8 lines
244 B
GLSL
8 lines
244 B
GLSL
extern float w,h;
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extern float level;
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vec4 effect(vec4 color,Image tex,vec2 tex_coords,vec2 scr_coords){
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float dx=abs(scr_coords.x/w-0.5);
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float dy=abs(scr_coords.y/h-0.5);
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float a=(max(dx*2.6,dy*1.8)-.626)*level;
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return vec4(1.,0.,0.,a);
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} |