source: data/branches/Shader_HS18/programs/GLSL150/ASCIIFP.glsl @ 12292

#version 150

in vec4 pos;
in vec2 oUv0;
out vec4 fragColour;

uniform sampler2D RT;
uniform sampler3D chars;
uniform vec2 numTiles;
uniform vec2 iNumTiles;
uniform vec2 iNumTiles2;
uniform vec4 lum;
uniform float charBias;

void main()
{
    vec3 local;

        //sample RT
        local.xy = mod(oUv0, iNumTiles);
        vec2 middle = oUv0 - local.xy;
        local.xy = local.xy * numTiles;
        
        //iNumTiles2 = iNumTiles / 2
        middle = middle + iNumTiles2;
        vec4 c = texture(RT, middle);
        
        //multiply luminance by charbias , beacause not all slices of the ascii
        //volume texture are used
        local.z = dot(c , lum)*charBias;
        
        //fix to brighten the dark pixels with small characters
        //c *= lerp(2.0,1.0, local.z);
        
        c *= texture(chars, local);
        fragColour = c;
}