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c7dcee58b5
Growing the batch/state buffer is a lot more dangerous than I thought.
A number of places emit multiple state buffer sections, and then write
data to the returned pointer, or save a pointer to brw->batch.state.bo
and then use it in relocations. If each call can grow, this can result
in stale map references or stale BO pointers. Furthermore, fences refer
to the old batch BO, and that reference needs to continue working.
To avoid these woes, we avoid ever swapping the brw->batch.*.bo pointer,
instead exchanging the brw_bo structures in place. That way, stale BO
references are fine - the GEM handle changes, but the brw_bo pointer
doesn't. We also defer the memcpy until a quiescent point, so callers
can write to the returned pointer - which may be in either BO - and
we'll sort it out and combine the two properly in the end.
v2/v3:
- Handle stale pointers in the shadow copy case, where realloc may or
may not move our shadow copy to a new address.
- Track the partial map explicitly, to avoid problems with buffer reuse
where multiple map modes exist (caught by Chris Wilson).
v4:
- Don't use realloc in the CPU shadow case, it isn't safe.
Fixes:
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|---|---|---|
| bin | ||
| build-support | ||
| docs | ||
| doxygen | ||
| include | ||
| m4 | ||
| scons | ||
| scripts | ||
| src | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .travis.yml | ||
| Android.common.mk | ||
| Android.mk | ||
| appveyor.yml | ||
| autogen.sh | ||
| CleanSpec.mk | ||
| common.py | ||
| configure.ac | ||
| install-gallium-links.mk | ||
| install-lib-links.mk | ||
| Makefile.am | ||
| meson.build | ||
| meson_options.txt | ||
| REVIEWERS | ||
| SConstruct | ||
| VERSION | ||
File: docs/README.WIN32 Last updated: 21 June 2013 Quick Start ----- ----- Windows drivers are build with SCons. Makefiles or Visual Studio projects are no longer shipped or supported. Run scons libgl-gdi to build gallium based GDI driver. This will work both with MSVS or Mingw. Windows Drivers ------- ------- At this time, only the gallium GDI driver is known to work. Source code also exists in the tree for other drivers in src/mesa/drivers/windows, but the status of this code is unknown. Recipe ------ Building on windows requires several open-source packages. These are steps that work as of this writing. - install python 2.7 - install scons (latest) - install mingw, flex, and bison - install pywin32 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get pywin32-218.4.win-amd64-py2.7.exe - install git - download mesa from git see https://www.mesa3d.org/repository.html - run scons General ------- After building, you can copy the above DLL files to a place in your PATH such as $SystemRoot/SYSTEM32. If you don't like putting things in a system directory, place them in the same directory as the executable(s). Be careful about accidentially overwriting files of the same name in the SYSTEM32 directory. The DLL files are built so that the external entry points use the stdcall calling convention. Static LIB files are not built. The LIB files that are built with are the linker import files associated with the DLL files. The si-glu sources are used to build the GLU libs. This was done mainly to get the better tessellator code. If you have a Windows-related build problem or question, please post to the mesa-dev or mesa-users list.