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Since Gen6+ stencil buffers use W-tiling (a tiling arrangement which drm and the kernel are not aware of) we need to round up the width and height of a stencil buffer to multiples of the W-tile size (64x64) before allocating a stencil buffer. Previously, we rounded up the size of the base miplevel, and then computed the miptree layout based on the rounded up size. This was incorrect, because it meant that the total size of the miptree would not be properly W-tile aligned, and therefore we would not always allocate enough pages. (Note: even though the GL API doesn't allow creation of mipmapped stencil textures, it does allow mipmapping of a combined depth/stencil texture, and on Gen6+, a combined depth/stencil texture is internally implemented as a pair of separate depth and stencil buffers.) For example, on Sandy Bridge, when allocating a mipmapped stencil texture of size 128x128, we would first round up to the nearest multiple of 64x64 (causing no change to the size), and then compute the miptree layout (whose size worked out to 128x196). Then we would request an allocation of 128*196 bytes (6.125 pages), causing 7 pages to be allocated to the texture. However, the texture needs 8 pages, since each W-tile occupies a page, and it takes 2 W-tiles to cover a width of 128 and 4 W-tiles to cover a height of 196. This patch changes the order of operations so that the miptree layout is computed first and then the total size of the miptree is rounded up to be W-tile aligned. NOTE: This is a candidate for stable release branches. Reviewed-by: Eric Anholt <eric@anholt.net> |
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File: docs/README.WIN32 Last updated: 23 April 2011 Quick Start ----- ----- Windows drivers are build with SCons. Makefiles or Visual Studio projects are no longer shipped or supported. Run scons osmesa mesagdi to build classic mesa Windows GDI drivers; or 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. 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.