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GLSL ES spec includes the following:
"It is an error to undefine or to redefine a built-in
(pre-defined) macro name."
But desktop GLSL doesn't. This has sparked some discussion
in Khronos, and the final conclusion was to update the
GLSL 4.50 spec to include the following:
"By convention, all macro names containing two consecutive
underscores ( __ ) are reserved for use by underlying
software layers. Defining or undefining such a name in a
shader does not itself result in an error, but may result
in unintended behaviors that stem from having multiple
definitions of the same name. All macro names prefixed
with “GL_” (“GL” followed by a single underscore) are also
reserved, and defining or undefining such a name results in
a compile-time error."
In other words, undefining GL_* names should be an error, but
undefining other names with a double underscore in them is
not strictly prohibited in desktop GLSL.
This patch fixes the preprocessor to apply these rules,
following exactly the implementation already present
in GLSLang. This fixes some tests in CTS.
Khronos bug:
https://cvs.khronos.org/bugzilla/show_bug.cgi?id=16003
Fixes:
KHR-GL45.shaders.preprocessor.definitions.undefine_core_profile_vertex
KHR-GL45.shaders.preprocessor.definitions.undefine_core_profile_fragment
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.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 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.