glGetProgramInterface man page on RedHat
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GLGETPROGRAMINTERFAC(3G) OpenGL Manual GLGETPROGRAMINTERFAC(3G)
NAME
glGetProgramInterface - query a property of an interface in a program
C SPECIFICATION
void glGetProgramInterfaceiv(GLuint program, GLenum programInterface,
GLenum pname, GLint * params);
PARAMETERS
program
The name of a program object whose interface to query.
programInterface
A token identifying the interface within program to query.
pname
The name of the parameter within programInterface to query.
params
The address of a variable to retrieve the value of pname for the
program interface.
DESCRIPTION
glGetProgramInterfaceiv queries the property of the interface identifed
by programInterface in program, the property name of which is given by
pname.
program must be the name of an existing program object.
programInterface is the name of the interface within program to query
and must be one of the following values:
GL_UNIFORM
The query is targeted at the set of active uniforms within program.
GL_UNIFORM_BLOCK
The query is targeted at the set of active uniform blocks within
program.
GL_ATOMIC_COUNTER_BUFFER
The query is targeted at the set of active atomic counter buffer
binding points within program.
GL_PROGRAM_INPUT
The query is targeted at the set of active input variables used by
the first shader stage of program. If program contains multiple
shader stages then input variables from any stage other than the
first will not be enumerated.
GL_PROGRAM_OUTPUT
The query is targeted at the set of active output variables
produced by the last shader stage of program. If program contains
multiple shader stages then output variables from any stage other
than the last will not be enumerated.
GL_VERTEX_SUBROUTINE, GL_TESS_CONTROL_SUBROUTINE,
GL_TESS_EVALUATION_SUBROUTINE, GL_GEOMETRY_SUBROUTINE,
GL_FRAGMENT_SUBROUTINE, GL_COMPUTE_SUBROUTINE
,
,
,
,
,
The query is targeted at the set of active
subroutines for the vertex, tessellation control, tessellation
evaluation, geometry, fragment and compute shader stages of
program, respectively.
GL_VERTEX_SUBROUTINE_UNIFORM, GL_TESS_CONTROL_SUBROUTINE_UNIFORM,
GL_TESS_EVALUATION_SUBROUTINE_UNIFORM, GL_GEOMETRY_SUBROUTINE_UNIFORM,
GL_FRAGMENT_SUBROUTINE_UNIFORM, GL_COMPUTE_SUBROUTINE_UNIFORM
,
,
,
,
,
The query is targeted at the set of active
subroutine uniform variables used by the vertex, tessellation
control, tessellation evaluation, geometry, fragment and compute
shader stages of program, respectively.
GL_TRANSFORM_FEEDBACK_VARYING
The query is targeted at the set of output variables from the last
non-fragment stage of program that would be captured if transform
feedback were active.
GL_BUFFER_VARIABLE
The query is targeted at the set of active buffer variables used by
program.
GL_SHADER_STORAGE_BLOCK
The query is targeted at the set of active shader storage blocks
used by program.
pname identifies the property of programInterface to return in params.
If pname is GL_ACTIVE_RESOURCES, the value returned is the number of
resources in the active resource list for programInterface. If the list
of active resources for programInterface is empty, zero is returned.
If pname is GL_MAX_NAME_LENGTH, the value returned is the length of the
longest active name string for an active resource in programInterface.
This length includes an extra character for the null terminator. If the
list of active resources for programInterface is empty, zero is
returned. It is an error to specify GL_MAX_NAME_LENGTH when
programInterface is GL_ATOMIC_COUNTER_BUFFER, as active atomic counter
buffer resources are not assigned name strings.
If pname is GL_MAX_NUM_ACTIVE_VARIABLES, the value returned is the
number of active variables belonging to the interface block or atomic
counter buffer resource in programInterface with the most active
variables. If the list of active resources for programInterface is
empty, zero is returned. When pname is GL_MAX_NUM_ACTIVE_VARIABLES,
programInterface must be GL_UNIFORM_BLOCK, GL_ATOMIC_COUNTER_BUFFER, or
GL_SHADER_STORAGE_BLOCK.
If pname is GL_MAX_NUM_COMPATIBLE_SUBROUTINES, the value returned is
the number of compatible subroutines belonging to the active subroutine
uniform in programInterface with the most compatible subroutines. If
the list of active resources for programInterface is empty, zero is
returned. When pname is GL_MAX_NUM_COMPATIBLE_SUBROUTINES,
programInterface must be one of GL_VERTEX_SUBROUTINE_UNIFORM,
GL_TESS_CONTROL_SUBROUTINE_UNIFORM,
GL_TESS_EVALUATION_SUBROUTINE_UNIFORM, GL_GEOMETRY_SUBROUTINE_UNIFORM,
GL_FRAGMENT_SUBROUTINE_UNIFORM, or GL_COMPUTE_SUBROUTINE_UNIFORM.
ERRORS
GL_INVALID_ENUM is generated if identifier is not one of the accepted
object types.
GL_INVALID_VALUE is generated if program is not the name of an existing
sync object.
GL_INVALID_VALUE is generated if bufSize is zero.
If not NULL, length and label should be addresses to which the client
has write access, otherwise undefined behavior, including process
termination may occur.
ASSOCIATED GETS
glGet() with argument GL_MAX_LABEL_LENGTH.
SEE ALSO
glPushDebugGroup(), glPopDebugGroup(), glObjectLabel(),
glGetObjectLabel().
COPYRIGHT
Copyright © 2012 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 GLGETPROGRAMINTERFAC(3G)
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