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annotate test/testdyngl.c @ 855:aa4ac9e65d92

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I noticed MacOSX SDL sets up working directory to parent of executable. On BeOS is should setup it the same way, but it only does when Tracker wasn't restarted. I checked code and it looks like a hack to me :( It looks for env variable and than comapres it to default when OpenTracker was started after boot, and wasn't restarted. That's probably ok, for that exact case. Unfortunetly that variable isn't always like that. For example, after Tracker crashes and is restarted, env variable most probably is different (depends on how Tracker was restarted, by what application, etc... for example: i have launcher application from which i can restart Tracker, and after that nev variable points to that application's directory, not Tracker's).
author Sam Lantinga <slouken@libsdl.org>
date Tue, 24 Feb 2004 18:58:40 +0000
parents 0afe0e38e02c
children 9f6ad2286011
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 HAVE_OPENGL
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23
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24 #include "SDL_opengl.h"
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25
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26 void* get_funcaddr(const char* p)
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27 {
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28 void* f=SDL_GL_GetProcAddress(p);
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29 if (f)
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30 {
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31 return f;
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32 }
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33 else
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34 {
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35 printf("Unable to get function pointer for %s\n",p);
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36 exit(1);
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37 }
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38 }
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39
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40 typedef struct
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41 {
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42 void(*glBegin)(GLenum);
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43 void(*glEnd)();
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44 void(*glVertex3f)(GLfloat, GLfloat, GLfloat);
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45 void(*glClearColor)(GLfloat, GLfloat, GLfloat, GLfloat);
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46 void(*glClear)(GLbitfield);
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47 void(*glDisable)(GLenum);
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48 void(*glEnable)(GLenum);
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49 void(*glColor4ub)(GLubyte,GLubyte,GLubyte,GLubyte);
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50 void(*glPointSize)(GLfloat);
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51 void(*glHint)(GLenum,GLenum);
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52 void(*glBlendFunc)(GLenum,GLenum);
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53 void(*glMatrixMode)(GLenum);
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54 void(*glLoadIdentity)();
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55 void(*glOrtho)(GLdouble,GLdouble,GLdouble,GLdouble,GLdouble,GLdouble);
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56 void(*glRotatef)(GLfloat,GLfloat,GLfloat,GLfloat);
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57 void(*glViewport)(GLint,GLint,GLsizei,GLsizei);
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58 void(*glFogf)(GLenum,GLfloat);
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59 }
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60 glfuncs;
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61
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62 void init_glfuncs(glfuncs* f)
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63 {
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64 f->glBegin=get_funcaddr("glBegin");
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65 f->glEnd=get_funcaddr("glEnd");
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66 f->glVertex3f=get_funcaddr("glVertex3f");
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67 f->glClearColor=get_funcaddr("glClearColor");
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68 f->glClear=get_funcaddr("glClear");
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69 f->glDisable=get_funcaddr("glDisable");
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70 f->glEnable=get_funcaddr("glEnable");
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71 f->glColor4ub=get_funcaddr("glColor4ub");
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72 f->glPointSize=get_funcaddr("glPointSize");
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73 f->glHint=get_funcaddr("glHint");
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74 f->glBlendFunc=get_funcaddr("glBlendFunc");
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75 f->glMatrixMode=get_funcaddr("glMatrixMode");
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76 f->glLoadIdentity=get_funcaddr("glLoadIdentity");
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77 f->glOrtho=get_funcaddr("glOrtho");
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78 f->glRotatef=get_funcaddr("glRotatef");
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79 f->glViewport=get_funcaddr("glViewport");
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80 f->glFogf=get_funcaddr("glFogf");
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81 }
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82
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83 #define NB_PIXELS 1000
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84
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85 int main(int argc,char *argv[])
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86 {
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87 glfuncs f;
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88 int i;
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89 SDL_Event event;
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90 int done=0;
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91 GLfloat pixels[NB_PIXELS*3];
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92 #ifdef _WIN32
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93 char *gl_library = "OpenGL32.DLL";
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94 #else
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95 char *gl_library = "libGL.so.1";
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96 #endif
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97
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98 if (argv[1]) {
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99 gl_library = argv[1];
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100 }
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101
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102 if (SDL_Init(SDL_INIT_VIDEO)<0)
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103 {
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104 printf("Unable to init SDL : %s\n",SDL_GetError());
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105 exit(1);
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106 }
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107
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108 if (SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,1)<0)
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109 {
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110 printf("Unable to set GL attribute : %s\n",SDL_GetError());
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111 exit(1);
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112 }
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113
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114 if (SDL_GL_LoadLibrary(gl_library)<0)
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115 {
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116 printf("Unable to dynamically open GL lib : %s\n",SDL_GetError());
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117 exit(1);
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118 }
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119
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120 if (SDL_SetVideoMode(640,480,0,SDL_OPENGL)==NULL)
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121 {
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122 printf("Unable to open video mode : %s\n",SDL_GetError());
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123 exit(1);
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124 }
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125
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126 init_glfuncs(&f);
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127
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128 for(i=0;i<NB_PIXELS;i++)
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129 {
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130 pixels[3*i]=rand()%250-125;
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131 pixels[3*i+1]=rand()%250-125;
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132 pixels[3*i+2]=rand()%250-125;
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133 }
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134
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135 f.glViewport(0,0,640,480);
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136
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137 f.glMatrixMode(GL_PROJECTION);
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138 f.glLoadIdentity();
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139 f.glOrtho(-100,100,-100,100,-500,500);
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140
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141 f.glMatrixMode(GL_MODELVIEW);
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142 f.glLoadIdentity();
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143
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144 f.glEnable(GL_DEPTH_TEST);
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145 f.glDisable(GL_TEXTURE_2D);
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146 f.glEnable(GL_BLEND);
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147 f.glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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148
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149 f.glClearColor(0.0f,0.0f,0.0f,0.0f);
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150 f.glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
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151
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152 f.glEnable(GL_POINT_SMOOTH);
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153 f.glHint(GL_POINT_SMOOTH_HINT,GL_NICEST);
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154 f.glPointSize(5.0f);
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155 f.glEnable(GL_FOG);
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156 f.glFogf(GL_FOG_START,-500);
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157 f.glFogf(GL_FOG_END,500);
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158 f.glFogf(GL_FOG_DENSITY,0.005);
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159
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160 do
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161 {
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162 f.glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
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163
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164 f.glRotatef(2.0,1.0,1.0,1.0);
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165 f.glRotatef(1.0,0.0,1.0,1.0);
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166
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167 f.glColor4ub(255,255,255,255);
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168 f.glBegin(GL_POINTS);
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169 for(i=0;i<NB_PIXELS;i++)
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170 {
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171 f.glVertex3f(pixels[3*i],pixels[3*i+1],pixels[3*i+2]);
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172 }
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173 f.glEnd();
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174 SDL_GL_SwapBuffers();
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175
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176 while(SDL_PollEvent(&event))
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177 {
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178 if(event.type & SDL_KEYDOWN)
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179 done=1;
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180 }
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181
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182 SDL_Delay(20);
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183 }
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184 while(!done);
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185
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186 SDL_Quit();
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187 return 0;
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188 }
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189
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190 #else /* HAVE_OPENGL */
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191
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192 int main(int argc, char *argv[])
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193 {
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194 printf("No OpenGL support on this system\n");
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195 return 1;
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196 }
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197
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198 #endif /* HAVE_OPENGL */