#version 330 core
in vec2 TexCoords;
out vec4 color;

uniform sampler2D scene;
uniform vec2 offsets[9];
uniform int edge_kernel[9];
uniform float blur_kernel[9];

uniform bool chaos;
uniform bool confuse;
uniform bool shake;


void main ()
{
    color = vec4(0.0, 0.0,0.0,1.0);
    vec3 sample[9];

    if(chaos || shake)
        for (int i = 0; i < 9; i++)
            sample[i] = vec3(texture(scene,TexCoords.st + offsets[i]));
    
    // process effects
    if (chaos) 
    {
        for(int i = 0; i < 9; i ++)
            color += vec4(sample[i] * edge_kernel[i], 0.0);
        color.a = 1.0;
    }
    else if (confuse)
    {
        color = vec4(1.0 - texture(scene, TexCoords).rgb, 1.0);
    }
    else if (shake)
    {
        for (int i = 0; i < 9; i++)
            color += vec4(sample[i] * blur_kernel[i], 0.0);
        color.a = 1.0;
    }
    else
    {
        color = texture(scene, TexCoords);
    }
}