GLXContext CL_OpenGLWindowProvider_GLX::create_context_glx_1_2(const CL_OpenGLWindowDescription &gl_desc, GLXContext shared_context)
{
if (gl_desc.get_allow_lower_versions() == false)
throw CL_Exception("GLX 1.2 does not support opengl version selection.");
GLXContext context;
context = glx.glXCreateContext(x11_window.get_display(), opengl_visual_info, shared_context, GL_TRUE);
if(context == NULL)
throw CL_Exception("glXCreateContext failed");
return context;
}
GLXContext CL_OpenGLWindowProvider_GLX::create_context_glx_1_3(const CL_OpenGLWindowDescription &gl_desc, GLXContext shared_context)
{
GLXContext context;
context = glx.glXCreateNewContext(x11_window.get_display(), fbconfig, GLX_RGBA_TYPE, shared_context, True);
if(context == NULL)
throw CL_Exception("glXCreateContext failed");
ptr_glXCreateContextAttribs glXCreateContextAttribs = NULL;
if (is_glx_extension_supported("GLX_ARB_create_context"))
{
if (glx.glXGetProcAddressARB)
glXCreateContextAttribs = (ptr_glXCreateContextAttribs) glx.glXGetProcAddressARB((GLubyte*) "glXCreateContextAttribsARB");
if (glx.glXGetProcAddress)
glXCreateContextAttribs = (ptr_glXCreateContextAttribs) glx.glXGetProcAddress((GLubyte*) "glXCreateContextAttribsARB");
}
if (glXCreateContextAttribs)
{
// Install an X error handler so the application won't exit if GL 3.0 context allocation fails.
//
// Note this error handler is global. All display connections in all threads
// of a process use the same error handler, so be sure to guard against other
// threads issuing X commands while this code is running.
int (*oldHandler)(Display*, XErrorEvent*) = XSetErrorHandler(&cl_ctxErrorHandler);
GLXContext context_gl3 = 0;
int gl_major = gl_desc.get_version_major();
int gl_minor = gl_desc.get_version_minor();
if (gl_desc.get_allow_lower_versions() == false)
{
context_gl3 = create_context_glx_1_3_helper(shared_context, gl_major, gl_minor, gl_desc, glXCreateContextAttribs);
if (!context_gl3)
throw CL_Exception(cl_format("This application requires OpenGL %1.%2 or above. Try updating your drivers, or upgrade to a newer graphics card.", gl_major, gl_minor));
}
else
{
static const char opengl_version_list[] =
{
// Clanlib supported version pairs
4,1,
4,0,
3,3,
3,2,
3,1,
3,0,
0,0, // End of list
};
const char *opengl_version_list_ptr = opengl_version_list;
do
{
int major = *(opengl_version_list_ptr++);
if (major == 0)
break;
int minor = *(opengl_version_list_ptr++);
// Find the appropriate version in the list
if (major > gl_major)
continue;
if (major == gl_major)
{
if (minor > gl_minor)
continue;
}
context_gl3 = create_context_glx_1_3_helper(shared_context, gl_major, gl_minor, gl_desc, glXCreateContextAttribs);
}while(!context_gl3);
}
// Restore the original error handler
XSetErrorHandler( oldHandler );
if (context_gl3)
{
glx.glXDestroyContext(x11_window.get_display(), context);
context = context_gl3;
}
}
return context;
}