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src/ext/shader/crt-lottes.frag

@@ -1,16 +1,14 @@
 CODE(
 
 precision highp float;
-precision mediump int;
 
-uniform sampler2D tex;
+varying vec2 texCoord;
+uniform sampler2D source;
 uniform float trg_w;
 uniform float trg_h;
 
-
 // Emulated input resolution.
 vec2 res=vec2(256.0,144.0);
-
 vec2 trg=vec2(trg_w, trg_h);
 
 // Hardness of scanline.
@@ -47,84 +45,83 @@ vec3 ToSrgb(vec3 c){return vec3(ToSrgb1(c.r),ToSrgb1(c.g),ToSrgb1(c.b));}
 // Nearest emulated sample given floating point position and texel offset.
 // Also zero's off screen.
 vec3 Fetch(vec2 pos,vec2 off){
-	pos=(floor(pos*res+off)+vec2(0.5,0.5))/res;
-	return ToLinear(1.2 * texture2D(tex,pos.xy,-16.0).rgb);}
+  pos=(floor(pos*res+off)+vec2(0.5,0.5))/res;
+  return ToLinear(1.2 * texture2D(source,pos.xy,-16.0).rgb);}
 
 // Distance in emulated pixels to nearest texel.
 vec2 Dist(vec2 pos){pos=pos*res;return -((pos-floor(pos))-vec2(0.5));}
-		
+    
 // 1D Gaussian.
 float Gaus(float pos,float scale){return exp2(scale*pos*pos);}
 
 // 3-tap Gaussian filter along horz line.
 vec3 Horz3(vec2 pos,float off){
-	vec3 b=Fetch(pos,vec2(-1.0,off));
-	vec3 c=Fetch(pos,vec2( 0.0,off));
-	vec3 d=Fetch(pos,vec2( 1.0,off));
-	float dst=Dist(pos).x;
-	// Convert distance to weight.
-	float scale=hardPix;
-	float wb=Gaus(dst-1.0,scale);
-	float wc=Gaus(dst+0.0,scale);
-	float wd=Gaus(dst+1.0,scale);
-	// Return filtered sample.
-	return (b*wb+c*wc+d*wd)/(wb+wc+wd);}
+  vec3 b=Fetch(pos,vec2(-1.0,off));
+  vec3 c=Fetch(pos,vec2( 0.0,off));
+  vec3 d=Fetch(pos,vec2( 1.0,off));
+  float dst=Dist(pos).x;
+  // Convert distance to weight.
+  float scale=hardPix;
+  float wb=Gaus(dst-1.0,scale);
+  float wc=Gaus(dst+0.0,scale);
+  float wd=Gaus(dst+1.0,scale);
+  // Return filtered sample.
+  return (b*wb+c*wc+d*wd)/(wb+wc+wd);}
 
 // 5-tap Gaussian filter along horz line.
 vec3 Horz5(vec2 pos,float off){
-	vec3 a=Fetch(pos,vec2(-2.0,off));
-	vec3 b=Fetch(pos,vec2(-1.0,off));
-	vec3 c=Fetch(pos,vec2( 0.0,off));
-	vec3 d=Fetch(pos,vec2( 1.0,off));
-	vec3 e=Fetch(pos,vec2( 2.0,off));
-	float dst=Dist(pos).x;
-	// Convert distance to weight.
-	float scale=hardPix;
-	float wa=Gaus(dst-2.0,scale);
-	float wb=Gaus(dst-1.0,scale);
-	float wc=Gaus(dst+0.0,scale);
-	float wd=Gaus(dst+1.0,scale);
-	float we=Gaus(dst+2.0,scale);
-	// Return filtered sample.
-	return (a*wa+b*wb+c*wc+d*wd+e*we)/(wa+wb+wc+wd+we);}
+  vec3 a=Fetch(pos,vec2(-2.0,off));
+  vec3 b=Fetch(pos,vec2(-1.0,off));
+  vec3 c=Fetch(pos,vec2( 0.0,off));
+  vec3 d=Fetch(pos,vec2( 1.0,off));
+  vec3 e=Fetch(pos,vec2( 2.0,off));
+  float dst=Dist(pos).x;
+  // Convert distance to weight.
+  float scale=hardPix;
+  float wa=Gaus(dst-2.0,scale);
+  float wb=Gaus(dst-1.0,scale);
+  float wc=Gaus(dst+0.0,scale);
+  float wd=Gaus(dst+1.0,scale);
+  float we=Gaus(dst+2.0,scale);
+  // Return filtered sample.
+  return (a*wa+b*wb+c*wc+d*wd+e*we)/(wa+wb+wc+wd+we);}
 
 // Return scanline weight.
 float Scan(vec2 pos,float off){
-	float dst=Dist(pos).y;
-	return Gaus(dst+off,hardScan);}
+  float dst=Dist(pos).y;
+  return Gaus(dst+off,hardScan);}
 
 // Allow nearest three lines to effect pixel.
 vec3 Tri(vec2 pos){
-	vec3 a=Horz3(pos,-1.0);
-	vec3 b=Horz5(pos, 0.0);
-	vec3 c=Horz3(pos, 1.0);
-	float wa=Scan(pos,-1.0);
-	float wb=Scan(pos, 0.0);
-	float wc=Scan(pos, 1.0);
-	return a*wa+b*wb+c*wc;}
+  vec3 a=Horz3(pos,-1.0);
+  vec3 b=Horz5(pos, 0.0);
+  vec3 c=Horz3(pos, 1.0);
+  float wa=Scan(pos,-1.0);
+  float wb=Scan(pos, 0.0);
+  float wc=Scan(pos, 1.0);
+  return a*wa+b*wb+c*wc;}
 
 // Distortion of scanlines, and end of screen alpha.
 vec2 Warp(vec2 pos){
-	pos=pos*2.0-1.0;    
-	pos*=vec2(1.0+(pos.y*pos.y)*warp.x,1.0+(pos.x*pos.x)*warp.y);
-	return pos*0.5+0.5;}
+  pos=pos*2.0-1.0;    
+  pos*=vec2(1.0+(pos.y*pos.y)*warp.x,1.0+(pos.x*pos.x)*warp.y);
+  return pos*0.5+0.5;}
 
 // Shadow mask.
 vec3 Mask(vec2 pos){
-	pos.x+=pos.y*3.0;
-	vec3 mask=vec3(maskDark,maskDark,maskDark);
-	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;
-	return mask;}    
+  pos.x+=pos.y*3.0;
+  vec3 mask=vec3(maskDark,maskDark,maskDark);
+  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;
+  return mask;}    
 
-void main() 
-{
-	vec2 pos = gl_FragCoord.xy/trg.xy;
-	hardScan=-12.0;
-//	maskDark=maskLight;
-	pos=Warp(gl_FragCoord.xy/trg.xy);
-	gl_FragColor.rgb=Tri(vec2(pos.s, 1.0 - pos.t))*Mask(gl_FragCoord.xy);
-	gl_FragColor = vec4(ToSrgb(gl_FragColor.rgb), 1.0);
+void main() {
+    vec2 pos = gl_FragCoord.xy/trg.xy;
+    hardScan=-12.0;
+//      maskDark=maskLight;
+    pos=Warp(gl_FragCoord.xy/trg.xy);
+    gl_FragColor.rgb=Tri(vec2(pos.s, 1.0 - pos.t))*Mask(gl_FragCoord.xy);
+  gl_FragColor = vec4(ToSrgb(gl_FragColor.rgb), 1.0);
 })