#version 330

in vec2 texCoord0;

uniform sampler2D texture0;
uniform vec2 resolution = vec2(800, 600); // static to reduce uniform calls
uniform bool horizontal;
uniform int samples;

out vec4 outColor;


void main(void)
{
	vec3 colorSum = vec3(0, 0, 0);
	int iterations = 0;

	if (horizontal)
	{
		for (int i = -samples; i <= samples; i++)
		{
			colorSum += texture(texture0, texCoord0 + vec2(i, 0.0) / resolution).rgb;
			iterations++;
		}
	}
	else
	{
		for (int i = -samples; i <= samples; i++)
		{
			colorSum += texture(texture0, texCoord0 + vec2(0.0, i) / resolution).rgb;
			iterations++;
		}
	}
	outColor = vec4(colorSum / iterations, 1);
}