Create/Update assets for version 1.19-pre1

assets/minecraft/shaders/program/notch.fsh

@@ -0,0 +1,25 @@
+#version 150
+
+uniform sampler2D DiffuseSampler;
+uniform sampler2D DitherSampler;
+
+in vec2 texCoord;
+
+uniform vec2 InSize;
+
+out vec4 fragColor;
+
+void main() {
+    vec2 halfSize = InSize * 0.5;
+
+    vec2 steppedCoord = texCoord;
+    steppedCoord.x = float(int(steppedCoord.x*halfSize.x)) / halfSize.x;
+    steppedCoord.y = float(int(steppedCoord.y*halfSize.y)) / halfSize.y;
+
+    vec4 noise = texture(DitherSampler, steppedCoord * halfSize / 4.0);
+    vec4 col = texture(DiffuseSampler, steppedCoord) + noise * vec4(1.0/12.0, 1.0/12.0, 1.0/6.0, 1.0);
+    float r = float(int(col.r*8.0))/8.0;
+    float g = float(int(col.g*8.0))/8.0;
+    float b = float(int(col.b*4.0))/4.0;
+    fragColor = vec4(r, g, b, 1.0);
+}