revert to vanilla assets

public/assets/minecraft/shaders/post/bits.fsh

@@ -0,0 +1,35 @@
+#version 330
+
+uniform sampler2D InSampler;
+
+in vec2 texCoord;
+
+layout(std140) uniform SamplerInfo {
+    vec2 OutSize;
+    vec2 InSize;
+};
+
+layout(std140) uniform BitsConfig {
+    float Resolution;
+    float MosaicSize;
+};
+
+out vec4 fragColor;
+
+const float Saturation = 1.5;
+
+void main() {
+    vec2 oneTexel = 1.0 / InSize;
+    vec2 mosaicInSize = InSize / MosaicSize;
+    vec2 fractPix = fract(texCoord * mosaicInSize) / mosaicInSize;
+
+    vec4 baseTexel = texture(InSampler, texCoord - fractPix);
+
+    vec3 fractTexel = baseTexel.rgb - fract(baseTexel.rgb * Resolution) / Resolution;
+    float luma = dot(fractTexel, vec3(0.3, 0.59, 0.11));
+    vec3 chroma = (fractTexel - luma) * Saturation;
+    baseTexel.rgb = luma + chroma;
+    baseTexel.a = 1.0;
+
+    fragColor = baseTexel;
+}