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In Mesa we use the convention that if gl_renderbuffer::NumSamples or gl_texture_image::NumSamples is zero, it's a non-MSAA surface. Otherwise, it's an MSAA surface. But in gallium nr_samples=1 is a non-MSAA surface. Before, if the user called glRenderbufferStorageMultisample() or glTexImage2DMultisample() with samples=1 we skipped the search for the next higher number of supported samples and asked the gallium driver to create a surface with nr_samples=1. So we got a non-MSAA surface. This failed to meet the expection of the user making those calls. This patch changes the sample count checks in st_AllocTextureStorage() and st_renderbuffer_alloc_storage() to test for samples > 0 instead of > 1. And we now start querying for MSAA support at samples=2 since gallium has no concept of a 1x MSAA surface. A specific example of this problem is the Piglit arb_framebuffer_srgb-blit test. It calls glRenderbufferStorageMultisample() with samples=1 to request an MSAA renderbuffer with the minimum supported number of MSAA samples. Instead of creating a 4x or 8x, etc. MSAA surface, we wound up creating a non-MSAA surface. Finally, add a comment on the gl_renderbuffer::NumSamples field. There is one piglit regression with the VMware driver: ext_framebuffer_multisample-blit-mismatched-formats fails because now we're actually creating 4x MSAA surfaces (the requested sample count is 1) and we're hitting some sort of bug in the blitter code. That will have to be fixed separately. Other drivers may find regressions too now that MSAA surfaces are really being created. v2: start quering for MSAA support with samples=2 instead of 1. Reviewed-by: Roland Scheidegger <sroland@vmware.com> Reviewed-by: Marek Olšák <marek.olsak@amd.com>
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.