IDA-RE-things

@66cats I have used GTX 670 to test on my side. Have installed latest Thorium_SSE2_122.0.6261.171_WINXP_x32.zip Also installed "enhanced-h264ify" extention. to enable/disable several formats. Runned browser without any switches. And with my progwrp.dll replacement build 5061 installed. With AV1 only enabled with this extention, browser dont allow video from youtube at all. :) So you should specify how to reproduce it. Take me a link to the broblematic video. UPD: ok, have found AV1-enabled video, which is played. No problems. No 100% CPU spikes... Used only software decoding/rendering. UPD2: also have checked this video in HW Accelerated Rendering enabled (D3D9) the codecs used (from "stats for nerds"): av01 (397) / opus (251) Also have no any problems and no CPU load.

No, D3DCompiler not used, when --use-angle=d3d9 not used. (Except out have anabled it contantly in chrome://flags)

@66котов, can you give me a youtube link where the problem occurs ? as example. And another question -- does it happens also with Supermium with my DLL on your machine with XP ?

We have no any Video decode acceleration handling in progwrp.dll. It just provides D3DCompiler for shaders, allowing D3D Rendering accelaration to work on XP. The DXVA was removed from browser code. (MPC-HC uses DXVA). And will be restored later (I hope). And not by me. :). But by main browser developer. Chrome was had implemented only DXVA 2.0, avilable for Vista+. XP Has only DXVA 1.0 And MPC-HC uses it. Its not so simple to attach it. But possible of course. Requeres time, more work/rework/refactoring, knowledge and experience in that area.

if you are using a browser with D3D9 mode enabled (--use-angle=D3D9), then it can't be reproduced with original progwrp.dll, Because the latest available official progwrp dont have soupport for this. So you are using browser in 2 different rendering modes. And it will be appeared (may be) also when official progwrp.dll will support this. (If it will not be fixed in other parts of browser code -- video decoding and so on). I think it not depends on progwrp and my alternative for it. Because I just provide the possibility to use it on XP. For other code of browser. Try to reporduce it without D3D9 HW acceleration enabled. (without that switches)

So as I understand you are using D3D9 HW acceleration-mode in that case or no ?

Hello, I have browsing the topic and have read above. Its strange that it eats 100% of some CPU cores. Is it appears also with original progwrp ? If no, I will fix it. Also I should know which process of the browser do it (renderer, or others). And other info how to reproduce. This behaviour not appears on any of my machines with 1-4 cores . And no one user have reported it. Is it also reproduced with latest Supermium or only with Thorium ? Are you using the latest version of adapter - build 5061 ? Be best way of course is to write a bugreport on github.

I should add, that you should not expect from this "D3D9 HW Rendering Acceleartion" feature, enabled for XP, -- of some impossible in current state of other browser code. It will do some speedup on intermediate level computers. Especially while Youtube videos watching. Not intended for WebGL tests. may be _anything_ with it. Its just restored possibility to do that acceleration in some cases on XP. When Chromuim removed it in the past. On power computers, its may be no differences in rendering/speed. And I'm personally not use it on power computer, because of some disadvantages of that mode.

@UCyborg, Running on x64 systems not supported officially while. So its disabled in that way. But for testing you can allow this by adding hidden registry key: [HKEY_LOCAL_MACHINE\SOFTWARE\Chrome-xpapi-adapter] "dxgi"=dword:00000001 Your config should work.

Hello, this feature will work not with each Gfx card, as I noted in release notes. I'm not the whole browser developer to fix other bugs in whole browser code. The feature implemented just by providing D3DCompiler dll for shaders, compatible with XP. (Analog of D3DCompiler_47.dll for Vista+) But all this works on my graphics cards. Which system you are using ? I can't test it with all possible system configs. Does it work with any of previous versions/builds ? When I test it, the browser sometime not load at all, and then I do investigation and fixing of problem. If you provide more info in "issues" section, I will fix it.