Kenneth Graunke
d86efc075e
Commit33599433c7began setting the texture swizzle mode to XYZ1 for RED, RG, and RGB textures in order to force alpha to 1.0 in case we actually stored the texture as RGBA. This had a unforseen performance implication: the shader precompile assumes that the texture swizzle mode will be XYZW for non-shadow sampler types. By setting it to XYZ1, this means every shader used with a RED, RG, or RGB texture has to be recompiled. This is a very common case. Unfortunately, there's no way to improve the precompile, since RGBA textures still need XYZW, and there's no way to know by looking at the shader source what texture formats might be used. However, we only need to smash alpha to 1.0 if the texture's memory format actually has alpha bits. If not, the sampler already returns 1.0 for us without any special swizzling. XRGB8888, for example, is a very common case where this occurs. This partially fixes a performance regression since commit33599433c7. More work is required to fully fix it in all cases. This at least helps Warsow. NOTE: This is a candidate for the 9.1 branch. Reviewed-by: Carl Worth <cworth@cworth.org> Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
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.