mirror of
https://gitlab.freedesktop.org/mesa/mesa.git
synced 2026-05-05 09:38:07 +02:00
read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
78c404f106
Previously, we emitted GPU commands and indirect state into the same buffer, using a stack/heap like system where we filled in commands from the start of the buffer, and state from the end of the buffer. We then flushed before the two met in the middle. Meeting in the middle is fatal, so you have to be certain that you reserve the correct amount of space before emitting commands or state for a draw. Currently, we will assert !no_batch_wrap and die if the estimate is ever too small. This has been mercifully obscure, but has happened on a number of occasions, and could in theory happen to any application that issues a large draw at just the wrong time. Estimating the amount of batch space required is painful - it's hard to get right, and getting it right involves a lot of code that would burn CPU time, and also be painful to maintain. Rolling back to a saved state and retrying is also painful - failing to save/restore all the required state will break things, and redoing state emission burns a lot of CPU. memcpy'ing to a new batch and continuing is painful, because commands we issue for a draw depend on earlier commands as well (such as STATE_BASE_ADDRESS, or the GPU being in a pirtacular state). The best plan is to never run out of space, which is totally doable but pretty wasteful - a pessimal draw requires a huge amount of space, and rarely occurs. Instead, we'd like to grow the batch buffer if we need more space and can't safely flush. We can't grow with a meet in the middle approach - we'd have to move the state to the end, which would mean updating every offset from dynamic state base address. Using separate batch and state buffers, where both fill starting at the beginning, makes it easy to grow either as needed. This patch separates the two concepts. We create a separate state buffer, with a second relocation list, and use that for brw_state_batch. However, this patch tries to retain the original flushing behavior - it adds the amount of batch and state space together, as if they were still co-existing in a single buffer. The hope is to flush at the same time as before. This is necessary to avoid provoking bugs caused by broken batch wrap handling (which we'll fix shortly). It also avoids suddenly increasing the size of the batch (due to state not taking up space), which could have a significant performance impact. We'll tune it later. v2: - Mark the statebuffer with EXEC_OBJECT_CAPTURE when supported (caught by Chris). Unfortunately, we lose the ability to capture state data on older kernels. - Continue to support the malloc'd shadow buffers. Reviewed-by: Matt Turner <mattst88@gmail.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> |
||
|---|---|---|
| bin | ||
| 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 | ||
| 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.