Paul Berry
e79e6c5911
When a geometry shader is present, the fragment shader gl_PrimitiveID input acts like an ordinary varying, receiving data from the gs gl_PrimitiveID output. When there's no geometry shader, we have to ask the fixed function SF hardware to provide the primitive ID to the fragment shader instead. Previously, the SF setup code would handle this situation by recognizing that the FS gl_PrimitiveID input didn't match to any VS output; since normally an FS input with no corresponding VS output leads to undefined data, the SF setup code used to just arbitrarily assign it to receive data from attribute 0. This patch changes the SF setup code so that instead of arbitrarily using attribute 0, it assigns the unmatched FS input to receive gl_PrimitiveID. In the case where the FS input really is gl_PrimitiveID, this produces the intended result. In all other cases, no harm is done since GL specifies that the behaviour is undefined. Fixes piglit test primitive-id-no-gs. v2: If an attribute is already being overridden with point coordinates, don't try to also override it with gl_PrimitiveID. This is necessary to avoid regressing piglit tests such as shaders/glsl-fs-pointcoord. Reviewed-by: Eric Anholt <eric@anholt.net>
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. 1) install python 2.7 2) install scons (latest) 3) install mingw, flex, and bison 4) install libxml2 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get libxml2-python-2.9.1.win-amd64-py2.7.exe 5) install pywin32 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get pywin32-218.4.win-amd64-py2.7.exe 6) install git 7) download mesa from git see http://www.mesa3d.org/repository.html 8) 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.