Initial commit

extracted/assets/minecraft/shaders/include/common.glsl

@@ -0,0 +1,24 @@
+float rdist(vec2 pos, vec2 size, vec4 radius) {
+    radius.xy = (pos.x > 0.0) ? radius.xy : radius.wz;
+    radius.x  = (pos.y > 0.0) ? radius.x : radius.y;
+    
+    vec2 v = abs(pos) - size + radius.x;
+    return min(max(v.x, v.y), 0.0) + length(max(v, 0.0)) - radius.x;
+}
+
+float ralpha(vec2 size, vec2 coord, vec4 radius, float smoothness) {
+    vec2 center = size * 0.5;
+    float dist = rdist(center - (coord * size), center - 1.0, radius);
+    return 1.0 - smoothstep(1.0 - smoothness, 1.0, dist);
+}
+
+const vec2[4] RECT_VERTICES_COORDS = vec2[] (
+    vec2(0.0, 0.0), 
+    vec2(0.0, 1.0), 
+    vec2(1.0, 1.0),
+    vec2(1.0, 0.0)
+);
+
+vec2 rvertexcoord(int id) {
+    return RECT_VERTICES_COORDS[id % 4];
+}