annotate test/testdyngl.c @ 2318:0c653886cce7

HandleEvent() returns done each time it is called. If done was set to 0 the program should quit, but because done is not checked until *all* events are handled a following event can reset done to 1 and prevent the program from terminating when told to. I fixed the while loop that handles events to check for the state of done after handling each event. That could leave some events unhandled when the program exits, but it ensures that the program will exit.
author Bob Pendleton <bob@pendleton.com>
date Wed, 20 Feb 2008 23:27:33 +0000
parents c121d94672cb
children 7b53a8401195
rev   line source
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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 :
847
0afe0e38e02c *** empty log message ***
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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 __MACOS__
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23 #define HAVE_OPENGL
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24 #endif
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25
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26 #ifdef HAVE_OPENGL
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27
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28 #include "SDL_opengl.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 void (APIENTRY * glClearColor) (GLfloat, GLfloat, GLfloat, GLfloat);
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57 void (APIENTRY * glClear) (GLbitfield);
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58 void (APIENTRY * glDisable) (GLenum);
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59 void (APIENTRY * glEnable) (GLenum);
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60 void (APIENTRY * glColor4ub) (GLubyte, GLubyte, GLubyte, GLubyte);
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61 void (APIENTRY * glPointSize) (GLfloat);
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62 void (APIENTRY * glHint) (GLenum, GLenum);
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63 void (APIENTRY * glBlendFunc) (GLenum, GLenum);
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64 void (APIENTRY * glMatrixMode) (GLenum);
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65 void (APIENTRY * glLoadIdentity) ();
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66 void (APIENTRY * glOrtho) (GLdouble, GLdouble, GLdouble, GLdouble,
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67 GLdouble, GLdouble);
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68 void (APIENTRY * glRotatef) (GLfloat, GLfloat, GLfloat, GLfloat);
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69 void (APIENTRY * glViewport) (GLint, GLint, GLsizei, GLsizei);
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70 void (APIENTRY * glFogf) (GLenum, GLfloat);
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71 }
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72 glfuncs;
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73
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74 void
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75 init_glfuncs(glfuncs * f)
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76 {
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77 f->glBegin = get_funcaddr("glBegin");
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78 f->glEnd = get_funcaddr("glEnd");
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79 f->glVertex3f = get_funcaddr("glVertex3f");
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80 f->glClearColor = get_funcaddr("glClearColor");
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81 f->glClear = get_funcaddr("glClear");
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82 f->glDisable = get_funcaddr("glDisable");
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83 f->glEnable = get_funcaddr("glEnable");
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84 f->glColor4ub = get_funcaddr("glColor4ub");
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85 f->glPointSize = get_funcaddr("glPointSize");
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86 f->glHint = get_funcaddr("glHint");
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87 f->glBlendFunc = get_funcaddr("glBlendFunc");
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88 f->glMatrixMode = get_funcaddr("glMatrixMode");
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89 f->glLoadIdentity = get_funcaddr("glLoadIdentity");
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90 f->glOrtho = get_funcaddr("glOrtho");
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91 f->glRotatef = get_funcaddr("glRotatef");
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92 f->glViewport = get_funcaddr("glViewport");
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93 f->glFogf = get_funcaddr("glFogf");
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94 }
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95
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96 #define NB_PIXELS 1000
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97
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98 int
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99 main(int argc, char *argv[])
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100 {
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101 glfuncs f;
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102 int i;
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103 SDL_Event event;
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104 int done = 0;
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105 GLfloat pixels[NB_PIXELS * 3];
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106 const char *gl_library = NULL; /* Use the default GL library */
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107
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108 if (argv[1]) {
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109 gl_library = argv[1];
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110 }
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111
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112 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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113 printf("Unable to init SDL : %s\n", SDL_GetError());
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114 return (1);
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115 }
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116
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117 if (SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1) < 0) {
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118 printf("Unable to set GL attribute : %s\n", SDL_GetError());
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119 quit(1);
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120 }
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121
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122 if (SDL_GL_LoadLibrary(gl_library) < 0) {
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123 printf("Unable to dynamically open GL lib : %s\n", SDL_GetError());
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124 quit(1);
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125 }
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126
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127 if (SDL_SetVideoMode(640, 480, 0, SDL_OPENGL) == NULL) {
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128 printf("Unable to open video mode : %s\n", SDL_GetError());
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129 quit(1);
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130 }
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131
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132 /* Set the window manager title bar */
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133 SDL_WM_SetCaption("SDL Dynamic OpenGL Loading Test", "testdyngl");
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134
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135 init_glfuncs(&f);
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136
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137 for (i = 0; i < NB_PIXELS; i++) {
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138 pixels[3 * i] = rand() % 250 - 125;
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139 pixels[3 * i + 1] = rand() % 250 - 125;
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140 pixels[3 * i + 2] = rand() % 250 - 125;
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141 }
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142
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143 f.glViewport(0, 0, 640, 480);
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144
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145 f.glMatrixMode(GL_PROJECTION);
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146 f.glLoadIdentity();
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147 f.glOrtho(-100, 100, -100, 100, -500, 500);
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148
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149 f.glMatrixMode(GL_MODELVIEW);
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150 f.glLoadIdentity();
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151
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152 f.glEnable(GL_DEPTH_TEST);
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153 f.glDisable(GL_TEXTURE_2D);
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154 f.glEnable(GL_BLEND);
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155 f.glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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156
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157 f.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
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158 f.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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159
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160 f.glEnable(GL_POINT_SMOOTH);
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161 f.glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
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162 f.glPointSize(5.0f);
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163 f.glEnable(GL_FOG);
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164 f.glFogf(GL_FOG_START, -500);
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165 f.glFogf(GL_FOG_END, 500);
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166 f.glFogf(GL_FOG_DENSITY, 0.005);
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167
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168 do {
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169 f.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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170
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171 f.glRotatef(2.0, 1.0, 1.0, 1.0);
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172 f.glRotatef(1.0, 0.0, 1.0, 1.0);
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173
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174 f.glColor4ub(255, 255, 255, 255);
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175 f.glBegin(GL_POINTS);
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176 for (i = 0; i < NB_PIXELS; i++) {
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177 f.glVertex3f(pixels[3 * i], pixels[3 * i + 1], pixels[3 * i + 2]);
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178 }
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179 f.glEnd();
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180 SDL_GL_SwapBuffers();
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181
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182 while (SDL_PollEvent(&event)) {
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183 if (event.type & SDL_KEYDOWN)
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184 done = 1;
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185 }
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186
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187 SDL_Delay(20);
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188 }
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189 while (!done);
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190
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191 SDL_Quit();
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192 return 0;
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193 }
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194
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195 #else /* HAVE_OPENGL */
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196
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197 int
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198 main(int argc, char *argv[])
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199 {
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200 printf("No OpenGL support on this system\n");
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201 return 1;
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202 }
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203
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204 #endif /* HAVE_OPENGL */