yum/3ner

A toon shader for Unity's BIRP.

git clone https://git.yummers.dev/yum/3ner

yumImpostors: begin optimization work50e4514

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1// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)
2
3#ifndef UNITY_IMAGE_BASED_LIGHTING_INCLUDED
4#define UNITY_IMAGE_BASED_LIGHTING_INCLUDED
5
6#include "pbr_utils.cginc"
7#include "UnityStandardUtils.cginc"
8
9// ----------------------------------------------------------------------------
10// GlossyEnvironment - Function to integrate the specular lighting with default sky or reflection probes
11// ----------------------------------------------------------------------------
12struct Unity_GlossyEnvironmentData
13{
14    // - Deferred case have one cubemap
15    // - Forward case can have two blended cubemap (unusual should be deprecated).
16
17    // Surface properties use for cubemap integration
18    half    roughness; // CAUTION: This is perceptualRoughness but because of compatibility this name can't be change :(
19    half3   reflUVW;
20};
21
22// ----------------------------------------------------------------------------
23
24Unity_GlossyEnvironmentData UnityGlossyEnvironmentSetup(half Smoothness, half3 worldViewDir, half3 Normal, half3 fresnel0)
25{
26    Unity_GlossyEnvironmentData g;
27
28    g.roughness /* perceptualRoughness */   = smoothnessToPerceptualRoughness(Smoothness);
29    g.reflUVW   = reflect(-worldViewDir, Normal);
30
31    return g;
32}
33
34// ----------------------------------------------------------------------------
35half perceptualRoughnessToMipmapLevel(half perceptualRoughness)
36{
37    return perceptualRoughness * UNITY_SPECCUBE_LOD_STEPS;
38}
39
40// ----------------------------------------------------------------------------
41half mipmapLevelToPerceptualRoughness(half mipmapLevel)
42{
43    return mipmapLevel / UNITY_SPECCUBE_LOD_STEPS;
44}
45
46// ----------------------------------------------------------------------------
47half3 Unity_GlossyEnvironment (UNITY_ARGS_TEXCUBE(tex), half4 hdr, Unity_GlossyEnvironmentData glossIn)
48{
49    half perceptualRoughness = glossIn.roughness /* perceptualRoughness */ ;
50
51// TODO: CAUTION: remap from Morten may work only with offline convolution, see impact with runtime convolution!
52// For now disabled
53#if 0
54    float m = PerceptualRoughnessToRoughness(perceptualRoughness); // m is the real roughness parameter
55    const float fEps = 1.192092896e-07F;        // smallest such that 1.0+FLT_EPSILON != 1.0  (+1e-4h is NOT good here. is visibly very wrong)
56    float n =  (2.0/max(fEps, m*m))-2.0;        // remap to spec power. See eq. 21 in --> https://dl.dropboxusercontent.com/u/55891920/papers/mm_brdf.pdf
57
58    n /= 4;                                     // remap from n_dot_h formulatino to n_dot_r. See section "Pre-convolved Cube Maps vs Path Tracers" --> https://s3.amazonaws.com/docs.knaldtech.com/knald/1.0.0/lys_power_drops.html
59
60    perceptualRoughness = pow( 2/(n+2), 0.25);      // remap back to square root of real roughness (0.25 include both the sqrt root of the conversion and sqrt for going from roughness to perceptualRoughness)
61#else
62    // MM: came up with a surprisingly close approximation to what the #if 0'ed out code above does.
63    perceptualRoughness = perceptualRoughness*(1.7 - 0.7*perceptualRoughness);
64#endif
65
66
67    half mip = perceptualRoughnessToMipmapLevel(perceptualRoughness);
68    half3 R = glossIn.reflUVW;
69    half4 rgbm = UNITY_SAMPLE_TEXCUBE_LOD(tex, R, mip);
70
71    return DecodeHDR(rgbm, hdr);
72}
73#endif // UNITY_IMAGE_BASED_LIGHTING_INCLUDED