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25 lines
843 B
25 lines
843 B
1 year ago
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// Adapted from Leafshade Interactive's outline shader
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// explained and shown in https://youtu.be/yh1Kdr37RmI.
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shader_type canvas_item;
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uniform vec4 line_color : source_color = vec4(1.0);
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uniform float line_thickness : hint_range(0.0, 10.0) = 2.0;
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void fragment() {
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vec2 size = TEXTURE_PIXEL_SIZE * line_thickness;
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float outline =
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texture(TEXTURE, UV + vec2( size.x, 0)).a +
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texture(TEXTURE, UV + vec2(-size.x, 0)).a +
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texture(TEXTURE, UV + vec2(0, size.y)).a +
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texture(TEXTURE, UV + vec2(0, -size.y)).a +
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texture(TEXTURE, UV + vec2( size.x, size.y)).a +
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texture(TEXTURE, UV + vec2(-size.x, size.y)).a +
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texture(TEXTURE, UV + vec2(-size.x, -size.y)).a +
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texture(TEXTURE, UV + vec2( size.x, -size.y)).a;
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float alpha = min(outline, 1.0) - texture(TEXTURE, UV).a;
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COLOR = vec4(line_color.rgb, line_color.a * alpha);
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}
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