#version 330 core

uniform sampler2D tex0;
uniform sampler2D tex1;
uniform vec2 originalSize;

in vec2 v_texCoord0;

out vec4 o_color;

void main() {
    vec2 size = textureSize(tex0, 0);
    vec2 fixUp = v_texCoord0;
    fixUp.y = 1.0 - fixUp.y;
    fixUp *= (size/originalSize);
    fixUp.y = 1.0 - fixUp.y;
    vec2 pixelPosition = fixUp;
    vec2 centroidPixelPosition = texture(tex0, v_texCoord0).xy;
    vec2 pixelDistance = (centroidPixelPosition - pixelPosition) * size * vec2(1.0, -1.0);
    float threshold = texture(tex1, v_texCoord0).r;
    o_color = vec4(pixelDistance, threshold, 1.0);
}