On 12/16/2015 03:18 AM, Roland Scheidegger wrote:
Am 16.12.2015 um 00:05 schrieb Miklós Máté:
Hi,
This series aims to improve the looks of Star Wars: Knights of the
Old Republic (via Wine), but features some additional cleanup as
well. The main component of the series is the implementation of
GL_ATI_fragment_shader for all Gallium drivers (though I could only
test it with radeonsi, llvmpipe, and softpipe). If this extension is
available, the game uses it quite extensively: perhaps the most
notable effect is the animated water ripples, but it also fixes the
grass, improves the specular on wet characters (e.g. the Selkath) and
it is used for regular texturing almost everywhere. The game has two
optional post-process effects that also depend on this extension:
framebuffer effects (light bloom, distortion), and soft shadows.
Patches 5&6 are needed to fix crashing with post-processing. With
current fglrx the grass is wrong, and post-process crashes, but my
previous Radeon cards ran this game perfectly on Windows.
One other game that can use GL_ATI_fragment_shader is Doom 3, if
r_renderer="r200" instead of "best" (which means "arb2", if
GL_ARB_fragment_program is available). By default
image_useNormalCompression=0, which results in wrong lighting and
makes the specular overbright with r200. Setting it to 1 fixes r200,
but messes up arb2, setting it to 2 fixes both. The light interaction
is the same in r200 and arb2, but r200 doesn't have the heathaze
shader. Later idTech4 games don't support r200 anymore: in Quake 4
everything is green, in Prey the organic walls are black, and ETQW
has a completely revised renderer. I verified these with fglrx.
I think the reason why noone was interested in making ATI_fs supported
so far on anything other than r200 was that there just wasn't really
anything depending on it. As doom3 could use arb_fs just fine...
But I guess if wine can use it there's some more apps probably...
FWIW I think quake4 should work fine. Back when I implemented this for
r200, it was indeed broken and I traced that back to something broken in
the main shader (can't remember what, something trivial like wrong tex
unit used in an instruction). I reported that and got told it was
already fixed in the game - however there was never a new demo released
thus if you just have the demo it's still broken.
Roland
Well, it's KotOR using this extension, Wine is just relaying the OpenGL
calls. I was surprised to find out that this game uses OpenGL, because
it was initially released on Xbox. BTW Wine can use ATI fs on r200 to
emulate fix-function fragment processing, but it doesn't try to
implement DX8 shaders with it (advertises shader model 0).
It's good to hear that the full version of Quake 4 is fixed, I only have
the demo version. Now I know of 4 games that can use ATI fs: KotOR 1&2,
Doom 3, Quake 4. Note that the new Steam version of KotOR 2 is
completely rewritten, and doesn't use ATI fs anymore, but gog.com still
only has the original version. KotOR 1 was also modernized by the same
studio, but that is only available on mobile, and they don't plan to
port it to PC.
MM
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