create hilbert worms shader

This commit is contained in:
Crispy 2024-09-12 23:07:46 +02:00
parent e507ae5abf
commit d70686cd51
6 changed files with 251 additions and 50 deletions

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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;
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p.x = (p.x - 0.5) * 2;
}
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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
}
}
}

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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 {
struct appdata
{
float4 vertex : POSITION; float4 vertex : POSITION;
UNITY_VERTEX_INPUT_INSTANCE_ID UNITY_VERTEX_INPUT_INSTANCE_ID
}; };
struct v2f struct v2f {
{
float4 vertex : SV_POSITION; float4 vertex : SV_POSITION;
UNITY_VERTEX_OUTPUT_STEREO UNITY_VERTEX_OUTPUT_STEREO
}; };
v2f vert (appdata v) v2f vert (appdata v) {
{
v2f o; v2f o;
UNITY_SETUP_INSTANCE_ID(v); UNITY_SETUP_INSTANCE_ID(v);
UNITY_INITIALIZE_OUTPUT(v2f, o); UNITY_INITIALIZE_OUTPUT(v2f, o);
UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o); UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
o.vertex = UnityObjectToClipPos(v.vertex); o.vertex = UnityObjectToClipPos(v.vertex);
return o; return o;
} }
fixed4 frag (v2f i) : SV_Target fixed4 frag (v2f i) : SV_Target {
{
fixed4 col; fixed4 col;
col.a = 0.5f; col.a = 0.5f;
return col; return col;
} }
ENDCG ENDCG
} }
} }
} }