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// maximum relative error : 2.38418579e-07
const float exp2_c0 = 0.999999930f;
const float exp2_c1 = 0.693153100f;
const float exp2_c2 = 0.240153617f;
const float exp2_c3 = 0.055826318f;
const float exp2_c4 = 0.008989340f;
const float exp2_c5 = 0.0018775767f;

inline float exp2_zero_one_range(float x)
{

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Atmosphere / Clouds Rendering

Research papers

Atmosphere

• A fast, simple method to render sky color using gradients maps [[Abad06]]
• A Framework for the Experimental Comparison of Solar and Skydome Illumination [[Kider14]]
• A Method for Modeling Clouds based on Atmospheric Fluid Dynamics [[Miyazaki01]]
• A Physically-Based Night Sky Model [[Jensen01]]

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Perceptual Image Differencing

• [1983. Peter Burt and Edward Adelson. The Laplacian Pyramid as a Compact Image Code][1]
• [1993. Scott Daly. The visible differences predictor: an algorithm for the assessment of image fidelity][2]
• [1995. Andrew S. Glassner. In Principles of digital image synthesis, pages 59-66][3]
• [1997. Gregory Ward-Larson, Holly Rushmeier, and Christine Piatko. A visibility matching tone reproduction operator for high dynamic range scenes][4]
• [1999. Mahesh Ramasubramanian, Sumant N. Pattnaik, Donald P. Greenberg. A perceptually based physical error metric for realistic image synthesis][5]
• [2004. Yangli Hector Yee, Anna Newman. A perceptual metric for production Testing][6]
• [2004. HECTOR YEE, SUMANTA PATTANAIK and DONALD P. GREENBERG. Spatiotemporal Sensitivity and Visual Attention for Efficient Rendering of Dynamic Environments][7]
• [2004. Hector Yee. *A Perceptual Metric for Production Testing (Submitted and Accepted in Journal of

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uint ReadSlotId(uint LaneId, uint mask0, uint mask1)
{
    return LaneId & (0x20 | mask0) | mask1;
}

void LdsBarrier() {}

groupshared float Scratch[64];

float PrefixSum64(uint LaneId, float x)

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float Min3(float a, float b, float c)
{
    return min(a, min(b, c));
}

float Max3(float a, float b, float c)
{
    return max(a, max(b, c));
}

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local msvc_config =
{
  Env = {
    CCOPTS = {
      "/Wall", "/WL", "/GR-", "/EHs-c-", "/analyze", '/FA', '/TC',
      "/Zl", "/Za",
      { "/O2", "/GL", "/GS-", "/Gw"; Config = "*-vs*-release" },
      { "/Od", "/GL-", "/GS", "/RTCcsu"; Config = "*-vs*-debug" },
    },
    LIBS = {

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uint BitReverse(uint x)
{
    x = ((x & 0x55555555) <<  1) | ((x & 0xaaaaaaaa) >>  1);
    x = ((x & 0x33333333) <<  2) | ((x & 0xcccccccc) >>  2);
    x = ((x & 0x0f0f0f0f) <<  4) | ((x & 0xf0f0f0f0) >>  4);
    x = ((x & 0x00ff00ff) <<  8) | ((x & 0xff00ff00) >>  8);
    x = ((x & 0x0000ffff) << 16) | ((x & 0xffff0000) >> 16);
    return x;
}

reinsteam

etcpack test.png test -s slow -e perceptual -as -c etc -f RGB -ext PNG -ktx -v -progress

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using UnityEngine;

public class PreviewTexture2D : PropertyAttribute
{
    public PreviewTexture2D()
    { }
}

reinsteam

#pragma warning (push)
    /* 4820: '<struct-name>' : 'n' bytes padding added after data member '<member-name>'*/
#   pragma warning (disable : 4820)
#   pragma warning (disable : 4255 4668)
#   include <windows.h>
#   include <stdio.h>
#pragma warning (pop)

typedef unsigned u32;