[TPHD] Add bicubic (sharpen) filter

Add  : bicubic (sharpen) filter.  @NAVras-Z Thnx
Fix : LOD description makes sense for regular users.

Enhancements/TwilightPrincessHD_Bicubic/output.glsl

@@ -0,0 +1,97 @@
+// https://github.com/obsproject/obs-studio/blob/master/libobs/data/bicubic_scale.effect // added customizable polynomials back
+
+#version 420
+
+in vec2 passUV;
+layout(binding=0) uniform sampler2D textureSrc;
+uniform vec2 textureSrcResolution;
+layout(location = 0) out vec4 colorOut0;
+
+float weight(float x)
+{
+	float ax = abs(x);
+
+	const float B = $b;
+	const float C = $c;
+
+	if (ax < 2.0) {
+		float x_squared = x * x;
+		if (ax < 1.0) {
+			return (x_squared *
+			((12.0 - 9.0 * B - 6.0 * C) * ax +
+				(-18.0 + 12.0 * B + 6.0 * C)) +
+				(6.0 - 2.0 * B))
+			/ 6.0;
+		}
+
+		return (x_squared *
+			((-B - 6.0 * C) * ax + (6.0 * B + 30.0 * C)) +
+				(-12.0 * B - 48.0 * C) * ax +
+				(8.0 * B + 24.0 * C))
+			/ 6.0;
+	}
+
+	return 0.0;
+}
+
+vec4 weight4(float x)
+{
+	return vec4(
+		weight(x - 2.0),
+		weight(x - 1.0),
+		weight(x),
+		weight(x + 1.0));
+}
+
+vec4 DrawBicubic(vec2 f_in)
+{
+	vec2 stepxy = 1.0/textureSrcResolution;
+	vec2 pos = f_in.st + stepxy * 0.5;
+	vec2 f = fract(pos * textureSrcResolution);
+
+	vec4 rowtaps = weight4(1.0 - f.x);
+	vec4 coltaps = weight4(1.0 - f.y);
+
+	vec2 uv0 = (-1.5 - f) * stepxy + pos;
+	vec2 uv1 = uv0 + stepxy;
+	vec2 uv2 = uv1 + stepxy;
+	vec2 uv3 = uv2 + stepxy;
+
+	float u_weight_sum = rowtaps.y + rowtaps.z;
+	float u_middle_offset = rowtaps.z * stepxy.x / u_weight_sum;
+	float u_middle = uv1.x + u_middle_offset;
+
+	float v_weight_sum = coltaps.y + coltaps.z;
+	float v_middle_offset = coltaps.z * stepxy.y / v_weight_sum;
+	float v_middle = uv1.y + v_middle_offset;
+
+	// wrap doesn't apply to texelFetch
+	// clamp
+//	ivec2 coord_top_left = ivec2(max(uv0 * textureSrcResolution, 0.5));
+//	ivec2 coord_bottom_right = ivec2(min(uv3 * textureSrcResolution, textureSrcResolution - 0.5));
+	// mirror
+	ivec2 coord_top_left = ivec2(abs(uv0 * textureSrcResolution));
+	ivec2 coord_bottom_right = ivec2(textureSrcResolution - abs(uv3 * textureSrcResolution - textureSrcResolution));
+
+	vec4 top = texelFetch(textureSrc, ivec2(coord_top_left), 0) * rowtaps.x;
+	top += texture(textureSrc, vec2(u_middle, uv0.y)) * u_weight_sum;
+	top += texelFetch(textureSrc, ivec2(coord_bottom_right.x, coord_top_left.y), 0) * rowtaps.w;
+	vec4 total = top * coltaps.x;
+
+	vec4 middle = texture(textureSrc, vec2(uv0.x, v_middle)) * rowtaps.x;
+	middle += texture(textureSrc, vec2(u_middle, v_middle)) * u_weight_sum;
+	middle += texture(textureSrc, vec2(uv3.x, v_middle)) * rowtaps.w;
+	total += middle * v_weight_sum;
+
+	vec4 bottom = texelFetch(textureSrc, ivec2(coord_top_left.x, coord_bottom_right.y), 0) * rowtaps.x;
+	bottom += texture(textureSrc, vec2(u_middle, uv3.y)) * u_weight_sum;
+	bottom += texelFetch(textureSrc, ivec2(coord_bottom_right), 0) * rowtaps.w;
+	total += bottom * coltaps.w;
+
+	return total;
+}
+
+void main()
+{
+	colorOut0 = vec4(DrawBicubic(passUV).rgb,1.0);
+}

Enhancements/TwilightPrincessHD_Bicubic/rules.txt

@@ -0,0 +1,39 @@
+[Definition]
+name = Optimized Bicubic spline resampler
+titleIds = titleIds = 000500001019C800,000500001019E600,000500001019E500
+path = "The Legend of Zelda: Twilight Princess HD/Sharpen Filters/Bicubic"
+description = The b and c can adjust the properties of the cubic; sometimes referred to as "blurring" and "ringing" respectively.
+version = 3
+
+[OutputShader]
+upscaleMagFilter = Linear
+downscaleMagFilter = Linear
+
+[Preset]
+name = Catmull-Rom
+$b = 0.0
+$c = 0.5
+
+[Preset]
+name = Mitchell-Netravali
+$b = 1/3
+$c = 1/3
+
+[Preset]
+name = B-spline
+$b = 1.0
+$c = 0.0
+
+[Preset]
+name = Photoshop
+$b = 0.0
+$c = 0.75
+
+[Preset]
+name = Oversharp, w ringing artifact
+$b = 0.1
+$c = 0.9
+
+# Generally b,c >= 0. the shader can't produce negative weight at 0-1 because of bilinear optimization
+# But some combinations of negative b,c might have non-negative weight
+# Optionally [b + 2c = 1] for numerically accurate filter

Enhancements/TwilightPrincessHD_NegativeLOD/rules.txt

@@ -1,8 +1,7 @@
 [Definition]
 titleIds = 000500001019C800,000500001019E600,000500001019E500
-name = Resolution
+name = Level of detail
 path = "The Legend of Zelda: Twilight Princess HD/Enhancements/Negative Texture LOD"
-description = Changes the resolution of the game.
 version = 3
 
 [Preset]
@@ -36,6 +35,14 @@ $0x034 = -4
 $0x035 = -4
 $0x01a = -4
 
+[Preset]
+name = LOD +2 (Simulate WiiU LOD on higher resolution)
+$0x031 = +2
+$0x033 = +2
+$0x034 = +2
+$0x035 = +2
+$0x01a = 0
+
 [TextureRedefine]
 formats = 0x031 #0x431,0x432,0x433,0x434,0x435 not used. 
 overwriteRelativeLodBias = $0x031