smaa_search_detail Namespace Reference

Functions
unsigned char	calcSearchValue (int e1, int e2, float bias)
	Encode two edge values (e1, e2 in {0,1}) and their bilinear position into a search texture value.

Function Documentation

calcSearchValue()

unsigned char smaa_search_detail::calcSearchValue ( int e1, int e2, float bias )

inline

Encode two edge values (e1, e2 in {0,1}) and their bilinear position into a search texture value.

When the GPU bilinear-samples two adjacent edge texels, the result encodes both texels' values. The search texture pre-computes for every possible bilinear result:

• 0 (0.0): no edge found => stop searching
• 127 (0.5): partial match => keep searching
• 255 (1.0): exact match => endpoint found

The texture is indexed by: u = bilinear(e.g) * 0.5 (horizontal: edge green channel) v = e.r * 0.5 (perpendicular crossing edge)

For the left/up search direction, uvs are offset differently than for right/down. Compute the search texture value for a given edge configuration.

Parameters

e1	left/top edge pixel value (0 or 1)
e2	right/bottom edge pixel value (0 or 1)
bias	bilinear interpolation bias (0.0 to 1.0)

Returns

search result: 0=stop, 127=continue, 255=found

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