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Sandy Bridge does not technically support mipmapped depth/stencil. In order to work around this, we allocate what are effectively completely separate images for each miplevel, ensure that they are page-aligned, and manually offset to them. Prior to layered rendering, this was a simple matter of setting a large enough halign/valign. With the advent of layered rendering, however, things got more complicated. Now, things weren't as simple as just handing a surface off to the hardware. Any miplevel of a normally mipmapped surface can be considered as just an array surface given the right qpitch. However, the hardware gives us no capability to specify qpitch so this won't work. Instead, the chosen solution was to use a new "all slices at each LOD" layout which laid things out as a mipmap of arrays rather than an array of mipmaps. This way you can easily offset to any of the miplevels and each is a valid array. Unfortunately, the "all slices at each lod" concept missed one fundamental thing about SNB HiZ and stencil hardware: It doesn't just always act as if you're always working with a non-mipmapped surface, it acts as if you're always working on a non-mipmapped surface of the same size as LOD0. In other words, even though it may only write the upper-left corner of each array slice, the qpitch for the array is for a surface the size of LOD0 of the depth surface. This mistake causes us to under-allocate HiZ and stencil in some cases and also to accidentally allow different miplevels to overlap. Sadly, piglit test coverage didn't quite catch this until I started making changes to the resolve code that caused additional HiZ resolves in certain tests. This commit switches Sandy Bridge HiZ and stencil over to a new scheme that lays out the non-zero miplevels horizontally below LOD0. This way they can all have the same qpitch without interfering with each other. Technically, the miplevels still overlap, but things are spaced out enough that each page is only in the "written area" of one LOD. Cc: "17.0 17.1" <mesa-stable@lists.freedesktop.org> Reviewed-by: Topi Pohjolainen <topi.pohjolainen@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.