glGetUniformSubroutine.3G man page

glGetUniformSubroutine — retrieve the value of a subroutine uniform of a given shader stage of the current program

C Specification

void glGetUniformSubroutineuiv(GLenum shadertype, GLint location, GLuint *values);

Parameters

shadertype

Specifies 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_SHADER or GL_FRAGMENT_SHADER.

location

Specifies the location of the subroutine uniform.

values

Specifies the address of a variable to receive the value or values of the subroutine uniform.

Description

glGetUniformSubroutine retrieves the value of the subroutine uniform at location location for shader stage shadertype of the current program. location must be less than the value of GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS for the shader currently in use at shader stage shadertype. The value of the subroutine uniform is returned in values.

Errors

GL_INVALID_ENUM is generated if shadertype is not one of the accepted values.

GL_INVALID_VALUE is generated if location is greater than or equal to the value of GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS for the shader currently in use at shader stage shadertype.

GL_INVALID_OPERATION is generated if no program is active.

See Also

glGetProgram(), glGetActiveSubroutineUniform(), glGetActiveSubroutineUniformName(), glGetUniformLocation()

Info

02/04/2016 [FIXME: source] [FIXME: manual]