Hi again,
After some desperate attempts to do some derivative supersampling, I’m turning to the community again and hope someone can help me.
The LED shader I use is the following:
Shader "Custom/pixelate" {
Properties{
_ResolutionX ("ResolutionX", int) = 100
_ResolutionY ("ResolutionY", int) = 100
_Samples ("Samples", int) = 5
_Radius ("LED Radius", float) = 1.0
_MainTex ("Main Texture", 2D) = "white" {}
_ChromaColor ("Chroma color", color) = (1.0, 1.0, 1.0)
_Feather ("Feather", Range(0, 1)) = 0.0
_Size ("Size", float) = 1.0
}
SubShader {
Pass {
Tags { "RenderType"="Transparent" }
Blend SrcAlpha OneMinusSrcAlpha
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
#pragma target 3.0
float _ResolutionX;
float _ResolutionY;
float _Samples;
sampler2D _MainTex;
float _Radius;
fixed4 _ChromaColor;
float _Feather;
float _Size;
float2 texCoords[9];
struct appdata {
float4 vertex : POSITION;
float2 texcoord0 : TEXCOORD;
};
struct v2f
{
float4 pos : SV_POSITION;
float2 uv0 : TEXCOORD;
};
v2f vert(appdata IN) {
v2f OUT;
OUT.pos = mul (UNITY_MATRIX_MVP, IN.vertex);
OUT.uv0 = IN.texcoord0;
return OUT;
}
fixed4 frag(v2f IN) : COLOR {
float4 avgColor; //will hold our averaged color from our sample points
float2 texCoordsStep = 1.0/(float2(float(_ResolutionX),float(_ResolutionX))/float(_Size)); //width of "pixel region" in texture coords
float2 pixelRegionCoords = frac(IN.uv0.xy/texCoordsStep); //x and y coordinates within "pixel region"
float2 pixelBin = floor(IN.uv0.xy/texCoordsStep); //"pixel region" number counting away from base case
float2 inPixelStep = texCoordsStep/3.0; //width of "pixel region" divided by 3 (for KERNEL_SIZE = 9, 3x3 square)
float2 inPixelHalfStep = inPixelStep/2.0;
//use offset (pixelBin * texCoordsStep) from base case (the lower left corner of billboard) to compute texCoords
texCoords[0] = float2(inPixelHalfStep.x, inPixelStep.y*2.0 + inPixelHalfStep.y) + pixelBin * texCoordsStep;
texCoords[1] = float2(inPixelStep.x + inPixelHalfStep.x, inPixelStep.y*2.0 + inPixelHalfStep.y) + pixelBin * texCoordsStep;
texCoords[2] = float2(inPixelStep.x*2.0 + inPixelHalfStep.x, inPixelStep.y*2.0 + inPixelHalfStep.y) + pixelBin * texCoordsStep;
texCoords[3] = float2(inPixelHalfStep.x, inPixelStep.y + inPixelHalfStep.y) + pixelBin * texCoordsStep;
texCoords[4] = float2(inPixelStep.x + inPixelHalfStep.x, inPixelStep.y + inPixelHalfStep.y) + pixelBin * texCoordsStep;
texCoords[5] = float2(inPixelStep.x*2.0 + inPixelHalfStep.x, inPixelStep.y + inPixelHalfStep.y) + pixelBin * texCoordsStep;
texCoords[6] = float2(inPixelHalfStep.x, inPixelHalfStep.y) + pixelBin * texCoordsStep;
texCoords[7] = float2(inPixelStep.x + inPixelHalfStep.x, inPixelHalfStep.y) + pixelBin * texCoordsStep;
texCoords[8] = float2(inPixelStep.x*2.0 + inPixelHalfStep.x, inPixelHalfStep.y) + pixelBin * texCoordsStep;
//take average of 9 pixel samples
avgColor = tex2D(_MainTex, texCoords[0]) +
tex2D(_MainTex, texCoords[1]) +
tex2D(_MainTex, texCoords[2]) +
tex2D(_MainTex, texCoords[3]) +
tex2D(_MainTex, texCoords[4]) +
tex2D(_MainTex, texCoords[5]) +
tex2D(_MainTex, texCoords[6]) +
tex2D(_MainTex, texCoords[7]) +
tex2D(_MainTex, texCoords[8]);
avgColor /= float(9.0);
//blend between fragments in the circle and out of the circle defining our "pixel region"
//Equation of a circle: (x - h)^2 + (y - k)^2 = r^2
float2 powers = pow(abs(pixelRegionCoords - 0.5),float2(2.0, 2.0));
float radiusSqrd = pow(_Radius,2.0);
float gradient = smoothstep(radiusSqrd-_Feather, radiusSqrd+_Feather, powers.x+powers.y);
fixed4 fragcolor = lerp(avgColor, float4(0.1,0.1,0.1,0.0), gradient);
return fragcolor;
}
ENDCG
}
}
}
If you try it you’ll see that you can very easily create an LED display. That is until you watch it from a distance. See the first post to see what I mean.
Now I tried to apply supersampling and shader antialising. I even tried the techniques from this GLSL shader.
I just can’t seem to make this work in the LED shader. Can someone change the code to implement some supersampling technique to make sure the LED display still looks OK from a distance?
Any help would be greatly appreciated.
Thanks you.
