Some random notes on trying (and failing) to get Proxmox as host with 5700G APU GPU PCI Passthrough to Ubuntu guest VM working:
References:
Descriptor sets have vexed me at every step of development. They're new and different and they have a lot of rules which aren't all that obvious. This document will hopefully lay out everything in one convenient place that I - and also you - can refer to
First, let's talk about what we're trying to do
Most renderers need some way for shaders to access resources like textures, buffers, etc. For the Vulkan API, this way is the almighty descriptor set. Descriptors, as I understand them, are essentially a pointer to a resource. You update your descriptor sets with your resources, then you bind the descriptor sets to your command buffer, then shaders involved in subsequent drawcalls can look at the descriptors to know what resources they should actually read from. I'm not entirely sure why there's this indirection - and in fact, on AMD GPUs descriptor sets are actually just pointers - but the indirection exists, and we all have to find a way to deal with it
https://github.com/MattPD/cpplinks / C++ Standard / C++20 / Coroutines
(draft; work in progress)
#coroutines (C++ Slack): https://cpplang.slack.com/archives/C5JS5JXT5
List of oldest supported version of top 10 Linux Distros and their glibc version according to distrowatch.com.
Out of all versions with published EOLs, 2.12 is the oldest glibc still active, found in CentOS 6.8.
If CentOS 6 and 7 are eliminated, the oldest glibc is 2.23 in Ubuntu and Slackware.
| #include "Quaternion.h" | |
| #include <cmath> | |
| // http://content.gpwiki.org/index.php/OpenGL:Tutorials:Using_Quaternions_to_represent_rotation | |
| // http://www.flipcode.com/documents/matrfaq.html | |
| // http://db-in.com/blog/2011/04/cameras-on-opengl-es-2-x/ | |
| // http://wiki.beyondunreal.com/Legacy:Quaternion | |
| // http://clb.demon.fi/MathGeoLib/docs/float3x3.cpp_code.html#612 | |
| // http://clb.demon.fi/MathGeoLib/docs/Quat_summary.php | |
| // http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToQuaternion/index.htm |
Orthodox C++ (sometimes referred as C+) is minimal subset of C++ that improves C, but avoids all unnecessary things from so called Modern C++. It's exactly opposite of what Modern C++ suppose to be.
Memory Optimization (Christer Ericson, GDC 2003)
http://realtimecollisiondetection.net/pubs/GDC03_Ericson_Memory_Optimization.ppt
Cache coherency primer (Fabian Giesen)
https://fgiesen.wordpress.com/2014/07/07/cache-coherency/
Code Clinic 2015: How to Write Code the Compiler Can Actually Optimize (Mike Acton)
http://gdcvault.com/play/1021866/Code-Clinic-2015-How-to
L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns
Compress 1K bytes with Zippy ............. 3,000 ns = 3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns = 20 µs
SSD random read ........................ 150,000 ns = 150 µs
Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs