Mercurial > sdl-ios-xcode
annotate test/testdyngl.c @ 3474:1edb86163d62
Of COURSE that trick wouldn't work on all renderers. Fall back to something for now, hopefully figure out a better way to do this later.
If we have to, we can use vertical line and horizontal line textures for vertical and horizontal lines, and then create custom textures for diagonal lines and software render those. It's terrible, but at least it would be pixel perfect.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 21 Nov 2009 07:22:59 +0000 |
parents | 8d0889509afb |
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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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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); |
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46 quit(1); |
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47 } |
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48 return NULL; |
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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); |
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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); |
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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); |
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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"); |
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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"); |
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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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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 */ |