28 lines
1.2 KiB
Text
28 lines
1.2 KiB
Text
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shader_type spatial;
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render_mode unshaded, cull_back;
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// Pattern PNGs are data maps rather than colored artwork. Black selects the
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// base color and the red, green, and blue channels select the three authored
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// accent colors. Alpha is intentionally ignored so artists may leave unused
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// UV space transparent.
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uniform sampler2D pattern_texture : filter_linear_mipmap_anisotropic, repeat_disable;
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uniform vec4 base_color : source_color = vec4(1.0);
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uniform vec4 red_zone_color : source_color = vec4(0.9, 0.8, 0.6, 1.0);
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uniform vec4 green_zone_color : source_color = vec4(0.4, 0.2, 0.1, 1.0);
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uniform vec4 blue_zone_color : source_color = vec4(0.7, 0.2, 0.15, 1.0);
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void fragment() {
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vec3 zone_weights = max(texture(pattern_texture, UV).rgb, vec3(0.0));
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float zone_total = zone_weights.r + zone_weights.g + zone_weights.b;
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// Filtering between two authored zone colors can produce a sum near one.
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// Normalize only an overfull sample, retaining smooth black-to-zone edges.
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zone_weights /= max(zone_total, 1.0);
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float base_weight = 1.0 - min(zone_total, 1.0);
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ALBEDO = (
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base_color.rgb * base_weight
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+ red_zone_color.rgb * zone_weights.r
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+ green_zone_color.rgb * zone_weights.g
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+ blue_zone_color.rgb * zone_weights.b
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);
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}
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