v1.0 of Sony PVM 4K HDR shader that tries to emulate a Sony PVM 20L4 CRT. Again requires a HDR capable screen typically of at least 700 nits (but may need less for OLEDs) This version adds support for different resolution patterns see shader for more details

crt/crt-sony-pvm-4k-hdr.slangp

@@ -1,11 +1,13 @@
 /* 
-A group of shaders that tries to emulate a sony PVM type aperture grille screen but with full brightness. 
+A group of shaders that tries to emulate a Sony PVM type aperture grille screen but with full brightness. 
 
 The novel thing about this group of shaders is that it transforms the image output by the 'console/arcade/computer' into HDR space first i.e brightens it first and then applies 
 an aperture grille afterwards which is kind of what a CRT would actually do - its kind of a kin to the electron beam (but nothing like it lol). 
 
 My HDR 700 monitors does seem to get reasonably close to the brightness of my PVM's - its not quite there but its close.
 
+Currently geared towards a Sony PVM 20L4.
+
 To use:
 Please Enable HDR in RetroArch, 
 
@@ -75,4 +77,7 @@ mipmap_input3 = "false"
 alias3 = ""
 float_framebuffer3 = "false"
 srgb_framebuffer3 = "false"
-ScanlineWidth = "1.000000"
+
+ScanlineWidth = "0.600000"
+Contrast = "4.500000"
+PaperWhiteNits = "500.000000"

crt/shaders/crt-sony-pvm-4k-hdr.slang

@@ -30,12 +30,13 @@ layout(push_constant) uniform Push
     float ScanlineWidth;
     float ScreenWidth;
     float ScreenHeight; 
+    float ResolutionPattern;
 } params;
 
-/* #pragma parameter ScanlineWidth "Scanline Width"  4.0    0.0 20.0   1.0 */
 #pragma parameter ScanlineWidth     "Scanline Width"     0.5    0.0 1.0    0.01 
 #pragma parameter ScreenWidth       "Screen Width"       3840.0 0.0 7680.0 1.0
 #pragma parameter ScreenHeight      "Screen Height"      2160.0 0.0 4320.0 1.0
+#pragma parameter ResolutionPattern "Resolution Pattern" 1.0    0.0 8.0    1.0
 
 layout(std140, set = 0, binding = 0) uniform UBO
 {
@@ -46,35 +47,15 @@ layout(std140, set = 0, binding = 0) uniform UBO
 layout(location = 0) in vec4 Position;
 layout(location = 1) in vec2 TexCoord;
 layout(location = 0) out vec2 vTexCoord;
-layout(location = 1) out float Scale;
 
 void main()
 {
    gl_Position = global.MVP * Position;
    vTexCoord = TexCoord;
-
-   vec2 ScreenSize = max(params.OutputSize.xy, vec2(params.ScreenWidth, params.ScreenHeight));
-
-   if((params.SourceSize.x > ScreenSize.x) || (params.SourceSize.y > ScreenSize.y))
-   {
-	   Scale = 1.0;
-   }
-   else 
-   {
-      float ScaleFactor = 2.0;
-        
-      while(((params.SourceSize.x * ScaleFactor) <= ScreenSize.x) && ((params.SourceSize.y * ScaleFactor) <= ScreenSize.y))
-    	{
-	      ScaleFactor += 1.0;
-      }
-
-	   Scale = ScaleFactor - 1.0;
-   }
 }
 
 #pragma stage fragment
 layout(location = 0) in vec2 vTexCoord;
-layout(location = 1) in float Scale;
 layout(location = 0) out vec4 FragColor;
 layout(set = 0, binding = 2) uniform sampler2D Source;
 layout(set = 0, binding = 3) uniform sampler2D StockPass;
@@ -89,165 +70,171 @@ float ModInteger(float a, float b)
 #define kEuler 2.718281828459
 #define kMax   1.0
 
-#define kGuassianMin   1.1
+#define kGuassianMin   vec3(1.1)
-#define kGuassianMax   3.0
+#define kGuassianMax   vec3(3.0)
 #define Sharpness      2.5
 
+#define kRed     vec3(1.0, 0.0, 0.0)
+#define kGreen   vec3(0.0, 1.0, 0.0)
+#define kBlue    vec3(0.0, 0.0, 1.0)
+#define kMagenta vec3(1.0, 0.0, 1.0)
+#define kYellow  vec3(1.0, 1.0, 0.0)
+#define kCyan    vec3(0.0, 1.0, 1.0)
+#define kBlack   vec3(0.0, 0.0, 0.0)
+#define kWhite   vec3(1.0, 1.0, 1.0)
+
 float Ramp(const float gaussian, float colour)
 {
     return clamp(gaussian * colour, 0.0, 1.0); 
 }
 
+vec3 Ramp3(const vec3 gaussian, vec3 colour)
+{
+    return clamp(gaussian * colour, vec3(0.0), vec3(1.0)); 
+}
+
 void main()
 {
    float ScanlineSize = params.OutputSize.y / params.SourceSize.y; 
 
-   /* vec2 InPixels = (vTexCoord * params.SourceSize.xy) * vec2(Scale); */
    const vec2 InPixels = (vTexCoord * params.OutputSize.xy);
 
    const float ScanlinePosition = (floor(vTexCoord.y * params.SourceSize.y) * ScanlineSize) + (ScanlineSize * 0.5);
 
    float ScanlineDistance = ScanlinePosition - (floor(InPixels.y) + 0.5);
 
-   /*
-   if(ModInteger(floor(InPixels.y), Scale) < params.ScanlineWidth)
-   {
-      FragColor = vec4(texture(Source, vTexCoord).xyz, 1.0);
-   }
-   else
-   {
-      FragColor = vec4(0.0,0.0,0.0,1.0);
-   }
-   */
-
    ScanlineDistance /= ScanlineSize * params.ScanlineWidth;
    ScanlineDistance = clamp(abs(ScanlineDistance * 2.0), 0.0, 1.0);
 
-   /* Gaussian distribution */
+   const float Gaussian = pow(kEuler, -0.5 * pow(ScanlineDistance/0.3, 2.0)); /* Gaussian distribution */
-   const float gaussian = pow(kEuler, -0.5 * pow(ScanlineDistance/0.3, 2.0));
-
-   //const float guassianf = gaussian * clamp(ScanlineSize / 2, 1.2, 5.0);
-   //const float guassian_clamp = clamp(guassianf, 0.0, 1.0); 
 
    float Ratio = (vTexCoord.x * params.SourceSize.x) - (floor(vTexCoord.x * params.SourceSize.x)); 
    Ratio = clamp(((Ratio - 0.5) * Sharpness) + 0.5, 0.0f, 1.0);
 
    const vec2 SourceTexCoord0 = vec2(vTexCoord.x, ScanlinePosition / params.OutputSize.y);
 
-   vec3 hdr_colour0 = texture(Source, SourceTexCoord0).xyz;
+   vec3 HDRColour0 = texture(Source, SourceTexCoord0).xyz;
-   vec3 sdr_colour0 = texture(StockPass, SourceTexCoord0).xyz;
+   vec3 SDRColour0 = texture(StockPass, SourceTexCoord0).xyz;
 
    const vec2 SourceTexCoord1 = vec2(vTexCoord.x + (1.0 / params.SourceSize.x), ScanlinePosition / params.OutputSize.y);
 
-   vec3 hdr_colour1 = texture(Source, SourceTexCoord1).xyz;
+   const vec3 HDRColour1 = texture(Source, SourceTexCoord1).xyz;
-   vec3 sdr_colour1 = texture(StockPass, SourceTexCoord1).xyz;
+   const vec3 SDRColour1 = texture(StockPass, SourceTexCoord1).xyz;
    
-   vec3 hdr_colour  = mix(hdr_colour0, hdr_colour1, vec3(Ratio));
+   const vec3 HDRColour  = mix(HDRColour0, HDRColour1, vec3(Ratio));
-   vec3 sdr_colour  = mix(sdr_colour0, sdr_colour1, vec3(Ratio));
+   const vec3 SDRColour  = mix(SDRColour0, SDRColour1, vec3(Ratio));
    
-   /* TODO: Below needs optimising - just needs a mask array rather than doing if's! Ran out of time */ 
+   vec3 Luminance = Ramp3(vec3(Gaussian), (SDRColour * kGuassianMax) + kGuassianMin); 
 
-#if 0  /* 12 pattern - 8K screens */
+   vec3 OutputColour;
-   float x = ModInteger(floor(InPixels.x), 12.0);
 
-   if(x < 3.0)
+   /* Various resolution patterns - remember your LCD 4K screen will likely be 16:9 whereas
-   {
+   the CRT TV will likely be 4:3 and so higher TVL values will be required on your 16:9 screen
-      float red = Ramp(gaussian, (sdr_colour.x * kGuassianMax) + kGuassianMin); 
+   to get an equivalent TVL seen on a 4:3 CRT TV. 
-      FragColor = vec4(red * hdr_colour.x, 0.0, 0.0, 1.0);
+   Pattern 1's 960TVL at 16:9 is about right for a 800TVL at 4:3.
-   }
+   */
-   else if(x < 4.0)
-   {
-      FragColor = vec4(0.0, 0.0, 0.0, 1.0);  /* black */
-   }
-   else if(x < 7.0)
-   {
-      float green = Ramp(gaussian, (sdr_colour.y * kGuassianMax) + kGuassianMin);
-      FragColor = vec4(0.0, green * hdr_colour.y, 0.0, 1.0);
-   }
-   else if(x < 8.0)
-   {
-      FragColor = vec4(0.0, 0.0, 0.0, 1.0);  /* black */
-   }
-   else if(x < 11.0)
-   {
-      float blue = Ramp(gaussian, (sdr_colour.z * kGuassianMax) + kGuassianMin);
-      FragColor = vec4(0.0, 0.0, blue * hdr_colour.z, 1.0);
-   }
-   else /* if(x < 12.0) */
-   {
-      FragColor = vec4(0.0, 0.0, 0.0, 1.0);  /* black */
-   }
-#endif /* 0 */
 
-#if 0  /* 9 pattern - 8K screens */
+   uint ResolutionPattern = uint(params.ResolutionPattern);
-   float x = ModInteger(floor(InPixels.x), 9.0);
 
-   if(x < 2.0)
+   switch(ResolutionPattern)
    {
-      float red = Ramp(gaussian, (sdr_colour.x * kGuassianMax) + kGuassianMin); 
+      case 0:  /* 2 pattern - 1440TVL (16:9) horiz resolution (too high?) on a 4K screen */
-      FragColor = vec4(red * hdr_colour.x, 0.0, 0.0, 1.0);
-   }
-   else if(x < 3.0)
       {
-      FragColor = vec4(0.0, 0.0, 0.0, 1.0);  /* black */
+         const uint PatternSize = 2;
-   }
+         const vec3 Mask[2] = vec3[]( kYellow, kCyan );
-   else if(x < 5.0)
-   {
-      float green = Ramp(gaussian, (sdr_colour.y * kGuassianMax) + kGuassianMin);
-      FragColor = vec4(0.0, green * hdr_colour.y, 0.0, 1.0);
-   }
-   else if(x < 6.0)
-   {
-      FragColor = vec4(0.0, 0.0, 0.0, 1.0);  /* black */
-   }
-   else if(x < 8.0)
-   {
-      float blue = Ramp(gaussian, (sdr_colour.z * kGuassianMax) + kGuassianMin);
-      FragColor = vec4(0.0, 0.0, blue * hdr_colour.z, 1.0);
-   }
-   else /* if(x < 9.0) */
-   {
-      FragColor = vec4(0.0, 0.0, 0.0, 1.0);  /* black */
-   }
-#endif /* 0 */
       
-#if 1   /* 6 pattern - 4K screens */
+         uint PatternX = uint(ModInteger(floor(InPixels.x), PatternSize));
-   float x = ModInteger(floor(InPixels.x), 6.0);
+         OutputColour = Luminance * HDRColour * Mask[PatternX];
          
-   if(x < 2.0)
+         break;
-   {
-      float red = Ramp(gaussian, (sdr_colour.x * kGuassianMax) + kGuassianMin); 
-      FragColor = vec4(red * hdr_colour.x, 0.0, 0.0, 1.0);
       }
-   else if(x < 4.0)
+      case 1:  /* 3 pattern - 960TVL (16:9) horiz resolution on a 4K screen */
       {  
-      float green = Ramp(gaussian, (sdr_colour.y * kGuassianMax) + kGuassianMin);
+         const uint PatternSize = 3;
-      FragColor = vec4(0.0, green * hdr_colour.y, 0.0, 1.0);
+         const vec3 Mask[3] = vec3[]( kRed, kGreen, kBlue );
-   }
-   else /* if(x < 6.0) */
-   {
-      float blue = Ramp(gaussian, (sdr_colour.z * kGuassianMax) + kGuassianMin);
-      FragColor = vec4(0.0, 0.0, blue * hdr_colour.z, 1.0);
-   }
-#endif /* 1 */
       
-#if 0   /* 3 pattern - 1080-1440p screens */
+         uint PatternX = uint(ModInteger(floor(InPixels.x), PatternSize));
-   float x = ModInteger(floor(InPixels.x), 3.0);
+         OutputColour = Luminance * HDRColour * Mask[PatternX];
       
-   if(x < 1.0)
+         break;
-   {
-      float red = Ramp(gaussian, (sdr_colour.x * kGuassianMax) + kGuassianMin); 
-      FragColor = vec4(red * hdr_colour.x, 0.0, 0.0, 1.0);
       }
-   else if(x < 2.0)
+      case 2:  /* 4 pattern - 720TVL (16:9) horiz resolution on a 4K screen */
       {
-      float green = Ramp(gaussian, (sdr_colour.y * kGuassianMax) + kGuassianMin);
+         const uint PatternSize = 4;
-      FragColor = vec4(0.0, green * hdr_colour.y, 0.0, 1.0);
+         const vec3 Mask[4] = vec3[]( kRed, kYellow, kCyan, kBlue );
+      
+         uint PatternX = uint(ModInteger(floor(InPixels.x), PatternSize));
+         OutputColour = Luminance * HDRColour * Mask[PatternX];
+         
+         break;
       }
-   else /* if(x < 3.0) */
+      case 3:  /* 5 BRG pattern - 576TVL (16:9) horiz resolution on a 4K screen */
       {
-      float blue = Ramp(gaussian, (sdr_colour.z * kGuassianMax) + kGuassianMin);
+         const uint PatternSize = 5;         
-      FragColor = vec4(0.0, 0.0, blue * hdr_colour.z, 1.0);
+         const vec3 Mask[5] = vec3[]( kRed, kMagenta, kBlue, kGreen, kGreen );
+      
+         uint PatternX = uint(ModInteger(floor(InPixels.x), PatternSize));
+         OutputColour = Luminance * HDRColour * Mask[PatternX];
+         
+         break;
       }
-#endif /* 0 */
+      case 4:  /* 5 pattern - 576TVL (16:9) horiz resolution on a 4K screen */
+      {
+         const uint PatternSize = 5;         
+         const vec3 Mask[5] = vec3[]( kRed, kYellow, kGreen, kCyan, kBlue );
+      
+         uint PatternX = uint(ModInteger(floor(InPixels.x), PatternSize));
+         OutputColour = Luminance * HDRColour * Mask[PatternX];
+         
+         break;
+      }
+      case 5:  /* 6 pattern - 480TVL (16:9) horiz resolution on a 4K screen */
+      {
+         const uint PatternSize = 6;
+         const vec3 Mask[6] = vec3[]( kRed, kRed, kGreen, kGreen, kBlue, kBlue );
+      
+         uint PatternX = uint(ModInteger(floor(InPixels.x), PatternSize));
+         OutputColour = Luminance * HDRColour * Mask[PatternX];
+         
+         break;
+      }
+      case 6:  /* 7 pattern - 410TVL (16:9) horiz resolution on a 4K screen */
+      {
+         const uint PatternSize = 7;
+         const vec3 Mask[7] = vec3[]( kRed, kRed, kYellow, kGreen, kCyan, kBlue, kBlue );
+      
+         uint PatternX = uint(ModInteger(floor(InPixels.x), PatternSize));
+         OutputColour = Luminance * HDRColour * Mask[PatternX];
+         
+         break;
+      }
+      case 7:  /* 9 pattern - 640TVL (16:9) horiz resolution on a *8K* screen */
+      {
+         const uint PatternSize = 9;
+         const vec3 Mask[9] = vec3[]( kBlack, kRed, kRed, kBlack, kGreen, kGreen, kBlack, kBlue, kBlue );
+      
+         uint PatternX = uint(ModInteger(floor(InPixels.x), PatternSize));
+         OutputColour = Luminance * HDRColour * Mask[PatternX];
+         
+         break;
+      }
+      case 8:  /* 12 pattern - 480TVL (16:9) horiz resolution on a *8K* screen */
+      {
+         const uint PatternSize = 12;
+         const vec3 Mask[12] = vec3[]( kBlack, kRed, kRed, kRed, kBlack, kGreen, kGreen, kGreen, kBlack, kBlue, kBlue, kBlue );
+      
+         uint PatternX = uint(ModInteger(floor(InPixels.x), PatternSize));
+         OutputColour = Luminance * HDRColour * Mask[PatternX];
+         
+         break;
+      }
+      default:
+      {
+         OutputColour = vec3(0.0);
+         
+         break;
+      }
+   }
+
+   FragColor = vec4(OutputColour, 1.0);
 }