glGetProgramStage man page on RedHat
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GLGETPROGRAMSTAGE(3G) OpenGL Manual GLGETPROGRAMSTAGE(3G)
NAME
glGetProgramStage - retrieve properties of a program object
corresponding to a specified shader stage
C SPECIFICATION
void glGetProgramStageiv(GLuint program, GLenum shadertype,
GLenum pname, GLint *values);
PARAMETERS
program
Specifies the name of the program containing shader stage.
shadertype
Specifies the shader stage from which to query for the subroutine
parameter. shadertype must be one of GL_VERTEX_SHADER,
GL_TESS_CONTROL_SHADER, GL_TESS_EVALUATION_SHADER,
GL_GEOMETRY_SHADER or GL_FRAGMENT_SHADER.
pname
Specifies the parameter of the shader to query. pname must be
GL_ACTIVE_SUBROUTINE_UNIFORMS,
GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS, GL_ACTIVE_SUBROUTINES,
GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH, or
GL_ACTIVE_SUBROUTINE_MAX_LENGTH.
values
Specifies the address of a variable into which the queried value or
values will be placed.
DESCRIPTION
glGetProgramStage queries a parameter of 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
the parameter. pname specifies which parameter should be queried. The
value or values of the parameter to be queried is returned in the
variable whose address is given in values.
If pname is GL_ACTIVE_SUBROUTINE_UNIFORMS, the number of active
subroutine variables in the stage is returned in values.
If pname is GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS, the number of
active subroutine variable locations in the stage is returned in
values.
If pname is GL_ACTIVE_SUBROUTINES, the number of active subroutines in
the stage is returned in values.
If pname is GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH, the length of the
longest subroutine uniform for the stage is returned in values.
If pname is GL_ACTIVE_SUBROUTINE_MAX_LENGTH, the length of the longest
subroutine name for the stage is returned in values. The returned name
length includes space for the null-terminator.
If there is no shader present of type shadertype, the returned value
will be consistent with a shader containing no subroutines or
subroutine uniforms.
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()
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 GLGETPROGRAMSTAGE(3G)
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