Retrieve the location of a subroutine uniform of a given shader stage within a program.
||-||Specifies the name of the program containing shader stage.|
||-||Specifies the shader stage from which to query for subroutine uniform index. |
||-||Specifies the name of the subroutine uniform whose index to query.|
glGetSubroutineUniformLocation returns the location of the subroutine uniform variable
name in the shader stage of type
shadertype attached to
program , with behavior otherwise identical to glGetUniformLocation .
name is not the name of a subroutine uniform in the shader stage, -1 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_SUBROUTINE_LOCATIONS minus one will be returned. Subroutine locations are assigned using consecutive integers in the range from zero to the value of
GL_ACTIVE_SUBROUTINE_LOCATIONS minus one for the shader stage. For active subroutine uniforms declared as arrays, the declared array elements are assigned consecutive locations.
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.
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