Checking for OpenGL Extensions using Glew

BlitzMax Forums/BlitzMax Programming/Checking for OpenGL Extensions using Glew

Difference

(Posted 2006) [#1]

Does somebody know how I, *USING GLEW* (*not by getting the extentions string*), check if an OpenGL extention is available?

This http://glew.sourceforge.net/basic.html suggests, that there are globals I can check.

For example, how do I see if Glew loaded glActiveTextureARB ?

Thanks in advance.

Difference

(Posted 2006) [#2]

Anybody? BLR perhaps?

In addition: How do I see what version of Glew Bmax is using?

fredborg

(Posted 2006) [#3]

Like this:

Import pub.glew

SetGraphicsDriver GLMax2DDriver()
Graphics 640,480,0,0

glewInit()

If (GL_ARB_vertex_program)
	Print "Yepa!"
EndIf
If (GL_VERSION_1_1)
	Print "GLEW_VERSION_1_1"
EndIf
If (GL_VERSION_1_2)
	Print "GLEW_VERSION_1_2"
EndIf
If (GL_VERSION_1_3)
	Print "GLEW_VERSION_1_3"
EndIf
If (GL_VERSION_1_4)
	Print "GLEW_VERSION_1_4"
EndIf
If (GL_VERSION_1_5)
	Print "GLEW_VERSION_1_5"
EndIf
If (GL_VERSION_2_0)
	Print "GLEW_VERSION_2_0"
EndIf

Just replace the GLEW with GL

Added GLEW_VERSION_X_X check...

Difference

(Posted 2006) [#4]

Thanks fredborg!

There does not seem to be a global for glActiveTextureARB , so I think the right way is: (added gl_1.4 to 2.0 )

		glewInit() ' required for glActiveTextureARB

		If (GL_VERSION_1_3 | GL_VERSION_1_3 | GL_VERSION_1_4 | GL_VERSION_1_5 | GL_VERSION_2_0)
			Notify "OpenGL 1.3 or better present"
			multitexturePresent = True
		ElseIf (GL_ARB_multitexture)
			multitexturePresent = True
			Notify "GL_ARB_multitexture OK"
		Else
			Notify "GL_ARB_multitexture MISSING!"		
		EndIf