MaxGui Canvas and GLMax2D

I wand to set the MaxGui Canvas in the mode of GLMax2D so I can use OpenGL commands to draw.

Well i think you just set the graphics driver before you create the canvas (what i did below). Below i mixed your gltexturedtriangle thingy:

SuperStrict

Global textureGL	: Int
Global imagen	: TImage

Local filter:String="Image Files:png,jpg,bmp;Text Files:txt;All Files:*"
Local FileName:String =RequestFile( "Select graphic file to open",filter$ )
If FileName = Null Then End

SetGraphicsDriver GLMax2DDriver()

Global myWindow:TGadget = CreateWindow("Full screen", 0, 0, ClientWidth(Desktop()), ClientHeight(Desktop()), Null)
MaximizeWindow(myWindow)

Global myCanvas:TGadget = CreateCanvas(0, 0, ClientWidth(myWindow), ClientHeight(myWindow), myWindow)
SetGadgetLayout(myCanvas, 1, 1, 1, 1)

' Canvas 'rules'
SetGraphics(CanvasGraphics(myCanvas))
SetMaskColor 255, 0, 255
imagen = LoadImage(FileName)
textureGL% = GLTexFromPixmap%(LoadPixmap:TPixmap(FileName))

Global myButton:TGadget = CreateButton("Exit", (ClientWidth(myCanvas) / 2) - (75), (ClientHeight(myCanvas) / 2) - 20, 150, 40, myCanvas)

Global myTimer:TTimer = CreateTimer(60)

While True
	
	WaitEvent()
	
	Local event:TEvent = CurrentEvent
	
	Select event.id
	
		Case EVENT_WINDOWCLOSE
			End
		
		Case EVENT_GADGETACTION
			If event.source = myButton Then End
		
		Case EVENT_TIMERTICK
			RedrawGadget(myCanvas)
			
		Case EVENT_GADGETPAINT
			If event.source = myCanvas Then 
				Update(myCanvas)
				Render(myCanvas)
			EndIf
	
	End Select
	
Wend

Function Render(_canvas:TGadget)
	
	SetGraphics(CanvasGraphics(_canvas))
	
	Cls

	SetColor 0, 255, 0
	DrawRect 0, 0, GraphicsWidth(), 5
	DrawRect 0, 0, 5, GraphicsHeight()
	DrawRect 0, GraphicsHeight() - 5, GraphicsWidth(), 5
	DrawRect GraphicsWidth() - 5, 0, 5, GraphicsHeight()

	SetColor 255, 0, 0
	DrawRect(GraphicsWidth() - 105, GraphicsHeight() - 105, 100, 100) 
	
	SetColor 0, 0, 255
	DrawRect(5, 5, 100, 100)
	
	SetColor 255, 255, 255
	DrawRect(GraphicsWidth() - 5 - 100, 5, 100, 100)
	DrawRect(5, GraphicsHeight() - 5 - 100, 100, 100)
	
	If (TextureGL%)
		glBindTexture(GL_TEXTURE_2D,TextureGL%)
		glEnable(GL_TEXTURE_2D)
	EndIf
	glBegin GL_TRIANGLES
		glTexCoord2f 0.0 , 0.0
		glVertex2f 0.0 , 0.0
		
		glTexCoord2f 1.0 , 0.0
		glVertex2f GraphicsWidth() , 0.0
		
		glTexCoord2f 1.0 , 1.0
		glVertex2f GraphicsWidth() , GraphicsHeight()
	glEnd

	
	Flip
	
End Function 

Function Update(_canvas:TGadget)
	
	SetGraphics(CanvasGraphics(_canvas))
	
End Function

Thanks.