From 5ca4d880711819f0b34e93ea830bbc7a94a2a5d2 Mon Sep 17 00:00:00 2001
From: hunterk <hunter_kaller@yahoo.com>
Date: Sun, 30 Oct 2016 22:28:05 -0500
Subject: [PATCH] add SimoneT's NTSC Colors shader

---
 misc/colorspace-tools.h | 157 ++++++++++++++++++++++++++++++++++++++++
 misc/ntsc-colors.slang  |  39 ++++++++++
 2 files changed, 196 insertions(+)
 create mode 100644 misc/colorspace-tools.h
 create mode 100755 misc/ntsc-colors.slang

diff --git a/misc/colorspace-tools.h b/misc/colorspace-tools.h
new file mode 100644
index 00000000..4f8ebf51
--- /dev/null
+++ b/misc/colorspace-tools.h
@@ -0,0 +1,157 @@
+// Colorspace Tools
+// ported from Asmodean's PsxFX Shader Suite v2.00
+// NTSC color code from SimoneT
+// License: GPL v2+
+
+/*------------------------------------------------------------------------------
+                       [GAMMA CORRECTION CODE SECTION]
+------------------------------------------------------------------------------*/
+
+vec3 EncodeGamma(vec3 color, float gamma)
+{
+    color = clamp(color, 0.0, 1.0);
+    color.r = (color.r <= 0.0404482362771082) ?
+    color.r / 12.92 : pow((color.r + 0.055) / 1.055, gamma);
+    color.g = (color.g <= 0.0404482362771082) ?
+    color.g / 12.92 : pow((color.g + 0.055) / 1.055, gamma);
+    color.b = (color.b <= 0.0404482362771082) ?
+    color.b / 12.92 : pow((color.b + 0.055) / 1.055, gamma);
+
+    return color;
+}
+
+vec3 DecodeGamma(vec3 color, float gamma)
+{
+    color = clamp(color, 0.0, 1.0);
+    color.r = (color.r <= 0.00313066844250063) ?
+    color.r * 12.92 : 1.055 * pow(color.r, 1.0 / gamma) - 0.055;
+    color.g = (color.g <= 0.00313066844250063) ?
+    color.g * 12.92 : 1.055 * pow(color.g, 1.0 / gamma) - 0.055;
+    color.b = (color.b <= 0.00313066844250063) ?
+    color.b * 12.92 : 1.055 * pow(color.b, 1.0 / gamma) - 0.055;
+
+    return color;
+}
+
+#ifdef GAMMA_CORRECTION
+float4 GammaPass(float4 color, vec2 texcoord)
+{
+    const float GammaConst = 2.233333;
+    color.rgb = EncodeGamma(color.rgb, GammaConst);
+    color.rgb = DecodeGamma(color.rgb, float(Gamma));
+
+    return color;
+}
+#endif
+
+//Conversion matrices
+vec3 RGBtoXYZ(vec3 RGB)
+  {
+      const mat3x3 m = mat3x3(
+      0.6068909, 0.1735011, 0.2003480,
+      0.2989164, 0.5865990, 0.1144845,
+      0.0000000, 0.0660957, 1.1162243);
+  
+    return RGB * m;
+  }
+  
+vec3 XYZtoRGB(vec3 XYZ)
+  {
+      const mat3x3 m = mat3x3(
+      1.9099961, -0.5324542, -0.2882091,
+     -0.9846663,  1.9991710, -0.0283082,
+      0.0583056, -0.1183781,  0.8975535);
+  
+    return XYZ * m;
+}
+
+vec3 XYZtoSRGB(vec3 XYZ)
+{
+    const mat3x3 m = mat3x3(
+    3.2404542,-1.5371385,-0.4985314,
+   -0.9692660, 1.8760108, 0.0415560,
+    0.0556434,-0.2040259, 1.0572252);
+
+    return XYZ * m;
+  }
+  
+  vec3 RGBtoYUV(vec3 RGB)
+ {
+     const mat3x3 m = mat3x3(
+     0.2126, 0.7152, 0.0722,
+    -0.09991,-0.33609, 0.436,
+     0.615, -0.55861, -0.05639);
+ 
+     return RGB * m;
+ }
+ 
+ vec3 YUVtoRGB(vec3 YUV)
+ {
+     const mat3x3 m = mat3x3(
+     1.000, 0.000, 1.28033,
+     1.000,-0.21482,-0.38059,
+     1.000, 2.12798, 0.000);
+ 
+      return YUV * m;
+  }
+
+vec3 RGBtoYIQ(vec3 RGB)
+  {
+     const mat3x3 m = mat3x3(
+     0.2989, 0.5870, 0.1140,
+     0.5959, -0.2744, -0.3216,
+     0.2115, -0.5229, 0.3114);
+     return RGB * m;
+  }
+
+vec3 YIQtoRGB(vec3 YIQ)
+  {
+     const mat3x3 m = mat3x3(
+     1.0, 0.956, 0.6210,
+     1.0, -0.2720, -0.6474,
+     1.0, -1.1060, 1.7046);
+   return YIQ * m;
+  }
+  
+vec3 XYZtoYxy(vec3 XYZ)
+  {
+    float w = (XYZ.r + XYZ.g + XYZ.b);
+      vec3 Yxy;
+    Yxy.r = XYZ.g;
+    Yxy.g = XYZ.r / w;
+    Yxy.b = XYZ.g / w;
+  
+      return Yxy;
+  }
+  
+  vec3 YxytoXYZ(vec3 Yxy)
+  {
+    vec3 XYZ;
+    XYZ.g = Yxy.r;
+    XYZ.r = Yxy.r * Yxy.g / Yxy.b;
+    XYZ.b = Yxy.r * (1.0 - Yxy.g - Yxy.b) / Yxy.b;
+  
+    return XYZ;
+  }
+
+// conversion from NTSC RGB Reference White D65 ( color space used by NA/Japan TV's ) to XYZ
+ vec3 NTSC(vec3 c)
+ {
+     vec3 v = vec3(pow(c.r, 2.2), pow(c.g, 2.2), pow(c.b, 2.2)); //Inverse Companding
+     return RGBtoXYZ(v);
+ }
+ 
+ // conversion from XYZ to sRGB Reference White D65 ( color space used by windows ) 
+ vec3 sRGB(vec3 c)
+ {
+     vec3 v = XYZtoSRGB(c);
+     v = DecodeGamma(v, 2.4); //Companding
+ 
+     return v;
+ }
+ 
+ // NTSC RGB to sRGB
+ vec3 NTSCtoSRGB( vec3 c )
+ { 
+     return sRGB(NTSC( c )); 
+ }
diff --git a/misc/ntsc-colors.slang b/misc/ntsc-colors.slang
new file mode 100755
index 00000000..52975fc5
--- /dev/null
+++ b/misc/ntsc-colors.slang
@@ -0,0 +1,39 @@
+#version 450
+
+layout(push_constant) uniform Push
+{
+	vec4 SourceSize;
+	vec4 OriginalSize;
+	vec4 OutputSize;
+	uint FrameCount;
+} params;
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+	mat4 MVP;
+} global;
+
+#include "colorspace-tools.h"
+
+#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()
+{
+     vec3 color = texture(Source, vTexCoord).rgb;
+     color = NTSCtoSRGB(color.rgb);
+   FragColor = vec4(color, 1.0);
+}