38 lines
1.1 KiB
Plaintext
38 lines
1.1 KiB
Plaintext
shader_type canvas_item;
|
|
|
|
varying vec2 quad_uv;
|
|
|
|
uniform vec2 ball_0;
|
|
uniform vec2 ball_1;
|
|
uniform vec2 ball_2;
|
|
uniform vec2 rect_size = vec2(1920, 1080);
|
|
uniform float ball_radius = 12.0;
|
|
uniform float cam_zoom = 1.0;
|
|
uniform vec2 cam_pos = vec2(0.0);
|
|
uniform float threshold : hint_range(0.0, 1.0) = 0.5;
|
|
uniform vec4 color : source_color = vec4(0.3, 0.5, 0.2, 1.0);
|
|
uniform sampler2D noise_tex : repeat_enable;
|
|
|
|
void vertex() {
|
|
quad_uv = UV;
|
|
}
|
|
|
|
float field(vec2 pos) {
|
|
return (ball_radius * cam_zoom) / max(length(quad_uv * rect_size - pos), 1.0);
|
|
}
|
|
|
|
void fragment() {
|
|
float sum = field(ball_0) + field(ball_1) + field(ball_2);
|
|
float a = smoothstep(threshold - 0.05, threshold, sum);
|
|
|
|
vec2 screen_px = quad_uv * rect_size;
|
|
vec2 world_px = (screen_px - rect_size * 0.5) / cam_zoom + cam_pos;
|
|
float n1 = texture(noise_tex, world_px * 0.0005).r;
|
|
float n2 = texture(noise_tex, world_px * 0.0008 + 0.33).r;
|
|
float hue_shift = (n1 - 0.5) * 0.12;
|
|
float value_shift = (n2 - 0.5) * 0.15;
|
|
vec3 shifted = color.rgb + vec3(hue_shift * 0.5, hue_shift, -hue_shift * 0.5) + value_shift;
|
|
|
|
COLOR = vec4(shifted, a * color.a);
|
|
}
|