[Bug 9609] graphical glitches running Tom Clancy's Splinter Cell Demo

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=9609





--- Comment #24 from Stefan Dösinger <stefandoesinger at gmx.at>  2009-04-26 15:52:38 ---
David_A on IRC wanted to look at the same function, perhaps get in sync with
him before you two do the same work independently.

Basically you have to set the format from the extension in the GL pixel format
template in utils.c, and set the GL_STENCIL_ATTACHMENT_EXT to the same
renderbuffer or texture in context_attach_depth_stencil_fbo in context.c

There are a few things that make it slightly(not much) more complicated:

*) We want to be able to fall back to the current stencil-free operation if the
extension is not supported. So have a fallback that uses the stencil-free gl
format in the InitPixelFormats function(or a similar name) in utils.c

*) There is no way to set a stencil attachment != the depth attachment on most
drivers(that just means no stencil fbos without that extension. With the
extension they have the same ID, so things are fine)

*) Avoid comparing the format against D24S8 in
context_attach_depth_stencil_fbo. Instead, create a new pixel format flag and
check for the flag in this function. Using this flag you can easily fall back
to the stencil-free behavior if the extension is not supported.


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