fsleyes.gl.shaders

The shaders package contains classes and functions for finding, parsing, compiling, and managing OpenGL shader programs. Two types of shader program are supported:

• GLSL 1.20 vertex and fragment shaders.

• ARB_vertex_program and ARB_fragment_program shader programs.

The glsl and arbp packages respectively define the GLSLShader and ARBPShader classes, which may be used to manage shader programs of the corresponding type.

Some package-level functions are defined here, for finding and loading shader source code:

getShaderDir	Returns the directory in which the ARB and glsl shader program source files can be found.
getShaderSuffix	Returns the shader program file suffix to use.
getVertexShader	Returns the vertex shader source for the given GL type (e.g.
getFragmentShader	Returns the fragment shader source for the given GL type.

fsleyes.gl.shaders.getShaderDir()

Returns the directory in which the ARB and glsl shader program source files can be found. A different directory will be returned depending on which OpenGL version is in use.

fsleyes.gl.shaders.getShaderSuffix()

Returns the shader program file suffix to use. A different suffix will be returned depending on which OpenGL version is in use.

fsleyes.gl.shaders.getVertexShader(prefix)

Returns the vertex shader source for the given GL type (e.g. ‘glvolume’).

fsleyes.gl.shaders.getFragmentShader(prefix)

Returns the fragment shader source for the given GL type.

fsleyes.gl.shaders._getShader(prefix, shaderType)

Returns the shader source for the given GL type and the given shader type (‘vert’ or ‘frag’).

fsleyes.gl.shaders._getFileName(prefix, shaderType)

Returns the file name of the shader program for the given GL type and shader type.

fsleyes.gl.shaders.preprocess(src)

‘Preprocess’ the given shader source.

This amounts to searching for lines containing ‘#pragma include filename’, and replacing those lines with the contents of the specified files.