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28 lines
938 B
Text
28 lines
938 B
Text
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// https://godotshaders.com/shader/color-reduction-and-dither/
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shader_type canvas_item;
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uniform sampler2D selection;
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uniform float colors : hint_range(1.0, 255.0) = 2.0;
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uniform float dither : hint_range(0.0, 0.5) = 0.0;
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void fragment()
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{
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vec4 color = texture(TEXTURE, UV);
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vec4 selection_color = texture(selection, UV);
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float a = floor(mod(UV.x / TEXTURE_PIXEL_SIZE.x, 2.0));
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float b = floor(mod(UV.y / TEXTURE_PIXEL_SIZE.y, 2.0));
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float c = mod(a + b, 2.0);
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vec4 col;
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col.r = (round(color.r * colors + dither) / colors) * c;
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col.g = (round(color.g * colors + dither) / colors) * c;
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col.b = (round(color.b * colors + dither) / colors) * c;
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c = 1.0 - c;
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col.r += (round(color.r * colors - dither) / colors) * c;
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col.g += (round(color.g * colors - dither) / colors) * c;
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col.b += (round(color.b * colors - dither) / colors) * c;
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col.a = color.a;
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vec4 output = mix(color.rgba, col, selection_color.a);
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COLOR = output;
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}
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