README
1glcpp -- GLSL "C" preprocessor
2
3This is a simple preprocessor designed to provide the preprocessing
4needs of the GLSL language. The requirements for this preprocessor are
5specified in the GLSL 1.30 specification availble from:
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7http://www.opengl.org/registry/doc/GLSLangSpec.Full.1.30.10.pdf
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9This specification is not precise on some semantics, (for example,
10#define and #if), defining these merely "as is standard for C++
11preprocessors". To fill in these details, I've been using a draft of
12the C99 standard as available from:
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14http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf
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16Any downstream compiler accepting output from glcpp should be prepared
17to encounter and deal with the following preprocessor macros:
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19 #line
20 #pragma
21 #extension
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23All other macros will be handles according to the GLSL specification
24and will not appear in the output.
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26Known limitations
27-----------------
28The __LINE__ and __FILE__ macros are not yet supported.
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30A file that ends with a function-like macro name as the last
31non-whitespace token will result in a parse error, (where it should be
32passed through as is).