61 lines
1.6 KiB
Plaintext
61 lines
1.6 KiB
Plaintext
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[gd_resource type="Shader" format=3 uid="uid://bpswjmm8i01cg"]
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[resource]
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code = "shader_type canvas_item;
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render_mode blend_premul_alpha;
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uniform sampler2D gradient;
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uniform vec2 from;
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uniform vec2 delta;
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uniform int type;
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float angle(vec2 dir) {
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return atan(dir.x / dir.y) / PI * 0.5 + (dir.y < 0.0 ? 0.75 : 0.25);
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}
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void fragment() {
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if (texture(TEXTURE, UV).r < 0.5) discard;
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float pos;
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switch (type)
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{
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case 0: // Line
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// Stolen again from:
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// https://iquilezles.org/articles/forgot-the-exact-link
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vec2 delta_rotated = vec2(-delta.y, delta.x);
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vec2 diff = UV - from;
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float h = dot(diff, delta_rotated) / dot(delta_rotated, delta_rotated);
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if (dot(diff, delta) > 0.0)
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pos = length(diff - h * delta_rotated) / length(delta);
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break;
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case 1: // Line Mirrored
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vec2 delta_rotated = vec2(-delta.y, delta.x);
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float h = dot(UV - from, delta_rotated) / dot(delta_rotated, delta_rotated);
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pos = length(UV - from - h * delta_rotated) / length(delta);
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break;
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case 2: // Radial
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pos = length(UV - from) / length(delta);
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break;
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case 3: // Conic
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vec2 dir = (UV - from);
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pos = mod(angle(dir) - angle(delta), 1.0);
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break;
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case 4: // Bounds
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vec2 abs_delta = abs(delta);
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vec2 abs_from = from;
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if (delta.x < 0.0) abs_from.x -= abs_delta.x;
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if (delta.y < 0.0) abs_from.y -= abs_delta.y;
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pos = min(
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min(UV.x - abs_from.x, abs_delta.x - UV.x + abs_from.x),
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min(UV.y - abs_from.y, abs_delta.y - UV.y + abs_from.y)
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) / min(abs_delta.x, abs_delta.y) * 2.0;
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break;
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}
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COLOR = texture(gradient, vec2(clamp(pos, 0.0, 0.999999), 0.5));
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}
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"
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