mirror of
https://github.com/tanema/light_world.lua.git
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22 lines
1.1 KiB
GLSL
22 lines
1.1 KiB
GLSL
/*
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Copyright (c) 2014 Tim Anema
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*/
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extern vec3 lightPosition; //the light position on the screen(not global)
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extern vec3 lightColor; //the rgb color of the light
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extern float lightRange; //the range of the light
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extern float lightSmooth; //smoothing of the lights attenuation
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extern vec2 lightGlow = vec2(0.5, 0.5); //how brightly the light bulb part glows
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extern vec4 AmbientColor; //ambient RGBA -- alpha is intensity
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vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords) {
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float dist = distance(lightPosition, vec3(pixel_coords, 1.0));
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//if the pixel is within this lights range
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//calculater attenuation of light based on the distance
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float att = clamp((1.0 - dist / lightRange) / lightSmooth, 0.0, 1.0);
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// if not on the normal map draw attenuated shadows
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vec3 Ambient = AmbientColor.rgb * AmbientColor.a;
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vec3 pixel = lightColor * pow(att, lightSmooth) + pow(smoothstep(lightGlow.x, 1.0, att), lightSmooth) * lightGlow.y;
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return vec4(Ambient + pixel, 1.0);
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}
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