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annotate test/testdyngl.c @ 4639:f5cd4b6231ba

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Added Test Directory. Touch input works in touchSimp for wacom bamboo fun on Ubuntu linux. Not yet integrated into library. Should support other touch devices and other linux distros, but not tested on anything else.
author Jim Grandpre <jim.tla@gmail.com>
date Mon, 24 May 2010 23:44:24 -0400
parents 8d0889509afb
children
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);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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46 quit(1);
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47 }
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48 return NULL;
839
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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);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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 const GLubyte* (APIENTRY * glGetString) (GLenum);
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72 }
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73 glfuncs;
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74
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75 void
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76 init_glfuncs(glfuncs * f)
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77 {
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78 f->glBegin = get_funcaddr("glBegin");
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79 f->glEnd = get_funcaddr("glEnd");
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80 f->glVertex3f = get_funcaddr("glVertex3f");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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81 f->glClearColor = get_funcaddr("glClearColor");
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82 f->glClear = get_funcaddr("glClear");
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83 f->glDisable = get_funcaddr("glDisable");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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84 f->glEnable = get_funcaddr("glEnable");
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85 f->glColor4ub = get_funcaddr("glColor4ub");
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86 f->glPointSize = get_funcaddr("glPointSize");
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87 f->glHint = get_funcaddr("glHint");
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88 f->glBlendFunc = get_funcaddr("glBlendFunc");
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89 f->glMatrixMode = get_funcaddr("glMatrixMode");
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90 f->glLoadIdentity = get_funcaddr("glLoadIdentity");
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91 f->glOrtho = get_funcaddr("glOrtho");
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92 f->glRotatef = get_funcaddr("glRotatef");
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93 f->glViewport = get_funcaddr("glViewport");
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94 f->glFogf = get_funcaddr("glFogf");
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95 f->glGetString = get_funcaddr("glGetString");
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96
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97 printf("Vendor : %s\n", f->glGetString(GL_VENDOR));
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98 printf("Renderer : %s\n", f->glGetString(GL_RENDERER));
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99 printf("Version : %s\n", f->glGetString(GL_VERSION));
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100 printf("Extensions : %s\n", f->glGetString(GL_EXTENSIONS));
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101 }
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102
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103 #define NB_PIXELS 1000
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104
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105 int
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106 main(int argc, char *argv[])
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107 {
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108 glfuncs f;
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109 int i;
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110 SDL_Event event;
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111 int done = 0;
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112 GLfloat pixels[NB_PIXELS * 3];
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113 const char *gl_library = NULL; /* Use the default GL library */
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114
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115 if (argv[1]) {
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116 gl_library = argv[1];
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117 }
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118
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119 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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120 printf("Unable to init SDL : %s\n", SDL_GetError());
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121 return (1);
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122 }
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123
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124 if (SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1) < 0) {
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125 printf("Unable to set GL attribute : %s\n", SDL_GetError());
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126 quit(1);
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127 }
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128
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129 if (SDL_GL_LoadLibrary(gl_library) < 0) {
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130 printf("Unable to dynamically open GL lib : %s\n", SDL_GetError());
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131 quit(1);
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132 }
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133
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134 if (SDL_SetVideoMode(640, 480, 0, SDL_OPENGL) == NULL) {
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135 printf("Unable to open video mode : %s\n", SDL_GetError());
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136 quit(1);
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137 }
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138
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139 /* Set the window manager title bar */
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140 SDL_WM_SetCaption("SDL Dynamic OpenGL Loading Test", "testdyngl");
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141
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142 init_glfuncs(&f);
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4ab6d1fd028f Date: Sat, 26 Jun 2004 14:58:42 +0300
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143
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144 for (i = 0; i < NB_PIXELS; i++) {
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145 pixels[3 * i] = rand() % 250 - 125;
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146 pixels[3 * i + 1] = rand() % 250 - 125;
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147 pixels[3 * i + 2] = rand() % 250 - 125;
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148 }
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149
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150 f.glViewport(0, 0, 640, 480);
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151
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152 f.glMatrixMode(GL_PROJECTION);
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153 f.glLoadIdentity();
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154 f.glOrtho(-100, 100, -100, 100, -500, 500);
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155
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156 f.glMatrixMode(GL_MODELVIEW);
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157 f.glLoadIdentity();
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158
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159 f.glEnable(GL_DEPTH_TEST);
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160 f.glDisable(GL_TEXTURE_2D);
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161 f.glEnable(GL_BLEND);
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162 f.glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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163
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164 f.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
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165 f.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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166
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167 f.glEnable(GL_POINT_SMOOTH);
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168 f.glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
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169 f.glPointSize(5.0f);
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170 f.glEnable(GL_FOG);
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171 f.glFogf(GL_FOG_START, -500);
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172 f.glFogf(GL_FOG_END, 500);
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173 f.glFogf(GL_FOG_DENSITY, 0.005);
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174
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175 do {
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176 f.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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177
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178 f.glRotatef(2.0, 1.0, 1.0, 1.0);
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179 f.glRotatef(1.0, 0.0, 1.0, 1.0);
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180
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181 f.glColor4ub(255, 255, 255, 255);
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182 f.glBegin(GL_POINTS);
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183 for (i = 0; i < NB_PIXELS; i++) {
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184 f.glVertex3f(pixels[3 * i], pixels[3 * i + 1], pixels[3 * i + 2]);
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185 }
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186 f.glEnd();
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187 SDL_GL_SwapBuffers();
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188
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189 while (SDL_PollEvent(&event)) {
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190 if (event.type == SDL_KEYDOWN)
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191 done = 1;
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192 }
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193
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194 SDL_Delay(20);
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195 } while (!done);
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196
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197 SDL_Quit();
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198 return 0;
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199 }
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200
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201 #else /* HAVE_OPENGL */
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202
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203 int
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204 main(int argc, char *argv[])
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205 {
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206 printf("No OpenGL support on this system\n");
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207 return 1;
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208 }
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209
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210 #endif /* HAVE_OPENGL */