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mesa/src/compiler/glsl/glcpp
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Ian Romanick 50b49d242d glcpp: Only disallow #undef of pre-defined macros on GLSL ES >= 3.00 shaders 
Section 3.4 (Preprocessor) of the GLSL ES 3.00 spec says:

   It is an error to undefine or to redefine a built-in (pre-defined)
   macro name.

The GLSL ES 1.00 spec does not contain this text.

Section 3.3 (Preprocessor) of the GLSL 1.30 spec says:

   #define and #undef functionality are defined as is standard for C++
   preprocessors for macro definitions both with and without macro
   parameters.

At least as far as I can tell GCC allow '#undef __FILE__'.  Furthermore,
there are desktop OpenGL conformance tests that expect '#undef
__VERSION__' and '#undef GL_core_profile' to work.

Fixes:

    GL45-CTS.shaders.preprocessor.definitions.undefine_version_vertex
    GL45-CTS.shaders.preprocessor.definitions.undefine_version_fragment
    GL45-CTS.shaders.preprocessor.definitions.undefine_core_profile_vertex
    GL45-CTS.shaders.preprocessor.definitions.undefine_core_profile_fragment

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com>
Cc: mesa-stable@lists.freedesktop.org
2016-08-10 16:42:02 -07:00
..
tests glcpp: Fix locations when encounting "#<NEWLINE>". 2016-03-10 11:23:26 -08:00
.gitignore glsl: move to compiler/ 2016-01-26 16:08:33 +00:00
glcpp-lex.l glcpp: Fix locations when encounting "#<NEWLINE>". 2016-03-10 11:23:26 -08:00
glcpp-parse.y glcpp: Only disallow #undef of pre-defined macros on GLSL ES >= 3.00 shaders 2016-08-10 16:42:02 -07:00
glcpp.c glsl: reuse main extension table to appropriately restrict extensions 2016-07-23 13:48:04 -04:00
glcpp.h glcpp: Track the actual version instead of just the version_resolved flag 2016-08-10 16:42:02 -07:00
pp.c glsl: reuse main extension table to appropriately restrict extensions 2016-07-23 13:48:04 -04:00
README glsl: move to compiler/ 2016-01-26 16:08:33 +00:00

README 

glcpp -- GLSL "C" preprocessor

This is a simple preprocessor designed to provide the preprocessing
needs of the GLSL language. The requirements for this preprocessor are
specified in the GLSL 1.30 specification availble from:

http://www.opengl.org/registry/doc/GLSLangSpec.Full.1.30.10.pdf

This specification is not precise on some semantics, (for example,
#define and #if), defining these merely "as is standard for C++
preprocessors". To fill in these details, I've been using a draft of
the C99 standard as available from:

http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf

Any downstream compiler accepting output from glcpp should be prepared
to encounter and deal with the following preprocessor macros:

	#line
	#pragma
	#extension

All other macros will be handled according to the GLSL specification
and will not appear in the output.

Known limitations
-----------------
A file that ends with a function-like macro name as the last
non-whitespace token will result in a parse error, (where it should be
passed through as is).