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Python Computer Graphics Kit |  |
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Python Computer Graphics Kit | |
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This module can be used to extract the parameters of an OpenGL 2 shader from the shader source file.
| shader, cpp=None, cpperrstream=sys.stderr) |
The argument shader is either the name of the shader source file or a
file-like object that provides the shader sources. cpp determines how
the shader source is preprocessed. It can either be a string
containing the name of an external preprocessor tool (such as 'cpp')
that must take the file name as parameter and dump the preprocessed
output to stdout or it can be a callable that takes shader and
cpperrstream as input and returns the preprocessed sources as a
string. If the external preprocessor does not produce any data a
PreprocessorNotFound exception is thrown. The error stream of the
preprocessor is written to the object that is specified by
cpperrstream which must have a write() method. If cpperrstream is
None, the error stream is ignored.
If cpp is None a simple internal preprocessor based on the simplecpp module is used.
The function returns three lists (uniform, attribute, varying) that contain the variables with the corresponding qualifier.
A uniform variable is a 5-tuple (type, identifier, arraysize,
structname, struct). arraysize is a string containing
the expression for the length of the array (i.e. the value between the
square brackets). If the variable is no array, arraysize is
None. When the variable is a struct, type has the value
'struct'. In this case, the struct is given in struct (which is
itself a list of variables as 5-tuples). If the struct has a name,
this name is given in structname, otherwise structname is
None.
An attribute variable is a 2-tuple (type, identifier) and a varying variable is a 3-tuple (type, identifier, arraysize) where arraysize is defined as in the uniform case.
The module defines the following exception class:
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Python Computer Graphics Kit | |
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