3 * Copyright (c) 2001 César Blecua Udías All Rights Reserved.
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included
13 * in all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * CESAR BLECUA UDIAS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
19 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
20 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
27 #include "extensions.hxx"
28 #include <simgear/debug/logstream.hxx>
33 bool SGSearchExtensionsString(const char *extString, const char *extName) {
34 // Returns GL_TRUE if the *extName string appears in the *extString string,
35 // surrounded by white spaces, or GL_FALSE otherwise.
40 if ((extString == NULL) || (extName == NULL))
43 extNameLen = strlen(extName);
50 if ((extNameLen == n) && (strncmp(extName, p, n) == 0))
59 bool SGIsOpenGLExtensionSupported(const char *extName) {
60 // Returns GL_TRUE if the OpenGL Extension whose name is *extName
61 // is supported by the system, or GL_FALSE otherwise.
63 // The *extName string must follow the OpenGL extensions naming scheme
64 // (ie: "GL_type_extension", like GL_EXT_convolution)
66 return SGSearchExtensionsString((const char *)glGetString(GL_EXTENSIONS),extName);
71 #include <CoreFoundation/CoreFoundation.h>
73 void* macosxGetGLProcAddress(const char *func) {
75 /* We may want to cache the bundleRef at some point */
76 static CFBundleRef bundle = 0;
80 CFURLRef bundleURL = CFURLCreateWithFileSystemPath (kCFAllocatorDefault,
81 CFSTR("/System/Library/Frameworks/OpenGL.framework"), kCFURLPOSIXPathStyle, true);
83 bundle = CFBundleCreate (kCFAllocatorDefault, bundleURL);
84 CFRelease (bundleURL);
90 CFStringRef functionName = CFStringCreateWithCString
91 (kCFAllocatorDefault, func, kCFStringEncodingASCII);
95 function = CFBundleGetFunctionPointerForName (bundle, functionName);
97 CFRelease (functionName);
102 #elif !defined( WIN32 )
104 void *SGGetGLProcAddress(const char *func) {
105 static void *libHandle = NULL;
106 static void *(*glXGetProcAddressPtr)(const GLubyte*) = 0;
110 * Clear the error buffer
115 * Since libGL must be linked to the binary we run on, this is the
116 * right handle. That 'current binary' handle also avoids conflicts which
117 * arise from linking with a different libGL at link time an than later
118 * use the standard libGL at runtime ...
120 if (libHandle == NULL) {
121 libHandle = dlopen(NULL, RTLD_LAZY);
124 #if defined (__FreeBSD__)
125 const char *error = dlerror();
127 char *error = dlerror();
130 SG_LOG(SG_GENERAL, SG_INFO, error);
135 void* symbol = dlsym(libHandle, "glXGetProcAddress");
137 symbol = dlsym(libHandle, "glXGetProcAddressARB");
138 glXGetProcAddressPtr = (void *(*)(const GLubyte*)) symbol;
141 // First try the glx api function for that
142 if (glXGetProcAddressPtr) {
143 fptr = glXGetProcAddressPtr((const GLubyte*)func);
145 } else if (libHandle != NULL) {
146 fptr = dlsym(libHandle, func);
148 #if defined (__FreeBSD__)
149 const char *error = dlerror();
151 char *error = dlerror();
154 SG_LOG(SG_GENERAL, SG_INFO, error);