create hilbert worms shader

Assets/test/HilbertWorms.mat

@@ -0,0 +1,86 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!21 &2100000
+Material:
+  serializedVersion: 8
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: HilbertWorms
+  m_Shader: {fileID: 4800000, guid: ffd4b487556580abdbc3004e8739afd7, type: 3}
+  m_ValidKeywords: []
+  m_InvalidKeywords: []
+  m_LightmapFlags: 4
+  m_EnableInstancingVariants: 0
+  m_DoubleSidedGI: 0
+  m_CustomRenderQueue: -1
+  stringTagMap: {}
+  disabledShaderPasses: []
+  m_SavedProperties:
+    serializedVersion: 3
+    m_TexEnvs:
+    - _BumpMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _DetailAlbedoMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _DetailMask:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _DetailNormalMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _EmissionMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _MainTex:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _MetallicGlossMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _OcclusionMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _ParallaxMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    m_Ints:
+    - _Speed: 60
+    m_Floats:
+    - _BumpScale: 1
+    - _Cutoff: 0.5
+    - _DetailNormalMapScale: 1
+    - _DstBlend: 0
+    - _GlossMapScale: 1
+    - _Glossiness: 0.5
+    - _GlossyReflections: 1
+    - _Level: 6
+    - _Metallic: 0
+    - _Mode: 0
+    - _OcclusionStrength: 1
+    - _Parallax: 0.02
+    - _SmallLen: 32
+    - _SmoothnessTextureChannel: 0
+    - _SpecularHighlights: 1
+    - _Speed: 128
+    - _SrcBlend: 1
+    - _UVSec: 0
+    - _Worms: 4
+    - _ZWrite: 1
+    m_Colors:
+    - _Color: {r: 1, g: 1, b: 1, a: 1}
+    - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}
+    - _WormColor: {r: 1, g: 0.5, b: 1, a: 1}
+  m_BuildTextureStacks: []

Assets/test/HilbertWorms.mat.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 7ee38dc50e5510195a0e2aed30c051a9
+NativeFormatImporter:
+  externalObjects: {}
+  mainObjectFileID: 2100000
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/test/HilbertWorms.shader

@@ -0,0 +1,107 @@
+Shader "CrispyPin/HilbertWorms" {
+Properties {
+	_Speed ("Speed (px/s)", Integer) = 100
+	[IntRange]_Worms ("Worms", Range(1,10)) = 1
+	[IntRange]_Level ("Level", Range(2,9)) = 3
+	[IntRange]_SmallLen ("Small length", Range(1,32)) = 8
+	_WormColor ("worm color", Color) = (1, 0.5, 1, 1)
+}
+SubShader {
+Tags { "RenderType"="Opaque" }
+LOD 100
+Pass {
+CGPROGRAM
+#pragma vertex vert
+#pragma fragment frag
+
+#include "UnityCG.cginc"
+
+#define SPEED _Speed
+#define WORM_COUNT _Worms
+#define LEVELS _Level
+#define PIXEL_COUNT (1 << (2 * LEVELS + 2 - WORM_COUNT))
+#define SMALL_LEN _SmallLen
+
+float _Speed;
+uint _Worms;
+uint _Level;
+uint _SmallLen;
+float3 _WormColor;
+
+struct appdata {
+	float4 vertex : POSITION;
+	float2 uv : TEXCOORD0;
+	UNITY_VERTEX_INPUT_INSTANCE_ID
+};
+
+struct v2f {
+	float2 uv : TEXCOORD0;
+	float4 vertex : SV_POSITION;
+	UNITY_VERTEX_OUTPUT_STEREO
+};
+
+v2f vert (appdata v) {
+	v2f o;
+	UNITY_SETUP_INSTANCE_ID(v);
+	UNITY_INITIALIZE_OUTPUT(v2f, o);
+	UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
+	o.vertex = UnityObjectToClipPos(v.vertex);
+	o.uv = v.uv;
+	return o;
+}
+
+float4 frag (v2f i) : SV_Target {
+	uint pos = 0;
+	uint mask = 1 << (2 * LEVELS);
+	float2 p = i.uv * 2 - 1;
+	for (uint level = 0; level < LEVELS; level += 1) {
+		bool lower_half = false;
+		bool lower_quarter = false;
+		if (p.x < 0) {
+			lower_half = true;
+			p.x = (p.x * 2) + 1.0;
+			p.y *= -1;
+		} else {
+			pos |= mask;
+			p.x = (p.x - 0.5) * 2;
+		}
+		if (p.y < 0) {
+			p.y = (p.y * 2) + 1.0;
+			pos |= mask/2;
+		} else {
+			lower_quarter = true;
+			p.y = (p.y - 0.5) * 2;
+		}
+		if (lower_half && lower_quarter) {
+			p = float2(-p.y, p.x);
+		} else if (lower_half && !lower_quarter) {
+			p.y *= -1;
+		} else if (!lower_half && !lower_quarter) {
+			p = -p.yx;
+		}
+		mask >>= 2;
+	}
+
+	uint time = ((uint)(_Time.y * SPEED)) % PIXEL_COUNT;
+	uint distance = (time - pos) % PIXEL_COUNT;
+	if (distance < SMALL_LEN) {
+		float worm = 1 - ((float)distance / SMALL_LEN);
+		return float4(_WormColor * worm, 1);
+	} else {
+		// distance = (time/32 - pos/32) % (PIXEL_COUNT/32);
+		// const int tail_length = 4;
+		// if (distance < tail_length) {
+		// 	float tail = ((float)distance / tail_length);
+		// 	tail = 1-abs(1-tail*2);
+		// 	return float4(tail, tail/8, 0, 1);
+		// }
+	}
+	// if ((time - pos) % PIXEL_COUNT <= n){
+	// 	return 1 - ((float)((time - pos) % PIXEL_COUNT) / n);
+	// }
+	return 0;
+}
+ENDCG
+}
+}
+}

Assets/test/HilbertWorms.shader.meta

@@ -0,0 +1,10 @@
+fileFormatVersion: 2
+guid: ffd4b487556580abdbc3004e8739afd7
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  preprocessorOverride: 0
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/test/TestProps.unity

@@ -294,7 +294,7 @@ GameObject:
   - component: {fileID: 252760296}
   - component: {fileID: 252760295}
   m_Layer: 0
-  m_Name: Fold
+  m_Name: HilbertWorms
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0
@@ -313,8 +313,8 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   type: 3
-  objectId: 
+  objectId: 529809e7-483f-45fb-9d21-a5a0c823ce87
-  randomNum: 82958344
+  randomNum: 94923040
   unityVersion: 2021.3.41f1
   cckVersion: 3.10:132
 --- !u!114 &252760296
@@ -389,7 +389,7 @@ MeshRenderer:
   m_RenderingLayerMask: 1
   m_RendererPriority: 0
   m_Materials:
-  - {fileID: 2100000, guid: 23bf1d7dc807b903f80e2228a8334182, type: 2}
+  - {fileID: 2100000, guid: 7ee38dc50e5510195a0e2aed30c051a9, type: 2}
   m_StaticBatchInfo:
     firstSubMesh: 0
     subMeshCount: 0
@@ -1828,7 +1828,7 @@ Transform:
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 1500710831}
   m_LocalRotation: {x: 0, y: 1, z: 0, w: 0}
-  m_LocalPosition: {x: 0, y: 1, z: 1}
+  m_LocalPosition: {x: -2, y: 0, z: 1}
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_ConstrainProportionsScale: 0
   m_Children: []

Assets/test/uninit.shader

@@ -1,51 +1,41 @@
-Shader "CrispyPin/uninit"
+Shader "CrispyPin/uninit" {
+Properties {}
+SubShader {
+Tags { "RenderType"="Transparent" }
+LOD 100
+Pass
 {
-	Properties
+CGPROGRAM
-	{
+#pragma vertex vert
-	}
+#pragma fragment frag
-	SubShader
-	{
-		Tags { "RenderType"="Transparent" }
-		LOD 100
 
-		Pass
+#include "UnityCG.cginc"
-		{
-			CGPROGRAM
-			#pragma vertex vert
-			#pragma fragment frag
 
-			#include "UnityCG.cginc"
+struct appdata {
+	float4 vertex : POSITION;
+	UNITY_VERTEX_INPUT_INSTANCE_ID
+};
 
-			struct appdata
+struct v2f {
-			{
+	float4 vertex : SV_POSITION;
-				float4 vertex : POSITION;
+	UNITY_VERTEX_OUTPUT_STEREO
-				UNITY_VERTEX_INPUT_INSTANCE_ID
+};
-			};
 
-			struct v2f
+v2f vert (appdata v) {
-			{
+	v2f o;
-				float4 vertex : SV_POSITION;
+	UNITY_SETUP_INSTANCE_ID(v);
-				UNITY_VERTEX_OUTPUT_STEREO
+	UNITY_INITIALIZE_OUTPUT(v2f, o);
-			};
+	UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
-
+	o.vertex = UnityObjectToClipPos(v.vertex);
-			v2f vert (appdata v)
+	return o;
-			{
+}
-				v2f o;
+
-				UNITY_SETUP_INSTANCE_ID(v);
+fixed4 frag (v2f i) : SV_Target {
-				UNITY_INITIALIZE_OUTPUT(v2f, o);
+	fixed4 col;
-				UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
+	col.a = 0.5f;
-
+	return col;
-				o.vertex = UnityObjectToClipPos(v.vertex);
+}
-				return o;
+ENDCG
-			}
+}
-
+}
-			fixed4 frag (v2f i) : SV_Target
-			{
-				fixed4 col;
-				col.a = 0.5f;
-				return col;
-			}
-			ENDCG
-		}
-	}
 }