com
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 04 Oct 2009 04:03:37 +0000 |
parents | 355632dca928 |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >Time Examples</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="Examples" | |
14 HREF="guideexamples.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="CDROM Examples" | |
17 HREF="guidecdromexamples.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL Reference" | |
20 HREF="reference.html"></HEAD | |
21 ><BODY | |
22 CLASS="SECT1" | |
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="guidecdromexamples.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 >Chapter 4. Examples</TD | |
57 ><TD | |
58 WIDTH="10%" | |
59 ALIGN="right" | |
60 VALIGN="bottom" | |
61 ><A | |
62 HREF="reference.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 ><DIV | |
72 CLASS="SECT1" | |
73 ><H1 | |
74 CLASS="SECT1" | |
75 ><A | |
76 NAME="GUIDETIMEEXAMPLES" | |
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77 ></A |
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78 >Time Examples</H1 |
0 | 79 ><P |
80 ></P | |
81 ><DIV | |
82 CLASS="SECT2" | |
83 ><H2 | |
84 CLASS="SECT2" | |
85 ><A | |
55
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86 NAME="AEN412" |
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87 ></A |
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88 >Time based game loop</H2 |
0 | 89 ><P |
90 ><PRE | |
91 CLASS="PROGRAMLISTING" | |
92 >#define TICK_INTERVAL 30 | |
93 | |
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94 static Uint32 next_time; |
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95 |
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96 Uint32 time_left(void) |
0 | 97 { |
98 Uint32 now; | |
99 | |
100 now = SDL_GetTicks(); | |
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101 if(next_time <= now) |
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102 return 0; |
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103 else |
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104 return next_time - now; |
0 | 105 } |
106 | |
107 | |
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108 /* main game loop */ |
0 | 109 |
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110 next_time = SDL_GetTicks() + TICK_INTERVAL; |
0 | 111 while ( game_running ) { |
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112 update_game_state(); |
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113 SDL_Delay(time_left()); |
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114 next_time += TICK_INTERVAL; |
0 | 115 } </PRE |
116 ></P | |
117 ></DIV | |
118 ></DIV | |
119 ><DIV | |
120 CLASS="NAVFOOTER" | |
121 ><HR | |
122 ALIGN="LEFT" | |
123 WIDTH="100%"><TABLE | |
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124 SUMMARY="Footer navigation table" |
0 | 125 WIDTH="100%" |
126 BORDER="0" | |
127 CELLPADDING="0" | |
128 CELLSPACING="0" | |
129 ><TR | |
130 ><TD | |
131 WIDTH="33%" | |
132 ALIGN="left" | |
133 VALIGN="top" | |
134 ><A | |
135 HREF="guidecdromexamples.html" | |
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136 ACCESSKEY="P" |
0 | 137 >Prev</A |
138 ></TD | |
139 ><TD | |
140 WIDTH="34%" | |
141 ALIGN="center" | |
142 VALIGN="top" | |
143 ><A | |
144 HREF="index.html" | |
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145 ACCESSKEY="H" |
0 | 146 >Home</A |
147 ></TD | |
148 ><TD | |
149 WIDTH="33%" | |
150 ALIGN="right" | |
151 VALIGN="top" | |
152 ><A | |
153 HREF="reference.html" | |
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154 ACCESSKEY="N" |
0 | 155 >Next</A |
156 ></TD | |
157 ></TR | |
158 ><TR | |
159 ><TD | |
160 WIDTH="33%" | |
161 ALIGN="left" | |
162 VALIGN="top" | |
163 >CDROM Examples</TD | |
164 ><TD | |
165 WIDTH="34%" | |
166 ALIGN="center" | |
167 VALIGN="top" | |
168 ><A | |
169 HREF="guideexamples.html" | |
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170 ACCESSKEY="U" |
0 | 171 >Up</A |
172 ></TD | |
173 ><TD | |
174 WIDTH="33%" | |
175 ALIGN="right" | |
176 VALIGN="top" | |
177 >SDL Reference</TD | |
178 ></TR | |
179 ></TABLE | |
180 ></DIV | |
181 ></BODY | |
182 ></HTML | |
183 > |