26 lines
801 B
Plaintext
26 lines
801 B
Plaintext
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shader_type canvas_item;
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render_mode blend_mix;
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uniform sampler2D palette: filter_nearest;
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uniform sampler2D screen_texture : hint_screen_texture, repeat_disable, filter_nearest;
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void fragment()
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{
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vec3 source_col = texture(screen_texture, SCREEN_UV).rgb;
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vec3 closest_col = vec3(0.0);
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float smallest_error = 10.0;
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int palette_size = textureSize(palette, 0).x;
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float palette_pixel_size = 1.0 / float(palette_size);
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for (int x = 0; x < palette_size; x++)
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{
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vec3 palette_col = texture(palette, vec2(float(x) * palette_pixel_size, 0.0)).rgb;
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float error = distance(source_col, palette_col);
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if (error < smallest_error)
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{
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closest_col = palette_col;
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smallest_error = error;
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}
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}
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COLOR.rgb = closest_col;
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}
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