anki-3d-engine/shaders/DownscaleBlur.frag.glsl

// Copyright (C) 2009-2017, Panagiotis Christopoulos Charitos and contributors.
// All rights reserved.
// Code licensed under the BSD License.
// http://www.anki3d.org/LICENSE

#include "shaders/Common.glsl"

layout(ANKI_TEX_BINDING(0, 0)) uniform sampler2D u_tex;

layout(location = 0) in vec2 in_uv;
layout(location = 0) out vec3 out_color;

void main()
{
	const vec2 TEXEL_SIZE = 1.0 / TEXTURE_SIZE;

	out_color = textureLod(u_tex, in_uv, 0.0).rgb;
	out_color += textureLod(u_tex, in_uv + TEXEL_SIZE, 0.0).rgb;
	out_color += textureLod(u_tex, in_uv - TEXEL_SIZE, 0.0).rgb;
	out_color += textureLod(u_tex, in_uv + vec2(TEXEL_SIZE.x, -TEXEL_SIZE.y), 0.0).rgb;
	out_color += textureLod(u_tex, in_uv + vec2(-TEXEL_SIZE.x, TEXEL_SIZE.y), 0.0).rgb;

	out_color /= 5.0;
}