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We originally thought that GL 3.0 required GL_DEPTH_COMPONENT16 to map exactly to Z16. However, we misread the specification, thanks in part to LaTeX reordering the tables in the PDF. Page 180 of the GL 3.0 specification (glspec30.20080923.pdf) says: "[...] memory allocation per texture component is assigned by the GL to match the allocations listed in tables 3.16-3.18 as closely as possible. [...] Required Texture Formats [...] In addition, implementations are required to support the following sized internal formats. Requesting one of these internal formats for any texture type will allocate exactly the internal component sizes and types shown for that format in tables 3.16-3.17:" Notably, however, GL_DEPTH_COMPONENT16 does /not/ appear in table 3.16 or table 3.17. It appears in table 3.18, where the "exact" rule doesn't apply, and it falls back to the "closely as possible" rule. The confusing part is that the ordering of the tables in the PDF is: Table 3.16 (pages 182-184) Table 3.18 (bottom of page 184 to top of 185) Table 3.17 (page 185) Presumably, people saw table 3.16, then saw the table immediately following with DEPTH_COMPONENT* formats, and assumed it was 3.17. Based on a patch by Chia-I Wu, but without the driconf option to force Z16 to be used. It's not required, and there's apparently no benefit to actually using it. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Matt Turner <mattst88@gmail.com> Reviewed-by: Chia-I Wu <olv@lunarg.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 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. 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 http://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.