36 lines
953 B
GLSL
36 lines
953 B
GLSL
#version 300 es
|
|
|
|
precision mediump float;
|
|
|
|
#define INFINITY 200.0
|
|
#define LINE_COUNT {lineCount}
|
|
#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;
|
|
|
|
in vec2 worldCoordinates;
|
|
out vec4 fragmentColor;
|
|
|
|
void main() {
|
|
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(CAVE_COLOR, AIR_COLOR, clamp(distance, -10.0, 0.0) / 10.0 + 1.0),
|
|
distance / 32.0
|
|
);
|
|
}
|