如何在X窗口中指定OpenGL版本？

Question

我的问题是如何在X窗口系统中指定OpenGL版本,另外删除那些已弃用的函数.我的GL版本是4.3.我知道如何使用SDL或过剩来做到这一点.

Answer 1

首先,您必须首先了解如何使用裸X11/Xlib创建OpenGL上下文.看看这个代码https://github.com/datenwolf/codesamples/blob/master/samples/OpenGL/x11argb_opengl/x11argb_opengl.c

为了使其实际选择现代版本配置文件,使用此代码块

#if USE_GLX_CREATE_CONTEXT_ATTRIB
    #define GLX_CONTEXT_MAJOR_VERSION_ARB       0x2091
    #define GLX_CONTEXT_MINOR_VERSION_ARB       0x2092
    render_context = NULL;
    if( isExtensionSupported( glXQueryExtensionsString(Xdisplay, DefaultScreen(Xdisplay)), "GLX_ARB_create_context" ) ) {
        typedef GLXContext (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, Bool, const int*);
        glXCreateContextAttribsARBProc glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc)glXGetProcAddressARB( (const GLubyte *) "glXCreateContextAttribsARB" );
        if( glXCreateContextAttribsARB ) {
            int context_attribs[] =
            {
                GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
                GLX_CONTEXT_MINOR_VERSION_ARB, 0,
                //GLX_CONTEXT_FLAGS_ARB        , GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
                None
            };

            int (*oldHandler)(Display*, XErrorEvent*) = XSetErrorHandler(&ctxErrorHandler);

            render_context = glXCreateContextAttribsARB( Xdisplay, fbconfig, 0, True, context_attribs );

            XSync( Xdisplay, False );
            XSetErrorHandler( oldHandler );

            fputs("glXCreateContextAttribsARB failed", stderr);
        } else {
            fputs("glXCreateContextAttribsARB could not be retrieved", stderr);
        }
    } else {
            fputs("glXCreateContextAttribsARB not supported", stderr);
    }

    if(!render_context)
    {
#else

选择使用GLX_CONTEXT_FLAGS核心和/或转发兼容配置文件,这将禁用已弃用的功能.