letterbox test

neercs/neercs.cpp

@@ -153,7 +153,7 @@ int main(int argc, char **argv)
 #endif
 
     new Neercs();
-    new DebugFps(5, 15);
+    new DebugFps(2, 2);
     app.ShowPointer(false);
 
     app.Run();

neercs/video/postfx.lolfx

@@ -40,6 +40,19 @@ float rand(in vec2 p)
 	return fract(sin(dot(p.xy,vec2(12.9898,78.233)))*43758.5453);
 	}
 
+float round_square(in vec2 p,in vec2 b,in float r)
+	{
+	return length(max(abs(p)-b,0.0))-r;
+	}
+
+vec3 letterbox(in vec2 p,in vec3 c)
+	{
+	vec2 b=screen_size*0.3625;
+	float r=screen_size.x*0.2;
+	float f=round_square(p,b,r);
+	return c*clamp(1.0-f,0.0,1.0);
+	}
+
 void main(void)
 	{
 	vec2 q=gl_TexCoord[0].xy;
@@ -77,7 +90,7 @@ void main(void)
 		{
 		color-=0.0125*mod(z.y*4.0+time*0.25,1.0);								// electron beam
 		color-=(vec3(rnd1,rnd1,rnd1)-vec3(rnd2,rnd2,rnd2))*0.1;					// noise
-		color*=0.75+0.25*sin(z.x*float(screen_size.x*2));							// scanline w
+		color*=0.75+0.25*sin(z.x*float(screen_size.x*2));						// scanline w
 		color*=0.90+0.10*cos(z.y*float(screen_size.y))*sin(0.5+z.x*float(screen_size.x));	// scanline h
 		}
 	else
@@ -86,5 +99,6 @@ void main(void)
 		}
 	color=vec3(color.x*0.875,color.y*1.0,color.z*0.625);
 	color*=q.x*(6.0-q.x*6.0)*q.y*(6.0-q.y*6.0);									// vignetting
+	color=letterbox(p,color);													// letterbox
 	gl_FragColor=vec4(color,1.0);
 	}