31 lines
889 B
Lua
31 lines
889 B
Lua
wiggle = love.graphics.newShader[[
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extern number seed;
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extern number amount;
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int grain = 10; //higher = less, lower = more
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float rand(vec2 co){
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return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
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}
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vec4 effect( vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords) {
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vec4 pixel_me = Texel(texture, texture_coords );
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return Texel(texture, texture_coords + (rand(texture_coords * seed) - .5) * amount);
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/*
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int resolution = int(12 * 1 / zoom);
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vec2 final_coords = floor((resolution * texture_coords) + 0.5) / resolution;
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vec4 averaged_pixel = (Texel(texture, final_coords - (1 / resolution)) + Texel(texture, final_coords)) / 2 + (rand(final_coords * seed) / grain);
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averaged_pixel.a = 1;
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pixel_me = Texel(texture, final_coords);
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return averaged_pixel;
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*/
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}
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]]
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