From e7c6414c2e1dbfd2c2070329d447d096e6907f18 Mon Sep 17 00:00:00 2001
From: hunterk <hunter_kaller@yahoo.com>
Date: Mon, 19 Mar 2018 13:33:20 -0500
Subject: [PATCH] add smart-blur shader

---
 blurs/smart-blur.slang | 107 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 blurs/smart-blur.slang

diff --git a/blurs/smart-blur.slang b/blurs/smart-blur.slang
new file mode 100644
index 0000000..c67aa46
--- /dev/null
+++ b/blurs/smart-blur.slang
@@ -0,0 +1,107 @@
+#version 450
+
+/*
+   Hyllian Smart-Blur Shader
+  
+   Copyright (C) 2011-2016 Hyllian - sergiogdb@gmail.com
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+layout(push_constant) uniform Push
+{
+	vec4 SourceSize;
+	vec4 OriginalSize;
+	vec4 OutputSize;
+	uint FrameCount;
+	float SB_RED_THRESHOLD;
+	float SB_GREEN_THRESHOLD;
+	float SB_BLUE_THRESHOLD;
+} params;
+
+#pragma parameter SB_RED_THRESHOLD "Smart Blur Red Threshold" 0.2 0.0 0.6 0.01
+#pragma parameter SB_GREEN_THRESHOLD "Smart Blur Green Threshold" 0.2 0.0 0.6 0.01
+#pragma parameter SB_BLUE_THRESHOLD "Smart Blur Blue Threshold" 0.2 0.0 0.6 0.01
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+	mat4 MVP;
+} global;
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+layout(location = 1) out vec4 t1;
+layout(location = 2) out vec4 t2;
+layout(location = 3) out vec4 t3;
+
+void main()
+{
+	gl_Position = global.MVP * Position;
+	vTexCoord = TexCoord;
+	float dx = params.SourceSize.z;
+	float dy = params.SourceSize.w;
+
+	t1 = vTexCoord.xxxy + vec4(	-dx,	0.0,	dx,	-dy); //  A B C
+	t2 = vTexCoord.xxxy + vec4(	-dx,	0.0,	dx,	0.0); //  D E F
+	t3 = vTexCoord.xxxy + vec4( -dx,	0.0,	dx,	dy); //  G H I
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 1) in vec4 t1;
+layout(location = 2) in vec4 t2;
+layout(location = 3) in vec4 t3;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+// Below the thresholds, blur is applied for each color channel.
+// Threshold is the max color differency among the eight pixel neighbors from central pixel.
+
+bool eq(vec3 c1, vec3 c2) {
+    vec3 df = abs(c1 - c2);
+    return (df.r < params.SB_RED_THRESHOLD) && (df.g < params.SB_GREEN_THRESHOLD) && (df.b < params.SB_BLUE_THRESHOLD);
+}
+
+/*       
+           A  B  C
+           D  E  F 
+           G  H  I
+*/
+
+void main()
+{
+	vec3   A = texture(Source, t1.xw).xyz;
+	vec3   B = texture(Source, t1.yw).xyz;
+	vec3   C = texture(Source, t1.zw).xyz;
+	vec3   D = texture(Source, t2.xw).xyz;
+	vec3   E = texture(Source, t2.yw).xyz;
+	vec3   F = texture(Source, t2.zw).xyz;
+	vec3   G = texture(Source, t3.xw).xyz;
+	vec3   H = texture(Source, t3.yw).xyz;
+	vec3   I = texture(Source, t3.zw).xyz;
+
+	vec3 sum = vec3(0.,0.,0.);
+
+	if (eq(E,F) && eq(E,H) && eq(E,I) && eq(E,B) && eq(E,C) && eq(E,A) && eq(E,D) && eq(E,G))
+	{
+		sum = (E+A+C+D+F+G+I+B+H)/9.0;
+		E = sum;
+	}
+
+	FragColor = vec4(E, 1.0);
+}
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