annotate test/testdyngl.c @ 3877:81f66f258d77 SDL-1.2

Fixed bug #281 ------- Comment #2 From Christian Walther 2006-07-23 07:37 [reply] ------- Wow, that was an interesting bug to chase. It was a timing issue: it seems that for some reason, a certain time must pass between ShowMenuBar() being called in QZ_UnsetVideoMode() and the application quitting. Before rev. 1885, this delay was provided by the slow hand-coded fade. With the asynchronous Core Graphics fading introduced in rev. 1885, that delay was no longer present (most of the time) and the bug became apparent. Adding an SDL_Delay(100) somewhere between ShowMenuBar() and the end of QZ_VideoQuit() lowered the frequency of the bug appearing from "almost every time" to "very rarely" here. However, there is another solution: doing the ShowMenuBar() before releasing the captured display instead of afterwards. Apparently, no delay is necessary in that case, and it looks nicer to me anyway because it is the reverse order of the way things are set up in the beginning: capture display - set video mode - hide menu bar - ... - show menu bar - reset video mode - release captured display. So, this is what the attached patch does. In addition, I've taken the liberty of - removing some unused code that I forgot to remove in rev. 1885, - fixing two warnings about undeclared functions in SDL_QuartzVideo.m by including OpenGL.h (whose name is a bit misleading - it only declares CGL stuff, so there's no interference with SDL_opengl.h).
author Sam Lantinga <slouken@libsdl.org>
date Sun, 24 Sep 2006 01:27:40 +0000
parents 871090feb7ad
children 782fd950bd46 c121d94672cb
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 :
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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 quit(int rc)
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32 {
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33 SDL_Quit();
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34 exit(rc);
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35 }
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36
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37 void* get_funcaddr(const char* p)
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38 {
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39 void* f=SDL_GL_GetProcAddress(p);
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40 if (f)
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41 {
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42 return f;
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43 }
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44 else
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45 {
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46 printf("Unable to get function pointer for %s\n",p);
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47 quit(1);
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48 }
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49 return NULL;
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50 }
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51
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52 typedef struct
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53 {
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54 void(APIENTRY*glBegin)(GLenum);
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55 void(APIENTRY*glEnd)();
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56 void(APIENTRY*glVertex3f)(GLfloat, GLfloat, GLfloat);
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57 void(APIENTRY*glClearColor)(GLfloat, GLfloat, GLfloat, GLfloat);
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58 void(APIENTRY*glClear)(GLbitfield);
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59 void(APIENTRY*glDisable)(GLenum);
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60 void(APIENTRY*glEnable)(GLenum);
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61 void(APIENTRY*glColor4ub)(GLubyte,GLubyte,GLubyte,GLubyte);
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62 void(APIENTRY*glPointSize)(GLfloat);
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63 void(APIENTRY*glHint)(GLenum,GLenum);
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64 void(APIENTRY*glBlendFunc)(GLenum,GLenum);
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65 void(APIENTRY*glMatrixMode)(GLenum);
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66 void(APIENTRY*glLoadIdentity)();
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67 void(APIENTRY*glOrtho)(GLdouble,GLdouble,GLdouble,GLdouble,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 init_glfuncs(glfuncs* f)
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75 {
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76 f->glBegin=get_funcaddr("glBegin");
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77 f->glEnd=get_funcaddr("glEnd");
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78 f->glVertex3f=get_funcaddr("glVertex3f");
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79 f->glClearColor=get_funcaddr("glClearColor");
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80 f->glClear=get_funcaddr("glClear");
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81 f->glDisable=get_funcaddr("glDisable");
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82 f->glEnable=get_funcaddr("glEnable");
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83 f->glColor4ub=get_funcaddr("glColor4ub");
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84 f->glPointSize=get_funcaddr("glPointSize");
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85 f->glHint=get_funcaddr("glHint");
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86 f->glBlendFunc=get_funcaddr("glBlendFunc");
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87 f->glMatrixMode=get_funcaddr("glMatrixMode");
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88 f->glLoadIdentity=get_funcaddr("glLoadIdentity");
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89 f->glOrtho=get_funcaddr("glOrtho");
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90 f->glRotatef=get_funcaddr("glRotatef");
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91 f->glViewport=get_funcaddr("glViewport");
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92 f->glFogf=get_funcaddr("glFogf");
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93 }
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94
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95 #define NB_PIXELS 1000
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96
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97 int main(int argc,char *argv[])
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98 {
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99 glfuncs f;
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100 int i;
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101 SDL_Event event;
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102 int done=0;
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103 GLfloat pixels[NB_PIXELS*3];
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104 const char *gl_library = NULL; /* Use the default GL library */
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105
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106 if (argv[1]) {
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107 gl_library = argv[1];
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108 }
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109
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110 if (SDL_Init(SDL_INIT_VIDEO)<0)
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111 {
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112 printf("Unable to init SDL : %s\n",SDL_GetError());
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113 return(1);
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114 }
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115
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116 if (SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,1)<0)
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117 {
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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 {
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124 printf("Unable to dynamically open GL lib : %s\n",SDL_GetError());
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125 quit(1);
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126 }
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127
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128 if (SDL_SetVideoMode(640,480,0,SDL_OPENGL)==NULL)
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129 {
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130 printf("Unable to open video mode : %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 /* Set the window manager title bar */
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135 SDL_WM_SetCaption( "SDL Dynamic OpenGL Loading Test", "testdyngl" );
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136
839
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137 init_glfuncs(&f);
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138
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139 for(i=0;i<NB_PIXELS;i++)
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140 {
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141 pixels[3*i]=rand()%250-125;
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142 pixels[3*i+1]=rand()%250-125;
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143 pixels[3*i+2]=rand()%250-125;
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144 }
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145
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146 f.glViewport(0,0,640,480);
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147
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148 f.glMatrixMode(GL_PROJECTION);
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149 f.glLoadIdentity();
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150 f.glOrtho(-100,100,-100,100,-500,500);
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151
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152 f.glMatrixMode(GL_MODELVIEW);
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153 f.glLoadIdentity();
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154
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155 f.glEnable(GL_DEPTH_TEST);
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156 f.glDisable(GL_TEXTURE_2D);
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157 f.glEnable(GL_BLEND);
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158 f.glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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159
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160 f.glClearColor(0.0f,0.0f,0.0f,0.0f);
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161 f.glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
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162
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163 f.glEnable(GL_POINT_SMOOTH);
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164 f.glHint(GL_POINT_SMOOTH_HINT,GL_NICEST);
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165 f.glPointSize(5.0f);
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166 f.glEnable(GL_FOG);
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167 f.glFogf(GL_FOG_START,-500);
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168 f.glFogf(GL_FOG_END,500);
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169 f.glFogf(GL_FOG_DENSITY,0.005);
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170
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171 do
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172 {
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173 f.glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
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174
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175 f.glRotatef(2.0,1.0,1.0,1.0);
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176 f.glRotatef(1.0,0.0,1.0,1.0);
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177
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178 f.glColor4ub(255,255,255,255);
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179 f.glBegin(GL_POINTS);
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180 for(i=0;i<NB_PIXELS;i++)
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181 {
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182 f.glVertex3f(pixels[3*i],pixels[3*i+1],pixels[3*i+2]);
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183 }
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184 f.glEnd();
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185 SDL_GL_SwapBuffers();
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186
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187 while(SDL_PollEvent(&event))
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188 {
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189 if(event.type & SDL_KEYDOWN)
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190 done=1;
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191 }
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192
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193 SDL_Delay(20);
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194 }
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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 main(int argc, char *argv[])
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204 {
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205 printf("No OpenGL support on this system\n");
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206 return 1;
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207 }
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208
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209 #endif /* HAVE_OPENGL */