Edge

touchgfx/TextureMapTypes.hpp

An edge contains information about one edge, between two points, of a triangle, as well as information about how to interpolate values when moving in the vertical direction.

Public Functions

	Edge(const Gradients & gradients, const Point3D * vertices, int top, int bottom)
	Initializes a new instance of the TextureMapTypes class.
FORCE_INLINE_FUNCTION int	step()
	Perform a step along the edge.
FORCE_INLINE_FUNCTION int	step(int steps)
	Performs a number of steps along the edge.

Public Attributes

int32_t	denominator
	The denominator.
int32_t	errorTerm
	The error term.
int	height
	The height.
int32_t	numerator
	The numerator.
float	oneOverZ
	The one over z coordinate.
float	oneOverZStep
	The one over z coordinate step.
float	oneOverZStepExtra
	The one over z coordinate step extra.
float	UOverZ
	The over z coordinate.
float	UOverZStep
	The over z coordinate step.
float	UOverZStepExtra
	The over z coordinate step extra.
float	VOverZ
	The over z coordinate.
float	VOverZStep
	The over z coordinate step.
float	VOverZStepExtra
	The over z coordinate step extra.
int32_t	X
	The X coordinate.
int32_t	XStep
	Amount to increment x.
int	Y
	The Y coordinate.

Public Functions Documentation

Edge

Edge	(	const Gradients &	gradients ,
		const Point3D *	vertices ,
		int	top ,
		int	bottom
		)

Initializes a new instance of the TextureMapTypes class.

Construct the edge between two vertices and uses the gradients for calculating the interpolation values.

Parameters:

gradients	The gradients for the triangle.
vertices	The vertices for the triangle.
top	The index in the vertices array of the top vertex of this edge.
bottom	The index in the vertices array of the bottom vertex of this edge.

step

FORCE_INLINE_FUNCTION int step	(			)

Perform a step along the edge.

Increase the Y and decrease the height.

Returns:

The remaining height.

step

FORCE_INLINE_FUNCTION int step	(	int	steps	)

Performs a number of steps along the edge.

Parameters:

steps	The number of steps the perform.

Returns:

The remaining height.

Public Attributes Documentation

denominator

int32_t denominator

The denominator.

errorTerm

int32_t errorTerm

The error term.

height

int height

The height.

numerator

int32_t numerator

The numerator.

oneOverZ

float oneOverZ

The one over z coordinate.

oneOverZStep

float oneOverZStep

The one over z coordinate step.

oneOverZStepExtra

float oneOverZStepExtra

The one over z coordinate step extra.

UOverZ

float UOverZ

The over z coordinate.

UOverZStep

float UOverZStep

The over z coordinate step.

UOverZStepExtra

float UOverZStepExtra

The over z coordinate step extra.

VOverZ

float VOverZ

The over z coordinate.

VOverZStep

float VOverZStep

The over z coordinate step.

VOverZStepExtra

float VOverZStepExtra

The over z coordinate step extra.

X

int32_t X

The X coordinate.

XStep

int32_t XStep

Amount to increment x.

Y

int Y

The Y coordinate.