阴影优化

res/shader/hdr.fs

@@ -22,7 +22,16 @@ float CalculateShadow(){
 
 	float depthInShadowMap = texture2D(U_ShadowMap, fragPos.xy).r;
 	float currentDepth = fragPos.z;
-	float shadow = currentDepth > depthInShadowMap ? 1.0 : 0.0;
+
+	vec2 texelSize = 1.0/textureSize(U_ShadowMap, 0);
+	float shadow = 0;
+	for(int y = -1; y < 1; ++y){
+		for(int x = -1; x < 1; ++x){
+			float pcfDepth = texture2D(U_ShadowMap, fragPos.xy + texelSize * vec2(x,y)).r;
+			shadow += (currentDepth-0.05) > pcfDepth ? 1.0 : 0.0;
+		}
+	}
+	shadow/=9.0;
 	return shadow;
 }