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In order to get support everywhere, this gets a bit complicated. On Sky Lake and later, everything is fine because HALIGN/VALIGN are specified in surface elements and are required to be at least 4 so any offsetting we may need to do falls neatly within the heavy restrictions placed on the X/Y Offset parameter of RENDER_SURFACE_STATE. On Broadwell and earlier, HALIGN/VALIGN are specified in pixels and are hard-coded to align to exactly the block size of the compressed texture. This means that, when reinterpreted as a non-compressed texture, the tile offsets may be anything and we can't rely on X/Y Offset. In order to work around this issue, we fall back to linear where we can trivially offset to whatever element we so choose. However, since linear texturing performance is terrible, we create a tiled shadow copy of the image to use for texturing. Whenever the user does a layout transition from anything to SHADER_READ_ONLY_OPTIMAL, we use blorp to copy the contents of the texture from the linear copy to the tiled shadow copy. This assumes that the client will use the image far more for texturing than as a storage image or render target. Even though we don't need the shadow copy on Sky Lake, we implement it this way first to make testing easier. Due to the hardware restriction that ASTC must not be linear, ASTC does not work yet. Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> |
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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.