move unity package to the root

Documentation~/README.md

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+# Mixbox for Unity
+
+Open `Window` > `Package Manager` and choose ` + ` > `Add packge from git URL...`:
+```
+https://github.com/scrtwpns/mixbox.git#upm
+```
+
+## Script
+```csharp
+using UnityEngine;
+using Scrtwpns.Mixbox;
+
+public class NewBehaviourScript : MonoBehaviour
+{
+    void Start()
+    {
+        Color color1 = new Color(0.0f, 0.129f, 0.522f); // blue
+        Color color2 = new Color(0.988f, 0.827f, 0.0f); // yellow
+        float t = 0.5f;                                 // mixing ratio
+
+        Color colorMix = Mixbox.Lerp(color1, color2, t);
+
+        Debug.Log(colorMix);
+    }
+}
+```
+```csharp
+Color MixThree(Color color1, Color color2, Color color3)
+{
+    MixboxLatent z1 = Mixbox.RGBToLatent(color1);
+    MixboxLatent z2 = Mixbox.RGBToLatent(color2);
+    MixboxLatent z3 = Mixbox.RGBToLatent(color3);
+
+    // mix 30% of color1, 60% of color2, and 10% of color3
+    MixboxLatent zMix = 0.3f*z1 + 0.6f*z2 + 0.1f*z3;
+
+    Color colorMix = Mixbox.LatentToRGB(zMix);
+
+    return colorMix;
+}
+```
+
+## Shader
+```ShaderLab
+Shader "MixboxHelloShader"
+{
+    Properties
+    {
+        [NoScaleOffset] _MixboxLUT ("Mixbox LUT", 2D) = "white" {} // assign "Packages/Mixbox/Textures/MixboxLUT.png"
+
+        _Color1 ("Color 1", Color) = (0, 0.129, 0.522, 1) // blue
+        _Color2 ("Color 2", Color) = (0.988, 0.827, 0, 1) // yellow
+    }
+    SubShader
+    {
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            sampler2D _MixboxLUT;
+            #include "Packages/com.scrtwpns.mixbox/ShaderLibrary/Mixbox.cginc"
+
+            fixed4 _Color1;
+            fixed4 _Color2;
+
+            struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; };
+            struct v2f { float2 uv : TEXCOORD0; float4 vertex : SV_POSITION; };
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.uv = v.uv;
+                return o;
+            }
+
+            fixed4 frag (v2f i) : SV_Target
+            {
+                return MixboxLerp(_Color1, _Color2, i.uv.x);
+            }
+            ENDCG
+        }
+    }
+}
+```
+```hlsl
+float3 MixThree(float3 rgb1, float3 rgb2, float3 rgb3)
+{
+    MixboxLatent z1 = MixboxRGBToLatent(rgb1);
+    MixboxLatent z2 = MixboxRGBToLatent(rgb2);
+    MixboxLatent z3 = MixboxRGBToLatent(rgb3);
+
+    // mix together 30% of rgb1, 60% of rgb2, and 10% of rgb3
+    MixboxLatent zMix = 0.3*z1 + 0.6*z2 + 0.1*z3;
+
+    float3 rgbMix = MixboxLatentToRGB(zMix);
+
+    return rgbMix;
+}
+```
+<p align="center">
+  <img src="https://scrtwpns.com/mixbox/unity/mixboxlut-howto.png"/>
+</p>
+
+## URP Shader
+```ShaderLab
+Shader "Mixbox/Mixbox URP Sample Shader"
+{
+    Properties
+    {
+        [NoScaleOffset] _MixboxLUT ("Mixbox LUT", 2D) = "white" {} // assign "Packages/Mixbox/Textures/MixboxLUT.png"
+
+        _Color1 ("Color 1", Color) = (0, 0.129, 0.522, 1) // blue
+        _Color2 ("Color 2", Color) = (0.988, 0.827, 0, 1) // yellow
+    }
+
+    SubShader
+    {
+        Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalRenderPipeline" }
+
+        Pass
+        {
+            HLSLPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+
+            TEXTURE2D(_MixboxLUT);
+            SAMPLER(sampler_MixboxLUT);
+
+            #include "Packages/com.scrtwpns.mixbox/ShaderLibrary/Mixbox.hlsl"
+
+            struct Attributes { float4 positionOS : POSITION; float2 uv : TEXCOORD0; };
+            struct Varyings { float4 positionHCS : SV_POSITION; float2 uv : TEXCOORD0; };
+
+            CBUFFER_START(UnityPerMaterial)
+                half4 _Color1;
+                half4 _Color2;
+            CBUFFER_END
+
+            Varyings vert(Attributes IN)
+            {
+                Varyings OUT;
+                OUT.positionHCS = TransformObjectToHClip(IN.positionOS.xyz);
+                OUT.uv = IN.uv;
+                return OUT;
+            }
+
+            half4 frag(Varyings IN) : SV_Target
+            {
+                return MixboxLerp(_Color1, _Color2, IN.uv.x);
+            }
+            ENDHLSL
+        }
+    }
+}
+```
+
+## Shader Graph
+<p align="center">
+  <img src="https://scrtwpns.com/mixbox/unity/shadergraph_.png"/>
+</p>

LICENSE.md

@@ -0,0 +1,337 @@
+Mixbox is licensed for non-commercial use under the CC BY-NC 4.0 license below.
+
+If you want to obtain commercial license, please contact: mixbox@scrtwpns.com
+
+===============================================================================
+
+Creative Commons Attribution-NonCommercial 4.0 International Public License
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+
+===============================================================================

LICENSE.md.meta

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+guid: 4cdbb20e49a3f5f48ac2bbf852d78e9c
+TextScriptImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

README.md

@@ -1,67 +1,189 @@
-# Mixbox: Practical Pigment Mixing for Digital Painting
+# Mixbox for Unity
 
-<p align="center">
+Open `Window` > `Package Manager` and choose ` + ` > `Add packge from git URL..`:
-  <img src="https://scrtwpns.com/mixbox/teaser.jpg"/>
+```
-</p>
+https://github.com/scrtwpns/mixbox.git#upm
+```
 
-Mixbox is a pigment mixing black-box. You pass RGB colors in and get the mixed RGB out.
+## Script
-Internally, Mixbox treats the colors as if they were made of actual real-world pigments.
+```csharp
-It uses the Kubelka & Munk theory to predict the color of the resulting mixture.
+using UnityEngine;
-This way, Mixbox achieves that blue and yellow mix to green, the same way real pigments do.
+using Scrtwpns.Mixbox;
 
-* Paper: https://scrtwpns.com/mixbox.pdf<br>
+public class NewBehaviourScript : MonoBehaviour
-* Video: https://youtu.be/ATzVPVNp1qA<br>
-* Talk: https://youtu.be/_qa5iWdfNKg<br>
-* Demo: https://scrtwpns.com/mixbox/painter<br>
-
-Mixbox is shipping in Rebelle 5 Pro as the [Rebelle Pigments](https://www.escapemotions.com/products/rebelle/about) feature.
-
-## Usage
-The simplest way to use Mixbox is with the *lerp* interface:
-```c++
-#include <stdio.h>
-#include "mixbox.h"
-
-int main()
 {
-  unsigned char r1=252, g1=211, b1=0;  // bright yellow
+    void Start()
-  unsigned char r2=0,   g2=0,   b2=96; // deep blue
+    {
-  float t = 0.5;
+        Color color1 = new Color(0.0f, 0.129f, 0.522f); // blue
-  unsigned char r,g,b;
+        Color color2 = new Color(0.988f, 0.827f, 0.0f); // yellow
+        float t = 0.5f;                                 // mixing ratio
 
-  mixbox_lerp_srgb8(r1,g1,b1,   // first color
+        Color colorMix = Mixbox.Lerp(color1, color2, t);
-                    r2,g2,b2,   // second color
-                    t,          // mixing ratio
-                    &r,&g,&b);  // result
 
-  printf("%d %d %d\n",r,g,b);
+        Debug.Log(colorMix);
+    }
 }
 ```
-Alternatively, one can use the *latent* interface. This allows mixing multiple RGB colors at once using arbitrary weights:
+```csharp
-
+Color MixThree(Color color1, Color color2, Color color3)
-```c++
-float latent1[MIXBOX_NUMLATENTS];
-float latent2[MIXBOX_NUMLATENTS];
-float latentMix[MIXBOX_NUMLATENTS];
-
-mixbox_srgb8_to_latent(r1,g1,b1,latent1);
-mixbox_srgb8_to_latent(r2,g2,b2,latent2);
-
-for(int i=0;i<MIXBOX_NUMLATENTS;i++)
 {
-  latentMix[i] = (1.0f-t)*latent1[i] + t*latent2[i]; 
+    MixboxLatent z1 = Mixbox.RGBToLatent(color1);
-}
+    MixboxLatent z2 = Mixbox.RGBToLatent(color2);
+    MixboxLatent z3 = Mixbox.RGBToLatent(color3);
 
-mixbox_latent_to_srgb8(latentMix,&r,&g,&b);  
+    // mix 30% of color1, 60% of color2, and 10% of color3
+    MixboxLatent zMix = 0.3f*z1 + 0.6f*z2 + 0.1f*z3;
+
+    Color colorMix = Mixbox.LatentToRGB(zMix);
+
+    return colorMix;
+}
+```
+
+## Shader
+```ShaderLab
+Shader "MixboxHelloShader"
+{
+    Properties
+    {
+        [NoScaleOffset] _MixboxLUT ("Mixbox LUT", 2D) = "white" {} // assign "Packages/Mixbox/Textures/MixboxLUT.png"
+
+        _Color1 ("Color 1", Color) = (0, 0.129, 0.522, 1) // blue
+        _Color2 ("Color 2", Color) = (0.988, 0.827, 0, 1) // yellow
+    }
+    SubShader
+    {
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            sampler2D _MixboxLUT;
+            #include "Packages/com.scrtwpns.mixbox/ShaderLibrary/Mixbox.cginc"
+
+            fixed4 _Color1;
+            fixed4 _Color2;
+
+            struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; };
+            struct v2f { float2 uv : TEXCOORD0; float4 vertex : SV_POSITION; };
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.uv = v.uv;
+                return o;
+            }
+
+            fixed4 frag (v2f i) : SV_Target
+            {
+                return MixboxLerp(_Color1, _Color2, i.uv.x);
+            }
+            ENDCG
+        }
+    }
+}
+```
+```hlsl
+float3 MixThree(float3 rgb1, float3 rgb2, float3 rgb3)
+{
+    MixboxLatent z1 = MixboxRGBToLatent(rgb1);
+    MixboxLatent z2 = MixboxRGBToLatent(rgb2);
+    MixboxLatent z3 = MixboxRGBToLatent(rgb3);
+
+    // mix together 30% of rgb1, 60% of rgb2, and 10% of rgb3
+    MixboxLatent zMix = 0.3*z1 + 0.6*z2 + 0.1*z3;
+
+    float3 rgbMix = MixboxLatentToRGB(zMix);
+
+    return rgbMix;
+}
 ```
-## Demo
 <p align="center">
-  <a href="https://scrtwpns.com/mixbox/painter"><img src="https://scrtwpns.com/mixbox/painter_git.jpg"/></a>
+  <img src="https://scrtwpns.com/mixbox/unity/mixboxlut-howto.png"/>
 </p>
-This is a toy painting app with soft round brush and a smudge tool. It runs two color mixing implementations in parallel: one based on Mixbox and the other that performs ordinary RGB mixing. The app allows switching between them on the fly, showing the differences between pigment-based mixing and the normal RGB mixing. To launch the demo in your browser, please <a href="https://scrtwpns.com/mixbox/painter">click here</a>.
+
+## URP Shader
+```ShaderLab
+Shader "Mixbox/Mixbox URP Sample Shader"
+{
+    Properties
+    {
+        [NoScaleOffset] _MixboxLUT ("Mixbox LUT", 2D) = "white" {} // assign "Packages/Mixbox/Textures/MixboxLUT.png"
+
+        _Color1 ("Color 1", Color) = (0, 0.129, 0.522, 1) // blue
+        _Color2 ("Color 2", Color) = (0.988, 0.827, 0, 1) // yellow
+    }
+
+    SubShader
+    {
+        Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalRenderPipeline" }
+
+        Pass
+        {
+            HLSLPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+
+            TEXTURE2D(_MixboxLUT);
+            SAMPLER(sampler_MixboxLUT);
+
+            #include "Packages/com.scrtwpns.mixbox/ShaderLibrary/Mixbox.hlsl"
+
+            struct Attributes { float4 positionOS : POSITION; float2 uv : TEXCOORD0; };
+            struct Varyings { float4 positionHCS : SV_POSITION; float2 uv : TEXCOORD0; };
+
+            CBUFFER_START(UnityPerMaterial)
+                half4 _Color1;
+                half4 _Color2;
+            CBUFFER_END
+
+            Varyings vert(Attributes IN)
+            {
+                Varyings OUT;
+                OUT.positionHCS = TransformObjectToHClip(IN.positionOS.xyz);
+                OUT.uv = IN.uv;
+                return OUT;
+            }
+
+            half4 frag(Varyings IN) : SV_Target
+            {
+                return MixboxLerp(_Color1, _Color2, IN.uv.x);
+            }
+            ENDHLSL
+        }
+    }
+}
+```
+
+## Shader Graph
+<p align="center">
+  <img src="https://scrtwpns.com/mixbox/unity/shadergraph_.png"/>
+</p>
+
+## Pigment Colors
+| Pigment |  | RGB | Float RGB | Linear RGB |
+| --- | --- |:----:|:----:|:----:|
+| Cadmium Yellow | <img src="https://scrtwpns.com/mixbox/pigments/cadmium_yellow.png"/> | 254, 236, 0  | 0.996, 0.925, 0.0 | 0.991, 0.839, 0.0 |
+| Hansa Yellow | <img src="https://scrtwpns.com/mixbox/pigments/hansa_yellow.png"/> | 252, 211, 0  | 0.988, 0.827, 0.0 | 0.973, 0.651, 0.0 |
+| Cadmium Orange | <img src="https://scrtwpns.com/mixbox/pigments/cadmium_orange.png"/> | 255, 105, 0  | 1.0, 0.412, 0.0 | 1.0, 0.141, 0.0 |
+| Cadmium Red | <img src="https://scrtwpns.com/mixbox/pigments/cadmium_red.png"/> | 255, 39, 2  | 1.0, 0.153, 0.008 | 1.0, 0.02, 0.001 |
+| Quinacridone Magenta | <img src="https://scrtwpns.com/mixbox/pigments/quinacridone_magenta.png"/> | 128, 2, 46  | 0.502, 0.008, 0.18 | 0.216, 0.001, 0.027 |
+| Cobalt Violet | <img src="https://scrtwpns.com/mixbox/pigments/cobalt_violet.png"/> | 78, 0, 66  | 0.306, 0.0, 0.259 | 0.076, 0.0, 0.054 |
+| Ultramarine Blue | <img src="https://scrtwpns.com/mixbox/pigments/ultramarine_blue.png"/> | 25, 0, 89  | 0.098, 0.0, 0.349 | 0.01, 0.0, 0.1 |
+| Cobalt Blue | <img src="https://scrtwpns.com/mixbox/pigments/cobalt_blue.png"/> | 0, 33, 133  | 0.0, 0.129, 0.522 | 0.0, 0.015, 0.235 |
+| Phthalo Blue | <img src="https://scrtwpns.com/mixbox/pigments/phthalo_blue.png"/> | 13, 27, 68  | 0.051, 0.106, 0.267 | 0.004, 0.011, 0.058 |
+| Phthalo Green | <img src="https://scrtwpns.com/mixbox/pigments/phthalo_green.png"/> | 0, 60, 50  | 0.0, 0.235, 0.196 | 0.0, 0.045, 0.032 |
+| Permanent Green | <img src="https://scrtwpns.com/mixbox/pigments/permanent_green.png"/> | 7, 109, 22  | 0.027, 0.427, 0.086 | 0.002, 0.153, 0.008 |
+| Sap Green | <img src="https://scrtwpns.com/mixbox/pigments/sap_green.png"/> | 107, 148, 4  | 0.42, 0.58, 0.016 | 0.147, 0.296, 0.001 |
+| Burnt Sienna | <img src="https://scrtwpns.com/mixbox/pigments/burnt_sienna.png"/> | 123, 72, 0  | 0.482, 0.282, 0.0 | 0.198, 0.065, 0.0 |
 
 ## License
 Copyright (c) 2022, Secret Weapons. All rights reserved.<br>
-This code is for non-commercial use only. It is provided for research and evaluation purposes.<br>
+Mixbox is provided under the CC BY-NC 4.0 license for non-commercial use only.<br>
-If you wish to obtain commercial license, please contact: mixbox@scrtwpns.com
+If you want to obtain commercial license, please contact: mixbox@scrtwpns.com
-

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+Shader "Mixbox/Mixbox Sample Shader"
+{
+    Properties
+    {
+        [NoScaleOffset] _MixboxLUT ("Mixbox LUT", 2D) = "white" {} // assign "Packages/Mixbox/Textures/MixboxLUT.png"
+        
+        _Color1 ("Color 1", Color) = (0, 0.129, 0.522, 1) // blue
+        _Color2 ("Color 2", Color) = (0.988, 0.827, 0, 1) // yellow
+    }
+    SubShader
+    {
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            sampler2D _MixboxLUT;
+            #include "Packages/com.scrtwpns.mixbox/ShaderLibrary/Mixbox.cginc"
+
+            fixed4 _Color1;
+            fixed4 _Color2;
+            
+            struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; };
+            struct v2f { float2 uv : TEXCOORD0; float4 vertex : SV_POSITION; };             
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.uv = v.uv;
+                return o;
+            }
+
+            fixed4 frag (v2f i) : SV_Target
+            {
+                fixed4 mixedColor = MixboxLerp(_Color1, _Color2, i.uv.x);
+                return mixedColor;
+            }
+            ENDCG
+        }
+    }
+}

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Samples~/SamplesURP/Shaders/MixboxSampleURPShader.shader

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+Shader "Mixbox/Mixbox URP Sample Shader"
+{
+    Properties
+    { 
+        [NoScaleOffset] _MixboxLUT ("Mixbox LUT", 2D) = "white" {} // assign "Packages/Mixbox/Textures/MixboxLUT.png"
+        
+        _Color1 ("Color 1", Color) = (0, 0.129, 0.522, 1) // blue
+        _Color2 ("Color 2", Color) = (0.988, 0.827, 0, 1) // yellow
+    }
+
+    SubShader
+    {
+        Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalRenderPipeline" }
+
+        Pass
+        {
+            HLSLPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+
+            TEXTURE2D(_MixboxLUT);
+            SAMPLER(sampler_MixboxLUT);
+
+            #include "Packages/com.scrtwpns.mixbox/ShaderLibrary/Mixbox.hlsl"
+
+            struct Attributes { float4 positionOS : POSITION; float2 uv : TEXCOORD0; };
+            struct Varyings { float4 positionHCS : SV_POSITION; float2 uv : TEXCOORD0; };
+
+            CBUFFER_START(UnityPerMaterial)
+                half4 _Color1;
+                half4 _Color2;
+            CBUFFER_END
+
+            Varyings vert(Attributes IN)
+            {
+                Varyings OUT;
+                OUT.positionHCS = TransformObjectToHClip(IN.positionOS.xyz);
+                OUT.uv = IN.uv;
+                return OUT;
+            }
+
+            half4 frag(Varyings IN) : SV_Target
+            {
+                return MixboxLerp(_Color1, _Color2, IN.uv.x);
+            }
+            ENDHLSL
+        }
+    }
+}

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ShaderGraph/CustomFunctions/MixboxFunctions.hlsl

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+#ifndef MIXBOX_FUNCTIONS_INCLUDED
+#define MIXBOX_FUNCTIONS_INCLUDED
+
+#ifndef UNITY_COLORSPACE_GAMMA
+    #define MIXBOX_COLORSPACE_LINEAR
+#endif
+
+#define MIXBOX_LUT(UV) SAMPLE_TEXTURE2D_LOD(MixboxLUT.tex, MixboxLUT.samplerstate, UV, 0)
+
+typedef float3x3 MixboxLatent;
+
+float3 MixboxEvalPolynomial(float3 c)
+{
+    float c0 = c[0];
+    float c1 = c[1];
+    float c2 = c[2];
+    float c3 = 1.0 - (c0 + c1 + c2);
+
+    float c00 = c0 * c0;
+    float c11 = c1 * c1;
+    float c22 = c2 * c2;
+    float c01 = c0 * c1;
+    float c02 = c0 * c2;
+    float c12 = c1 * c2;
+    float c33 = c3 * c3;
+
+    return (c0*c00) * float3(+0.07717053, +0.02826978, +0.24832992) +
+           (c1*c11) * float3(+0.95912302, +0.80256528, +0.03561839) +
+           (c2*c22) * float3(+0.74683774, +0.04868586, +0.00000000) +
+           (c3*c33) * float3(+0.99518138, +0.99978149, +0.99704802) +
+           (c00*c1) * float3(+0.04819146, +0.83363781, +0.32515377) +
+           (c01*c1) * float3(-0.68146950, +1.46107803, +1.06980936) +
+           (c00*c2) * float3(+0.27058419, -0.15324870, +1.98735057) +
+           (c02*c2) * float3(+0.80478189, +0.67093710, +0.18424500) +
+           (c00*c3) * float3(-0.35031003, +1.37855826, +3.68865000) +
+           (c0*c33) * float3(+1.05128046, +1.97815239, +2.82989073) +
+           (c11*c2) * float3(+3.21607125, +0.81270228, +1.03384539) +
+           (c1*c22) * float3(+2.78893374, +0.41565549, -0.04487295) +
+           (c11*c3) * float3(+3.02162577, +2.55374103, +0.32766114) +
+           (c1*c33) * float3(+2.95124691, +2.81201112, +1.17578442) +
+           (c22*c3) * float3(+2.82677043, +0.79933038, +1.81715262) +
+           (c2*c33) * float3(+2.99691099, +1.22593053, +1.80653661) +
+           (c01*c2) * float3(+1.87394106, +2.05027182, -0.29835996) +
+           (c01*c3) * float3(+2.56609566, +7.03428198, +0.62575374) +
+           (c02*c3) * float3(+4.08329484, -1.40408358, +2.14995522) +
+           (c12*c3) * float3(+6.00078678, +2.55552042, +1.90739502);
+}
+
+float3 MixboxSRGBToLinear(float3 rgb)
+{
+    return (rgb >= 0.04045) ? pow((abs(rgb) + 0.055) / 1.055, 2.4) : rgb/12.92;
+}
+
+float3 MixboxLinearToSRGB(float3 rgb)
+{
+    return (rgb >= 0.0031308) ? 1.055*pow(abs(rgb), 1.0/2.4) - 0.055 : 12.92*rgb;
+}
+
+MixboxLatent MixboxRGBToLatent(UnityTexture2D MixboxLUT,float3 rgb)
+{
+#ifdef MIXBOX_COLORSPACE_LINEAR
+    rgb = MixboxLinearToSRGB(saturate(rgb));
+#else
+    rgb = saturate(rgb);
+#endif
+
+    float x = rgb.r * 63.0;
+    float y = rgb.g * 63.0;
+    float z = rgb.b * 63.0;
+
+    float iz = floor(z);
+
+    float x0 = fmod(iz, 8.0) * 64.0;
+    float y0 = floor(iz / 8.0) * 64.0;
+
+    float x1 = fmod(iz + 1.0, 8.0) * 64.0;
+    float y1 = floor((iz + 1.0) / 8.0) * 64.0;
+
+    float2 uv0 = float2(x0 + x + 0.5, 512.0 - (y0 + y + 0.5)) / 512.0;
+    float2 uv1 = float2(x1 + x + 0.5, 512.0 - (y1 + y + 0.5)) / 512.0;
+
+    float3 c = lerp(MIXBOX_LUT(uv0).rgb, MIXBOX_LUT(uv1).rgb, z - iz);
+
+    return MixboxLatent(c, rgb - MixboxEvalPolynomial(c), 0.0, 0.0, 0.0);
+}
+
+float3 MixboxLatentToRGB(MixboxLatent latent)
+{
+    float3 rgb = saturate(MixboxEvalPolynomial(latent[0]) + latent[1]);
+
+#ifdef MIXBOX_COLORSPACE_LINEAR
+    return MixboxSRGBToLinear(rgb);
+#else
+    return rgb;
+#endif
+}
+
+void MixboxLerp_float(float4 A, float4 B, float T, UnityTexture2D MixboxLUT, out float4 Out)
+{
+    Out = float4(MixboxLatentToRGB((1.0-T)*MixboxRGBToLatent(MixboxLUT, A.rgb) + T*MixboxRGBToLatent(MixboxLUT, B.rgb)), lerp(A.a, B.a, T));
+}
+
+#endif

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+// ==========================================================
+//  MIXBOX 2.0 (c) 2022 Secret Weapons. All rights reserved.
+//  License: Creative Commons Attribution-NonCommercial 4.0
+//  Authors: Sarka Sochorova and Ondrej Jamriska
+// ==========================================================
+//
+//   BASIC USAGE
+//
+//      float3 rgb = MixboxLerp(rgb1, rgb2, t);
+//
+//   MULTI-COLOR MIXING
+//
+//      MixboxLatent z1 = MixboxRGBToLatent(rgb1);
+//      MixboxLatent z2 = MixboxRGBToLatent(rgb2);
+//      MixboxLatent z3 = MixboxRGBToLatent(rgb3);
+//
+//      // mix 30% of rgb1, 60% of rgb2, and 10% of rgb3
+//      MixboxLatent z_mix = 0.3*z1 + 0.6*z2 + 0.1*z3;
+//
+//      float3 rgb_mix = MixboxLatentToRGB(z_mix);
+//
+//   PIGMENT COLORS
+//
+//      Cadmium Yellow              0.996, 0.925, 0.000
+//      Hansa Yellow                0.988, 0.827, 0.000
+//      Cadmium Orange              1.000, 0.412, 0.000
+//      Cadmium Red                 1.000, 0.153, 0.008
+//      Quinacridone Magenta        0.502, 0.008, 0.180
+//      Cobalt Violet               0.306, 0.000, 0.259
+//      Ultramarine Blue            0.098, 0.000, 0.349
+//      Cobalt Blue                 0.000, 0.129, 0.522
+//      Phthalo Blue                0.051, 0.106, 0.267
+//      Phthalo Green               0.000, 0.235, 0.196
+//      Permanent Green             0.027, 0.427, 0.086
+//      Sap Green                   0.420, 0.580, 0.016
+//      Burnt Sienna                0.482, 0.282, 0.000
+//
+//   LICENSING
+//
+//      If you want to obtain commercial license, please
+//      contact us at: mixbox@scrtwpns.com
+//
+
+#include "Packages/com.scrtwpns.mixbox/ShaderLibrary/Mixbox.hlsl"

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+// ==========================================================
+//  MIXBOX 2.0 (c) 2022 Secret Weapons. All rights reserved.
+//  License: Creative Commons Attribution-NonCommercial 4.0
+//  Authors: Sarka Sochorova and Ondrej Jamriska
+// ==========================================================
+//
+//   BASIC USAGE
+//
+//      float3 rgb = MixboxLerp(rgb1, rgb2, t);
+//
+//   MULTI-COLOR MIXING
+//
+//      MixboxLatent z1 = MixboxRGBToLatent(rgb1);
+//      MixboxLatent z2 = MixboxRGBToLatent(rgb2);
+//      MixboxLatent z3 = MixboxRGBToLatent(rgb3);
+//
+//      // mix 30% of rgb1, 60% of rgb2, and 10% of rgb3
+//      MixboxLatent z_mix = 0.3*z1 + 0.6*z2 + 0.1*z3;
+//
+//      float3 rgb_mix = MixboxLatentToRGB(z_mix);
+//
+//   PIGMENT COLORS
+//
+//      Cadmium Yellow              0.996, 0.925, 0.000
+//      Hansa Yellow                0.988, 0.827, 0.000
+//      Cadmium Orange              1.000, 0.412, 0.000
+//      Cadmium Red                 1.000, 0.153, 0.008
+//      Quinacridone Magenta        0.502, 0.008, 0.180
+//      Cobalt Violet               0.306, 0.000, 0.259
+//      Ultramarine Blue            0.098, 0.000, 0.349
+//      Cobalt Blue                 0.000, 0.129, 0.522
+//      Phthalo Blue                0.051, 0.106, 0.267
+//      Phthalo Green               0.000, 0.235, 0.196
+//      Permanent Green             0.027, 0.427, 0.086
+//      Sap Green                   0.420, 0.580, 0.016
+//      Burnt Sienna                0.482, 0.282, 0.000
+//
+//   LICENSING
+//
+//      If you want to obtain commercial license, please
+//      contact us at: mixbox@scrtwpns.com
+//
+
+#ifndef MIXBOX_INCLUDED
+#define MIXBOX_INCLUDED
+
+#ifndef UNITY_COLORSPACE_GAMMA
+    #define MIXBOX_COLORSPACE_LINEAR
+#endif
+
+#ifndef MIXBOX_LUT
+    #ifdef SAMPLE_TEXTURE2D_LOD
+        #define MIXBOX_LUT(UV) SAMPLE_TEXTURE2D_LOD(_MixboxLUT, sampler_MixboxLUT, UV, 0)
+    #else
+        #define MIXBOX_LUT(UV) tex2D(_MixboxLUT, UV)
+    #endif
+#endif
+
+typedef float3x3 MixboxLatent;
+
+float3 MixboxEvalPolynomial(float3 c)
+{
+    float c0 = c[0];
+    float c1 = c[1];
+    float c2 = c[2];
+    float c3 = 1.0 - (c0 + c1 + c2);
+
+    float c00 = c0 * c0;
+    float c11 = c1 * c1;
+    float c22 = c2 * c2;
+    float c01 = c0 * c1;
+    float c02 = c0 * c2;
+    float c12 = c1 * c2;
+    float c33 = c3 * c3;
+
+    return (c0*c00) * float3(+0.07717053, +0.02826978, +0.24832992) +
+           (c1*c11) * float3(+0.95912302, +0.80256528, +0.03561839) +
+           (c2*c22) * float3(+0.74683774, +0.04868586, +0.00000000) +
+           (c3*c33) * float3(+0.99518138, +0.99978149, +0.99704802) +
+           (c00*c1) * float3(+0.04819146, +0.83363781, +0.32515377) +
+           (c01*c1) * float3(-0.68146950, +1.46107803, +1.06980936) +
+           (c00*c2) * float3(+0.27058419, -0.15324870, +1.98735057) +
+           (c02*c2) * float3(+0.80478189, +0.67093710, +0.18424500) +
+           (c00*c3) * float3(-0.35031003, +1.37855826, +3.68865000) +
+           (c0*c33) * float3(+1.05128046, +1.97815239, +2.82989073) +
+           (c11*c2) * float3(+3.21607125, +0.81270228, +1.03384539) +
+           (c1*c22) * float3(+2.78893374, +0.41565549, -0.04487295) +
+           (c11*c3) * float3(+3.02162577, +2.55374103, +0.32766114) +
+           (c1*c33) * float3(+2.95124691, +2.81201112, +1.17578442) +
+           (c22*c3) * float3(+2.82677043, +0.79933038, +1.81715262) +
+           (c2*c33) * float3(+2.99691099, +1.22593053, +1.80653661) +
+           (c01*c2) * float3(+1.87394106, +2.05027182, -0.29835996) +
+           (c01*c3) * float3(+2.56609566, +7.03428198, +0.62575374) +
+           (c02*c3) * float3(+4.08329484, -1.40408358, +2.14995522) +
+           (c12*c3) * float3(+6.00078678, +2.55552042, +1.90739502);
+}
+
+float3 MixboxSRGBToLinear(float3 rgb)
+{
+    return (rgb >= 0.04045) ? pow((abs(rgb) + 0.055) / 1.055, 2.4) : rgb/12.92;
+}
+
+float3 MixboxLinearToSRGB(float3 rgb)
+{
+    return (rgb >= 0.0031308) ? 1.055*pow(abs(rgb), 1.0/2.4) - 0.055 : 12.92*rgb;
+}
+
+MixboxLatent MixboxRGBToLatent(float3 rgb)
+{
+#ifdef MIXBOX_COLORSPACE_LINEAR
+    rgb = MixboxLinearToSRGB(saturate(rgb));
+#else
+    rgb = saturate(rgb);
+#endif
+
+    float x = rgb.r * 63.0;
+    float y = rgb.g * 63.0;
+    float z = rgb.b * 63.0;
+
+    float iz = floor(z);
+
+    float x0 = fmod(iz, 8.0) * 64.0;
+    float y0 = floor(iz / 8.0) * 64.0;
+
+    float x1 = fmod(iz + 1.0, 8.0) * 64.0;
+    float y1 = floor((iz + 1.0) / 8.0) * 64.0;
+
+    float2 uv0 = float2(x0 + x + 0.5, 512.0 - (y0 + y + 0.5)) / 512.0;
+    float2 uv1 = float2(x1 + x + 0.5, 512.0 - (y1 + y + 0.5)) / 512.0;
+
+    float3 c = lerp(MIXBOX_LUT(uv0).rgb, MIXBOX_LUT(uv1).rgb, z - iz);
+
+    return MixboxLatent(c, rgb - MixboxEvalPolynomial(c), 0.0, 0.0, 0.0);
+}
+
+float3 MixboxLatentToRGB(MixboxLatent latent)
+{
+    float3 rgb = saturate(MixboxEvalPolynomial(latent[0]) + latent[1]);
+
+#ifdef MIXBOX_COLORSPACE_LINEAR
+    return MixboxSRGBToLinear(rgb);
+#else
+    return rgb;
+#endif
+}
+
+float3 MixboxLerp(float3 color1, float3 color2, float t)
+{
+    return MixboxLatentToRGB((1.0-t)*MixboxRGBToLatent(color1) + t*MixboxRGBToLatent(color2));
+}
+
+float4 MixboxLerp(float4 color1, float4 color2, float t)
+{
+    return float4(MixboxLerp(color1.rgb, color2.rgb, t), lerp(color1.a, color2.a, t));
+}
+
+#endif

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mixbox.h

@@ -1,35 +0,0 @@
-// MIXBOX v1.2 (c) 2022 Secret Weapons
-// This is for non-commercial use only.
-// Contact: mixbox@scrtwpns.com
-
-#ifndef MIXBOX_H_
-#define MIXBOX_H_
-
-#define MIXBOX_NUMLATENTS 7
-
-void mixbox_lerp_srgb8(unsigned char r1,unsigned char g1,unsigned char b1,
-                       unsigned char r2,unsigned char g2,unsigned char b2,
-                       float t,
-                       unsigned char* out_r,unsigned char* out_g,unsigned char* out_b);
-
-void mixbox_lerp_srgb32f(float r1,float g1,float b1,
-                         float r2,float g2,float b2,
-                         float t,
-                         float* out_r,float* out_g,float* out_b);
-
-void mixbox_srgb8_to_latent(unsigned char r,unsigned char g,unsigned char b,float* out_latent);
-void mixbox_latent_to_srgb8(float* latent,unsigned char* out_r,unsigned char* out_g,unsigned char* out_b);
-
-void mixbox_srgb32f_to_latent(float r,float g,float b,float* out_latent);
-void mixbox_latent_to_srgb32f(float* latent,float* out_r,float* out_g,float* out_b);
-
-
-void mixbox_lerp_srgb8_dither(unsigned char r1,unsigned char g1,unsigned char b1,
-                              unsigned char r2,unsigned char g2,unsigned char b2,
-                              float t,
-                              float dither_r,float dither_g,float dither_b,
-                              unsigned char* out_r,unsigned char* out_g,unsigned char* out_b);
-
-void mixbox_latent_to_srgb8_dither(float* latent,float dither_r,float dither_g,float dither_b,unsigned char* out_r,unsigned char* out_g,unsigned char* out_b);
-
-#endif

package.json

@@ -0,0 +1,29 @@
+{
+  "name": "com.scrtwpns.mixbox",
+  "version": "2.0.0",
+  "displayName": "Mixbox",
+  "description": "Pigment-Based Color Mixing",
+  "unity": "2019.3",
+  "author": {
+    "name": "Secret Weapons",
+    "email": "mixbox@scrtwpns.com",
+    "url": "https://scrtwpns.com"
+  },
+  "samples": [
+  {
+    "displayName": "Built-in Samples",
+    "description": "Contains sample shaders for the Built-in Render Pipelne",
+    "path": "Samples~/SamplesBuiltin"
+  },
+  {
+    "displayName": "URP Samples",
+    "description": "Contains sample shaders for the Universal Render Pipelne",
+    "path": "Samples~/SamplesURP"
+  },
+  {
+    "displayName": "HDRP Samples",
+    "description": "Contains sample shaders for the High Definition Render Pipelne",
+    "path": "Samples~/SamplesHDRP"
+  }
+  ]
+}

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