Create/Update assets for version 19w08a

assets/minecraft/shaders/program/blur.fsh

@@ -0,0 +1,31 @@
+#version 120
+
+uniform sampler2D DiffuseSampler;
+
+varying vec2 texCoord;
+varying vec2 oneTexel;
+
+uniform vec2 InSize;
+
+uniform vec2 BlurDir;
+uniform float Radius;
+
+void main() {
+    vec4 blurred = vec4(0.0);
+    float totalStrength = 0.0;
+    float totalAlpha = 0.0;
+    float totalSamples = 0.0;
+    for(float r = -Radius; r <= Radius; r += 1.0) {
+        vec4 sample = texture2D(DiffuseSampler, texCoord + oneTexel * r * BlurDir);
+
+		// Accumulate average alpha
+        totalAlpha = totalAlpha + sample.a;
+        totalSamples = totalSamples + 1.0;
+
+		// Accumulate smoothed blur
+        float strength = 1.0 - abs(r / Radius);
+        totalStrength = totalStrength + strength;
+        blurred = blurred + sample;
+    }
+    gl_FragColor = vec4(blurred.rgb / (Radius * 2.0 + 1.0), totalAlpha);
+}