SMAAAreaTex.h File Reference

SMAA Area Texture generator. More...

#include <cmath>
#include <cstring>

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Namespaces
namespace	smaa_detail

Functions
float	smaa_detail::areaOrtho (float p, float d, float offset)
	Smoothing function used by the area calculation.
void	smaa_detail::calcAreaOrtho (int d1, int d2, int e1, int e2, float offset, float &r, float &g)
	Compute the area for a specific orthogonal edge configuration.
float	smaa_detail::subtexOffset (int idx)
	Map sub-pixel index [0..6] to sub-pixel offset value.
void	generateAreaTex (unsigned char *out)
	Generate the SMAA area texture into a caller-provided buffer.

Variables
static constexpr int	SMAA_AREATEX_WIDTH = 160
static constexpr int	SMAA_AREATEX_HEIGHT = 560
static constexpr int	SMAA_AREATEX_PITCH = SMAA_AREATEX_WIDTH * 2
static constexpr int	SMAA_AREATEX_MAX_DISTANCE = 16
	Number of orthogonal edge patterns (5x4 = 20 actually, but the original implementation uses a 5x5 grid = 25 pattern slots, 20 meaningful).
static constexpr int	SMAA_AREATEX_SUBTEX_COUNT = 7
static constexpr int	SMAA_AREATEX_ORTHO_PATTERNS = 16
static constexpr int	SMAA_AREATEX_SUBTEX_SIZE = (SMAA_AREATEX_MAX_DISTANCE + 1)

Detailed Description

SMAA Area Texture generator.

Generates the 160x560 RG8 UNORM area lookup texture used by the SMAA blending weight calculation pass.

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

The area texture encodes the blending areas for all possible edge patterns at all distances. It is organised as a grid of sub-textures:

• Each sub-texture is (SMAA_AREATEX_MAX_DISTANCE+1) x (SMAA_AREATEX_MAX_DISTANCE+1) = 17x17 pixels
• There are 20 crossing-edge patterns (ortho + diag) arranged horizontally, and 7 sub-pixel offsets arranged vertically.

Total size: 160 x 560 pixels, RG8 format (2 bytes/pixel = 179200 bytes).

Function Documentation

generateAreaTex()

void generateAreaTex ( unsigned char * out )

inline

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

Parameters

out	must point to at least SMAA_AREATEX_WIDTH * SMAA_AREATEX_HEIGHT * 2 bytes.

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Variable Documentation

SMAA_AREATEX_HEIGHT

int SMAA_AREATEX_HEIGHT = 560

staticconstexpr

SMAA_AREATEX_MAX_DISTANCE

int SMAA_AREATEX_MAX_DISTANCE = 16

staticconstexpr

Number of orthogonal edge patterns (5x4 = 20 actually, but the original implementation uses a 5x5 grid = 25 pattern slots, 20 meaningful).

SMAA_AREATEX_ORTHO_PATTERNS

int SMAA_AREATEX_ORTHO_PATTERNS = 16

staticconstexpr

SMAA_AREATEX_PITCH

int SMAA_AREATEX_PITCH = SMAA_AREATEX_WIDTH * 2

staticconstexpr

SMAA_AREATEX_SUBTEX_COUNT

int SMAA_AREATEX_SUBTEX_COUNT = 7

staticconstexpr

SMAA_AREATEX_SUBTEX_SIZE

int SMAA_AREATEX_SUBTEX_SIZE = (SMAA_AREATEX_MAX_DISTANCE + 1)

staticconstexpr

SMAA_AREATEX_WIDTH

int SMAA_AREATEX_WIDTH = 160

staticconstexpr