Mercurial > sdl-ios-xcode

annotate test/testdyngl.c @ 4355:9b464226e541 SDL-1.2

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Fixed bug #855 Ludwig Nussel 2009-10-18 06:31:52 PDT an mprotect call was added to fix bug 528. However that results in a buffer that allows writing and code execution. Ie the no-execute security features of modern operating systems are defeated this way. Two mprotect calls are needed. One to make the buffer executable but not writeable when done and another one to make the buffer writeable again if the content needs to be changed.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Oct 2009 17:31:37 +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
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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 */