glGetSubroutineUniformLocation man page on RedHat
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GLGETSUBROUTINEUNIFO(3G) OpenGL Manual GLGETSUBROUTINEUNIFO(3G)
NAME
glGetSubroutineUniformLocation - retrieve the location of a subroutine
uniform of a given shader stage within a program
C SPECIFICATION
GLint glGetSubroutineUniformLocation(GLuint program, GLenum shadertype,
const GLchar *name);
PARAMETERS
program
Specifies the name of the program containing shader stage.
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.
name
Specifies the name of the subroutine uniform whose index to query.
DESCRIPTION
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().
If 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.
ERRORS
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.
SEE ALSO
glGetProgram(), glGetActiveSubroutineUniform(),
glGetActiveSubroutineUniformName(), glGetUniformLocation()
COPYRIGHT
Copyright © 2010 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/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLGETSUBROUTINEUNIFO(3G)
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