retrieve the location of a subroutine uniform of a given shader stage within a program
$programSpecifies the name of the program containing shader stage.
$shadertypeSpecifies the shader stage from which to query for subroutine uniform index. shadertype must be one of
GL_VERTEX_SHADER, GL_TESS_CONTROL_SHADER, GL_TESS_EVALUATION_SHADER, GL_GEOMETRY_SHADERor GL_FRAGMENT_SHADER.
$nameSpecifies the name of the subroutine uniform whose index to query.
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