window mode and botany wip

2022-05-31 15:39:24 +10:00
1 parent f0aa6495c7
commit 0f9576a67b
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+Shader "FullScreen/Botany"
+{
+    Properties
+    {
+        _SpectrumTexture("SpectrumTexture", 2D) = "white" {}
+        _ThemeTexture("ThemeTexture", 2D) = "white" {}
+        _SpectrumSize("SpectrumSize", float) = 16
+
+        _Zoom("Zoom", range(-2, 2)) = 0.5
+        _Wildness("Wildness", range(1, 10)) = 4.0
+        _Brightness("Brightness", range(1, 10)) = 4.0
+    }
+
+    HLSLINCLUDE
+
+    // HDRP stuff
+    #pragma vertex Vert
+    #pragma target 4.5
+    #pragma only_renderers d3d11 playstation xboxone xboxseries vulkan metal switch
+    #include "Packages/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/RenderPass/CustomPass/CustomPassCommon.hlsl"
+
+    // here we go...
+    sampler2D _SpectrumTexture;
+    sampler2D _ThemeTexture;
+    float _Zoom;
+    float _Wildness;
+    float _Brightness;
+
+    float material;
+    float time;
+    float rng;
+
+    // -------------------------------------
+    // https://www.shadertoy.com/view/NddSWs
+    // source
+
+    // Dave Hoskins
+    // https://www.shadertoy.com/view/4djSRW
+    float hash13(float3 p3) {
+        p3  = frac(p3 * .1031);
+        p3 += dot(p3, p3.zyx + 31.32);
+        return frac((p3.x + p3.y) * p3.z);
+    }
+
+    // Inigo Quilez
+    // https://iquilezles.org/articles/distfunctions
+    float smin( float d1, float d2, float k ) {
+        float h = clamp( 0.5 + 0.5*(d2-d1)/k, 0.0, 1.0 );
+        return lerp( d2, d1, h ) - k*h*(1.0-h); }
+
+    float smoothing(float d1, float d2, float k) { return clamp( 0.5 + 0.5*(d2-d1)/k, 0.0, 1.0 ); }
+
+    // rotation matrix
+    float2x2 rot(float a) {
+        float2x2 rm = {cos(a),-sin(a),sin(a),cos(a) };
+        return rm;
+    }
+
+    float3 repeat(float3 p, float r) {
+        return (p % r) / 2.0;
+    }
+
+    // sdf
+    float map (float3 p) {
+        // time stretched with noise
+        float t = time*1. + rng*0.9;
+
+        // domain repetition
+        float grid = 5.0;
+        float3 cell = floor(p/grid);
+        p = repeat(p, grid);
+
+        // distance from origin
+        float dp = length(p);
+
+        // rotation parameter
+        float3 angle = float3(.1,-.5,.1) + dp*.5 + p*.1 + cell;
+
+        // shrink sphere size
+        float size = sin(rng*3.14);
+
+        // stretch sphere
+        float wave = sin(-dp*1.+t+hash13(cell)*6.28)*.5;
+
+        // kaleidoscopic iterated function
+        const int count = 4;
+        float a = 1.0;
+        float scene = 1000.0;
+        float shape = 1000.0;
+        for (int index = 0; index < count; ++index) {
+            // fold and translate
+            p.xz = abs(p.xz)-(.5+wave)*a;
+
+            // rotate
+            p.xz = mul(rot(angle.y/a), p.xz);
+            p.yz = mul(rot(angle.x/a), p.yz);
+            p.yx = mul(rot(angle.z/a), p.yx);
+
+            // p.xz = mul(p.xz, rot(angle.y/a));
+            // p.yz = mul(p.yz, rot(angle.x/a));
+            // p.yx = mul(p.yx, rot(angle.z/a));
+
+            // sphere
+            shape = length(p)-0.2*a*size;
+
+            // material blending
+            material = lerp(material, float(index), smoothing(shape, scene, 0.3*a));
+
+            // add with a blend
+            scene = smin(scene, shape, 1.0 * a);
+
+            // falloff transformations
+            a /= 1.9;
+        }
+
+        return scene;
+    }
+
+    float4 FullScreenPass(Varyings varyings) : SV_Target {
+        float depth = LoadCameraDepth(varyings.positionCS.xy);
+        PositionInputs posInput = GetPositionInput(varyings.positionCS.xy, _ScreenSize.zw, depth, UNITY_MATRIX_I_VP, UNITY_MATRIX_V);
+        float2 ndc = posInput.positionNDC;
+        float2 guv = posInput.positionNDC - 0.5;
+
+        // musique
+        float sub = tex2D(_SpectrumTexture, 0.0);
+        float bass = tex2D(_SpectrumTexture, 0.25);
+        float mids = tex2D(_SpectrumTexture, 0.50);
+        float highs = tex2D(_SpectrumTexture, 0.75);
+        float4 spectrum = float4(sub, bass, mids, highs);
+
+        time = _Time.y;
+
+        float4 colour = float4(0.0, 0.0, 0.0, 1.0);
+        material = 0.0;
+
+        // white noise
+        float3 seed = float3(guv, time);
+        float rng = hash13(seed);
+
+        // camera coordinates
+        float2 uv = guv;
+        float3 eye = float3(1.0, 1.0, 1.0);
+        float3 at = float3(0.0, 0.0, 0.0);
+        float3 z = normalize(at-eye);
+        float3 x = normalize(cross(z, float3(0,1,0)));
+        float3 y = cross(x, z);
+        float3 ray = normalize(float3(z + uv.x * x + uv.y * y));
+        float3 pos = eye;
+
+        // // camera control
+        float2 M = 6.28 * float2(1.0, 1.0);
+        ray.xz = mul(ray.xz, rot(M.x));
+        pos.xz = mul(pos.xz, rot(M.x));
+        ray.xy = mul(ray.xy, rot(M.y));
+        pos.xy = mul(pos.xy, rot(M.y));
+
+        // raymarch
+        float steps = 30.0;
+        float index;
+        for (index = steps; index > 0.0; --index) {
+            // volume estimation
+            float dist = map(pos);
+            if (dist < 0.01) {
+                break;
+            }
+
+            // dithering
+            dist *= 0.9 + .1 * rng;
+
+            // raymarch
+            pos += ray * dist;
+        }
+
+        // ambient occlusion from steps count
+        float shade = index / steps;
+
+        // compute normal by NuSan (https://www.shadertoy.com/view/3sBGzV)
+        float2 off=float2(.001,0);
+        float3 normal = normalize(map(pos)-float3(map(pos-off.xyy), map(pos-off.yxy), map(pos-off.yyx)));
+
+        // Inigo Quilez color palette (https://iquilezles.org/articles/palettes)
+        float3 tint = .5+.5*cos(float3(3.0,2.0,1.0)+material*.5+length(pos)*.5);
+
+        // lighting
+        float ld = dot(reflect(ray, normal), float3(0,1,0))*0.5+0.5;
+        float3 light = float3(1.000,0.502,0.502) * sqrt(ld);
+        ld = dot(reflect(ray, normal), float3(0,0,-1))*0.5+0.5;
+        light += float3(0.400,0.714,0.145) * sqrt(ld)*.5;
+
+        // pixel color
+        colour = float4((tint + light) * shade, 1.0);
+        colour = float4(tint * shade, 1.0);
+
+        // temporal buffer
+        // colour = max(colour, texture(iChannel0, fragCoord/iResolution.xy) - 0.01);
+
+        return colour;
+    }
+
+    ENDHLSL
+
+    SubShader
+    {
+        Tags{ "RenderPipeline" = "HDRenderPipeline" }
+        Pass
+        {
+            Name "Botany"
+
+            ZWrite Off
+            ZTest Always
+            // Blend SrcAlpha OneMinusSrcAlpha
+            Cull Off
+
+            HLSLPROGRAM
+                #pragma fragment FullScreenPass
+            ENDHLSL
+        }
+    }
+    Fallback Off
+}
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