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38 lines
945 B
Plaintext
38 lines
945 B
Plaintext
// from https://github.com/godotengine/godot-demo-projects/blob/master/2d/sprite_shaders/sprite_shaders.tscn
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shader_type canvas_item;
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render_mode blend_premul_alpha;
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// This shader only works properly with premultiplied alpha blend mode.
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uniform float aura_width = 2.0;
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uniform vec4 aura_color : source_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, -aura_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, aura_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(-aura_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(aura_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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col.rgb *= col.a;
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COLOR = col;
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COLOR.rgb += aura_color.rgb * (maxa - mina);
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}
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