#version 420
#extension GL_ARB_texture_gather : enable
// shader 9fad3b3505a6d831
// Used for: Vertical Blur (Captain Toad Treasure Tracker)
const float blurFactor = 1.0; //Higher is less blur

// Implementation of http://rastergrid.com/blog/2010/09/efficient-gaussian-blur-with-linear-sampling/
layout(binding = 0) uniform sampler2D textureUnitPS0;
layout(location = 0) in vec4 passParameterSem0;
layout(location = 0) out vec4 passPixelColor0;

uniform float weight[] = float[](0.18571429, 0.28870130, 0.10363636, 0.01480519);
uniform float offset[] = float[](0.00000000, 1.42105263, 3.31578947, 5.21052632);

ivec2 inputRes = textureSize(textureUnitPS0, 0);
vec2 outputRes = vec2(float(inputRes.x), float(inputRes.y));
vec2 scale = outputRes * blurFactor;
void main()
{
	vec2 R0f = vec2(passParameterSem0.x, passParameterSem0.w);
	vec4 R1f = texture(textureUnitPS0, R0f) * weight[0];
	for (int i = 1; i<4; i++) {
		R1f += texture(textureUnitPS0, R0f + (vec2(0.0, offset[i]) / scale)) * weight[i];
		R1f += texture(textureUnitPS0, R0f - (vec2(0.0, offset[i]) / scale)) * weight[i];
	}
	passPixelColor0 = R1f;
}