glGetProgramInterface — query a property of an interface in a program
| ||GLuint program,|
|GLint * params |
The name of a program object whose interface to query.
A token identifying the interface within
program to query.
The name of the parameter within
programInterface to query.
The address of a variable to retrieve the value of
pname for the program interface.
glGetProgramInterfaceiv queries the property of the interface identifed by
program, the property name of which is given by
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:
The query is targeted at the set of active uniforms within
The query is targeted at the set of active uniform blocks within
The query is targeted at the set of active atomic counter buffer binding points within
The query is targeted at the set of active input variables used by the first shader stage of
program contains multiple shader stages then input variables from any stage other than the first will not be enumerated.
The query is targeted at the set of active output variables produced by the last shader stage of
program contains multiple shader stages then output variables from any stage other than the last will not be enumerated.
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.
The query is targeted at the set of active buffer variables used by
The query is targeted at the set of active shader storage blocks used by
The query is targeted at the set of active buffer binding points to which output variables in the
GL_TRANSFORM_FEEDBACK_VARYING interface are written.
pname identifies the property of
programInterface to return in
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.
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_ATOMIC_COUNTER_BUFFER, as active atomic counter buffer resources are not assigned name strings.
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
programInterface must be
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 program object.
GL_INVALID_OPERATION is generated if
GL_TRANSFORM_FEEDBACK_BUFFER, since active atomic counter and transform feedback buffer resources are not assigned name strings.
GL_INVALID_OPERATION error is generated if
programInterface is not
glGet with argument
|OpenGL ES API Version|
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