glGetProgramResourceLocationIndex - query the fragment color index of a named
variable within a program
const char * name);
The name of a program object whose resources to
A token identifying the interface within program
containing the resource named name.
The name of the resource to query the location of.
glGetProgramResourceLocationIndex returns the fragment color index
assigned to the variable named name in interface
programInterface of program object program. program must
be the name of a program that has been linked successfully.
programInterface must be GL_PROGRAM_OUTPUT.
The value -1 will be returned if an error occurs, if name
does not identify an active variable on programInterface, or if
name identifies an active variable that does not have a valid
location assigned, as described above. The locations returned by these
commands are the same locations returned when querying the
GL_LOCATION and GL_LOCATION_INDEX resource properties.
A string provided to glGetProgramResourceLocationIndex is
considered to match an active variable if:
•the string exactly matches the name of the active
•if the string identifies the base name of an
active array, where the string would exactly match the name of the variable if
the suffix "" were appended to the string
•if the string identifies an active element of the
array, where the string ends with the concatenation of the "["
character, an integer with no "+" sign, extra leading zeroes, or
whitespace identifying an array element, and the "]" character,
the integer is less than the number of active elements of the array variable,
and where the string would exactly match the enumerated name of the array if
the decimal integer were replaced with zero.
Any other string is considered not to identify an active variable.
If the string specifies an element of an array variable,
glGetProgramResourceLocation returns the location assigned to that
element. If it specifies the base name of an array, it identifies the
resources associated with the first element of the array.
GL_INVALID_VALUE is generated if program is not the name of an
existing program object.
GL_INVALID_ENUM is generated if programInterface is
not one of the accepted interface types.
GL_INVALID_OPERATION is generated if program has not
been linked successfully.
Copyright © 2013-2014 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/.
Copyright © 2013-2014 Khronos Group
|Function / Feature Name