On Sun, Feb 7, 2010 at 4:40 PM, Reece Dunn <mscl...@googlemail.com> wrote: > On 7 February 2010 15:02, Roderick Colenbrander <thunderbir...@gmail.com> > wrote: >>> Emmanuel's code is available from Sourceforge. It is a good starting >>> point for this. If you want, send me what you have so far for testing >>> purposes. It would be great to have a native MacOSX windowing system. >>> >>> James McKenzie >>> >> >> The design of the old quartz driver is not correct. I remember that >> Alexandre commented that a lot of code which was in it doesn't make >> sense for a quartz driver but only for X11. Before a quartz driver can >> be written we really need a dib engine. It will make writing another >> driver much easier and much more code would be shared. >> >> Thinking a few steps further I also think that at some point the >> current X11 driver needs to be redesigned for modern windows version >> (we would get a classic winex11 and a modern one). The modern one >> would in my opinion only be responsible for creating windows, font >> rendering but the rest would all be done using OpenGL. This way the >> rendering code could also work on OSX and only window management stuff >> would be needed. > > In general, this seems to be the best approach. I do have a few > questions, though: > > 1/ Does this mean that OpenGL is required for all GDI calls, not > just D3D? If so, it will exclude people who don't have OpenGL support > (e.g. are using the vesa, nv, or nouveau drivers).
I think that in the end we would need 2 drivers. One classic x11 in the current design (adjusted a bit were possible) and one which follows the Win7-design using OpenGL. The idea would be to let Wine perform the majority of GDI calls in software (both the DIB stuff and a big part of the DDB calls). Like Win7 we would accelerate common GDI functions like AlphaBlend, BitBlt/StretchBlt (only the common ROPs like SRCBLT and a few others) and ColorFill on the gpu using opengl. See http://msdn.microsoft.com/en-us/library/dd434692.aspx for what Win7 accelerates. When using OpenGL we would emulate DIBSections using PBOs and perhaps GLX_texture_from_bitmap is of any use as well in case of X11. > 2/ What will the performance of GDI32 calls be like? There are > various comments that the Vista architecture does not optimise GDI32 > calls, so applications that use these are slower. > Vista performed all of GDI in software but Win7 accelerates a couple of common calls which I mentioned above using the GPU. Performance could be quite good. So to summarize a win7-style wine rendering architecture would perform all DIB rendering in software ('the dib engine') and also the non-common DDB calls. Other calls are accelerated using OpenGL. A x11/quartz/some_other_os driver would be used for window creation, window management, input and likely font rendering. Roderick
