31 lines
713 B
GLSL
31 lines
713 B
GLSL
shader_type canvas_item;
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uniform float outline_width = 2.0;
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uniform vec4 outline_color: hint_color;
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void fragment() {
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vec4 col = texture(TEXTURE, UV);
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vec2 ps = TEXTURE_PIXEL_SIZE;
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float a;
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float maxa = col.a;
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float mina = col.a;
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a = texture(TEXTURE, UV + vec2(0.0, -outline_width) * ps).a;
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maxa = max(a, maxa);
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mina = min(a, mina);
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a = texture(TEXTURE, UV + vec2(0.0, outline_width) * ps).a;
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maxa = max(a, maxa);
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mina = min(a, mina);
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a = texture(TEXTURE, UV + vec2(-outline_width, 0.0) * ps).a;
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maxa = max(a, maxa);
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mina = min(a, mina);
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a = texture(TEXTURE, UV + vec2(outline_width, 0.0) * ps).a;
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maxa = max(a, maxa);
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mina = min(a, mina);
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COLOR = mix(col, outline_color, maxa - mina);
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}
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