Traktor: Using Catmull-Rom filter to reduce blurriness of TAA in motion.

data/Source/System/World/Antialias/Shaders/Taa/Temporal.xdi

@@ -25,6 +25,43 @@ vec4 ColorClamp(in texture2D currentFrame, in sampler currentSampler, vec4 curre
 	return clamp(historyColor, bmn - E, bmx + E);
 }
 
+vec4 CatmullRomFilterSample(in texture2D tx, in sampler smp, vec2 uv)
+{
+	// return texture(sampler2D(tex, smp), uv);
+	
+#define TEX sampler2D(tx, smp)
+
+	vec2 texsiz = vec2(textureSize( TEX, 0 ).xy);
+	vec4 rtMetrics = vec4( 1.0 / texsiz.xy, texsiz.xy );
+
+	vec2 position = rtMetrics.zw * uv;
+	vec2 centerPosition = floor(position - 0.5) + 0.5;
+	vec2 f = position - centerPosition;
+	vec2 f2 = f * f;
+	vec2 f3 = f * f2;
+
+	const float c = 0.5; //note: [0;1] ( SMAA_FILMIC_REPROJECTION_SHARPNESS / 100.0 )
+	vec2 w0 =        -c  * f3 +  2.0 * c         * f2 - c * f;
+	vec2 w1 =  (2.0 - c) * f3 - (3.0 - c)        * f2         + 1.0;
+	vec2 w2 = -(2.0 - c) * f3 + (3.0 -  2.0 * c) * f2 + c * f;
+	vec2 w3 =         c  * f3 -                c * f2;
+
+	vec2 w12 = w1 + w2;
+	vec2 tc12 = rtMetrics.xy * (centerPosition + w2 / w12);
+	vec3 centerColor = textureLod(TEX, vec2(tc12.x, tc12.y), 0).rgb;
+
+	vec2 tc0 = rtMetrics.xy * (centerPosition - 1.0);
+	vec2 tc3 = rtMetrics.xy * (centerPosition + 2.0);
+	vec4 color =
+		vec4(textureLod(TEX, vec2(tc12.x, tc0.y ), 0).rgb, 1.0) * (w12.x * w0.y ) +
+		 vec4(textureLod(TEX, vec2(tc0.x,  tc12.y), 0).rgb, 1.0) * (w0.x  * w12.y) +
+		 vec4(centerColor,                                 1.0) * (w12.x * w12.y) +
+		 vec4(textureLod(TEX, vec2(tc3.x,  tc12.y), 0).rgb, 1.0) * (w3.x  * w12.y) +
+		 vec4(textureLod(TEX, vec2(tc12.x, tc3.y ), 0).rgb, 1.0) * (w12.x * w3.y );
+
+	return vec4( color.rgb / color.a, 1.0 );
+}
+
 vec4 TemporalAntiAlias(
 	in texture2D currentFrame,
 	in texture2D previousFrame,
@@ -54,7 +91,8 @@ vec4 TemporalAntiAlias(
 	if (!Clipped(uv - Vuv))
 	{
 		// Sample previous colour,
-		const vec4 cp = texture(sampler2D(previousFrame, linearSampler), uv - Vuv);
+		//const vec4 cp = texture(sampler2D(previousFrame, linearSampler), uv - Vuv);
+		const vec4 cp = CatmullRomFilterSample(previousFrame, linearSampler, uv - Vuv);
 
 		// Clamp previous colour to current color neighbourhood.
 		const vec4 ccp = ColorClamp(currentFrame, linearSampler, cc, cp, uv - Juv);