mmozeiko

3 maanden geledendiscuss

sub is also recognized as zeroing idiom for register file. Intel documents these in "3.5.1.7 Clearing Registers and Dependency Breaking Idioms" from Optimization Reference Manual: https://www.intel.com/content/www/us/en/developer/articles/t...

Here's html version: https://zzqcn.github.io/perf/intel_opt_manual/3.html#clearin...

AMD has similar list in "2.9.2 Idioms for Dependency removal" from "Software Optimization Guide for the AMD Zen5 Microarchitecture" document: https://docs.amd.com/v/u/en-US/58455_1.00

mmozeiko

3 maanden geledendiscuss

xor swap trick was useful in older simd (sse1/sse2) when based on some condition you want to swap values or not:

  tmp = (a ^ b) & mask
  a ^= tmp
  b ^= tmp

If mask = 0xfff...fff then a/b will be swapped, otherwise if mask = 0 then they'll remain the same.

mmozeiko

4 maanden geledendiscuss

How does it compare to rendering SVG by Direct2D itself? When using ID2D1DeviceContext5::DrawSvgDocument method, and ID2D1SvgDocument can be loaded from file with ID2D1DeviceContext5::CreateSvgDocument + SHCreateStreamOnFileW.

mmozeiko

10 maanden geledendiscuss

Ah, I see. Yeah, then the current approach is fine.

mmozeiko

10 maanden geledendiscuss

From what I understand from code those unwarps are just doing matrix multiply to get unwraped pixel location? In this case doing these operations directly in fragment shader instead of texture lookup will be faster. Memory bandwidth is not free. But simple ALU like this (just couple FMA's) can easily hide in shadow of texture sampling that happens afterwards. So simply upload those undistortion matrices (mat1 & mat2) as uniforms and do matrix multiply in shader for adjusting texcoords.

mmozeiko

12 maanden geledendiscuss

There's also Windows.Graphics.Capture. It allows to get texture not only for whole desktop, but just individual windows.

mmozeiko

vorig jaardiscuss

I don't know why Signal calls it "DRM" because the do not use DRM for this. Typically DRM means encryption & keys are involved (which is what Netflix & others are doing with Widevine or PlayReady).

All Signal does is just a simple Windows API call to exclude window from screen capture. SetWindowDisplayAffinity function with WDA_EXCLUDEFROMCAPTURE argument: https://learn.microsoft.com/en-us/windows/win32/api/winuser/...

mmozeiko

vorig jaardiscuss

If you change logic and/or to bitwise and/or then it'll be branchless.

mmozeiko

vorig jaardiscuss

https://github.com/veluca93/fpnge is a very fast png encoder. A bit lower compression ratio, but runs significantly faster than alternatives. Here is a presentation with benchmarks:

https://www.lucaversari.it/FJXL_and_FPNGE.pdf

mmozeiko

2 jaar geledendiscuss

There is a simple way to get that immediate from expression you want to calculate. For example, if you want to calculate following expression:

    (NOT A) OR ((NOT B) XOR (C AND A))

then you simply write

    ~_MM_TERNLOG_A | (~_MM_TERNLOG_B ^ (_MM_TERNLOG_C & _MM_TERNLOG_A))

Literally the expression you want to calculate. It evaluates to immediate from _MM_TERNLOG_A/B/C constants defined in intrinsic headers, at least for gcc & clang:

    typedef enum {
      _MM_TERNLOG_A = 0xF0,
      _MM_TERNLOG_B = 0xCC,
      _MM_TERNLOG_C = 0xAA
    } _MM_TERNLOG_ENUM;

For MSVC you define them yourself.

mmozeiko

2 jaar geledendiscuss

Unfortunately not everything. For example, no xbox 360 controller support: https://github.com/microsoft/GDK/issues/39

mmozeiko

3 jaar geledendiscuss

It is called far2l: https://packages.debian.org/search?keywords=far2l&searchon=n...

mmozeiko

3 jaar geledendiscuss

Alt + start typing jumps to file/folder with this name.

Ctrl + enter puts currently selected file/folder name into command-line.

Ctrl + O hides panels and shows you "background" with all the previous command outputs.

Custom editor can be set in F9 -> Options -> Editor settings.

mmozeiko

3 jaar geledendiscuss

I recommend Polygon as virtual filesystem for SQLite database files: https://plugring.farmanager.com/plugin.php?l=en&pid=973

PortaDev for accessing MTP mounts (like Android): https://plugring.farmanager.com/plugin.php?l=en&pid=933

DiskMenu for adding custom locations in Alt+F1/F2 menus: https://sourceforge.net/projects/farplugs/files/DiskMenu/

And if you're running Far under ConEmu, copy ConEmu\Plugins\ConEmu folder into Far's Plugins folder. It will do better integration with ConEmu (there will be bunch of new ConEmu related features under F11 menu in Far).

mmozeiko

3 jaar geledendiscuss

On Ubuntu this seems to be official (?) ppa: https://launchpad.net/~far2l-team/+archive/ubuntu/ppa Make sure "far2l-gui" is installed.

On ArchLinux there's package in AUR: https://aur.archlinux.org/packages/far2l-git (I maintain it).

Don't know details for other distros.

mmozeiko

3 jaar geledendiscuss

Make sure you run wxgtk build, not the terminal one. Terminal is limited on what shortcuts it can do. But wxgtk build runs exactly as windows counterpart - Alt+F1/F2 and many other shortcuts work fine.

mmozeiko

3 jaar geledendiscuss

Here's a fancy trick from LLVM source: https://github.com/llvm/llvm-project/blob/main/llvm/lib/Targ...

  #define A 0xf0
  #define B 0xcc
  #define C 0xaa

And then you can build immediate for VPTERNLOG operation by writing bitwise expression with A/B/C values in source code.

For example, A^B^C=150. A^(~B&C)=210. And so on...

Also mentioned by Fabian here: https://twitter.com/rygorous/status/1187032693944410114

mmozeiko

3 jaar geledendiscuss

There's also dxwrapper that implements old DirectDraw/3D interfaces with newer D3D9 api for better compatibility with newer Windows versions:

https://github.com/elishacloud/dxwrapper

mmozeiko

3 jaar geledendiscuss

I'm pretty sure such thing is implemented by hooking OS functions that are dealing with directory enumeration, create/open file, etc - and then redirecting to custom code that provides virtual files & their contents. There's no standard Windows API for that, aside writing custom driver. But hooking such functions is relatively straight forward process because they are imported from well known shared libraries - you just need to make sure you hook all the functions that are relevant to filesystem operations.

mmozeiko

4 jaar geledendiscuss

Not fully open-sourced. There are bunch of pieces that are available only in compiled form - .obj/lib files. Like math.h functions.

Submissions

An Innocuous Blog Post about vPMU in QEMU

FJXL and FPNGE – Fast SIMD lossless image encoders [pdf]

Docs\gpu\debugging_gpu_related_code.md detected as malware by Windows Defender

GPU-Friendly Font Rendering Directly from Glyph Outlines

Fly revolver

P2P web powered by torrents and blockchain

Video Conference Part 1: These Things Suck

ASUS driver enables RW access to physical memory

Thoughts on the Witness

Visual Transistor-Level Simulation of ARM1 with WebGL

ImGui: Bloat-Free Immediate Mode GUI for C++ with Minimal Dependencies

ImGui: Bloat-free Immediate Mode GUI for C++ with minimal dependencies

VP9 encoding/decoding performance vs. HEVC/H.264

Intervals in modular arithmetic

8088 PC Speaker MOD player: How it’s done

How I hacked WarFace (a Crytek FPS)

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