Add dynamic shader generation

frontend/src/shaders/cave-distance-fs.glsl

@@ -3,7 +3,7 @@
 precision mediump float;
 
 #define INFINITY 200.0
-#define LINE_COUNT 30
+#define LINE_COUNT {lineCount}
 #define CAVE_COLOR vec3(0.36, 0.38, 0.76)
 #define AIR_COLOR vec3(0.7)
 
@@ -29,9 +29,8 @@ void main() {
     }
 
     float distance = -minDistance;
-
     fragmentColor = vec4(
-        mix(CAVE_COLOR, AIR_COLOR, clamp(distance, 0.0, 1.0)),
+        mix(CAVE_COLOR, AIR_COLOR, clamp(distance, -10.0, 0.0) / 10.0 + 1.0),
         distance / 32.0
     );
 }