Some improvements

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

@@ -1,95 +0,0 @@
-#version 300 es
-
-precision lowp float;
-
-#define LINE_COUNT {lineCount}
-#define BLOB_COUNT {blobCount}
- 
-uniform float maxMinDistance;
-uniform float pixelSize;
-
-in vec2 position;
-
-#if LINE_COUNT > 0
-    uniform struct {
-        vec2 from;
-        vec2 toFromDelta;
-        float fromRadius;
-        float toRadius;
-    }[LINE_COUNT] lines;
-
-    void lineMinDistance(inout float minDistance, inout float color) {
-        float myMinDistance = maxMinDistance;
-        for (int i = 0; i < LINE_COUNT; i++) {
-            vec2 targetFromDelta = position - lines[i].from;
-            vec2 toFromDelta = lines[i].toFromDelta;
-            
-            float h = clamp(
-                dot(targetFromDelta, toFromDelta) / dot(toFromDelta, toFromDelta),
-                0.0, 1.0
-            );
-
-            float lineDistance = -mix(
-                lines[i].fromRadius, lines[i].toRadius, h
-            ) + distance(
-                targetFromDelta, toFromDelta * h
-            );
-
-            myMinDistance = min(myMinDistance, lineDistance);
-        }
-
-        color = mix(0.0, color, step(pixelSize, -myMinDistance));
-
-        minDistance = -myMinDistance;
-    }
-#endif
-
-#if BLOB_COUNT > 0
-    uniform struct {
-        vec2 headCenter;
-        vec2 torsoCenter;
-        vec2 leftFootCenter;
-        vec2 rightFootCenter;
-        float headRadius;
-        float torsoRadius;
-        float footRadius;
-        float k;
-    }[BLOB_COUNT] blobs;
-
-    float circleMinDistance(vec2 circleCenter, float radius) {
-        return distance(position, circleCenter) - radius;
-    }
-
-    void blobMinDistance(inout float minDistance, inout float color) {
-        for (int i = 0; i < BLOB_COUNT; i++) {
-            float res = exp2(-blobs[i].k * circleMinDistance(blobs[i].headCenter, blobs[i].headRadius));
-            res += exp2(-blobs[i].k * circleMinDistance(blobs[i].torsoCenter, blobs[i].torsoRadius));
-            res += exp2(-blobs[i].k * circleMinDistance(blobs[i].leftFootCenter, blobs[i].footRadius));
-            res += exp2(-blobs[i].k * circleMinDistance(blobs[i].rightFootCenter, blobs[i].footRadius));
-            res = -log2(res) / blobs[i].k;
-
-            color = mix(1.0, color, step(pixelSize, res));
-            
-            minDistance = min(minDistance, res);
-        }
-    }
-#endif
-
-out vec2 fragmentColor;
-
-void main() {
-    float minDistance = -maxMinDistance;
-    float color = 0.0;
-
-    #if LINE_COUNT > 0
-        lineMinDistance(minDistance, color);
-    #endif
-
-    #if BLOB_COUNT > 0
-        blobMinDistance(minDistance, color);
-        //fragmentColor = vec2(-1.0, 2.0);
-        //return;
-    #endif
-
-    fragmentColor = vec2(minDistance, color);
-}