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The GL3 context is created using the glXCreateContextAttribs function which is part of the GLX_ARB_create_context extension. However previously the function pointers from GLX extensions were only retrieved once the GL context is created. That meant that the GL3 context creation function would always assume that the extension is not supported so it would always fail. This patch changes it to query the functions when the renderer is set up instead. The base winsys feature flags that are determined while querying the functions are stored in a member of CoglGLXRenderer. These are then copied to the CoglContext when it is initialised. The spec for glXGetProcAddress says that the functions returned are context-independent. That implies that it is safe to call it without binding a context although that is not explicitly stated as far as I can tell. A big of googling finds this DRI documentation which says it can be used without a context: http://dri.freedesktop.org/wiki/glXGetProcAddressNeverReturnsNULL And also this code sample: http://www.opengl.org/wiki/Tutorial:_OpenGL_3.0_Context_Creation_%28GLX%29 One point that makes me concerned that this might not always work in practice is that the code in SDL2 to create a GL3 context first creates a dummy GL2 context in order to have something bound before it calls glXGetProcAddress. I think this may just be a misunderstanding based on how wglGetProcAddress works however. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit 04a7aca9a98e84e43ac5559305a1358112902e30)
173 lines
7.3 KiB
C
173 lines
7.3 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*
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*/
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/* This can be included multiple times with different definitions for
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* the COGL_WINSYS_FEATURE_* functions.
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*/
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/* Macro prototypes:
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* COGL_WINSYS_FEATURE_BEGIN (major_glx_version, minor_glx_version,
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* name, namespaces, extension_names,
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* implied_public_feature_flags,
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* implied_winsys_feature)
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* COGL_WINSYS_FEATURE_FUNCTION (return_type, function_name,
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* (arguments))
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* ...
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* COGL_WINSYS_FEATURE_END ()
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*
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* Note: You can list multiple namespace and extension names if the
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* corresponding _FEATURE_FUNCTIONS have the same semantics accross
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* the different extension variants.
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*
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* XXX: NB: Don't add a trailing semicolon when using these macros
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*/
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/* Base functions that we assume are always available */
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COGL_WINSYS_FEATURE_BEGIN (0, 0, /* always available */
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base_glx_functions,
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"\0",
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"\0",
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0, /* no implied public feature */
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0 /* no winsys feature */)
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COGL_WINSYS_FEATURE_FUNCTION (void, glXDestroyContext,
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(Display *dpy, GLXContext ctx))
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COGL_WINSYS_FEATURE_FUNCTION (void, glXSwapBuffers,
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(Display *dpy, GLXDrawable drawable))
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COGL_WINSYS_FEATURE_FUNCTION (Bool, glXIsDirect,
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(Display *dpy, GLXContext ctx))
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COGL_WINSYS_FEATURE_FUNCTION (int, glXGetFBConfigAttrib,
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(Display *dpy, GLXFBConfig config,
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int attribute, int *value))
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COGL_WINSYS_FEATURE_FUNCTION (GLXWindow, glXCreateWindow,
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(Display *dpy, GLXFBConfig config,
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Window win, const int *attribList))
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COGL_WINSYS_FEATURE_FUNCTION (void, glXDestroyWindow,
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(Display *dpy, GLXWindow window))
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COGL_WINSYS_FEATURE_FUNCTION (GLXPixmap, glXCreatePixmap,
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(Display *dpy, GLXFBConfig config,
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Pixmap pixmap, const int *attribList))
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COGL_WINSYS_FEATURE_FUNCTION (void, glXDestroyPixmap,
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(Display *dpy, GLXPixmap pixmap))
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COGL_WINSYS_FEATURE_FUNCTION (GLXContext, glXCreateNewContext,
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(Display *dpy, GLXFBConfig config,
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int renderType, GLXContext shareList,
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Bool direct))
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COGL_WINSYS_FEATURE_FUNCTION (Bool, glXMakeContextCurrent,
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(Display *dpy, GLXDrawable draw,
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GLXDrawable read, GLXContext ctx))
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COGL_WINSYS_FEATURE_FUNCTION (void, glXSelectEvent,
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(Display *dpy, GLXDrawable drawable,
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unsigned long mask))
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COGL_WINSYS_FEATURE_FUNCTION (GLXFBConfig *, glXGetFBConfigs,
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(Display *dpy, int screen, int *nelements))
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COGL_WINSYS_FEATURE_FUNCTION (GLXFBConfig *, glXChooseFBConfig,
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(Display *dpy, int screen,
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const int *attrib_list, int *nelements))
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COGL_WINSYS_FEATURE_FUNCTION (XVisualInfo *, glXGetVisualFromFBConfig,
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(Display *dpy, GLXFBConfig config))
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COGL_WINSYS_FEATURE_END ()
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COGL_WINSYS_FEATURE_BEGIN (255, 255,
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texture_from_pixmap,
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"EXT\0",
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"texture_from_pixmap\0",
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0,
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COGL_WINSYS_FEATURE_TEXTURE_FROM_PIXMAP)
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COGL_WINSYS_FEATURE_FUNCTION (void, glXBindTexImage,
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(Display *display,
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GLXDrawable drawable,
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int buffer,
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int *attribList))
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COGL_WINSYS_FEATURE_FUNCTION (void, glXReleaseTexImage,
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(Display *display,
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GLXDrawable drawable,
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int buffer))
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COGL_WINSYS_FEATURE_END ()
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COGL_WINSYS_FEATURE_BEGIN (255, 255,
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video_sync,
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"SGI\0",
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"video_sync\0",
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0,
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COGL_WINSYS_FEATURE_VBLANK_COUNTER)
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COGL_WINSYS_FEATURE_FUNCTION (int, glXGetVideoSync,
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(unsigned int *count))
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COGL_WINSYS_FEATURE_FUNCTION (int, glXWaitVideoSync,
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(int divisor,
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int remainder,
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unsigned int *count))
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COGL_WINSYS_FEATURE_END ()
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COGL_WINSYS_FEATURE_BEGIN (255, 255,
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swap_control,
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"SGI\0",
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"swap_control\0",
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0,
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COGL_WINSYS_FEATURE_SWAP_THROTTLE)
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COGL_WINSYS_FEATURE_FUNCTION (int, glXSwapInterval,
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(int interval))
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COGL_WINSYS_FEATURE_END ()
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COGL_WINSYS_FEATURE_BEGIN (255, 255,
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copy_sub_buffer,
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"MESA\0",
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"copy_sub_buffer\0",
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0,
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/* We initially assumed that copy_sub_buffer is synchronized on
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* which is only the case for a subset of GPUs for example it is not
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* synchronized on INTEL gen6 and gen7, so we remove this assumption
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* for now
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*/
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#if 0
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COGL_WINSYS_FEATURE_SWAP_REGION_SYNCHRONIZED)
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#endif
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0)
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COGL_WINSYS_FEATURE_FUNCTION (void, glXCopySubBuffer,
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(Display *dpy,
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GLXDrawable drawable,
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int x, int y, int width, int height))
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COGL_WINSYS_FEATURE_END ()
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COGL_WINSYS_FEATURE_BEGIN (255, 255,
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swap_event,
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"INTEL\0",
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"swap_event\0",
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0,
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COGL_WINSYS_FEATURE_SWAP_BUFFERS_EVENT)
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COGL_WINSYS_FEATURE_END ()
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COGL_WINSYS_FEATURE_BEGIN (255, 255,
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create_context,
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"ARB\0",
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"create_context",
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0,
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0)
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COGL_WINSYS_FEATURE_FUNCTION (GLXContext, glXCreateContextAttribs,
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(Display *dpy,
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GLXFBConfig config,
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GLXContext share_context,
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Bool direct,
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const int *attrib_list))
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COGL_WINSYS_FEATURE_END ()
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