Tweak code

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

@@ -3,47 +3,35 @@
 precision mediump float;
 
 #define INFINITY 200.0
-#define LINE_COUNT 50
+#define LINE_COUNT 30
+#define CAVE_COLOR vec3(0.36, 0.38, 0.76)
+#define AIR_COLOR vec3(0.7)
 
+// start, end - start
 uniform vec2[LINE_COUNT * 2] lines;
+// startRadius, endRadois
 uniform float[LINE_COUNT * 2] radii;
 
-float lineDistance(
-    in vec2 target, 
-    in vec2 start, 
-    in vec2 end, 
-    in float radiusFrom, 
-    in float radiusTo
-) {
-    vec2 pa = target - start, ba = end - start;
-    float baLength = length(ba);
-    float h = clamp(dot(pa / baLength, ba / baLength), 0.0, 1.0);
-    return length(pa - ba * h) - mix(radiusFrom, radiusTo, h);
-}
-
-float getDistance(in vec2 target) {
-    float minDistance = INFINITY;
-
-    for (int i = 0; i < LINE_COUNT; i++) {
-        vec2 start = lines[2 * i];
-        vec2 end = lines[2 * i + 1];
-        float rFrom = radii[2 * i];
-        float rTo = radii[2 * i + 1];
-        minDistance = min(minDistance, lineDistance(target, start, end, rFrom, rTo));
-    }
-
-    return -minDistance;
-}
-
 in vec2 worldCoordinates;
 out vec4 fragmentColor;
 
 void main() {
-    float distance = getDistance(worldCoordinates);
-    const vec3 caveColor = vec3(0.36, 0.38, 0.76);
-    const vec3 airColor = vec3(1.0);
+    float minDistance = INFINITY;
+
+    for (int i = 0; i < LINE_COUNT; i++) {
+        vec2 pa = worldCoordinates - lines[2 * i];
+        vec2 ba = lines[2 * i + 1];
+        float baLength = length(ba);
+        float h = clamp(dot(pa / baLength, ba / baLength), 0.0, 1.0);
+        float lineDistance = distance(pa, ba * h) - mix(radii[2 * i], radii[2 * i + 1], h);
+
+        minDistance = min(minDistance, lineDistance);
+    }
+
+    float distance = -minDistance;
+
     fragmentColor = vec4(
-        mix(caveColor, airColor, clamp(distance, 0.0, 1.0)),
+        mix(CAVE_COLOR, AIR_COLOR, clamp(distance, 0.0, 1.0)),
         distance / 32.0
     );
 }