An OpenGL function loader written in pure swift. To use it, import GL in your swift file.
OpenGL is a function loader which allows you to call OpenGL GPU functions from swift programs. These functions are loaded lazily at runtime by OpenGL. OpenGL also diagnoses invalid OpenGL function calls due to the function not being available on a particular GPU and OpenGL version. OpenGL can load any OpenGL function up to OpenGL 4.5.
OpenGL works on Linux; it’s untested on Mac OSX, but there is no reason it shouldn’t work.
OpenGL provides access to OpenGL functions both with labeled and unlabeled arguments. This can help you avoid common argument ordering bugs.
glClearColor(0.15, 0.15, 0.15, 1)
glClearColor(red: 0.15, green: 0.15, blue: 0.15, alpha: 1)The function names are the same as the OpenGL C specification, and the argument labels are the same as the parameter names in the C specification, with two exceptions: `in`: has been renamed to input:, and `func`: has been renamed to f: to avoid conflicts with Swift keywords.
OpenGL imports OpenGL constants under the scope GL. Unless doing so would cause the constant’s name to start with a digit, the constant’s redundant GL_ prefix is dropped.
glBlendFunc(GL.SRC_ALPHA, GL.ONE_MINUS_SRC_ALPHA)Note: The
GLscope is not the same as the module scope which is also calledGL. The fully qualified name of an OpenGL enum or an OpenGL type isGL.GL.__symbolname__. The fully qualified name of an OpenGL function is justGL.__functionname__.
All OpenGL constants are of one of the following types: GL.Enum, GL.Bitfield, or GL.UInt64. (Int32, UInt32, or UInt64, respectively.)
OpenGL provides typealias definitions for OpenGL types. The typealiases are given Swifty names, and are also scoped to GL.
var tex_id:GL.UInt = 0| OpenGL C type | OpenGL Swift typealias | OpenGL Swift type |
|---|---|---|
| GLboolean | GL.Bool | Bool |
| GLdouble | GL.Double | Double |
| GLclampd | GL.ClampDouble | Double |
| GLfloat | GL.Float | Float |
| GLclampf | GL.ClampFloat | Float |
| GLbyte | GL.Byte | Int8 |
| GLchar | GL.Char | Int8 |
| GLcharARB | GL.CharARB | Int8 |
| GLshort | GL.Short | Int16 |
| GLint | GL.Int | Int32 |
| GLsizei | GL.Size | Int32 |
| GLenum | GL.Enum | Int32 |
| GLfixed | GL.Fixed | Int32 |
| GLclampx | GL.ClampX | Int32 |
| GLint64 | GL.Int64 | Int64 |
| GLint64EXT | GL.Int64EXT | Int64 |
| GLintptr | GL.IntPointer | Int |
| GLintptrARB | GL.IntPointerARB | Int |
| GLsizeiptr | GL.SizePointer | Int |
| GLsizeiptrARB | GL.SizePointerARB | Int |
| GLvdpauSurfaceNV | GL.VdpauSurfaceNV | Int |
| GLubyte | GL.UByte | UInt8 |
| GLushort | GL.UShort | UInt16 |
| GLhalfNV | GL.HalfNV | UInt16 |
| GLuint | GL.UInt | UInt32 |
| GLbitfield | GL.Bitfield | UInt32 |
| GLuint64 | GL.UInt64 | UInt64 |
| GLuint64EXT | GL.UInt64EXT | UInt64 |
| GLhandleARB | GL.HandleARB | UnsafeMutableRawPointer? |
| GLeglImageOES | GL.EGLImageOES | UnsafeMutableRawPointer? |
| GLsync | GL.Sync | OpaquePointer? |