#version 150

in vec2 vertTexCoord;

uniform sampler2DRect colorTexture;

out vec4 fragColor;

void main() {
	float changePerTexel = fwidth(vertTexCoord.x);
	vec2 nearestNeighborTexCoord = vertTexCoord;
	nearestNeighborTexCoord.x = floor(nearestNeighborTexCoord.x) + 0.5;
	nearestNeighborTexCoord.y = floor(nearestNeighborTexCoord.y) + 0.5;
	vec2 difference = nearestNeighborTexCoord - vertTexCoord;
	vec2 edgeDistance = vec2(0.5 - abs(difference.x), 0.5 - abs(difference.y));
	vec2 biasedTexCoord = vertTexCoord + difference * min(vec2(1.0, 1.0), edgeDistance / (changePerTexel / 2));
	fragColor = texture(colorTexture, biasedTexCoord);
}