SMAASearchTex.h File Reference

SMAA Search Texture generator. More...

#include <cmath>
#include <cstring>

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Namespaces
namespace	smaa_search_detail

Functions
unsigned char	smaa_search_detail::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.
void	generateSearchTex (unsigned char *out)
	Generate the SMAA search texture into a caller-provided buffer.

Variables
static constexpr int	SMAA_SEARCHTEX_WIDTH = 66
static constexpr int	SMAA_SEARCHTEX_HEIGHT = 33
static constexpr int	SMAA_SEARCHTEX_PITCH = SMAA_SEARCHTEX_WIDTH
static constexpr int	SMAA_SEARCHTEX_PACKED_WIDTH = 64
	Packed texture dimensions used during bilinear sampling.
static constexpr int	SMAA_SEARCHTEX_PACKED_HEIGHT = 16

Detailed Description

SMAA Search Texture generator.

Generates the 66x33 R8 UNORM search lookup texture used by the SMAA blending weight calculation pass.

Based on the SMAA reference implementation by Jorge Jimenez et al. (MIT License).

The search texture is used for bilinear-filtering acceleration of edge endpoint detection. Each texel encodes whether a particular bilinear combination of two horizontally/vertically adjacent edge pixels indicates "continue searching" or "endpoint found".

The key insight is that bilinear filtering of two edge pixels yields a specific set of values depending on the (left, right) or (top, bottom) edge configuration. The search texture maps each bilinear result to a sub-pixel-accurate endpoint position.

Total size: 66 x 33 pixels, R8 format (2178 bytes).

Function Documentation

generateSearchTex()

void generateSearchTex ( unsigned char * out )

inline

Generate the SMAA search texture into a caller-provided buffer.

Parameters

out	must point to at least SMAA_SEARCHTEX_WIDTH * SMAA_SEARCHTEX_HEIGHT bytes.

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Variable Documentation

SMAA_SEARCHTEX_HEIGHT

int SMAA_SEARCHTEX_HEIGHT = 33

staticconstexpr

SMAA_SEARCHTEX_PACKED_HEIGHT

int SMAA_SEARCHTEX_PACKED_HEIGHT = 16

staticconstexpr

SMAA_SEARCHTEX_PACKED_WIDTH

int SMAA_SEARCHTEX_PACKED_WIDTH = 64

staticconstexpr

Packed texture dimensions used during bilinear sampling.

SMAA_SEARCHTEX_PITCH

int SMAA_SEARCHTEX_PITCH = SMAA_SEARCHTEX_WIDTH

staticconstexpr

SMAA_SEARCHTEX_WIDTH

int SMAA_SEARCHTEX_WIDTH = 66

staticconstexpr