[R300] jump_and_click snapshot

[Vladimir D. <vo...@mi...>]

       I just tagged "jump_and_click" snapshot of r300_driver.
       Both drm driver and r300 subdirectories were modified, the first one
       in a rather small way.

       The big change is that q3demo should now play in game mode, albeit
       with some texture related artifacts which are due to missing pixel
       shader generator. Thanks to Rune Petersen for nailing down the cause
       of lockups in NeHe lesson 20 !

       Other highlights:

              * Aapo Tahkola have started integrating proper support for
                vertex shaders. You will likely need to upgrade to latest
                Mesa tree to play with this.

              * Wladimir van der Laan have done wonderful work figuring out
                the meaning of texture format fields and how to use
                stencils. Turns out the texture transparency that "worked"
                in blended_fountain shapshot did so by accident.

              * Ben Skeggs nailed down remaining 3d primitive. Also looks
                like the warning about "not enough vertices" is normal for
                some programs.

       TODO/Help needed:

              * pixel shader generator is needed to take into account
                environment mode. Without it texture transparency will
                likely not work. A quick hack would be to convert the one
                we have to handle Alpha component properly.

              * stencil code is there, but we don't know how to enable
                stencil (i.e. an analog of STENCIL_ENABLE bit of R200).

                ClearBuffer also needs to be modified to process stencil
                as well.

              * rewrite r300_render.c to use proper mesa code (templates?)
                and support vertex buffers.

              * tuxracer-demo still locks up on entering game mode.

       Remember that anonymous CVS on SourceForge lags behind the main one.

                       enjoy !

                            Vladimir Dergachev