Create/Update assets for version 1.20.4

assets/minecraft/shaders/program/bumpy.vsh

@@ -0,0 +1,17 @@
+#version 150
+
+in vec4 Position;
+
+uniform mat4 ProjMat;
+uniform vec2 InSize;
+
+out vec2 texCoord;
+out vec2 oneTexel;
+
+void main(){
+    vec4 outPos = ProjMat * vec4(Position.xy, 0.0, 1.0);
+    gl_Position = vec4(outPos.xy, 0.2, 1.0);
+
+    oneTexel = 1.0 / InSize;
+    texCoord = outPos.xy * 0.5 + 0.5;
+}