#version 430

layout (binding = 0) uniform sampler2D colorSamp;
layout (binding = 1) uniform sampler2D ssaoSamp;
layout (binding = 2) uniform sampler2D shadowSamp;

uniform bool useSSAO;

in vec2 varTex;

out vec4 color;

void main()
{
    if(useSSAO)
    {
        color = vec4(texture(colorSamp, varTex).xyz * (texture(ssaoSamp, varTex).r + 0.5), 1.0);
    }
    else
    {
        color = vec4(texture(colorSamp, varTex).xyz, 1.0);
    }

    vec2 texelSize = 1.0 / vec2(textureSize(shadowSamp, 0));
    float result = 0.0;
    const int radius = 5;
    for(int x = -radius; x < radius; x++) 
    {
        for(int y = -radius; y < radius; y++) 
        {
            vec2 offset = vec2(float(x), float(y)) * texelSize;
            result += texture(shadowSamp, varTex + offset).r;
        }
    }
    result /= (radius * radius * 4);
    result = result * 0.5 + 0.5;
    color *= result;
}