add fake-crt-geom-potato (#409)

* add fake-crt-geom-potato

* add fake-crt-geom-potato

* Update fake-crt-geom.slang

Add cheap Color Temperature Control

crt/fake-crt-geom-potato.slangp

@@ -0,0 +1,5 @@
+shaders = 1
+
+shader0 = shaders/fake-crt-geom-potato.slang
+filter_linear0 = true
+scale_type0 = viewport

crt/shaders/fake-crt-geom-potato.slang

@@ -0,0 +1,83 @@
+#version 450
+
+// Simple scanlines with curvature and mask effects lifted from crt-geom
+// original by hunterk, edited by DariusG
+
+layout(push_constant) uniform Push
+{
+	vec4 SourceSize;
+	vec4 OriginalSize;
+	vec4 OutputSize;
+	uint FrameCount;
+  float SCANLINE;
+  float cgwg;
+  float boost;
+} params;
+
+// Parameter lines go here:
+
+#pragma parameter boost "Bright boost " 1.00 1.00 2.00 0.02
+#define boost params.boost
+
+#pragma parameter SCANLINE "Scanline Intensity" 0.30 0.0 1.0 0.05
+#define SCANLINE params.SCANLINE
+
+#pragma parameter cgwg "CGWG mask brightness " 0.7 0.0 1.0 0.1
+#define cgwg params.cgwg
+
+#define pi 3.141592654
+	
+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 float omega;
+
+void main()
+{
+	gl_Position = global.MVP * Position;
+	vTexCoord = TexCoord * 1.0001;
+	omega =   pi * params.SourceSize.y * 2.0;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 1) in float omega;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 1) uniform sampler2D Source;
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+// CGWG mask calculation
+	
+      vec3 Mask(float pos)
+      {
+	
+      float mf = fract(pos * 0.5);
+
+      if (mf <0.5) return vec3(1.0,cgwg,1.0);
+      else return vec3(cgwg,1.0,cgwg);
+  
+      }
+
+void main()
+{
+	vec2 pos = vTexCoord.xy;
+	vec3 res = texture(Source, pos).rgb;
+
+	if (params.OriginalSize.y < 400.0)
+	res = res * (1.0 + SCANLINE * sin(pos.y * omega));
+	else res;
+
+// apply the mask
+	res *= Mask(pos.x*params.OutputSize.x * 1.0001);
+	res *= boost;
+
+    FragColor = vec4(res,1.0);
+} 

crt/shaders/fake-crt-geom.slang

@@ -17,6 +17,8 @@ layout(push_constant) uniform Push
   float boost;
   float SHARPNESS;
   float SPEEDUP;	
+  float WP;
+
 } params;
 
 // Parameter lines go here:
@@ -41,6 +43,9 @@ layout(push_constant) uniform Push
 #pragma parameter boost "Bright boost " 1.00 1.00 2.00 0.02
 #define boost params.boost
 
+#pragma parameter WP "Color Temperature" 0.0 -0.25 0.25 0.01
+#define WP params.WP
+
 #pragma parameter SPEEDUP "Speed-up. Warp,Gamma,Corner disabled" 0.0 0.0 1.0 1.0
 #define SPEEDUP params.SPEEDUP
 
@@ -157,6 +162,7 @@ void main()
     vec3 color = scanline(pos.y, res);
     if (SPEEDUP == 0.0) color = pow( color, out_gamma); else color;
     if (SPEEDUP == 0.0 ) color = color*corner(tc);
+	color.rgb *= vec3(1.0+WP,1.0,1.0-WP);
 
     FragColor = vec4(color,1.0) ;