annotate test/testdyngles.c @ 2848:8a3aa505ecba

Comment cleanup.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 07 Dec 2008 07:16:40 +0000
parents f55c87ae336b
children 0b6f51c29267
rev   line source
2765
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1 /*
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2 * Small SDL example to demonstrate dynamically loading
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3 * OpenGL lib and functions
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4 *
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5 * (FYI it was supposed to look like snow in the wind or something...)
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6 *
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7 * Compile with :
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8 * gcc testdyngl.c `sdl-config --libs --cflags` -o testdyngl -DHAVE_OPENGL
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9 *
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10 * You can specify a different OpenGL lib on the command line, i.e. :
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11 * ./testdyngl /usr/X11R6/lib/libGL.so.1.2
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12 * or
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13 * ./testdyngl /usr/lib/libGL.so.1.0.4496
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14 *
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15 */
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16
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17 #include <stdio.h>
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18 #include <stdlib.h>
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19
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20 #include "SDL.h"
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21
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22 #ifdef __IPHONEOS__
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23 #define HAVE_OPENGLES
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24 #endif
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25
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26 #ifdef HAVE_OPENGLES
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27
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28 #include "SDL_opengles.h"
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29
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30 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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31 static void
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32 quit(int rc)
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33 {
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34 SDL_Quit();
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35 exit(rc);
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36 }
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37
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38 void *
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39 get_funcaddr(const char *p)
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40 {
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41 void *f = SDL_GL_GetProcAddress(p);
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42 if (f) {
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43 return f;
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44 } else {
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45 printf("Unable to get function pointer for %s\n", p);
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46 quit(1);
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47 }
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48 return NULL;
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49 }
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50
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51 typedef struct
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52 {
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53 //void (APIENTRY * glBegin) (GLenum);
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54 //void (APIENTRY * glEnd) ();
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55 //void (APIENTRY * glVertex3f) (GLfloat, GLfloat, GLfloat);
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56
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57 void (APIENTRY * glEnableClientState) (GLenum array);
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58 void (APIENTRY * glVertexPointer) (GLint size, GLenum type,
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59 GLsizei stride,
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60 const GLvoid * pointer);
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61 void (APIENTRY * glDrawArrays) (GLenum mode, GLint first, GLsizei count);
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62
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63
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64 void (APIENTRY * glClearColor) (GLfloat, GLfloat, GLfloat, GLfloat);
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65 void (APIENTRY * glClear) (GLbitfield);
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66 void (APIENTRY * glDisable) (GLenum);
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67 void (APIENTRY * glEnable) (GLenum);
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68 void (APIENTRY * glColor4ub) (GLubyte, GLubyte, GLubyte, GLubyte);
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69 void (APIENTRY * glPointSize) (GLfloat);
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70 void (APIENTRY * glHint) (GLenum, GLenum);
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71 void (APIENTRY * glBlendFunc) (GLenum, GLenum);
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72 void (APIENTRY * glMatrixMode) (GLenum);
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73 void (APIENTRY * glLoadIdentity) ();
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74 void (APIENTRY * glOrthof) (GLfloat, GLfloat, GLfloat, GLfloat,
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75 GLfloat, GLfloat);
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76 void (APIENTRY * glRotatef) (GLfloat, GLfloat, GLfloat, GLfloat);
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77 void (APIENTRY * glViewport) (GLint, GLint, GLsizei, GLsizei);
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78 void (APIENTRY * glFogf) (GLenum, GLfloat);
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79 }
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80 glfuncs;
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81
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82 void
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83 init_glfuncs(glfuncs * f)
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84 {
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85 f->glEnableClientState = get_funcaddr("glEnableClientState");
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86 f->glVertexPointer = get_funcaddr("glVertexPointer");
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87 f->glDrawArrays = get_funcaddr("glDrawArrays");
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88 f->glClearColor = get_funcaddr("glClearColor");
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89 f->glClear = get_funcaddr("glClear");
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90 f->glDisable = get_funcaddr("glDisable");
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91 f->glEnable = get_funcaddr("glEnable");
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92 f->glColor4ub = get_funcaddr("glColor4ub");
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93 f->glPointSize = get_funcaddr("glPointSize");
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94 f->glHint = get_funcaddr("glHint");
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95 f->glBlendFunc = get_funcaddr("glBlendFunc");
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96 f->glMatrixMode = get_funcaddr("glMatrixMode");
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97 f->glLoadIdentity = get_funcaddr("glLoadIdentity");
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98 f->glOrthof = get_funcaddr("glOrthof");
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99 f->glRotatef = get_funcaddr("glRotatef");
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100 f->glViewport = get_funcaddr("glViewport");
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101 f->glFogf = get_funcaddr("glFogf");
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102 }
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103
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104 #define NB_PIXELS 1000
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105
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106 int
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107 main(int argc, char *argv[])
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108 {
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109 glfuncs f;
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110 int i;
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111 SDL_Event event;
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112 int done = 0;
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113 GLfloat pixels[NB_PIXELS * 3];
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114 const char *gl_library = NULL; /* Use the default GL library */
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115
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116 int video_w, video_h;
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117
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118 /* you may want to change these according to the platform */
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119 video_w = 320;
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120 video_h = 480;
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121
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122 if (argv[1]) {
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123 gl_library = argv[1];
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124 }
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125
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126 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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127 printf("Unable to init SDL : %s\n", SDL_GetError());
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128 return (1);
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129 }
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130
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131 if (SDL_GL_LoadLibrary(gl_library) < 0) {
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132 printf("Unable to dynamically open GL lib : %s\n", SDL_GetError());
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133 quit(1);
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134 }
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135
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136 if (SDL_SetVideoMode(video_h, video_w, 0, SDL_OPENGL) == NULL) {
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137 printf("Unable to open video mode : %s\n", SDL_GetError());
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138 quit(1);
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139 }
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140
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141 /* Set the window manager title bar */
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142 SDL_WM_SetCaption("SDL Dynamic OpenGL Loading Test", "testdyngl");
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143
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144 init_glfuncs(&f);
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145
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146 for (i = 0; i < NB_PIXELS; i++) {
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147 pixels[3 * i] = rand() % 250 - 125;
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148 pixels[3 * i + 1] = rand() % 250 - 125;
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149 pixels[3 * i + 2] = rand() % 250 - 125;
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150 }
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151
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152 f.glViewport(0, 0, video_w, video_h);
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153
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154 f.glMatrixMode(GL_PROJECTION);
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155 f.glLoadIdentity();
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156 f.glOrthof(-100, 100, -100, 100, -500, 500);
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157
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158 f.glMatrixMode(GL_MODELVIEW);
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159 f.glLoadIdentity();
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160
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161 f.glEnable(GL_DEPTH_TEST);
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162 f.glDisable(GL_TEXTURE_2D);
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163 f.glEnable(GL_BLEND);
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164 f.glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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165
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166 f.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
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167 f.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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168
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169 f.glEnable(GL_POINT_SMOOTH);
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170 f.glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
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171 f.glPointSize(5.0f);
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172 f.glEnable(GL_FOG);
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173 f.glFogf(GL_FOG_START, -500);
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174 f.glFogf(GL_FOG_END, 500);
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175 f.glFogf(GL_FOG_DENSITY, 0.005);
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176
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177 do {
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178 f.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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179
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180 f.glRotatef(2.0, 1.0, 1.0, 1.0);
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181 f.glRotatef(1.0, 0.0, 1.0, 1.0);
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182
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183 f.glColor4ub(255, 255, 255, 255);
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184
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185 f.glEnableClientState(GL_VERTEX_ARRAY);
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186 f.glVertexPointer(3, GL_FLOAT, 0, pixels);
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187 f.glDrawArrays(GL_POINTS, 0, NB_PIXELS);
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188
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189 SDL_GL_SwapBuffers();
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190
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191 while (SDL_PollEvent(&event)) {
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192 if (event.type == SDL_KEYDOWN)
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193 done = 1;
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194 }
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195
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196 SDL_Delay(20);
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197 }
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198 while (!done);
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199
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200 SDL_Quit();
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201 return 0;
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202 }
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203
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204 #else /* HAVE_OPENGLES */
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205
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206 int
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207 main(int argc, char *argv[])
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208 {
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209 printf("No OpenGL support on this system\n");
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210 return 1;
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211 }
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212
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213 #endif /* HAVE_OPENGLES */