func uniform(id uint32, index uint32, buf []byte) (name string, datatype uint32, size int32) {
var length int32
var isize int32
var idatatype uint32
gl.GetActiveUniform(id, index, int32(len(buf)), &length, &isize, &idatatype, &buf[0])
return string(buf[:length : length+1]), idatatype, isize
}
// GetActiveUniform returns details about an active uniform variable.
// A value of 0 for index selects the first active uniform variable.
// Permissible values for index range from 0 to the number of active
// uniform variables minus 1.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetActiveUniform.xhtml
func GetActiveUniform(p Program, index uint32) (name string, size int, ty Enum) {
var length, si int32
var typ uint32
name = strings.Repeat("\x00", 256)
cname := gl.Str(name)
gl.GetActiveUniform(p.Value, uint32(index), int32(len(name)-1), &length, &si, &typ, cname)
name = name[:strings.IndexRune(name, 0)]
return name, int(si), Enum(typ)
}