spec - OpenGL

2.3. GL COMMAND SYNTAX 14
Type Descriptor
b
s
i
i64
f
d
ub
us
ui
ui64
Corresponding GL Type
byte
short
int
int64
float
double
ubyte
ushort
uint
uint64
Table 2.1: Correspondence of command suffix type descriptors to GL argument
types. Refer to table 2.2 for definitions of the GL types.
and
void GetFloatv( enum value, float *data );
These examples show the ANSI C declarations for these commands. In general,
a command declaration has the form 3
rtype Name{ɛ1234}{ɛ b s i i64 f d ub us ui ui64}{ɛv}
( [args ,] T arg1 , . . . , T argN [, args] );
rtype is the return type of the function. The braces ({}) enclose a series of type
descriptors (see table 2.1), of which one is selected. ɛ indicates no type descriptor.
The arguments enclosed in brackets ([args ,] and [, args]) may or may not be
present. The N arguments arg1 through argN have type T, which corresponds to
one of the type descriptors indicated in table 2.1 (if there are no letters, then the
arguments’ type is given explicitly). If the final character is not v, then N is given
by the digit 1, 2, 3, or 4 (if there is no digit, then the number of arguments is fixed).
If the final character is v, then only arg1 is present and it is an array of N values of
the indicated type.
For example,
void Uniform{1234}{if}( int location, T value );
3 The declarations shown in this document apply to ANSI C. Languages such as C++ and Ada
that allow passing of argument type information admit simpler declarations and fewer entry points.
OpenGL 4.2 (Compatibility Profile) - August 22, 2011