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27 lines
1.5 KiB
Plaintext
27 lines
1.5 KiB
Plaintext
#pragma aego abi 1
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#pragma domain sprite
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#include "engine/sprite.glsl"
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#pragma material
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uniform float Thickness; // @instance @default(1) @range(0, 8) @unit("region texels")
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uniform vec4 OutlineColor; // @instance @color @default(0, 0, 0, 1)
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uniform float Opacity; // @instance @default(1) @range(0, 1)
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#pragma end
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// Interior alpha outline. Geometry and culling bounds stay unchanged; samples
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// outside this region are transparent and never read a neighbouring atlas tile.
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void fragment() {
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vec4 color = aego_sample();
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vec2 offsetUV = aego_texel() * max(Thickness, 0.0);
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float neighbour = color.a;
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neighbour = min(neighbour, aego_sample_at(aego_uv + vec2(offsetUV.x, 0.0)).a);
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neighbour = min(neighbour, aego_sample_at(aego_uv - vec2(offsetUV.x, 0.0)).a);
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neighbour = min(neighbour, aego_sample_at(aego_uv + vec2(0.0, offsetUV.y)).a);
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neighbour = min(neighbour, aego_sample_at(aego_uv - vec2(0.0, offsetUV.y)).a);
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neighbour = min(neighbour, aego_sample_at(aego_uv + offsetUV).a);
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neighbour = min(neighbour, aego_sample_at(aego_uv - offsetUV).a);
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neighbour = min(neighbour, aego_sample_at(aego_uv + vec2(offsetUV.x, -offsetUV.y)).a);
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neighbour = min(neighbour, aego_sample_at(aego_uv + vec2(-offsetUV.x, offsetUV.y)).a);
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float innerEdge = clamp((color.a - neighbour) / max(color.a, 0.000001), 0.0, 1.0);
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color.rgb = mix(color.rgb, OutlineColor.rgb * color.a, innerEdge * clamp(OutlineColor.a, 0.0, 1.0));
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aego_out = color * clamp(Opacity, 0.0, 1.0);
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}
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