1 /* Copyright © 2013, Intel Corporation
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to deal
5 * in the Software without restriction, including without limitation the rights
6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 * copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 /* Perform some simple drawing via OpenGL as follows:
24 * 1. Using GLX to construct an OpenGL context
25 * 2. By using dlopen to dynamically load libGL.so
26 * 3. By using dlsym to lookup OpenGL functions
29 #define GL_GLEXT_PROTOTYPES
39 void (*my_glClear) (GLbitfield);
40 void (*my_glClearColor) (GLclampf, GLclampf, GLclampf, GLclampf);
41 void (*my_glLoadIdentity) (void);
42 void (*my_glMatrixMode) (GLenum);
43 void (*my_glOrtho) (GLdouble, GLdouble, GLdouble, GLdouble, GLdouble, GLdouble);
44 void (*my_glViewport) (GLint, GLint, GLsizei, GLsizei);
45 XVisualInfo * (*my_glXChooseVisual) (Display *, int, int *);
46 GLXContext (*my_glXCreateContext) (Display *, XVisualInfo *, GLXContext, Bool);
47 void (*my_glXDestroyContext) (Display *, GLXContext);
48 Bool (*my_glXMakeCurrent) (Display *, GLXDrawable, GLXContext);
49 void (*my_glXSwapBuffers) (Display *, GLXDrawable);
51 #define HANDLE_EVENTS_GL_PREFIX my_
52 #include "handle-events.c"
55 resolve_symbols (void)
60 gl_handle = dlopen ("libGL.so", RTLD_LAZY);
61 if (gl_handle == NULL) {
62 fprintf (stderr, "Error: Failed to open libGL.so\n");
69 my_glClear = dlsym (gl_handle, "glClear");
72 fprintf (stderr, "Failed to dlsym glClear: %s\n", error);
76 my_glClearColor = dlsym (gl_handle, "glClearColor");
79 fprintf (stderr, "Failed to dlsym glClearColor: %s\n", error);
83 my_glLoadIdentity = dlsym (gl_handle, "glLoadIdentity");
86 fprintf (stderr, "Failed to dlsym glLoadIdentity: %s\n", error);
90 my_glMatrixMode = dlsym (gl_handle, "glMatrixMode");
93 fprintf (stderr, "Failed to dlsym glMatrixMode: %s\n", error);
97 my_glOrtho = dlsym (gl_handle, "glOrtho");
100 fprintf (stderr, "Failed to dlsym glOrtho: %s\n", error);
104 my_glViewport = dlsym (gl_handle, "glViewport");
107 fprintf (stderr, "Failed to dlsym glViewport: %s\n", error);
111 my_glXChooseVisual = dlsym (gl_handle, "glXChooseVisual");
114 fprintf (stderr, "Failed to dlsym glXChooseVisual: %s\n", error);
118 my_glXCreateContext = dlsym (gl_handle, "glXCreateContext");
121 fprintf (stderr, "Failed to dlsym glXCreateContext: %s\n", error);
125 my_glXDestroyContext = dlsym (gl_handle, "glXDestroyContext");
128 fprintf (stderr, "Failed to dlsym glXDestroyContext: %s\n", error);
132 my_glXMakeCurrent = dlsym (gl_handle, "glXMakeCurrent");
135 fprintf (stderr, "Failed to dlsym glXMakeCurrent: %s\n", error);
139 my_glXSwapBuffers = dlsym (gl_handle, "glXSwapBuffers");
142 fprintf (stderr, "Failed to dlsym glXSwapBuffers: %s\n", error);
153 XVisualInfo *visual_info;
157 dpy = util_x11_init_display ();
159 create_context (dpy, &ctx, &visual_info);
161 window = util_x11_init_window (dpy, visual_info);
163 handle_events (dpy, ctx, window);
165 util_x11_fini_window (dpy, window);
167 util_x11_fini_display (dpy);