mirror of
https://github.com/tanema/light_world.lua.git
synced 2024-12-24 20:24:19 +00:00
31 lines
1.2 KiB
GLSL
31 lines
1.2 KiB
GLSL
extern vec2 screenHeight = vec2(800.0, 600.0);
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extern float time = 0.0;
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vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords){
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vec2 pSize = 1.0 / screenHeight;
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float brightness = 1.0;
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float offsetX = sin(texture_coords.y * 10.0 + time * 2.0) * pSize.x;
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if(texture_coords.x < 0.5) {
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if(texture_coords.y < 0.5) {
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brightness = min(texture_coords.x * texture_coords.y * 100.0, 1.0);
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} else {
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brightness = min(texture_coords.x * (1.0 - texture_coords.y) * 100.0, 1.0);
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}
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} else {
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if(texture_coords.y < 0.5) {
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brightness = min((1.0 - texture_coords.x) * texture_coords.y * 100.0, 1.0);
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} else {
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brightness = min((1.0 - texture_coords.x) * (1.0 - texture_coords.y) * 100.0, 1.0);
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}
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}
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float red = Texel(texture, vec2(texture_coords.x + offsetX, texture_coords.y + pSize.y * 0.5)).r;
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float green = Texel(texture, vec2(texture_coords.x + offsetX, texture_coords.y - pSize.y * 0.5)).g;
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float blue = Texel(texture, vec2(texture_coords.x + offsetX, texture_coords.y)).b;
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if(mod(texture_coords.y * screenHeight.y, 2.0) > 0.5) {
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return vec4(vec3(red, green, blue) * brightness, 1.0);
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} else {
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return vec4(vec3(red * 0.75, green * 0.75, blue * 0.75) * brightness, 1.0);
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}
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} |