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annotate docs/html/guidevideoopengl.html @ 630:550bccdf04bd

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Added initial support for RISC OS (thanks Peter Naulls!)
author Sam Lantinga <slouken@libsdl.org>
date Thu, 29 May 2003 04:44:13 +0000
parents 55f1f1b3e27d
children 355632dca928
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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 1.64
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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 WIDTH="100%"
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32 BORDER="0"
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33 CELLPADDING="0"
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34 CELLSPACING="0"
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35 ><TR
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36 ><TH
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37 COLSPAN="3"
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38 ALIGN="center"
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39 >SDL Library Documentation</TH
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40 ></TR
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41 ><TR
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42 ><TD
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43 WIDTH="10%"
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44 ALIGN="left"
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45 VALIGN="bottom"
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46 ><A
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47 HREF="guidevideo.html"
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48 >Prev</A
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49 ></TD
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50 ><TD
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51 WIDTH="80%"
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52 ALIGN="center"
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53 VALIGN="bottom"
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54 >Chapter 2. Graphics and Video</TD
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55 ><TD
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56 WIDTH="10%"
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57 ALIGN="right"
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58 VALIGN="bottom"
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59 ><A
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60 HREF="guideinput.html"
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61 >Next</A
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62 ></TD
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63 ></TR
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64 ></TABLE
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65 ><HR
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66 ALIGN="LEFT"
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67 WIDTH="100%"></DIV
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68 ><DIV
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69 CLASS="SECT1"
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70 ><H1
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71 CLASS="SECT1"
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72 ><A
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73 NAME="GUIDEVIDEOOPENGL"
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74 >Using OpenGL With SDL</A
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75 ></H1
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76 ><P
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77 >SDL has the ability to create and use OpenGL contexts on several platforms(Linux/X11, Win32, BeOS, MacOS Classic/Toolbox, MacOS 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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78 ><DIV
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79 CLASS="SECT2"
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80 ><H2
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81 CLASS="SECT2"
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82 ><A
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83 NAME="AEN103"
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84 >Initialisation</A
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85 ></H2
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86 ><P
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87 >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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88 CLASS="LITERAL"
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89 >SDL_OPENGL</TT
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90 > to <A
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91 HREF="sdlsetvideomode.html"
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92 ><TT
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93 CLASS="FUNCTION"
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94 >SDL_SetVideoMode</TT
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95 ></A
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96 >, you must specify several GL attributes (depth buffer size, framebuffer sizes) using <A
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97 HREF="sdlglsetattribute.html"
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98 ><TT
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99 CLASS="FUNCTION"
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100 >SDL_GL_SetAttribute</TT
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101 ></A
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102 > and finally, if you wish to use double buffering you must specify it as a GL attribute, <I
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103 CLASS="EMPHASIS"
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104 >not</I
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105 > by passing the <TT
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106 CLASS="LITERAL"
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107 >SDL_DOUBLEBUF</TT
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108 > flag to <TT
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109 CLASS="FUNCTION"
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110 >SDL_SetVideoMode</TT
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111 >.</P
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112 ><DIV
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113 CLASS="EXAMPLE"
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114 ><A
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115 NAME="AEN114"
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116 ></A
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117 ><P
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118 ><B
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119 >Example 2-7. Initializing SDL with OpenGL</B
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120 ></P
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121 ><PRE
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122 CLASS="PROGRAMLISTING"
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123 > /* Information about the current video settings. */
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124 const SDL_VideoInfo* info = NULL;
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125 /* Dimensions of our window. */
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126 int width = 0;
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127 int height = 0;
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128 /* Color depth in bits of our window. */
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129 int bpp = 0;
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130 /* Flags we will pass into SDL_SetVideoMode. */
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131 int flags = 0;
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132
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133 /* First, initialize SDL's video subsystem. */
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134 if( SDL_Init( SDL_INIT_VIDEO ) &#60; 0 ) {
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135 /* Failed, exit. */
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136 fprintf( stderr, "Video initialization failed: %s\n",
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137 SDL_GetError( ) );
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138 quit_tutorial( 1 );
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139 }
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140
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141 /* Let's get some video information. */
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142 info = SDL_GetVideoInfo( );
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143
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144 if( !info ) {
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145 /* This should probably never happen. */
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146 fprintf( stderr, "Video query failed: %s\n",
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147 SDL_GetError( ) );
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148 quit_tutorial( 1 );
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149 }
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150
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151 /*
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152 * Set our width/height to 640/480 (you would
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153 * of course let the user decide this in a normal
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154 * app). We get the bpp we will request from
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155 * the display. On X11, VidMode can't change
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156 * resolution, so this is probably being overly
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157 * safe. Under Win32, ChangeDisplaySettings
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158 * can change the bpp.
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159 */
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160 width = 640;
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161 height = 480;
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162 bpp = info-&#62;vfmt-&#62;BitsPerPixel;
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163
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164 /*
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165 * Now, we want to setup our requested
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166 * window attributes for our OpenGL window.
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167 * We want *at least* 5 bits of red, green
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168 * and blue. We also want at least a 16-bit
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169 * depth buffer.
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170 *
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171 * The last thing we do is request a double
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172 * buffered window. '1' turns on double
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173 * buffering, '0' turns it off.
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174 *
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175 * Note that we do not use SDL_DOUBLEBUF in
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176 * the flags to SDL_SetVideoMode. That does
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177 * not affect the GL attribute state, only
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178 * the standard 2D blitting setup.
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179 */
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180 SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
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181 SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 );
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182 SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );
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183 SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
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184 SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
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185
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186 /*
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187 * We want to request that SDL provide us
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188 * with an OpenGL window, in a fullscreen
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189 * video mode.
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190 *
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191 * EXERCISE:
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192 * Make starting windowed an option, and
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193 * handle the resize events properly with
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194 * glViewport.
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195 */
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196 flags = SDL_OPENGL | SDL_FULLSCREEN;
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197
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198 /*
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199 * Set the video mode
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200 */
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201 if( SDL_SetVideoMode( width, height, bpp, flags ) == 0 ) {
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202 /*
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203 * This could happen for a variety of reasons,
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204 * including DISPLAY not being set, the specified
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205 * resolution not being available, etc.
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206 */
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207 fprintf( stderr, "Video mode set failed: %s\n",
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208 SDL_GetError( ) );
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209 quit_tutorial( 1 );
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210 }</PRE
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211 ></DIV
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212 ></DIV
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213 ><DIV
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214 CLASS="SECT2"
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215 ><H2
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216 CLASS="SECT2"
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217 ><A
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218 NAME="AEN117"
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219 >Drawing</A
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220 ></H2
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221 ><P
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222 >Apart from initialisation, using OpenGL within SDL is the same as using OpenGL
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223 with any other API, e.g. GLUT. You still use all the same function calls and
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224 data types. However if you are using a double-buffered display, then you must
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225 use
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226 <A
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227 HREF="sdlglswapbuffers.html"
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228 ><TT
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229 CLASS="FUNCTION"
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230 >SDL_GL_SwapBuffers()</TT
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231 ></A
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232 >
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233 to swap the buffers and update the display. To request double-buffering
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234 with OpenGL, use
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235 <A
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236 HREF="sdlglsetattribute.html"
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237 ><TT
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238 CLASS="FUNCTION"
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239 >SDL_GL_SetAttribute</TT
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240 ></A
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241 >
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242 with <TT
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243 CLASS="LITERAL"
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244 >SDL_GL_DOUBLEBUFFER</TT
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245 >, and use
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246 <A
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247 HREF="sdlglgetattribute.html"
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248 ><TT
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249 CLASS="FUNCTION"
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250 >SDL_GL_GetAttribute</TT
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251 ></A
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252 >
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253 to see if you actually got it.</P
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254 ><P
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255 >A full example code listing is now presented below.</P
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256 ><DIV
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257 CLASS="EXAMPLE"
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258 ><A
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259 NAME="AEN128"
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260 ></A
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261 ><P
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262 ><B
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263 >Example 2-8. SDL and OpenGL</B
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264 ></P
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265 ><PRE
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266 CLASS="PROGRAMLISTING"
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267 >/*
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268 * SDL OpenGL Tutorial.
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269 * (c) Michael Vance, 2000
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270 * briareos@lokigames.com
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271 *
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272 * Distributed under terms of the LGPL.
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273 */
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274
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275 #include &#60;SDL/SDL.h&#62;
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276 #include &#60;GL/gl.h&#62;
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277 #include &#60;GL/glu.h&#62;
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278
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279 #include &#60;stdio.h&#62;
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280 #include &#60;stdlib.h&#62;
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281
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282 static GLboolean should_rotate = GL_TRUE;
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283
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284 static void quit_tutorial( int code )
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285 {
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286 /*
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287 * Quit SDL so we can release the fullscreen
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288 * mode and restore the previous video settings,
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289 * etc.
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290 */
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291 SDL_Quit( );
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292
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293 /* Exit program. */
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294 exit( code );
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295 }
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296
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297 static void handle_key_down( SDL_keysym* keysym )
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298 {
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299
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300 /*
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301 * We're only interested if 'Esc' has
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302 * been presssed.
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303 *
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304 * EXERCISE:
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305 * Handle the arrow keys and have that change the
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306 * viewing position/angle.
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307 */
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308 switch( keysym-&#62;sym ) {
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309 case SDLK_ESCAPE:
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310 quit_tutorial( 0 );
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311 break;
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312 case SDLK_SPACE:
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313 should_rotate = !should_rotate;
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314 break;
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315 default:
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316 break;
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317 }
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318
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319 }
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320
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321 static void process_events( void )
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322 {
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323 /* Our SDL event placeholder. */
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324 SDL_Event event;
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325
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326 /* Grab all the events off the queue. */
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327 while( SDL_PollEvent( &#38;event ) ) {
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328
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329 switch( event.type ) {
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330 case SDL_KEYDOWN:
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331 /* Handle key presses. */
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332 handle_key_down( &#38;event.key.keysym );
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333 break;
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334 case SDL_QUIT:
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335 /* Handle quit requests (like Ctrl-c). */
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336 quit_tutorial( 0 );
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337 break;
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338 }
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339
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340 }
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341
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342 }
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343
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344 static void draw_screen( void )
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345 {
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346 /* Our angle of rotation. */
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347 static float angle = 0.0f;
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348
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349 /*
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350 * EXERCISE:
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351 * Replace this awful mess with vertex
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352 * arrays and a call to glDrawElements.
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353 *
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354 * EXERCISE:
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355 * After completing the above, change
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356 * it to use compiled vertex arrays.
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357 *
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358 * EXERCISE:
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359 * Verify my windings are correct here ;).
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360 */
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361 static GLfloat v0[] = { -1.0f, -1.0f, 1.0f };
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362 static GLfloat v1[] = { 1.0f, -1.0f, 1.0f };
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363 static GLfloat v2[] = { 1.0f, 1.0f, 1.0f };
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364 static GLfloat v3[] = { -1.0f, 1.0f, 1.0f };
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365 static GLfloat v4[] = { -1.0f, -1.0f, -1.0f };
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366 static GLfloat v5[] = { 1.0f, -1.0f, -1.0f };
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367 static GLfloat v6[] = { 1.0f, 1.0f, -1.0f };
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368 static GLfloat v7[] = { -1.0f, 1.0f, -1.0f };
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369 static GLubyte red[] = { 255, 0, 0, 255 };
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370 static GLubyte green[] = { 0, 255, 0, 255 };
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371 static GLubyte blue[] = { 0, 0, 255, 255 };
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372 static GLubyte white[] = { 255, 255, 255, 255 };
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373 static GLubyte yellow[] = { 0, 255, 255, 255 };
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374 static GLubyte black[] = { 0, 0, 0, 255 };
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375 static GLubyte orange[] = { 255, 255, 0, 255 };
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376 static GLubyte purple[] = { 255, 0, 255, 0 };
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377
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378 /* Clear the color and depth buffers. */
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379 glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
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380
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381 /* We don't want to modify the projection matrix. */
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382 glMatrixMode( GL_MODELVIEW );
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383 glLoadIdentity( );
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384
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385 /* Move down the z-axis. */
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386 glTranslatef( 0.0, 0.0, -5.0 );
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387
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388 /* Rotate. */
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389 glRotatef( angle, 0.0, 1.0, 0.0 );
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390
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391 if( should_rotate ) {
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392
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393 if( ++angle &#62; 360.0f ) {
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394 angle = 0.0f;
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395 }
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396
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397 }
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398
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399 /* Send our triangle data to the pipeline. */
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400 glBegin( GL_TRIANGLES );
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401
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402 glColor4ubv( red );
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403 glVertex3fv( v0 );
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404 glColor4ubv( green );
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405 glVertex3fv( v1 );
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406 glColor4ubv( blue );
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407 glVertex3fv( v2 );
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408
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409 glColor4ubv( red );
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410 glVertex3fv( v0 );
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411 glColor4ubv( blue );
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412 glVertex3fv( v2 );
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413 glColor4ubv( white );
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diff changeset
414 glVertex3fv( v3 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
416 glColor4ubv( green );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 glVertex3fv( v1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418 glColor4ubv( black );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
419 glVertex3fv( v5 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
420 glColor4ubv( orange );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
421 glVertex3fv( v6 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 glColor4ubv( green );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424 glVertex3fv( v1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 glColor4ubv( orange );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 glVertex3fv( v6 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 glColor4ubv( blue );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428 glVertex3fv( v2 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 glColor4ubv( black );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431 glVertex3fv( v5 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432 glColor4ubv( yellow );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
433 glVertex3fv( v4 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 glColor4ubv( purple );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435 glVertex3fv( v7 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437 glColor4ubv( black );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 glVertex3fv( v5 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
439 glColor4ubv( purple );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440 glVertex3fv( v7 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
441 glColor4ubv( orange );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442 glVertex3fv( v6 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 glColor4ubv( yellow );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 glVertex3fv( v4 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
446 glColor4ubv( red );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
447 glVertex3fv( v0 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
448 glColor4ubv( white );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
449 glVertex3fv( v3 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 glColor4ubv( yellow );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
452 glVertex3fv( v4 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
453 glColor4ubv( white );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
454 glVertex3fv( v3 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
455 glColor4ubv( purple );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
456 glVertex3fv( v7 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
457
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
458 glColor4ubv( white );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 glVertex3fv( v3 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460 glColor4ubv( blue );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461 glVertex3fv( v2 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
462 glColor4ubv( orange );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
463 glVertex3fv( v6 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
464
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
465 glColor4ubv( white );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
466 glVertex3fv( v3 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
467 glColor4ubv( orange );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
468 glVertex3fv( v6 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
469 glColor4ubv( purple );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
470 glVertex3fv( v7 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
471
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
472 glColor4ubv( green );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
473 glVertex3fv( v1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
474 glColor4ubv( red );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
475 glVertex3fv( v0 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
476 glColor4ubv( yellow );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
477 glVertex3fv( v4 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
478
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
479 glColor4ubv( green );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
480 glVertex3fv( v1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
481 glColor4ubv( yellow );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
482 glVertex3fv( v4 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
483 glColor4ubv( black );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
484 glVertex3fv( v5 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
485
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
486 glEnd( );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
487
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
488 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
489 * EXERCISE:
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
490 * Draw text telling the user that 'Spc'
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
491 * pauses the rotation and 'Esc' quits.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
492 * Do it using vetors and textured quads.
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 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
496 * 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
497 * 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
498 * 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
499 * 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
500 *
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
501 * Double buffering prevents nasty visual tearing
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
502 * 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
503 * 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
504 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
505 SDL_GL_SwapBuffers( );
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
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
508 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
509 {
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
510 float ratio = (float) width / (float) height;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
511
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
512 /* Our shading model--Gouraud (smooth). */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
513 glShadeModel( GL_SMOOTH );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
514
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
515 /* Culling. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
516 glCullFace( GL_BACK );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
517 glFrontFace( GL_CCW );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
518 glEnable( GL_CULL_FACE );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
519
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
520 /* Set the clear color. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
521 glClearColor( 0, 0, 0, 0 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
522
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
523 /* Setup our viewport. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
524 glViewport( 0, 0, width, height );
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 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
527 * Change to the projection matrix and set
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
528 * our viewing volume.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
529 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
530 glMatrixMode( GL_PROJECTION );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
531 glLoadIdentity( );
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 * EXERCISE:
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
534 * Replace this with a call to glFrustum.
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 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
537 }
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 int main( int argc, char* argv[] )
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
540 {
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
541 /* Information about the current video settings. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
542 const SDL_VideoInfo* info = NULL;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
543 /* Dimensions of our window. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
544 int width = 0;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
545 int height = 0;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
546 /* Color depth in bits of our window. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
547 int bpp = 0;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
548 /* Flags we will pass into SDL_SetVideoMode. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
549 int flags = 0;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
550
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
551 /* First, initialize SDL's video subsystem. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
552 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
553 /* Failed, exit. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
554 fprintf( stderr, "Video initialization failed: %s\n",
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
555 SDL_GetError( ) );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
556 quit_tutorial( 1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
557 }
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
558
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
559 /* Let's get some video information. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
560 info = SDL_GetVideoInfo( );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
561
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
562 if( !info ) {
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
563 /* This should probably never happen. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
564 fprintf( stderr, "Video query failed: %s\n",
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
565 SDL_GetError( ) );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
566 quit_tutorial( 1 );
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
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
569 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
570 * 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
571 * 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
572 * 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
573 * 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
574 * resolution, so this is probably being overly
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
575 * safe. Under Win32, ChangeDisplaySettings
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
576 * can change the bpp.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
577 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
578 width = 640;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
579 height = 480;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
580 bpp = info-&#62;vfmt-&#62;BitsPerPixel;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
581
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
582 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
583 * Now, we want to setup our requested
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
584 * window attributes for our OpenGL window.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
585 * 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
586 * 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
587 * depth buffer.
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 * 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
590 * buffered window. '1' turns on double
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
591 * buffering, '0' turns it off.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
592 *
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
593 * 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
594 * the flags to SDL_SetVideoMode. That does
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
595 * not affect the GL attribute state, only
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
596 * the standard 2D blitting setup.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
597 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
598 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
599 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
600 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
601 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
602 SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
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 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
605 * 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
606 * with an OpenGL window, in a fullscreen
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
607 * video mode.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
608 *
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
609 * EXERCISE:
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
610 * Make starting windowed an option, and
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
611 * handle the resize events properly with
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
612 * glViewport.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
613 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
614 flags = SDL_OPENGL | SDL_FULLSCREEN;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
615
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
616 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
617 * Set the video mode
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
618 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
619 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
620 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
621 * 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
622 * including DISPLAY not being set, the specified
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
623 * resolution not being available, etc.
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 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
626 SDL_GetError( ) );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
627 quit_tutorial( 1 );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
628 }
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
629
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 * 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
632 * double-buffered window for use with OpenGL.
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
633 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
634 setup_opengl( width, height );
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 * 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
638 * 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
639 */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
640 while( 1 ) {
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
641 /* Process incoming events. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
642 process_events( );
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
643 /* Draw the screen. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
644 draw_screen( );
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
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
647 /*
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
648 * EXERCISE:
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
649 * Record timings using SDL_GetTicks() and
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
650 * 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
651 * end.
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 /* Never reached. */
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
655 return 0;
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
656 }</PRE
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
657 ></DIV
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
658 ></DIV
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
659 ></DIV
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
660 ><DIV
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
661 CLASS="NAVFOOTER"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
662 ><HR
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
663 ALIGN="LEFT"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
664 WIDTH="100%"><TABLE
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
665 WIDTH="100%"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
666 BORDER="0"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
667 CELLPADDING="0"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
668 CELLSPACING="0"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
669 ><TR
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
670 ><TD
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
671 WIDTH="33%"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
672 ALIGN="left"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
673 VALIGN="top"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
674 ><A
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
675 HREF="guidevideo.html"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
676 >Prev</A
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 ><TD
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
679 WIDTH="34%"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
680 ALIGN="center"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
681 VALIGN="top"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
682 ><A
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
683 HREF="index.html"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
684 >Home</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="33%"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
688 ALIGN="right"
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="guideinput.html"
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
692 >Next</A
55f1f1b3e27d Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
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693 ></TD
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694 ></TR
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695 ><TR
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696 ><TD
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697 WIDTH="33%"
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698 ALIGN="left"
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699 VALIGN="top"
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700 >Graphics and Video</TD
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701 ><TD
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702 WIDTH="34%"
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703 ALIGN="center"
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704 VALIGN="top"
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705 ><A
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706 HREF="guidevideo.html"
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707 >Up</A
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708 ></TD
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709 ><TD
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710 WIDTH="33%"
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711 ALIGN="right"
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712 VALIGN="top"
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713 >Input handling</TD
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714 ></TR
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715 ></TABLE
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716 ></DIV
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717 ></BODY
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718 ></HTML
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719 >