From bd4d99a0968f92d06beb6e07334b3b8b1232b5d2 Mon Sep 17 00:00:00 2001
From: hunterk <hunter_kaller@yahoo.com>
Date: Thu, 6 Oct 2016 09:21:19 -0500
Subject: [PATCH] add parameters to dotmask shader

---
 crt/shaders/dotmask.slang | 62 +++++++++++++++++++++++----------------
 1 file changed, 37 insertions(+), 25 deletions(-)

diff --git a/crt/shaders/dotmask.slang b/crt/shaders/dotmask.slang
index 48cbd7b..357eb2b 100644
--- a/crt/shaders/dotmask.slang
+++ b/crt/shaders/dotmask.slang
@@ -1,17 +1,29 @@
 #version 450
 
+/*
+   Dot Mask
+   Authors: cgwg, Timothy Lottes
+   License: GPL
+   
+   Note: This shader is just the dotmask functions from cgwg's CRT shader and crt-lottes.
+*/
+
 layout(std140, set = 0, binding = 0) uniform UBO
 {
    mat4 MVP;
    vec4 OutputSize;
    vec4 OriginalSize;
    vec4 SourceSize;
+   float DOTMASK_STRENGTH;
+   float maskDark;
+   float maskLight;
+   float shadowMask;
 } global;
 
-#define DOTMASK_STRENGTH 0.3
-#define maskDark 0.5
-#define maskLight 1.5
-#define shadowMask 0.0
+#pragma parameter DOTMASK_STRENGTH "CGWG Dot Mask Strength" 0.3 0.0 1.0 0.01
+#pragma parameter maskDark "Lottes maskDark" 0.5 0.0 2.0 0.1
+#pragma parameter maskLight "Lottes maskLight" 1.5 0.0 2.0 0.1
+#pragma parameter shadowMask "Mask Style" 3.0 0.0 4.0 1.0
 
 #define mod_factor vTexCoord.x * global.SourceSize.x * global.OutputSize.x / global.SourceSize.x
 
@@ -33,50 +45,50 @@ layout(set = 0, binding = 2) uniform sampler2D Source;
 
 // Shadow mask.
 vec3 Mask(vec2 pos){
-  vec3 mask=vec3(maskDark,maskDark,maskDark);
+  vec3 mask=vec3(global.maskDark,global.maskDark,global.maskDark);
   
 // Very compressed TV style shadow mask.
-  if (shadowMask == 1.0) {
-    float line=maskLight;
+  if (global.shadowMask == 1.0) {
+    float line=global.maskLight;
     float odd=0.0;
     if(fract(pos.x/6.0)<0.5)odd=1.0;
-    if(fract((pos.y+odd)/2.0)<0.5)line=maskDark;  
+    if(fract((pos.y+odd)/2.0)<0.5)line=global.maskDark;  
     pos.x=fract(pos.x/3.0);
    
-    if(pos.x<0.333)mask.r=maskLight;
-    else if(pos.x<0.666)mask.g=maskLight;
-    else mask.b=maskLight;
+    if(pos.x<0.333)mask.r=global.maskLight;
+    else if(pos.x<0.666)mask.g=global.maskLight;
+    else mask.b=global.maskLight;
     mask*=line;  
   } 
 
 // Aperture-grille.
-  else if (shadowMask == 2.0) {
+  else if (global.shadowMask == 2.0) {
     pos.x=fract(pos.x/3.0);
 
-    if(pos.x<0.333)mask.r=maskLight;
-    else if(pos.x<0.666)mask.g=maskLight;
-    else mask.b=maskLight;
+    if(pos.x<0.333)mask.r=global.maskLight;
+    else if(pos.x<0.666)mask.g=global.maskLight;
+    else mask.b=global.maskLight;
   } 
 
 // Stretched VGA style shadow mask (same as prior shaders).
-  else if (shadowMask == 3.0) {
+  else if (global.shadowMask == 3.0) {
     pos.x+=pos.y*3.0;
     pos.x=fract(pos.x/6.0);
 
-    if(pos.x<0.333)mask.r=maskLight;
-    else if(pos.x<0.666)mask.g=maskLight;
-    else mask.b=maskLight;
+    if(pos.x<0.333)mask.r=global.maskLight;
+    else if(pos.x<0.666)mask.g=global.maskLight;
+    else mask.b=global.maskLight;
   }
 
 // VGA style shadow mask.
-  else if (shadowMask == 4.0) {
+  else if (global.shadowMask == 4.0) {
     pos.xy=floor(pos.xy*vec2(1.0,0.5));
     pos.x+=pos.y*3.0;
     pos.x=fract(pos.x/6.0);
 
-    if(pos.x<0.333)mask.r=maskLight;
-    else if(pos.x<0.666)mask.g=maskLight;
-    else mask.b=maskLight;
+    if(pos.x<0.333)mask.r=global.maskLight;
+    else if(pos.x<0.666)mask.g=global.maskLight;
+    else mask.b=global.maskLight;
   }
 
   return mask;}
@@ -85,14 +97,14 @@ void main()
 {
 vec3 res = texture(Source, vTexCoord).rgb;
 
-float mask = 1.0 - DOTMASK_STRENGTH;
+float mask = 1.0 - global.DOTMASK_STRENGTH;
 
 //cgwg's dotmask emulation:
 //Output pixels are alternately tinted green and magenta
 vec3 dotMaskWeights = mix(vec3(1.0, mask, 1.0),
 						  vec3(mask, 1.0, mask),
 						  floor(mod(mod_factor, 2.0)));
-if (shadowMask == 0) {
+if (global.shadowMask == 0) {
 	res *= dotMaskWeights;
 	}
 else {