[Bug 16699] OpenGL anti-aliasing capabilities of graphics driver not exposed to Google Sketchup 7/8 (wglGetPixelFormatAttribivARB doesn't allow WGL_SWAP_METHOD_ARB support)

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=16699

--- Comment #24 from Ken Thomases <ken at codeweavers.com> ---
Hi Anastasius,

I'm a bit confused by your analysis...

(In reply to Anastasius Focht from comment #23)

> It then queries for 'WGL_SWAP_METHOD_ARB' attribute and specifically checks
> for 'WGL_SWAP_EXCHANGE_ARB' value upon return.

Meaning it wants WGL_SWAP_EXCHANGE_ARB, right? You later say:

> Anyway, hacking 'winex11.drv' to allow 'wglGetPixelFormatAttribivARB' to
> return 'WGL_SWAP_EXCHANGE_ARB' for the selected pixel formats helped.

Which seems to indicate that.  However:

> Wine-dbg>n
> 2620	        switch (curWGLAttr) {
> Wine-dbg>n
> 2744	                piValues[i] = WGL_SWAP_EXCHANGE_ARB;
> 
> ...
> 
> Wine-dbg>n
> 2812	        if (0 != curGLXAttr && iPixelFormat != 0) {
> Wine-dbg>n
> 2818	            piValues[i] = GL_FALSE; 

This last statement is the "else" for the "if" shown just before it.  It should
only happen when 0 == curGLXAttr || iPixelFormat == 0.  But neither of those
should be the case, at least not in the same call that hit the earlier
piValues[i] = WGL_SWAP_EXCHANGE_ARB statement.

Are you sure the function did not report WGL_SWAP_EXCHANGE_ARB out as the swap
method?

> In the end it reports "swap copy unavailable" and keeps multisampling
> disabled for the pixel format.

This suggests the program doesn't want WGL_SWAP_EXCHANGE_ARB, it wants
WGL_SWAP_COPY_ARB.  It looks to me like winex11.drv claims to support the
former but not the latter.

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