Doom3 shadow optimization

[revelator]

Just for fun i tried an old build of raynors engine with glsl interactions and the bug is gone when in glsl mode so its definatly some fuckup with ARB2 shaders on AMD.

[revelator]

[revelator]

Huh has anyone tried out the old R200 renderer with Doom3 recently ? asking because i just did and it runs amazlingly well with my R9 270x

[nbohr1more]

Interesting result. Though I suspect it's simply the lack of shaders there?

You'd think the lack of r_useShadowVertexProgram in that path would make it slower.

[revelator]

One should have thought aye. AMD even supports some Nvidia specific render calls, found that one out when i noticed Barnes VBO mem code used the Nvidia api for getting videoram

[revelator]

[revelator]

glsl renderer, looks mighty purty even though its only used for interactions / shadows

[motorsep]

Might as well post a comparison screenshot from Doom 3 - I don't really see much difference from the top of my head :/

[revelator]

Ofc it does not look different in fact i gone to great lenghts to make it look like the ARB2 version.
Original version was even darker than vanilla and had some weird shading in places.

Keeping it off for now though as it does nasty things to certain gfx mods, atm it only works on unmodified Doom3.

[motorsep]

Lol, why go through all that trouble when it doesn't even work as expected to begin with and ARB2 backend looks better?

[Spike]

probably because there's only one graphics company that supports any asm extensions. maybe he wants to make a gles2 port?

[motorsep]

AMD dropped it?

[Spike]

by asm extensions, I mean extensions to the asm stuff, rather than the asm itself. point is that while asm works, you can't use any of the extra stuff that has since been added to glsl (like geometry shaders etc) as asm on either amd or intel gpus (afaik, I don't have either).

[motorsep]

Doom 3 BFG already does everything and more than what people have tried doing with old Doom 3. Seems like counter productive, unless it's for personal learning experience.

[revelator]

Bingo