glGetSubroutineIndex - retrieve the index of a subroutine uniform of a given
shader stage within a program
const GLchar *name);
Specifies the name of the program containing shader
Specifies the shader stage from which to query for
subroutine uniform index. shadertype must be one of
GL_TESS_EVALUATION_SHADER, GL_GEOMETRY_SHADER or
Specifies the name of the subroutine uniform whose index
glGetSubroutineIndex returns the index of a subroutine uniform within a
shader stage attached to a program object. program contains the name of
the program to which the shader is attached. shadertype specifies the
stage from which to query shader subroutine index. name contains the
null-terminated name of the subroutine uniform whose name to query.
If name is not the name of a subroutine uniform in the
shader stage, GL_INVALID_INDEX is returned, but no error is
generated. If name is the name of a subroutine uniform in the shader
stage, a value between zero and the value of GL_ACTIVE_SUBROUTINES
minus one will be returned. Subroutine indices are assigned using
consecutive integers in the range from zero to the value of
GL_ACTIVE_SUBROUTINES minus one for the shader stage.
GL_INVALID_ENUM is generated if shadertype or pname is not
one of the accepted values.
GL_INVALID_VALUE is generated if program is not the
name of an existing program object.
Copyright © 2010-2014 Khronos Group. This material may be distributed
subject to the terms and conditions set forth in the Open Publication License,
v 1.0, 8 June 1999. http://opencontent.org/openpub/.
Copyright © 2010-2014 Khronos Group.
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