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annotate test/testdyngl.c @ 2818:4e09acde4333

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author Ryan C. Gordon <icculus@icculus.org>
date Mon, 01 Dec 2008 09:09:31 +0000
parents 204be4fc2726
children 8d0889509afb
rev   line source
839
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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 } while (!done);
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189
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190 SDL_Quit();
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191 return 0;
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192 }
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193
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194 #else /* HAVE_OPENGL */
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195
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196 int
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197 main(int argc, char *argv[])
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198 {
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199 printf("No OpenGL support on this system\n");
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200 return 1;
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201 }
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202
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203 #endif /* HAVE_OPENGL */