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2010-02-24dri_interface.h: Add DRI image and eglImageLookup extensionsKristian Høgsberg
These are used for implementing the various EGLImage extensions.
2010-02-16dri2: Event driven buffer validation.Francisco Jerez
When a buffer invalidation event is received from the X server, the "invalidate" hook of the DRI2 flush extension is executed: A generic implementation (dri2InvalidateDrawable) is provided that just bumps the "pStamp" sequence number in __DRIdrawableRec. For old servers not supporting buffer invalidation events, the invalidate hook will be called before flushing the fake front/back buffer (that's typically once per frame -- not a lot worse than the situation we were in before). No effort has been made on preserving backwards compatibility with version 2 of the flush extension, but I think it's acceptable because AFAIK no released stack is making use of it. Signed-off-by: Kristian Høgsberg <krh@bitplanet.net>
2010-02-09dri_interface: Introduce DRI tokens for the texBuffer texture formatsKristian Høgsberg
This used to take GLX tokens, but the DRI interface can't depend on GLX defines. We fix this by introducing DRI tokens that have the same value as the GLX texture format tokens.
2010-01-08DRI2: add SwapBuffers supportJesse Barnes
Support the new DRI2 protocol request, DRI2SwapBuffers, in both direct and indirect rendering context. This request allows the display server to optimize back->front swaps (e.g. through page flipping) and allows us to more easily support other GLX features like swap interval and the OML sync extension in DRI2. Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-04-24GNU/Hurd fixesSamuel Thibault
Here is a couple of fixes for GNU/Hurd: - dri_interface.h: no libdrm support either. - configure.ac: - GNU/Hurd is a GNU OS with _GNU_SOURCE and PTHREADS. - GNU needs a couple of flags like other OSes Signed-off-by: Dan Nicholson <dbn.lists@gmail.com>
2009-04-24DRI2: Implement interface for drivers to access DRI2GetBuffersWithFormatIan Romanick
Signed-off-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Kristian Høgsberg <krh@redhat.com>
2009-04-09DRI2: Provide an interface for drivers to flush front-buffer renderingIan Romanick
Signed-off-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Kristian Høgsberg <krh@redhat.com>
2009-03-20Fix DRI2 accelerated EXT_texture_from_pixmap with GL_RGB format.Eric Anholt
This requires upgrading the interface so that the argument to glXBindTexImageEXT isn't just dropped on the floor. Note that this only fixes the accelerated path on Intel, as Mesa's texture format support is missing x8r8g8b8 support (right now, GL_RGB textures get uploaded as a8r8gb8, but in this case we're not doing the upload so we can't really work around it that way). Fixes bugs with compositors trying to use shaders that use alpha channels, on windows without a valid alpha channel. Bug #19910 and likely others as well. Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
2009-02-23glx: add support for a reallyFlush() function before swap occurs.Alan Hourihane
2009-01-19dri: add fake front definitionsAlan Hourihane
2008-12-18dri: fix for Cygwin compilation, bug 19144Jon Turney
2008-09-21Merge branch 'master' into gallium-0.2Keith Whitwell
Conflicts: include/GLES/egl.h include/GLES/egltypes.h src/egl/main/eglconfig.c src/egl/main/eglconfig.h src/glu/sgi/libnurbs/interface/bezierEval.h src/glu/sgi/libnurbs/interface/bezierPatch.h src/glu/sgi/libnurbs/interface/bezierPatchMesh.h src/glu/sgi/libnurbs/internals/dataTransform.h src/glu/sgi/libnurbs/internals/displaymode.h src/glu/sgi/libnurbs/internals/sorter.h src/glu/sgi/libnurbs/nurbtess/definitions.h src/glu/sgi/libnurbs/nurbtess/directedLine.h src/glu/sgi/libnurbs/nurbtess/gridWrap.h src/glu/sgi/libnurbs/nurbtess/monoChain.h src/glu/sgi/libnurbs/nurbtess/monoPolyPart.h src/glu/sgi/libnurbs/nurbtess/monoTriangulation.h src/glu/sgi/libnurbs/nurbtess/partitionX.h src/glu/sgi/libnurbs/nurbtess/partitionY.h src/glu/sgi/libnurbs/nurbtess/polyDBG.h src/glu/sgi/libnurbs/nurbtess/polyUtil.h src/glu/sgi/libnurbs/nurbtess/primitiveStream.h src/glu/sgi/libnurbs/nurbtess/quicksort.h src/glu/sgi/libnurbs/nurbtess/rectBlock.h src/glu/sgi/libnurbs/nurbtess/sampleComp.h src/glu/sgi/libnurbs/nurbtess/sampleCompBot.h src/glu/sgi/libnurbs/nurbtess/sampleCompRight.h src/glu/sgi/libnurbs/nurbtess/sampleCompTop.h src/glu/sgi/libnurbs/nurbtess/sampleMonoPoly.h src/glu/sgi/libnurbs/nurbtess/sampledLine.h src/glu/sgi/libnurbs/nurbtess/searchTree.h src/glu/sgi/libnurbs/nurbtess/zlassert.h src/glu/sgi/libutil/error.c src/glu/sgi/libutil/glue.c src/glu/sgi/libutil/gluint.h src/glu/sgi/libutil/project.c src/glu/sgi/libutil/registry.c src/glx/x11/Makefile src/glx/x11/glxclient.h src/glx/x11/glxext.c src/mesa/drivers/dri/ffb/ffb_dd.h src/mesa/drivers/dri/ffb/ffb_points.h src/mesa/drivers/dri/gamma/gamma_context.h src/mesa/drivers/dri/gamma/gamma_macros.h src/mesa/drivers/dri/i810/i810context.h src/mesa/drivers/dri/r128/r128_dd.h src/mesa/drivers/dri/r128/r128_tex.h src/mesa/drivers/dri/tdfx/tdfx_dd.h src/mesa/drivers/x11/xm_buffer.c src/mesa/glapi/glapi.c src/mesa/main/dispatch.c src/mesa/main/state.c src/mesa/main/texstate.c src/mesa/shader/arbprogparse.c src/mesa/shader/arbprogram.c src/mesa/shader/nvfragparse.c src/mesa/shader/nvprogram.c src/mesa/shader/shader_api.c src/mesa/sources src/mesa/swrast/s_aaline.c src/mesa/swrast/s_aaline.h src/mesa/swrast/s_aatriangle.h src/mesa/swrast/s_accum.c src/mesa/swrast/s_alpha.h src/mesa/swrast/s_bitmap.c src/mesa/swrast/s_blend.h src/mesa/swrast/s_context.c src/mesa/swrast/s_copypix.c src/mesa/swrast/s_depth.c src/mesa/swrast/s_depth.h src/mesa/swrast/s_drawpix.c src/mesa/swrast/s_drawpix.h src/mesa/swrast/s_feedback.c src/mesa/swrast/s_feedback.h src/mesa/swrast/s_fog.h src/mesa/swrast/s_lines.h src/mesa/swrast/s_logic.h src/mesa/swrast/s_masking.h src/mesa/swrast/s_points.c src/mesa/swrast/s_points.h src/mesa/swrast/s_readpix.c src/mesa/swrast/s_span.c src/mesa/swrast/s_span.h src/mesa/swrast/s_stencil.h src/mesa/swrast/s_texcombine.c src/mesa/swrast/s_texcombine.h src/mesa/swrast/s_texfilter.c src/mesa/swrast/s_texfilter.h src/mesa/swrast/s_texstore.c src/mesa/swrast/s_triangle.c src/mesa/swrast/s_triangle.h src/mesa/swrast/s_zoom.h src/mesa/swrast_setup/ss_context.c src/mesa/swrast_setup/ss_triangle.h src/mesa/tnl/t_draw.c src/mesa/tnl/t_vb_light.c src/mesa/tnl/t_vertex_generic.c src/mesa/tnl/t_vertex_sse.c src/mesa/tnl/t_vp_build.h src/mesa/tnl/tnl.h src/mesa/x86/common_x86.c
2008-09-19Update to SGI FreeB 2.0.Adam Jackson
Under the terms of version 1.1, "once Covered Code has been published under a particular version of the License, Recipient may, for the duration of the License, continue to use it under the terms of that version, or choose to use such Covered Code under the terms of any subsequent version published by SGI." FreeB 2.0 license refers to "dates of first publication". They are here taken to be 1991-2000, as noted in the original license text: ** Original Code. The Original Code is: OpenGL Sample Implementation, ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. ** Copyright in any portions created by third parties is as indicated ** elsewhere herein. All Rights Reserved. Official FreeB 2.0 text: http://oss.sgi.com/projects/FreeB/SGIFreeSWLicB.2.0.pdf As always, this code has not been tested for conformance with the OpenGL specification. OpenGL conformance testing is available from http://khronos.org/ and is required for use of the OpenGL logo in product advertising and promotion.
2008-09-11Merge branch 'master' of git+ssh://git.freedesktop.org/git/mesa/mesa into ↵Alan Hourihane
gallium-0.2 Conflicts: src/mesa/drivers/dri/i915/intel_ioctl.c src/mesa/main/texstore.c src/mesa/tnl/t_vp_build.c src/mesa/vbo/vbo_exec_draw.c
2008-09-11Merge branch 'gallium-0.1' into gallium-0.2Keith Whitwell
A first attempt at moving gallium onto a branch directly off master... It will be interesting to see how much work this takes to get running. Have resolved the conflicts semi-arbitarily, not compiled or tested. Conflicts: .gitignore Makefile configs/config.mgw configs/darwin configs/darwin-x86ppc configs/default configs/freebsd-dri configs/linux-dri configs/linux-dri-xcb configs/linux-fbdev configs/linux-static configs/linux-x86-64-static configs/linux-x86-static doxygen/Makefile include/GL/gl.h progs/demos/Makefile progs/demos/descrip.mms progs/demos/texenv.c progs/egl/.gitignore progs/egl/Makefile progs/glsl/.gitignore progs/glsl/Makefile progs/glsl/convolutions.c progs/samples/Makefile.mgw progs/tests/.gitignore progs/trivial/.gitignore progs/trivial/point-param.c progs/trivial/tri.c progs/xdemos/.gitignore progs/xdemos/glthreads.c src/egl/drivers/demo/Makefile src/egl/drivers/dri/Makefile src/egl/main/Makefile src/glu/Makefile src/glu/sgi/Makefile src/glu/sgi/Makefile.mgw src/glut/glx/Makefile.mgw src/glut/os2/WarpWin.cpp src/glut/os2/glut_cindex.cpp src/glut/os2/glut_gamemode.cpp src/glut/os2/glut_win.cpp src/glut/os2/glut_winmisc.cpp src/glut/os2/os2_glx.cpp src/glut/os2/os2_menu.cpp src/glut/os2/os2_winproc.cpp src/glw/Makefile src/glx/x11/dri_glx.c src/glx/x11/glxext.c src/mesa/Makefile src/mesa/Makefile.mgw src/mesa/descrip.mms src/mesa/drivers/beos/Makefile src/mesa/drivers/common/descrip.mms src/mesa/drivers/common/driverfuncs.c src/mesa/drivers/directfb/Makefile src/mesa/drivers/dri/Makefile.template src/mesa/drivers/dri/common/dri_bufmgr.c src/mesa/drivers/dri/common/dri_bufmgr.h src/mesa/drivers/dri/common/dri_util.c src/mesa/drivers/dri/common/extension_helper.h src/mesa/drivers/dri/common/mmio.h src/mesa/drivers/dri/common/utils.c src/mesa/drivers/dri/common/utils.h src/mesa/drivers/dri/glcore/Makefile src/mesa/drivers/dri/i810/i810screen.c src/mesa/drivers/dri/i915/intel_ioctl.c src/mesa/drivers/dri/i915/intel_ioctl.h src/mesa/drivers/dri/i915/intel_screen.c src/mesa/drivers/dri/i915/server/i830_common.h src/mesa/drivers/dri/i915/server/i830_dri.h src/mesa/drivers/dri/i965/intel_screen.c src/mesa/drivers/dri/i965/server/i830_common.h src/mesa/drivers/dri/i965/server/i830_dri.h src/mesa/drivers/dri/mach64/mach64_screen.c src/mesa/drivers/dri/nouveau/nouveau_context.h src/mesa/drivers/dri/nouveau/nouveau_fifo.c src/mesa/drivers/dri/nouveau/nouveau_fifo.h src/mesa/drivers/dri/nouveau/nouveau_screen.c src/mesa/drivers/dri/nouveau/nouveau_screen.h src/mesa/drivers/dri/r128/r128_tex.h src/mesa/drivers/dri/savage/savageioctl.h src/mesa/drivers/fbdev/Makefile src/mesa/drivers/osmesa/Makefile src/mesa/drivers/osmesa/descrip.mms src/mesa/drivers/x11/Makefile src/mesa/drivers/x11/descrip.mms src/mesa/drivers/x11/xm_dd.c src/mesa/glapi/glapi.c src/mesa/glapi/glthread.c src/mesa/main/api_validate.c src/mesa/main/attrib.c src/mesa/main/bufferobj.c src/mesa/main/bufferobj.h src/mesa/main/buffers.c src/mesa/main/config.h src/mesa/main/context.c src/mesa/main/descrip.mms src/mesa/main/drawpix.c src/mesa/main/enums.c src/mesa/main/fbobject.c src/mesa/main/glheader.h src/mesa/main/imports.c src/mesa/main/mipmap.c src/mesa/main/mm.c src/mesa/main/mm.h src/mesa/main/mtypes.h src/mesa/main/points.c src/mesa/main/sources src/mesa/main/state.c src/mesa/main/texcompress_fxt1.c src/mesa/main/texenvprogram.c src/mesa/main/texobj.c src/mesa/main/texstate.c src/mesa/main/texstore.c src/mesa/math/descrip.mms src/mesa/shader/arbprogram.c src/mesa/shader/descrip.mms src/mesa/shader/prog_execute.c src/mesa/shader/prog_statevars.c src/mesa/shader/prog_statevars.h src/mesa/shader/prog_uniform.c src/mesa/shader/program.c src/mesa/shader/program.h src/mesa/shader/shader_api.c src/mesa/shader/slang/descrip.mms src/mesa/shader/slang/library/slang_vertex_builtin_gc.h src/mesa/sources src/mesa/swrast/descrip.mms src/mesa/swrast/s_drawpix.c src/mesa/swrast/s_fragprog.c src/mesa/swrast/s_readpix.c src/mesa/swrast/s_span.c src/mesa/swrast_setup/descrip.mms src/mesa/tnl/descrip.mms src/mesa/tnl/t_context.h src/mesa/tnl/t_vp_build.c src/mesa/tnl/tnl.h src/mesa/vbo/descrip.mms src/mesa/vbo/vbo_context.c src/mesa/vbo/vbo_exec_array.c src/mesa/x86-64/xform4.S src/mesa/x86/rtasm/x86sse.c src/mesa/x86/rtasm/x86sse.h windows/VC6/progs/glut/glut.dsp windows/VC7/mesa/gdi/gdi.vcproj windows/VC7/mesa/glu/glu.vcproj windows/VC7/mesa/mesa.sln windows/VC7/mesa/mesa/mesa.vcproj windows/VC7/mesa/osmesa/osmesa.vcproj windows/VC7/progs/glut/glut.vcproj windows/VC8/mesa/gdi/gdi.vcproj windows/VC8/mesa/glu/glu.vcproj windows/VC8/mesa/mesa.sln windows/VC8/mesa/mesa/mesa.vcproj windows/VC8/progs/glut/glut.vcproj
2008-08-29DRI2: Drop sarea, implement swap buffers in the X server.Kristian Høgsberg
2008-08-08Apple: Some changes to fix compilation problems on OSXJeremy Huddleston
2008-06-24mesa: Don't include sys/types.h on WinCE.José Fonseca
We probably shouldn't be including sys/types.h at all, but let's leave that for another time.
2008-06-12revert the DRI2 commitsAlan Hourihane
2008-06-11add missed files for DRI2 mergeAlan Hourihane
2008-06-11Bring in DRI2 changesAlan Hourihane
2008-05-26Remove CVS keywords.José Fonseca
2008-05-23drop GLcoreGeorge Sapountzis
2008-05-20Add DRI driver that uses the mesa swrast module.George Sapountzis
2008-04-23glcore: build from mesaGeorge Sapountzis
2008-03-31DRI interface changes and DRI2 direct rendering support.Kristian Høgsberg
Add DRI2 direct rendering support to libGL and add DRI2 client side protocol code. Extend the GLX 1.3 create drawable functions in glx_pbuffer.c to call into the DRI driver when possible. Introduce __DRIconfig, opaque struct that represents a DRI driver configuration. Get's rid of the open coded __GLcontextModes in the DRI driver interface and the context modes create and destroy functions that the loader was requires to provide. glcore.h is no longer part of the DRI driver interface. The DRI config is GL binding agnostic, that is, not specific to GLX, EGL or other bindings. The core API is now also an extension, and the driver exports a list of extensions as the symbol __driDriverExtensions, which the loader must dlsym() for. The list of extension will always include the DRI core extension, which allows creating and manipulating DRI screens, drawables and contexts. The DRI legacy extension, when available, provides alternative entry points for creating the DRI objects that work with the XF86DRI infrastructure. Change DRI2 client code to not use drm drawables or contexts. We never used drm_drawable_t's and the only use for drm_context_t was as a unique identifier when taking the lock. We now just allocate a unique lock ID out of the DRILock sarea block. Once we get rid of the lock entirely, we can drop this hack. Change the interface between dri_util.c and the drivers, so that the drivers now export the DriverAPI struct as driDriverAPI instead of the InitScreen entry point. This lets us avoid dlsym()'ing for the DRI2 init screen function to see if DRI2 is supported by the driver.
2008-03-09DRI2: Make setTexBuffer take a __DRIdrawable instead of a BO handle.Kristian Høgsberg
This fixes a problem where texturing from the same Pixmap more than once per batchbuffer would hang the DRI driver. We just use the region associated with the front left renderbuffer of the __DRIdrawable for texturing, which avoids creating different regions for the same BO. This change also make GLX_EXT_texture_from_pixmap work for direct rendering, since tracking the __DRIdrawable -> BO handle now uses the standard DRI2 event buffer. Of course, DRI2 direct rendering doesn't exist yet. Finally, this commit bumps the DRI interface version again, accounting for the change in the DRI_TEX_BUFFER extension and the change in commit 0bba0e5be7a4a7275dad1edc34bdcc134ea1f424 to pass in the event buffer head index on drawable creation.
2008-03-09DRI2: Add event buffer head as an argument to driCreateNewDrawable().Kristian Høgsberg
The DRI driver needs to know where in the buffer to start reading.
2008-03-03[dri2] Add tail pointer to reemitDrawableInfo callback.Kristian Høgsberg
When the DRI doesn't parse the event buffer for a while, the X server may overwrite data that the driver didn't get a chance to look at. The reemitDrawableInfo callback requests that the X server reemit all info for the specified drawable. To make use of this, the drive needs to know the new tail pointer so it know where to start reading from.
2008-02-29Use __DRIextension mechanism providing loader functionality to the driver.Kristian Høgsberg
Instead of passing in a fixed struct, the loader now passes in a list of __DRIextension structs, to advertise the functionality it can provide to the driver. Each extension is individually versioned and can be extended or phased out as the interface develops.
2008-02-29Reduce the versioning madness required to create a DRI2 screen.Kristian Høgsberg
Right now the DRI2 screen constructor takes 3 different versions: DRI, DDX and DRM. This is mostly useless, though: DRI: The DRI driver doesn't actually care about the DRI protocol, it only talks to the loader, which in turn speaks DRI protocol. Thus, the DRI protocol version is of not interest to the DRI driver, but it needs to know what functionality the loader provides. At this point that's reflected in the __DRIinterfaceMethods struct and the internal_version integer. DDX: The DDX version number is essentially used to track extensions to the SAREA. With DRI2 the SAREA consists of a number of versioned, self-describing blocks, so the DDX version is no longer interesting. DRM: We have the fd, lets just ask the kernel ourselves.
2008-02-25Remove GetMSC DriverAPI function.Kristian Høgsberg
The DriverAPI is internal to the DRI drivers and GetDrawableMSC obsoletes GetMSC. Also, since the DRI driver interface has not yet been released, just drop the getMSC function from the DRI interface instead using the ABI preserving version mechanism. Finally, using void pointer privates in the DRI interface is not allowed, always pass the actual types around (__DRIdrawable in this case) to enhance type safety and readability of the code.
2008-02-14Add TTM buffer object based texture from pixmap implementation.Kristian Høgsberg
Currently only implemented for intel hw.
2008-02-14Add new DRI2 infrastructure.Kristian Høgsberg
2007-10-29Refactor and fix core vblank supportJesse Barnes
Consolidate support for synchronizing to and retrieving vblank counters. Also fix the core vblank code to return monotonic MSC counters, which are required by some GLX extensions. Adding support for multiple pipes to a low level driver is fairly easy, the Intel 965 driver provides simple example code (see intel_buffers.c:intelWindowMoved()). The new code bumps the media stream counter extension version to 2 and adds a new getDrawableMSC callback. This callback takes a drawablePrivate pointer, which is used to calculate the MSC value seen by clients based on the actual vblank counter(s) returned from the kernel. The new drawable private fields are as follows: - vblSeq - used for tracking vblank counts for buffer swapping - vblFlags - flags (e.g. current pipe), updated by low level driver - msc_base - MSC counter from the last time the current pipe changed - vblank_base - kernel DRM vblank counter from the last time the pipe changed Using the above variables, the core vblank code (in vblank.c) can calculate a monotonic MSC value. The low level DRI drivers are responsible for updating the current pipe (by setting VBLANK_FLAG_SECONDARY for example in vblFlags) along with msc_base and vblank_base whenever the pipe associated with a given drawable changes (again, see intelWindowMoved for an example of this). Drivers should fill in the GetDrawableMSC DriverAPIRec field to point to driDrawableGetMSC32 and add code for pipe switching as outlined above to fully support the new scheme.
2007-10-14Add GL_CORE_WINDOWS define to glcore.hGeorge Sapountzis
This is for consistency with glproto. The GL_CORE defines should probably be dropped. ---- Author: Alexander Gottwald <alexander.gottwald@s1999.tu-chemnitz.de> Date: Mon Jun 21 13:35:05 2004 +0000 Bug 782: Merge native OpenGL for Windows from CYGWIN branch
2007-10-11Add a version field to __DRIextension.Kristian Høgsberg
2007-10-11Move new texOffset extension to the new extension mechanism.Kristian Høgsberg
2007-10-11Convert a left-over private void * to __DRIcontext *.Kristian Høgsberg
2007-10-11Remove now unused getProcAddress from DRIinterfaceMethods.Kristian Høgsberg
2007-10-11Add a DRI_ReadDrawable marker extension to signal read drawable capability.Kristian Høgsberg
2007-10-11Move media stream counter entry points to new extension.Kristian Høgsberg
2007-10-11Move GLX_MESA_swap_frame_usage DRI entry points to the new mechanism.Kristian Høgsberg
2007-10-11Move GLX_MESA_allocate_memory related functions to new extension mechanism.Kristian Høgsberg
2007-10-10Move swap_interval to new extension mechanism.Kristian Høgsberg
2007-10-10Move the copySubBuffer extension over to the new mechanism.Kristian Høgsberg
2007-10-10Implement new screen extension API.Kristian Høgsberg
This new API lets the loader examine DRI level extensions provided by the driver in a forward compatible manner. Much of the churn in the DRI interface is adding support for new extensions or removing old, unused extensions. This new extension mechanism lets the loader query the extensions provided by the driver and implement the extensions it knows about. Deprecating extensions is done by not exporting that extension in the list, which doesn't require keeping old function pointers around to preserve ABI.
2007-10-10Stop passing in unused fbconfigs to createNewScreen.Kristian Høgsberg
2007-10-10Convert all DRI entrypoints to take pointers to __DRI* types.Kristian Høgsberg
The entrypoints take a mix of __DRIscreen * and void * (screen private) arguments (similarly for contexts and drawables). This patch does away with passing the private void pointer and always only passes the fully typed __DRIscreen pointer and always as the first argument. This makes the interface more consistent and increases type safety, and catches a bug where we would pass a screen private to DRIdrawable::getSBC.
2007-10-10Remove screenConfigs from __DRIscreen.Kristian Høgsberg
The screenConfigs field of __DRIscreen points back to the containing __GLXscreenConfigs struct. This is a serious abstraction violation; it assumes that the loader is libGL and that there *is* a __GLXscreenConfigs type in the loader. Using the containerOf macro, we can get from the __DRIscreen pointer to the containing __GLXscreenConfigs struct, at a place in the stack where the above is a valid assumption. Besides, the __DRI* structs shouldn't hold state other than the private pointer.
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