https://bugs.winehq.org/show_bug.cgi?id=39563 Alex Henrie <alexhenrie24(a)gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |thunderbird2k(a)gmail.com --- Comment #6 from Alex Henrie <alexhenrie24(a)gmail.com> --- Never mind, I found my answer in the source code for is_extension_supported <https://source.winehq.org/git/wine.git/blob/cbaab82d086e36dacaa22c6adf80f9114bb820fb:/dlls/opengl32/wgl.c#l802>: /* We use the GetProcAddress function from the display driver to retrieve function pointers * for OpenGL and WGL extensions. In case of winex11.drv the OpenGL extension lookup is done * using glXGetProcAddress. This function is quite unreliable in the sense that its specs don't * require the function to return NULL when an extension isn't found. For this reason we check * if the OpenGL extension required for the function we are looking up is supported. */ This is corroborated by the GLX 1.4 specification <https://www.opengl.org/registry/doc/glx1.4.pdf#page=41>: A non-NULL return value for glXGetProcAddress does not guarantee that an extension function is actually supported at runtime. The client must also query glGetString(GL_EXTENSIONS) or glXQueryExtensionsString to determine if an extension is supported by a particular context. The documentation at <https://www.opengl.org/wiki/Load_OpenGL_Functions> makes it sound like calling a function without checking the current context's extension string can cause a program crash, so reverting bfd4836867d6d90eaeae6ccbc02e37678b59b8f1 would probably just trade one set of program crashes for another. -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.