[Gambas-user] Using OpenGL without SDL Draw event

[Kevin Fishburne]

This is tangent to the thread "sdl Draw event overhead is killing frame 
rate".

When rendering graphics with OpenGL using SDL for window management, you 
define a screen like this:

Public Screen As New Window As "Screen"
   With Screen
     .FullScreen = False
     .Width = 1
     .Height = 1
     .Framerate = 0
     .Show()
   End With

When Screen's .Show method is executed the Screen's Draw event procedure 
(Screen_Draw) begins executing continuously. As discussed in the 
previous thread it is extremely slow, even if practically empty and 
drawing nothing.

Is there a way to define a Screen/Window to be used as a render target 
for OpenGL that does not use SDL? I'm experimenting with gb.qt4.opengl 
now but am having some trouble. I've attached the project, which dies 
with signal 11 upon executing the line "Glu.Build2DMipmaps(TextureImage)"

I actually just created a form and then a GLArea so I think I'm on the 
right track, but am not sure where to go from there. I think this is how 
I did things years ago before moving to SDL, though without OpenGL.

-- 
Kevin Fishburne
Eight Virtues
www: http://sales.eightvirtues.com
e-mail: sales at ...1887...
phone: (770) 853-6271

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