rygorous

why doesn't radfft support AVX on PC?

So there's two separate issues here: using instructions added in AVX and using 256-bit wide vectors. The former turns out to be much easier than the latter for our use case.

Problem number 1 was that you positively need to put AVX code in a separate file with different compiler settings (/arch:AVX for VC++, -mavx for GCC/Clang) that make all SSE code emitted also use VEX encoding, and at the time radfft was written there was no way in CDep to set compiler flags for just one file, just for the overall build.

[There's the GCC "target" annotations on individual funcs, which in principle fix this, but I ran into nasty problems with this for several compiler versions, and VC++ has no equivalent, so we're not currently using that and just sticking with different compilation units.]

The other issue is to do with CPU power management.

djg

Papers I like Pt. 1 Papers I like Pt. 2

Let's start meta:

1. Lamport - State the Problem Before Describing the Solution (1978). … 1-page memo. Read it.
2. Herlihy - Wait-free synchronization (1991) … Truly seminal. Lucid + enough good ideas for 4 papers easily.
3. Cook - How complex systems fail (1998) … 4 pages that anyone working on/with complex systems should read.

pixelmager

Use cases

• Bluenoise in the game INSIDE (dithering, raymarching, reflections)
• Dithering, Ray marching, shadows etc
• A Survery of Blue Noise and Its Applications

Textures/Matrices for direct use (data!)

• Moments In Graphics (void-and-cluster)
  • 2D
  • 3D and 4D
• Bart Wronski Implementation of Solid Angle algorithm

abstractalgo

Gamma, gamut, tone mapping, color, sRGB

sRGB learning curve
https://gamedevdaily.io/the-srgb-learning-curve-773b7f68cf7a#.y9sitvhmm

Color Math
http://www.essentialmath.com/GDC2015/VanVerth_Jim_DoingMathwRGB.pdf

The Importance of Terminology and sRGB Uncertainty
http://colour-science.org/posts/the-importance-of-terminology-and-srgb-uncertainty/

ocornut

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

paniq

max(-x,-y) = -min(x,y)
min(-x,-y) = -max(x,y)

abs(x) = abs(-x)
abs(x) = max(x,-x) = -min(x,-x)
abs(x*a) = if (a >= 0) abs(x)*a
              (a <  0) -abs(x)*a

// basically any commutative operation
min(x,y) + max(x,y) = x + y

KdotJPG

/**
 * K.jpg's OpenSimplex 2, smooth variant ("SuperSimplex")
 *
 * More language ports, as well as legacy 2014 OpenSimplex, can be found here:
 * https://github.com/KdotJPG/OpenSimplex2
 */

public class OpenSimplex2S {

    private static final long PRIME_X = 0x5205402B9270C86FL;

rygorous

// Declare coord_x/coord_y as non-normalized GL_SHORT x4
// coord_x: write 64-bit uint (x ^ 0x8000800080008000) in little endian order
// of 16-bit words, same for y (on a LE platform this happens automatically)
layout(location=0) in vec4 coord_x, coord_y;

// Center of screen: 64-bit uint for x/y, split up into 4 floats:
//   center_x_biased.x = ((center_x_u64 >>  0) & 0xffff) - 32768.0f;
//   center_x_biased.y = ((center_x_u64 >> 16) & 0xffff) - 32768.0f;
// and so forth.
uniform vec4 center_x_biased, center_y_biased;

P7h

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