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Paul's original code had emit_control_data_bits() skip the URB write if vertex_count was 0. This meant wrapping every control data write in a conditional write. We accumulate control data bits in a single UD (32-bit) register. For simple shaders that don't emit many vertices, the control data header will be <= 32-bits long, so we only need to write it once at the end of the shader. For shaders with larger headers, we write out batches of control data bits at EmitVertex(), when (vertex_count * bits_per_vertex) % 32 == 0. On the first EmitVertex() call, the above expression will evaluate to true simply because vertex_count == 0. But we want to avoid emitting the control data bits, because we haven't accumulated 32-bits worth yet. In other words, the vertex_count != 0 check is really only necessary in the EmitVertex() batching case, not the end-of-thread case. This saves a CMP/IF/ENDIF in every shader that uses EndPrimitive() or multiple streams. The only downside is that a shader which emits no vertices at all will execute an additional URB write---but such shaders are pointless and not worth optimizing. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Matt Turner <mattst88@gmail.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 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.