glGetSubroutineIndex — retrieve the index of a subroutine uniform of a given shader stage within a program
| ||GLuint program,|
|const GLchar *name |
Specifies the name of the program containing shader stage.
Specifies the shader stage from which to query for subroutine uniform index.
shadertype must be one of
Specifies the name of the subroutine uniform whose index to query.
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.
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
pname is not one of the accepted values.
GL_INVALID_VALUE is generated if
program is not the name of an existing program object.
|Function / Feature Name||2.0||2.1||3.0||3.1||3.2||3.3||4.0||4.1||4.2||4.3||4.4||4.5|
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/.