29 lines
1008 B
GLSL
29 lines
1008 B
GLSL
#define PI 3.14159
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extern float xresolution;
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// Sample from 1D vis-depth map
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float samp(vec2 coord,float r,Image u_texture){
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return step(r,Texel(u_texture,coord).r);
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}
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vec4 effect(vec4 color,Image tex,vec2 tex_coords,vec2 screen_coords){
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// Cartesian to polar, y of 1D sample is always 0
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vec2 norm=tex_coords.st*2.-1.;
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vec2 tc=vec2((atan(norm.y,norm.x)+PI)/(2.*PI),0.);
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float r=length(norm);
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// Enlarge blur parameter by distance, light scattering simulation
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float blur=(1./xresolution)*smoothstep(0.3,1.,r);
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// Simple Gaussian blur
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float sum=// Brightness(0~1)
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samp(vec2(tc.x-3.*blur,tc.y),r,tex)*0.1
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+samp(vec2(tc.x-2.*blur,tc.y),r,tex)*0.13
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+samp(vec2(tc.x-1.*blur,tc.y),r,tex)*0.17
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+samp(tc,r,tex)*0.2// The center tex coord, which gives us hard shadows.
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+samp(vec2(tc.x+1.*blur,tc.y),r,tex)*0.17
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+samp(vec2(tc.x+2.*blur,tc.y),r,tex)*0.13
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+samp(vec2(tc.x+3.*blur,tc.y),r,tex)*0.1;
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// Multiply the distance to get a soft fading
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return vec4(vec3(1.),sum*smoothstep(1.,0.,r));
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} |