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annotate docs/html/guidevideoopengl.html @ 2818:4e09acde4333

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author Ryan C. Gordon <icculus@icculus.org>
date Mon, 01 Dec 2008 09:09:31 +0000
parents f12379c41042
children
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >Using OpenGL With SDL</TITLE
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5 ><META
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6 NAME="GENERATOR"
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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8 "><LINK
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9 REL="HOME"
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10 TITLE="SDL Library Documentation"
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11 HREF="index.html"><LINK
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12 REL="UP"
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13 TITLE="Graphics and Video"
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14 HREF="guidevideo.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="Graphics and Video"
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17 HREF="guidevideo.html"><LINK
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18 REL="NEXT"
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19 TITLE="Input handling"
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20 HREF="guideinput.html"></HEAD
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21 ><BODY
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22 CLASS="SECT1"
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23 BGCOLOR="#FFF8DC"
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24 TEXT="#000000"
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25 LINK="#0000ee"
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26 VLINK="#551a8b"
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27 ALINK="#ff0000"
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28 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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31 SUMMARY="Header navigation table"
55
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32 WIDTH="100%"
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33 BORDER="0"
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34 CELLPADDING="0"
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35 CELLSPACING="0"
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36 ><TR
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37 ><TH
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38 COLSPAN="3"
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39 ALIGN="center"
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40 >SDL Library Documentation</TH
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41 ></TR
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42 ><TR
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43 ><TD
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44 WIDTH="10%"
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45 ALIGN="left"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="guidevideo.html"
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49 ACCESSKEY="P"
55
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50 >Prev</A
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51 ></TD
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52 ><TD
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53 WIDTH="80%"
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54 ALIGN="center"
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55 VALIGN="bottom"
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56 >Chapter 2. Graphics and Video</TD
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57 ><TD
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58 WIDTH="10%"
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59 ALIGN="right"
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60 VALIGN="bottom"
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61 ><A
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62 HREF="guideinput.html"
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63 ACCESSKEY="N"
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64 >Next</A
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65 ></TD
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66 ></TR
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67 ></TABLE
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68 ><HR
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69 ALIGN="LEFT"
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70 WIDTH="100%"></DIV
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71 ><DIV
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72 CLASS="SECT1"
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73 ><H1
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74 CLASS="SECT1"
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75 ><A
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76 NAME="GUIDEVIDEOOPENGL"
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77 ></A
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78 >Using OpenGL With SDL</H1
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79 ><P
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80 >SDL has the ability to create and use OpenGL contexts on several platforms(Linux/X11, Win32, BeOS, MacOS Classic/Toolbox, Mac OS X, FreeBSD/X11 and Solaris/X11). This allows you to use SDL's audio, event handling, threads and times in your OpenGL applications (a function often performed by GLUT).</P
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81 ><DIV
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82 CLASS="SECT2"
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83 ><H2
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84 CLASS="SECT2"
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85 ><A
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86 NAME="AEN103"
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87 ></A
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88 >Initialisation</H2
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89 ><P
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90 >Initialising SDL to use OpenGL is not very different to initialising SDL normally. There are three differences; you must pass <TT
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91 CLASS="LITERAL"
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92 >SDL_OPENGL</TT
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93 > to <A
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94 HREF="sdlsetvideomode.html"
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95 ><TT
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96 CLASS="FUNCTION"
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97 >SDL_SetVideoMode</TT
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98 ></A
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99 >, you must specify several GL attributes (depth buffer size, framebuffer sizes) using <A
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100 HREF="sdlglsetattribute.html"
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101 ><TT
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102 CLASS="FUNCTION"
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103 >SDL_GL_SetAttribute</TT
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104 ></A
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105 > and finally, if you wish to use double buffering you must specify it as a GL attribute, <SPAN
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106 CLASS="emphasis"
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107 ><I
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108 CLASS="EMPHASIS"
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109 >not</I
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110 ></SPAN
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111 > by passing the <TT
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112 CLASS="LITERAL"
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113 >SDL_DOUBLEBUF</TT
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114 > flag to <TT
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115 CLASS="FUNCTION"
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116 >SDL_SetVideoMode</TT
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117 >.</P
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118 ><DIV
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119 CLASS="EXAMPLE"
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120 ><A
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121 NAME="AEN114"
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122 ></A
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123 ><P
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124 ><B
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125 >Example 2-7. Initializing SDL with OpenGL</B
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126 ></P
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127 ><PRE
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128 CLASS="PROGRAMLISTING"
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129 > /* Information about the current video settings. */
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130 const SDL_VideoInfo* info = NULL;
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131 /* Dimensions of our window. */
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132 int width = 0;
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133 int height = 0;
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134 /* Color depth in bits of our window. */
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135 int bpp = 0;
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136 /* Flags we will pass into SDL_SetVideoMode. */
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137 int flags = 0;
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138
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139 /* First, initialize SDL's video subsystem. */
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140 if( SDL_Init( SDL_INIT_VIDEO ) &#60; 0 ) {
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141 /* Failed, exit. */
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142 fprintf( stderr, "Video initialization failed: %s\n",
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143 SDL_GetError( ) );
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144 quit_tutorial( 1 );
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145 }
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146
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147 /* Let's get some video information. */
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148 info = SDL_GetVideoInfo( );
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149
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150 if( !info ) {
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151 /* This should probably never happen. */
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152 fprintf( stderr, "Video query failed: %s\n",
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153 SDL_GetError( ) );
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154 quit_tutorial( 1 );
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155 }
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156
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157 /*
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158 * Set our width/height to 640/480 (you would
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159 * of course let the user decide this in a normal
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160 * app). We get the bpp we will request from
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161 * the display. On X11, VidMode can't change
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162 * resolution, so this is probably being overly
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163 * safe. Under Win32, ChangeDisplaySettings
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164 * can change the bpp.
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165 */
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166 width = 640;
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167 height = 480;
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168 bpp = info-&#62;vfmt-&#62;BitsPerPixel;
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169
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170 /*
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171 * Now, we want to setup our requested
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172 * window attributes for our OpenGL window.
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173 * We want *at least* 5 bits of red, green
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174 * and blue. We also want at least a 16-bit
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175 * depth buffer.
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176 *
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177 * The last thing we do is request a double
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178 * buffered window. '1' turns on double
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179 * buffering, '0' turns it off.
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180 *
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181 * Note that we do not use SDL_DOUBLEBUF in
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182 * the flags to SDL_SetVideoMode. That does
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183 * not affect the GL attribute state, only
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184 * the standard 2D blitting setup.
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185 */
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186 SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
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187 SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 );
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188 SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );
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189 SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
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190 SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
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191
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192 /*
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193 * We want to request that SDL provide us
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194 * with an OpenGL window, in a fullscreen
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195 * video mode.
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196 *
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197 * EXERCISE:
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198 * Make starting windowed an option, and
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199 * handle the resize events properly with
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200 * glViewport.
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201 */
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202 flags = SDL_OPENGL | SDL_FULLSCREEN;
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203
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204 /*
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205 * Set the video mode
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206 */
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207 if( SDL_SetVideoMode( width, height, bpp, flags ) == 0 ) {
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208 /*
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209 * This could happen for a variety of reasons,
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210 * including DISPLAY not being set, the specified
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211 * resolution not being available, etc.
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212 */
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213 fprintf( stderr, "Video mode set failed: %s\n",
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214 SDL_GetError( ) );
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215 quit_tutorial( 1 );
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216 }</PRE
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217 ></DIV
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218 ></DIV
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219 ><DIV
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220 CLASS="SECT2"
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221 ><H2
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222 CLASS="SECT2"
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223 ><A
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224 NAME="AEN117"
803
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225 ></A
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226 >Drawing</H2
55
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227 ><P
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228 >Apart from initialisation, using OpenGL within SDL is the same as using OpenGL
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229 with any other API, e.g. GLUT. You still use all the same function calls and
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230 data types. However if you are using a double-buffered display, then you must
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231 use
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232 <A
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233 HREF="sdlglswapbuffers.html"
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234 ><TT
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235 CLASS="FUNCTION"
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236 >SDL_GL_SwapBuffers()</TT
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237 ></A
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238 >
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239 to swap the buffers and update the display. To request double-buffering
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240 with OpenGL, use
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241 <A
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242 HREF="sdlglsetattribute.html"
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243 ><TT
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244 CLASS="FUNCTION"
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245 >SDL_GL_SetAttribute</TT
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246 ></A
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247 >
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248 with <TT
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249 CLASS="LITERAL"
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250 >SDL_GL_DOUBLEBUFFER</TT
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251 >, and use
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252 <A
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253 HREF="sdlglgetattribute.html"
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254 ><TT
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255 CLASS="FUNCTION"
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256 >SDL_GL_GetAttribute</TT
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257 ></A
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258 >
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259 to see if you actually got it.</P
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260 ><P
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261 >A full example code listing is now presented below.</P
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262 ><DIV
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263 CLASS="EXAMPLE"
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264 ><A
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265 NAME="AEN128"
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266 ></A
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267 ><P
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268 ><B
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269 >Example 2-8. SDL and OpenGL</B
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270 ></P
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271 ><PRE
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272 CLASS="PROGRAMLISTING"
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273 >/*
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274 * SDL OpenGL Tutorial.
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275 * (c) Michael Vance, 2000
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276 * briareos@lokigames.com
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277 *
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278 * Distributed under terms of the LGPL.
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279 */
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280
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281 #include &#60;SDL/SDL.h&#62;
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282 #include &#60;GL/gl.h&#62;
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283 #include &#60;GL/glu.h&#62;
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284
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285 #include &#60;stdio.h&#62;
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286 #include &#60;stdlib.h&#62;
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287
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288 static GLboolean should_rotate = GL_TRUE;
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289
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290 static void quit_tutorial( int code )
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291 {
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292 /*
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293 * Quit SDL so we can release the fullscreen
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294 * mode and restore the previous video settings,
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295 * etc.
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296 */
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297 SDL_Quit( );
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298
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299 /* Exit program. */
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300 exit( code );
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301 }
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302
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303 static void handle_key_down( SDL_keysym* keysym )
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304 {
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305
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306 /*
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307 * We're only interested if 'Esc' has
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308 * been presssed.
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309 *
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310 * EXERCISE:
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311 * Handle the arrow keys and have that change the
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312 * viewing position/angle.
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313 */
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314 switch( keysym-&#62;sym ) {
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315 case SDLK_ESCAPE:
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316 quit_tutorial( 0 );
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317 break;
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318 case SDLK_SPACE:
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319 should_rotate = !should_rotate;
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320 break;
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321 default:
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322 break;
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323 }
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324
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325 }
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326
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327 static void process_events( void )
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328 {
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329 /* Our SDL event placeholder. */
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330 SDL_Event event;
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331
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332 /* Grab all the events off the queue. */
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333 while( SDL_PollEvent( &#38;event ) ) {
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334
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335 switch( event.type ) {
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336 case SDL_KEYDOWN:
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337 /* Handle key presses. */
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338 handle_key_down( &#38;event.key.keysym );
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339 break;
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340 case SDL_QUIT:
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341 /* Handle quit requests (like Ctrl-c). */
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342 quit_tutorial( 0 );
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343 break;
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344 }
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345
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346 }
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347
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348 }
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349
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350 static void draw_screen( void )
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351 {
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352 /* Our angle of rotation. */
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353 static float angle = 0.0f;
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354
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355 /*
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356 * EXERCISE:
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357 * Replace this awful mess with vertex
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358 * arrays and a call to glDrawElements.
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359 *
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360 * EXERCISE:
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361 * After completing the above, change
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362 * it to use compiled vertex arrays.
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363 *
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364 * EXERCISE:
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365 * Verify my windings are correct here ;).
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366 */
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367 static GLfloat v0[] = { -1.0f, -1.0f, 1.0f };
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368 static GLfloat v1[] = { 1.0f, -1.0f, 1.0f };
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369 static GLfloat v2[] = { 1.0f, 1.0f, 1.0f };
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370 static GLfloat v3[] = { -1.0f, 1.0f, 1.0f };
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371 static GLfloat v4[] = { -1.0f, -1.0f, -1.0f };
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372 static GLfloat v5[] = { 1.0f, -1.0f, -1.0f };
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373 static GLfloat v6[] = { 1.0f, 1.0f, -1.0f };
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374 static GLfloat v7[] = { -1.0f, 1.0f, -1.0f };
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375 static GLubyte red[] = { 255, 0, 0, 255 };
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376 static GLubyte green[] = { 0, 255, 0, 255 };
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377 static GLubyte blue[] = { 0, 0, 255, 255 };
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378 static GLubyte white[] = { 255, 255, 255, 255 };
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379 static GLubyte yellow[] = { 0, 255, 255, 255 };
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380 static GLubyte black[] = { 0, 0, 0, 255 };
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381 static GLubyte orange[] = { 255, 255, 0, 255 };
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382 static GLubyte purple[] = { 255, 0, 255, 0 };
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383
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384 /* Clear the color and depth buffers. */
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385 glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
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386
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387 /* We don't want to modify the projection matrix. */
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388 glMatrixMode( GL_MODELVIEW );
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389 glLoadIdentity( );
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390
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391 /* Move down the z-axis. */
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392 glTranslatef( 0.0, 0.0, -5.0 );
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393
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394 /* Rotate. */
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395 glRotatef( angle, 0.0, 1.0, 0.0 );
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396
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397 if( should_rotate ) {
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398
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399 if( ++angle &#62; 360.0f ) {
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400 angle = 0.0f;
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401 }
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diff changeset
402
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diff changeset
403 }
55f1f1b3e27d Added new docs for SDL 1.2.1
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parents:
diff changeset
404
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parents:
diff changeset
405 /* Send our triangle data to the pipeline. */
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diff changeset
406 glBegin( GL_TRIANGLES );
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diff changeset
407
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diff changeset
408 glColor4ubv( red );
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diff changeset
409 glVertex3fv( v0 );
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diff changeset
410 glColor4ubv( green );
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diff changeset
411 glVertex3fv( v1 );
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diff changeset
412 glColor4ubv( blue );
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diff changeset
413 glVertex3fv( v2 );
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diff changeset
414
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diff changeset
415 glColor4ubv( red );
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diff changeset
416 glVertex3fv( v0 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 glColor4ubv( blue );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418 glVertex3fv( v2 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
419 glColor4ubv( white );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
420 glVertex3fv( v3 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
421
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422 glColor4ubv( green );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 glVertex3fv( v1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424 glColor4ubv( black );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 glVertex3fv( v5 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 glColor4ubv( orange );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 glVertex3fv( v6 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429 glColor4ubv( green );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 glVertex3fv( v1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431 glColor4ubv( orange );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432 glVertex3fv( v6 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
433 glColor4ubv( blue );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 glVertex3fv( v2 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 glColor4ubv( black );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437 glVertex3fv( v5 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 glColor4ubv( yellow );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
439 glVertex3fv( v4 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440 glColor4ubv( purple );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
441 glVertex3fv( v7 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 glColor4ubv( black );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 glVertex3fv( v5 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 glColor4ubv( purple );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
446 glVertex3fv( v7 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
447 glColor4ubv( orange );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
448 glVertex3fv( v6 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
449
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450 glColor4ubv( yellow );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 glVertex3fv( v4 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
452 glColor4ubv( red );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
453 glVertex3fv( v0 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
454 glColor4ubv( white );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
455 glVertex3fv( v3 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
456
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
457 glColor4ubv( yellow );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
458 glVertex3fv( v4 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 glColor4ubv( white );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460 glVertex3fv( v3 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461 glColor4ubv( purple );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
462 glVertex3fv( v7 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
463
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
464 glColor4ubv( white );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
465 glVertex3fv( v3 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
466 glColor4ubv( blue );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
467 glVertex3fv( v2 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
468 glColor4ubv( orange );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
469 glVertex3fv( v6 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
470
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
471 glColor4ubv( white );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
472 glVertex3fv( v3 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
473 glColor4ubv( orange );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
474 glVertex3fv( v6 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
475 glColor4ubv( purple );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
476 glVertex3fv( v7 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
477
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
478 glColor4ubv( green );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
479 glVertex3fv( v1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
480 glColor4ubv( red );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
481 glVertex3fv( v0 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
482 glColor4ubv( yellow );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
483 glVertex3fv( v4 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
484
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
485 glColor4ubv( green );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
486 glVertex3fv( v1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
487 glColor4ubv( yellow );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
488 glVertex3fv( v4 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
489 glColor4ubv( black );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
490 glVertex3fv( v5 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
491
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
492 glEnd( );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
493
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
494 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
495 * EXERCISE:
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
496 * Draw text telling the user that 'Spc'
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
497 * pauses the rotation and 'Esc' quits.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
498 * Do it using vetors and textured quads.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
499 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
500
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
501 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
502 * Swap the buffers. This this tells the driver to
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
503 * render the next frame from the contents of the
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
504 * back-buffer, and to set all rendering operations
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
505 * to occur on what was the front-buffer.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
506 *
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
507 * Double buffering prevents nasty visual tearing
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
508 * from the application drawing on areas of the
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
509 * screen that are being updated at the same time.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
510 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
511 SDL_GL_SwapBuffers( );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
512 }
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
513
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
514 static void setup_opengl( int width, int height )
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
515 {
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
516 float ratio = (float) width / (float) height;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
517
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
518 /* Our shading model--Gouraud (smooth). */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
519 glShadeModel( GL_SMOOTH );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
520
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
521 /* Culling. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
522 glCullFace( GL_BACK );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
523 glFrontFace( GL_CCW );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
524 glEnable( GL_CULL_FACE );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
525
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
526 /* Set the clear color. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
527 glClearColor( 0, 0, 0, 0 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
528
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
529 /* Setup our viewport. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
530 glViewport( 0, 0, width, height );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
531
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
532 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
533 * Change to the projection matrix and set
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
534 * our viewing volume.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
535 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
536 glMatrixMode( GL_PROJECTION );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
537 glLoadIdentity( );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
538 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
539 * EXERCISE:
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
540 * Replace this with a call to glFrustum.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
541 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
542 gluPerspective( 60.0, ratio, 1.0, 1024.0 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
543 }
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
544
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
545 int main( int argc, char* argv[] )
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
546 {
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
547 /* Information about the current video settings. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
548 const SDL_VideoInfo* info = NULL;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
549 /* Dimensions of our window. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
550 int width = 0;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
551 int height = 0;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
552 /* Color depth in bits of our window. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
553 int bpp = 0;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
554 /* Flags we will pass into SDL_SetVideoMode. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
555 int flags = 0;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
556
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
557 /* First, initialize SDL's video subsystem. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
558 if( SDL_Init( SDL_INIT_VIDEO ) &#60; 0 ) {
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
559 /* Failed, exit. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
560 fprintf( stderr, "Video initialization failed: %s\n",
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
561 SDL_GetError( ) );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
562 quit_tutorial( 1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
563 }
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
564
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
565 /* Let's get some video information. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
566 info = SDL_GetVideoInfo( );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
567
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
568 if( !info ) {
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
569 /* This should probably never happen. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
570 fprintf( stderr, "Video query failed: %s\n",
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
571 SDL_GetError( ) );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
572 quit_tutorial( 1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
573 }
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
574
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
575 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
576 * Set our width/height to 640/480 (you would
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
577 * of course let the user decide this in a normal
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
578 * app). We get the bpp we will request from
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
579 * the display. On X11, VidMode can't change
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
580 * resolution, so this is probably being overly
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
581 * safe. Under Win32, ChangeDisplaySettings
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
582 * can change the bpp.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
583 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
584 width = 640;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
585 height = 480;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
586 bpp = info-&#62;vfmt-&#62;BitsPerPixel;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
587
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
588 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
589 * Now, we want to setup our requested
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
590 * window attributes for our OpenGL window.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
591 * We want *at least* 5 bits of red, green
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
592 * and blue. We also want at least a 16-bit
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
593 * depth buffer.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
594 *
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
595 * The last thing we do is request a double
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
596 * buffered window. '1' turns on double
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
597 * buffering, '0' turns it off.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
598 *
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
599 * Note that we do not use SDL_DOUBLEBUF in
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
600 * the flags to SDL_SetVideoMode. That does
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
601 * not affect the GL attribute state, only
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
602 * the standard 2D blitting setup.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
603 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
604 SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
605 SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
606 SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
607 SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
608 SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
609
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
610 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
611 * We want to request that SDL provide us
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
612 * with an OpenGL window, in a fullscreen
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
613 * video mode.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
614 *
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
615 * EXERCISE:
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
616 * Make starting windowed an option, and
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
617 * handle the resize events properly with
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
618 * glViewport.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
619 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
620 flags = SDL_OPENGL | SDL_FULLSCREEN;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
621
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
622 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
623 * Set the video mode
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
624 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
625 if( SDL_SetVideoMode( width, height, bpp, flags ) == 0 ) {
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
626 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
627 * This could happen for a variety of reasons,
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
628 * including DISPLAY not being set, the specified
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
629 * resolution not being available, etc.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
630 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
631 fprintf( stderr, "Video mode set failed: %s\n",
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
632 SDL_GetError( ) );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
633 quit_tutorial( 1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
634 }
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
635
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
636 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
637 * At this point, we should have a properly setup
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
638 * double-buffered window for use with OpenGL.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
639 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
640 setup_opengl( width, height );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
641
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
642 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
643 * Now we want to begin our normal app process--
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
644 * an event loop with a lot of redrawing.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
645 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
646 while( 1 ) {
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
647 /* Process incoming events. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
648 process_events( );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
649 /* Draw the screen. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
650 draw_screen( );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
651 }
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
652
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
653 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
654 * EXERCISE:
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
655 * Record timings using SDL_GetTicks() and
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
656 * and print out frames per second at program
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
657 * end.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
658 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
659
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
660 /* Never reached. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
661 return 0;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
662 }</PRE
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
663 ></DIV
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
664 ></DIV
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
665 ></DIV
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
666 ><DIV
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
667 CLASS="NAVFOOTER"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
668 ><HR
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
669 ALIGN="LEFT"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
670 WIDTH="100%"><TABLE
803
355632dca928 Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents: 55
diff changeset
671 SUMMARY="Footer navigation table"
55
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
672 WIDTH="100%"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
673 BORDER="0"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
674 CELLPADDING="0"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
675 CELLSPACING="0"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
676 ><TR
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
677 ><TD
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
678 WIDTH="33%"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
679 ALIGN="left"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
680 VALIGN="top"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
681 ><A
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
682 HREF="guidevideo.html"
803
355632dca928 Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents: 55
diff changeset
683 ACCESSKEY="P"
55
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
684 >Prev</A
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
685 ></TD
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
686 ><TD
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
687 WIDTH="34%"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
688 ALIGN="center"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
689 VALIGN="top"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
690 ><A
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
691 HREF="index.html"
803
355632dca928 Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents: 55
diff changeset
692 ACCESSKEY="H"
55
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
693 >Home</A
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
694 ></TD
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
695 ><TD
55f1f1b3e27d Added new docs for SDL 1.2.1
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696 WIDTH="33%"
55f1f1b3e27d Added new docs for SDL 1.2.1
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697 ALIGN="right"
55f1f1b3e27d Added new docs for SDL 1.2.1
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698 VALIGN="top"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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699 ><A
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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700 HREF="guideinput.html"
803
355632dca928 Updated SDL HTML documentation
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diff changeset
701 ACCESSKEY="N"
55
55f1f1b3e27d Added new docs for SDL 1.2.1
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702 >Next</A
55f1f1b3e27d Added new docs for SDL 1.2.1
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703 ></TD
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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704 ></TR
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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705 ><TR
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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706 ><TD
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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707 WIDTH="33%"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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diff changeset
708 ALIGN="left"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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709 VALIGN="top"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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710 >Graphics and Video</TD
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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711 ><TD
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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712 WIDTH="34%"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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713 ALIGN="center"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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714 VALIGN="top"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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715 ><A
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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716 HREF="guidevideo.html"
803
355632dca928 Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
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diff changeset
717 ACCESSKEY="U"
55
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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718 >Up</A
55f1f1b3e27d Added new docs for SDL 1.2.1
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719 ></TD
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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720 ><TD
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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721 WIDTH="33%"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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722 ALIGN="right"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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723 VALIGN="top"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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724 >Input handling</TD
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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725 ></TR
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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726 ></TABLE
55f1f1b3e27d Added new docs for SDL 1.2.1
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727 ></DIV
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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728 ></BODY
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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729 ></HTML
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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730 >