From 570d027900ebaaeaeb3c098fdc140c2441e5ebc2 Mon Sep 17 00:00:00 2001
From: hunterk <hunter_kaller@yahoo.com>
Date: Thu, 4 Aug 2016 07:36:29 -0500
Subject: [PATCH] add color-mangler

---
 misc/color-mangler.slang | 91 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 misc/color-mangler.slang

diff --git a/misc/color-mangler.slang b/misc/color-mangler.slang
new file mode 100644
index 0000000..a0b7c8c
--- /dev/null
+++ b/misc/color-mangler.slang
@@ -0,0 +1,91 @@
+#version 450
+
+layout(push_constant) uniform Push
+{
+	float display_gamma;
+	float target_gamma;
+	float sat;
+	float lum;
+	float cntrst;
+	float r;
+	float g;
+	float b;
+	float rg;
+	float rb;
+	float gr;
+	float gb;
+	float br;
+	float bg;
+	float blr;
+	float blg;
+	float blb;
+} params;
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   mat4 MVP;
+   vec4 OutputSize;
+   vec4 OriginalSize;
+   vec4 SourceSize;
+} global;
+
+/*
+   Color Mangler
+   Author: hunterk
+   License: Public domain
+*/
+#pragma parameter display_gamma "Display Gamma" 2.2 0.0 10.0 0.1
+#pragma parameter target_gamma "Target Gamma" 2.2 0.0 10.0 0.1
+#pragma parameter sat "Saturation" 1.0 0.0 3.0 0.01
+#pragma parameter lum "Luminance" 1.0 0.0 5.0 0.01
+#pragma parameter cntrst "Contrast" 1.0 0.0 2.0 0.01
+#pragma parameter r "Red" 1.0 0.0 2.0 0.01
+#pragma parameter g "Green" 1.0 0.0 2.0 0.01
+#pragma parameter b "Blue" 1.0 0.0 2.0 0.01
+#pragma parameter rg "Red-Green Tint" 0.0 0.0 1.0 0.005
+#pragma parameter rb "Red-Blue Tint" 0.0 0.0 1.0 0.005
+#pragma parameter gr "Green-Red Tint" 0.0 0.0 1.0 0.005
+#pragma parameter gb "Green-Blue Tint" 0.0 0.0 1.0 0.005
+#pragma parameter br "Blue-Red Tint" 0.0 0.0 1.0 0.005
+#pragma parameter bg "Blue-Green Tint" 0.0 0.0 1.0 0.005
+#pragma parameter blr "Black-Red Tint" 0.0 0.0 1.0 0.005
+#pragma parameter blg "Black-Green Tint" 0.0 0.0 1.0 0.005
+#pragma parameter blb "Black-Blue Tint" 0.0 0.0 1.0 0.005
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+
+void main()
+{
+   gl_Position = global.MVP * Position;
+   vTexCoord = TexCoord;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+void main()
+{
+   vec4 screen = pow(texture(Source, vTexCoord), vec4(params.target_gamma)).rgba;
+   vec4 avglum = vec4(0.5);
+   screen = mix(screen, avglum, (1.0 - params.cntrst));
+   
+ //				params.r   params.g    params.b   params.black
+mat4 color = mat4(params.r,  params.rg,  params.rb, 0.0,  //red channel
+			   params.gr,  params.g,   params.gb, 0.0,  //green channel
+			   params.br,  params.bg,  params.b,  0.0,  //blue channel
+			  params.blr, params.blg, params.blb,    0.0); //alpha channel; these numbers do nothing for our purposes.
+			  
+mat4 adjust = mat4((1.0 - params.sat) * 0.3086 + params.sat, (1.0 - params.sat) * 0.3086, (1.0 - params.sat) * 0.3086, 1.0,
+(1.0 - params.sat) * 0.6094, (1.0 - params.sat) * 0.6094 + params.sat, (1.0 - params.sat) * 0.6094, 1.0,
+(1.0 - params.sat) * 0.0820, (1.0 - params.sat) * 0.0820, (1.0 - params.sat) * 0.0820 + params.sat, 1.0,
+0.0, 0.0, 0.0, 1.0);
+	color *= adjust;
+	screen = clamp(screen * params.lum, 0.0, 1.0);
+	screen = color * screen;
+	FragColor = pow(screen, vec4(1.0 / params.display_gamma));
+}
\ No newline at end of file