mirror of
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2a18d1950c
This reverts commit d3df641f0a.
The original commit had sat unpushed on my machine for months. By the
time I found it again, I had forgotten that we had decided not to use
this change after all, (the relevant test was removed long ago).
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1.1 KiB
Text
32 lines
No EOL
1.1 KiB
Text
glcpp -- GLSL "C" preprocessor
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This is a simple preprocessor designed to provide the preprocessing
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needs of the GLSL language. The requirements for this preprocessor are
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specified in the GLSL 1.30 specification availble from:
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http://www.opengl.org/registry/doc/GLSLangSpec.Full.1.30.10.pdf
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This specification is not precise on some semantics, (for example,
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#define and #if), defining these merely "as is standard for C++
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preprocessors". To fill in these details, I've been using a draft of
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the C99 standard as available from:
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http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf
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Any downstream compiler accepting output from glcpp should be prepared
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to encounter and deal with the following preprocessor macros:
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#line
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#pragma
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#extension
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All other macros will be handles according to the GLSL specification
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and will not appear in the output.
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Known limitations
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-----------------
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The __LINE__ and __FILE__ macros are not yet supported.
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A file that ends with a function-like macro name as the last
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non-whitespace token will result in a parse error, (where it should be
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passed through as is). |