ScreenGLProcfunction

Gets the address of an OpenGL procedure

Syntax

Declare Function ScreenGLProc ( ByRef procname As Const String ) As Any Ptr

Parameters

Name		Description
`procname`		name of the procedure to retrieve the address of

Description

This function can be used to get the address of any OpenGL procedure, to be used to retrieve the pointers to new functions associated with OpenGL extensions. If given procedure named procname cannot be found, ScreenGLProc will return NULL (0).

Remarks

Dialect Differences

Not available in the -lang qb dialect unless referenced with the alias __Screenglproc.

Platform Differences

Not available for DOS target.

Differences from QB

New to FreeBASIC

Example

'' include fbgfx.bi for some useful definitions

#include "fbgfx.bi"



Dim SwapInterval As Function(ByVal interval As Integer) As Integer

Dim extensions As String



'' Setup OpenGL and retrieve supported extensions

ScreenRes 640, 480, 32,, FB.GFX_OPENGL

ScreenControl FB.GET_GL_EXTENSIONS, extensions



If (InStr(extensions, "WGL_EXT_swap_control") <> 0) Then

    '' extension supported, retrieve proc address

    SwapInterval = ScreenGLProc("wglSwapIntervalEXT")

    If (SwapInterval <> 0) Then

        '' Ok, we got it. Set OpenGL to wait for vertical sync on buffer swaps

        SwapInterval(1)

    End If

End If

Reference

Documented in KeyPgScreenglproc.html