Tweak code

frontend/src/scripts/drawing/webgl2-renderer.ts

@@ -20,7 +20,7 @@ export class WebGl2Renderer implements Drawer {
   private distanceFieldFrameBuffer: IntermediateFrameBuffer;
   private lightingFrameBuffer: DefaultFrameBuffer;
 
-  private targetDeltaTime = (1 / 50) * 1000;
+  private targetDeltaTime = (1 / 30) * 1000;
   private deltaTimeError = (1 / 1000) * 1000;
   private additiveQualityIncrease = 0.05;
   private multiplicativeQualityDecrease = 1.5;

frontend/src/scripts/objects/types/tunnel.ts

@@ -7,6 +7,7 @@ export interface Line {}
 
 export class Tunnel extends GameObject {
   private boundingCircle: Circle;
+  private tangent: vec2;
 
   constructor(
     private from: vec2,
@@ -20,12 +21,15 @@ export class Tunnel extends GameObject {
       vec2.fromValues(from.x / 2 + to.x / 2, from.y / 2 + to.y / 2),
       radiusFrom + radiusTo + vec2.distance(from, to)
     );
+
+    this.tangent = vec2.subtract(vec2.create(), to, from);
+
     this.addCommandExecutor(DrawCommand, this.draw.bind(this));
   }
 
   private draw(c: DrawCommand) {
     if (c.drawer.isOnScreen(this.boundingCircle)) {
-      c.drawer.appendToUniformList('lines', this.from, this.to);
+      c.drawer.appendToUniformList('lines', this.from, this.tangent);
       c.drawer.appendToUniformList('radii', this.radiusFrom, this.radiusTo);
     }
   }

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
     );
 }

frontend/src/shaders/lights-shading-fs.glsl

@@ -3,10 +3,9 @@
 precision mediump float;
 
 #define INFINITY 1000.0
-#define LIGHT_COUNT 10
+#define LIGHT_COUNT 8
 #define AMBIENT_LIGHT vec3(0.15)
-#define LIGHT_DROP 800.0
-#define SHADOW_BIAS 0.01
+#define LIGHT_DROP 400.0
 
 uniform struct Light {
     vec2 center;
@@ -17,9 +16,6 @@ uniform struct Light {
 uniform sampler2D distanceTexture;
 uniform vec2 viewBoxSize;
 
-float square(in float a) {
-    return a*a;
-}
 
 float getDistance(in vec2 target, out vec3 color) {
     vec4 values = texture(distanceTexture, target);
@@ -44,14 +40,14 @@ float getFractionOfLightArriving(
 
     direction /= viewBoxSize;
 
-    for (int j = 0; j < 64; j++) {
+    for (int j = 0; j < 48; j++) {
         float minDistance = getDistance(target + direction * rayLength);
         movingAverageMeanDistance = movingAverageMeanDistance / 2.0 + minDistance / 2.0;
         q = min(q, movingAverageMeanDistance / rayLength);
-        rayLength = min(lightDistance, rayLength + max(1.0, minDistance));
+        rayLength = min(lightDistance, rayLength + max(5.0, minDistance));
     }
 
-    return smoothstep(0.0, 1.0, (q - SHADOW_BIAS) * (lightDistance + lightRadius) / lightRadius);
+    return clamp(q * (lightDistance + lightRadius) / lightRadius, 0.0, 1.0);
 }
 
 vec3 getPixelColor(in vec2 worldCoordinates, in vec2 uvCoordinates) {
@@ -63,19 +59,22 @@ vec3 getPixelColor(in vec2 worldCoordinates, in vec2 uvCoordinates) {
     for (int i = 0; i < LIGHT_COUNT; i++) {
         Light light = lights[i];
         
-        float lightDistance = distance(worldCoordinates, light.center) - light.radius;
-        vec3 lightColorAtPosition = light.value / square(max(0.0, lightDistance / LIGHT_DROP) + 1.0);
-        vec2 lightDirection = normalize(light.center - worldCoordinates);
+        vec2 lightDelta = light.center - worldCoordinates;
+        float lightDistance = length(lightDelta);
+        vec2 lightDirection = lightDelta / lightDistance;
+
+        float r = lightDistance / LIGHT_DROP + 1.0;
+        vec3 lightColorAtPosition = light.value / (r * r);
 
         float fractionOfLightArriving = getFractionOfLightArriving(
             uvCoordinates, lightDirection, startingDistance, 
-            max(0.0, lightDistance), light.radius
+            lightDistance, light.radius
         );
 
         result += colorAtPosition * lightColorAtPosition * fractionOfLightArriving;
     }
     
-    return clamp(result, 0.0, 1.0);
+    return result;
 }
 
 in vec2 worldCoordinates;