Comments on: Direct3D GPU Hacks http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/ Random thoughts of a triangle pusher Sat, 17 Jul 2010 12:39:05 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Aras Pranckevičius http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-30167 Aras Pranckevičius Mon, 12 Apr 2010 14:03:14 +0000 http://aras-p.info/blog/?p=462#comment-30167 @JSeb: it was not reported on Radeon HD 2600 and 3850 that I tried. Maybe I tried too old drivers; don't remember right now. @JSeb: it was not reported on Radeon HD 2600 and 3850 that I tried. Maybe I tried too old drivers; don’t remember right now.

]]> By: JSeb http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-30162 JSeb Mon, 12 Apr 2010 12:42:13 +0000 http://aras-p.info/blog/?p=462#comment-30162 From Amd's paper, "RESZ" is supported by "HD 2xxx+" (not only "HD 4xxx+") Plus, "The RESZ interface is a good alternative to use for cards that don’t support INTZ." ie you get a INTZ buffer update with an additionnal copy & storage. From Amd’s paper, “RESZ” is supported by “HD 2xxx+” (not only “HD 4xxx+”)
Plus, “The RESZ interface is a good alternative to use for cards that don’t support INTZ.”
ie you get a INTZ buffer update with an additionnal copy & storage.

]]> By: Dragon http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-27540 Dragon Thu, 18 Feb 2010 23:13:06 +0000 http://aras-p.info/blog/?p=462#comment-27540 Most recent games (GTA4, Dark Void) use new NVidia hack NVCS CreateTexture(Width = 24, Height = 1, Levels = 1, Usage = D3DUSAGE_RENDERTARGET, Format = 'NVCS', Pool = D3DPOOL_DEFAULT, *ppTexture = 00000000, pSharedHandle = 00000000) But I do not know why. Most recent games (GTA4, Dark Void) use new NVidia hack NVCS
CreateTexture(Width = 24, Height = 1, Levels = 1, Usage = D3DUSAGE_RENDERTARGET, Format = ‘NVCS’, Pool = D3DPOOL_DEFAULT, *ppTexture = 00000000, pSharedHandle = 00000000)

But I do not know why.

]]> By: Fulg http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-27067 Fulg Thu, 11 Feb 2010 20:35:40 +0000 http://aras-p.info/blog/?p=462#comment-27067 Thanks, this is useful! I've been developing on consoles for so long, I didn't keep track of what works and what doesn't... you get used pretty quickly to fixed hardware specs :) Cheers! Thanks, this is useful! I’ve been developing on consoles for so long, I didn’t keep track of what works and what doesn’t… you get used pretty quickly to fixed hardware specs :)

Cheers!

]]> By: rride http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-25773 rride Mon, 25 Jan 2010 10:46:17 +0000 http://aras-p.info/blog/?p=462#comment-25773 Oh, sorry, I haven't noticed that one in your list Oh, sorry, I haven’t noticed that one in your list

]]> By: rride http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-25772 rride Mon, 25 Jan 2010 10:45:08 +0000 http://aras-p.info/blog/?p=462#comment-25772 Hi, I've just found one more hack - RESZ, at least for the ATIs cards to resolve a multisample depth buffer into single-sample one see here http://developer.amd.com/gpu_assets/Advanced%20DX9%20Capabilities%20for%20ATI%20Radeon%20Cards.pdf Hi, I’ve just found one more hack – RESZ, at least for the ATIs cards to resolve a multisample depth buffer into single-sample one

see here http://developer.amd.com/gpu_assets/Advanced%20DX9%20Capabilities%20for%20ATI%20Radeon%20Cards.pdf

]]> By: Aras Pranckevičius http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-23189 Aras Pranckevičius Thu, 26 Nov 2009 04:56:54 +0000 http://aras-p.info/blog/?p=462#comment-23189 Yeah, the awesome joys of developing on a PC... not! Yeah, the awesome joys of developing on a PC… not!

]]> By: keith http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-23121 keith Tue, 24 Nov 2009 19:32:20 +0000 http://aras-p.info/blog/?p=462#comment-23121 It seems that that R2VB isn't supported on nVidia DX10 hardware (8800+), but vertex texture fetching is the preferred path on that hardware anyway. And there are texture format restrictions for using USAGE_DMAP formats on previous generation nVidia cards (only some 16 and 32bit formats are supported). But then the ATI X1xxx cards don't support VTF. You just can't win! It seems that that R2VB isn’t supported on nVidia DX10 hardware (8800+), but vertex texture fetching is the preferred path on that hardware anyway. And there are texture format restrictions for using USAGE_DMAP formats on previous generation nVidia cards (only some 16 and 32bit formats are supported). But then the ATI X1xxx cards don’t support VTF. You just can’t win!

]]> By: Aras Pranckevičius http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-23095 Aras Pranckevičius Tue, 24 Nov 2009 04:48:56 +0000 http://aras-p.info/blog/?p=462#comment-23095 @keith: I just ran custom FOURCC detection code, and it looks like on GeForce 6 & 7 series the driver says "yes!" to R2VB hack. No idea if it works in practice though. @keith: I just ran custom FOURCC detection code, and it looks like on GeForce 6 & 7 series the driver says “yes!” to R2VB hack. No idea if it works in practice though.

]]> By: keith http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-23079 keith Mon, 23 Nov 2009 21:58:08 +0000 http://aras-p.info/blog/?p=462#comment-23079 Thanks, very handy to have. Can you give any more details on 'Render to Vertex Buffer' on nVidia cards? Where did you hear some GPUs/drivers support it? Thanks, very handy to have. Can you give any more details on ‘Render to Vertex Buffer’ on nVidia cards? Where did you hear some GPUs/drivers support it?

]]> By: Aras Pranckevičius http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-22994 Aras Pranckevičius Sat, 21 Nov 2009 09:06:55 +0000 http://aras-p.info/blog/?p=462#comment-22994 @modeless: thanks! article updated. @modeless: thanks! article updated.

]]> By: modeless http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-22988 modeless Sat, 21 Nov 2009 08:17:35 +0000 http://aras-p.info/blog/?p=462#comment-22988 The fourcc "INST" is used to enable geometry instancing on SM2.0 ATI cards. if(d3d->CheckDeviceFormat(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, D3DFMT_X8R8G8B8, 0, D3DRTYPE_SURFACE, (D3DFORMAT) MAKEFOURCC('I','N','S','T')) == D3D_OK)) device->SetRenderState(D3DRS_POINTSIZE, MAKEFOURCC('I','N','S','T')); The fourcc “INST” is used to enable geometry instancing on SM2.0 ATI cards.

if(d3d->CheckDeviceFormat(D3DADAPTER_DEFAULT,
D3DDEVTYPE_HAL, D3DFMT_X8R8G8B8, 0, D3DRTYPE_SURFACE,
(D3DFORMAT) MAKEFOURCC(‘I’,'N’,'S’,'T’)) == D3D_OK))
device->SetRenderState(D3DRS_POINTSIZE, MAKEFOURCC(‘I’,'N’,'S’,'T’));

]]> By: Aras Pranckevičius http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-22953 Aras Pranckevičius Fri, 20 Nov 2009 19:14:54 +0000 http://aras-p.info/blog/?p=462#comment-22953 @steve, @martins, @VGP: thanks for the suggestions. Updated article with CSAA & Fetch4. @steve, @martins, @VGP: thanks for the suggestions. Updated article with CSAA & Fetch4.

]]> By: VGP http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-22941 VGP Fri, 20 Nov 2009 15:05:28 +0000 http://aras-p.info/blog/?p=462#comment-22941 Don't forget ATI's Fetch4 functionality : #define FOURCC_GET4 MAKEFOURCC('G','E','T','4') #define FOURCC_GET1 MAKEFOURCC('G','E','T','1') setSamplerState(stage, D3DSAMP_MIPMAPLODBIAS, FOURCC_GET4); setSamplerState(stage, D3DSAMP_MIPMAPLODBIAS, FOURCC_GET1); http://developer.amd.com/gpu_assets/Advanced%20DX9%20Capabilities%20for%20ATI%20Radeon%20Cards_v2.pdf Don’t forget ATI’s Fetch4 functionality :

#define FOURCC_GET4 MAKEFOURCC(‘G’,'E’,'T’,’4′)
#define FOURCC_GET1 MAKEFOURCC(‘G’,'E’,'T’,’1′)

setSamplerState(stage, D3DSAMP_MIPMAPLODBIAS, FOURCC_GET4);
setSamplerState(stage, D3DSAMP_MIPMAPLODBIAS, FOURCC_GET1);

http://developer.amd.com/gpu_assets/Advanced%20DX9%20Capabilities%20for%20ATI%20Radeon%20Cards_v2.pdf

]]> By: martins http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-22940 martins Fri, 20 Nov 2009 14:49:40 +0000 http://aras-p.info/blog/?p=462#comment-22940 It is mentioned here: http://developer.nvidia.com/object/coverage-sampled-aa.html It is mentioned here: http://developer.nvidia.com/object/coverage-sampled-aa.html

]]> By: Aras Pranckevičius http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-22939 Aras Pranckevičius Fri, 20 Nov 2009 13:09:50 +0000 http://aras-p.info/blog/?p=462#comment-22939 @steve: I think I've got various forms of transparency anti-aliasing under... "Transparency anti-aliasing" :) How do you turn on CSAA on NVIDIA? @steve: I think I’ve got various forms of transparency anti-aliasing under… “Transparency anti-aliasing” :) How do you turn on CSAA on NVIDIA?

]]> By: steve http://aras-p.info/blog/2009/11/20/direct3d-gpu-hacks/comment-page-1/#comment-22938 steve Fri, 20 Nov 2009 12:42:57 +0000 http://aras-p.info/blog/?p=462#comment-22938 Nice, I haven't seen this gathered together in one place before. I had no idea ATI had implemented the old Dx9 shadowmap lookup hack in the HD2xxx+. Hacks not in this list that I can think of that we've used: - Alpha to coverage: (D3DRS_ADAPTIVETESS_Y hack on nv, D3DRS_POINTSIZE on ATI, not sure about any others - Coverage Sampled AA (nvidia only?) Nice, I haven’t seen this gathered together in one place before. I had no idea ATI had implemented the old Dx9 shadowmap lookup hack in the HD2xxx+.

Hacks not in this list that I can think of that we’ve used:
- Alpha to coverage: (D3DRS_ADAPTIVETESS_Y hack on nv, D3DRS_POINTSIZE on ATI, not sure about any others
- Coverage Sampled AA (nvidia only?)

]]>