source: data/branches/Shader_HS18/programs/Example/GLSLES/NightVisionFP.glsles @ 12091

#version 300 es
precision mediump int;
precision mediump float;

out vec4 fragColour;

uniform sampler2D RT;
uniform lowp sampler3D noiseVol;

in vec2 oUv0;
uniform vec4 lum;
uniform float time;

void main()
{
        vec4 oC;
        oC = texture(RT, oUv0);
        
        //obtain luminence value
        oC = vec4(dot(oC,lum));
        
        //add some random noise
        oC += 0.2 *(texture(noiseVol, vec3(oUv0*5.0,time)))- 0.05;
        
        //add lens circle effect
        //(could be optimised by using texture)
        float dist = distance(oUv0, vec2(0.5,0.5));
        oC *= smoothstep(0.5,0.45,dist);
        
        //add rb to the brightest pixels
        oC.rb = vec2(max(oC.r - 0.75, 0.0)*4.0);
        
        fragColour = oC;
}