[Bf-committers] OSX vpaint bug

[Ton Roosendaal]

Hi,

I've pinned down the problem, and it still doesn't look good.

- AglSwapbuffers() doesn't swap or switch buffers (as its definition  
says) but copies the backbuffer to the front, leaving the backbuffer  
unaltered.
- I tried the option AGL_BACKING_STORE when creating an opengl  
window... didn't help

- when calling glDrawBuffer(GL_FRONT) and glFlush(), the backbuffer  
gets swapped to the front. (this causes the flashing while  
vertexpainting)

The BF got 'premier support' from Apple, so I've mailed them about it.  
I also like to get feedback from OSX coders here... anyone has a clue?  
It might well be the way a window is created, or some OpenGL global  
setting I'm not aware of.

Alternatively, an opengl-compatible selection routine can be used of  
course. Using the backbuffer for peeking color-codes is not really a  
good method... for this either an off-screen opengl buffer should be  
used, or the builtin opengl selection methods. I'll look into both.

-Ton-

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Ton Roosendaal  Blender Foundation ton@blender.org  
http://www.blender.org