Create/Update assets for version 13w43a

assets/minecraft/shaders/program/bits.fsh

@@ -0,0 +1,26 @@
+#version 120
+
+uniform sampler2D DiffuseSampler;
+
+varying vec2 texCoord;
+varying vec2 oneTexel;
+
+uniform vec2 InSize;
+
+uniform float Resolution = 4.0;
+uniform float Saturation = 1.5;
+uniform float MosaicSize = 8.0;
+
+void main() {
+    vec2 mosaicInSize = InSize / MosaicSize;
+    vec2 fractPix = fract(texCoord * mosaicInSize) / mosaicInSize;
+    
+    vec4 baseTexel = texture2D(DiffuseSampler, texCoord - fractPix);
+    
+    baseTexel = baseTexel - fract(baseTexel * Resolution) / Resolution;
+    float luma = dot(baseTexel.rgb, vec3(0.3, 0.59, 0.11));
+    vec3 chroma = (baseTexel.rgb - luma) * Saturation;
+    baseTexel = vec4(luma + chroma, baseTexel.a);
+
+    gl_FragColor = baseTexel;
+}