ok

minecraft/shaders/program/menu_blur_core.fsh

@@ -0,0 +1,24 @@
+#version 150 core
+
+uniform sampler2D DiffuseSampler;
+
+in vec2 texCoord;
+in vec2 oneTexel;
+
+uniform vec2 InSize;
+
+uniform vec2 BlurDir;
+uniform float Radius;
+uniform float Progress;
+
+out vec4 outColor;
+
+void main() {
+    vec4 blurred = vec4(0.0);
+    float progRadius = floor(Radius * Progress);
+    for (float r = -progRadius; r <= progRadius; r += 1.0) {
+        blurred += texture(DiffuseSampler, texCoord + oneTexel * r * BlurDir);
+    }
+    // force alpha to be 1.0 since otherwise areas with zero alpha turn black?
+    outColor = vec4(blurred.rgb / (progRadius * 2.0 + 1.0), 1.0);
+}