light_world.lua/lib/shaders/material.lua

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return [[//
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extern Image material;
vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords) {
vec4 normal = Texel(texture, texture_coords);
if(normal.a == 1.0) {
return Texel(material, vec2(normal.x, normal.y));
} else {
return vec4(0.0);
}
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}
]]