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annotate test/testdyngl.c @ 4216:5b99971a27b4 SDL-1.2

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Fixed bug #698 Hans de Goede 2009-02-13 01:10:52 PST Since the new "glitch free" version of pulseaudio (used in Fedora 10 amongst others), the sound of SDL using apps (like a simple playmus call) has been crackling. While looking in to fixing this I noticed that the current pulseaudio code in SDL uses pa_simple. However pa_simple uses a thread to pump pulseaudio events and ipc, given that SDL already has its own thread for audio handling this is clearly suboptimal, leading to unnecessary context switching IPC, etc. Also pa_simple does not allow one to implement the WaitAudio() callback for SDL audiodrivers properly. Given that my work is mostly a rewrite (although some original pieces remain) I'm attaching the new .c and .h file, as that is easier to review then the huge diff. Let me know if you also want the diff. This new version has the following features: -no longer use an additional thread next to the SDL sound thread -do not crackle with glitch free audio -when used with a newer pulse, which does glitch free audio, the total latency is the same as with the alsa driver -proper WaitAudio() implementation, saving another mixlen worth of latency -adds a WaitDone() implementation This patch has been written in consultancy with Lennart Poetering (the pulseaudio author) and has been reviewed by him for correct use of the pa API.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 21 Sep 2009 09:27:08 +0000
parents 871090feb7ad
children 782fd950bd46 c121d94672cb
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 :
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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 */