/usr/local/google/home/srhines/android_trees/jb-mr2-dev/frameworks/rs/scriptc/rs_math.rsh File Reference

Functions
int	rsRand (int max_value)
int	rsRand (int min_value, int max_value)
float	rsRand (float max_value)
float	rsRand (float min_value, float max_value)
float	rsFrac (float)
uint	rsClamp (uint amount, uint low, uint high)
int	rsClamp (int amount, int low, int high)
ushort	rsClamp (ushort amount, ushort low, ushort high)
short	rsClamp (short amount, short low, short high)
uchar	rsClamp (uchar amount, uchar low, uchar high)
char	rsClamp (char amount, char low, char high)
static __inline__ void	rsExtractFrustumPlanes (const rs_matrix4x4 *viewProj, float4 *left, float4 *right, float4 *top, float4 *bottom, float4 *near, float4 *far)
static __inline__ bool	rsIsSphereInFrustum (float4 *sphere, float4 *left, float4 *right, float4 *top, float4 *bottom, float4 *near, float4 *far)
uchar4	rsPackColorTo8888 (float r, float g, float b)
uchar4	rsPackColorTo8888 (float r, float g, float b, float a)
uchar4	rsPackColorTo8888 (float3 color)
float4	rsUnpackColor8888 (uchar4 c)

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Detailed Description

todo-jsams

Definition in file rs_math.rsh.

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Function Documentation

uint rsClamp	(	uint	amount,
		uint	low,
		uint	high
	)

Clamp the value amount between low and high.

Parameters:

amount	The value to clamp
low
high

int rsClamp	(	int	amount,
		int	low,
		int	high
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

ushort rsClamp	(	ushort	amount,
		ushort	low,
		ushort	high
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

short rsClamp	(	short	amount,
		short	low,
		short	high
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

uchar rsClamp	(	uchar	amount,
		uchar	low,
		uchar	high
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

char rsClamp	(	char	amount,
		char	low,
		char	high
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

static __inline__ void rsExtractFrustumPlanes	(	const rs_matrix4x4 *	viewProj,
		float4 *	left,
		float4 *	right,
		float4 *	top,
		float4 *	bottom,
		float4 *	near,
		float4 *	far
	)		[static]

Computes 6 frustum planes from the view projection matrix

Parameters:

viewProj	matrix to extract planes from
left	plane
right	plane
top	plane
bottom	plane
near	plane
far	plane

Definition at line 102 of file rs_math.rsh.

float rsFrac

(

float

)

Returns the fractional part of a float

static __inline__ bool rsIsSphereInFrustum	(	float4 *	sphere,
		float4 *	left,
		float4 *	right,
		float4 *	top,
		float4 *	bottom,
		float4 *	near,
		float4 *	far
	)		[static]

Checks if a sphere is withing the 6 frustum planes

Parameters:

sphere	float4 representing the sphere
left	plane
right	plane
top	plane
bottom	plane
near	plane
far	plane

Definition at line 162 of file rs_math.rsh.

uchar4 rsPackColorTo8888	(	float	r,
		float	g,
		float	b
	)

Pack floating point (0-1) RGB values into a uchar4. The alpha component is set to 255 (1.0).

Parameters:

r
g
b

Returns:

uchar4

uchar4 rsPackColorTo8888	(	float	r,
		float	g,
		float	b,
		float	a
	)

Pack floating point (0-1) RGBA values into a uchar4.

Parameters:

r
g
b
a

Returns:

uchar4

uchar4 rsPackColorTo8888

(

float3

color

)

Pack floating point (0-1) RGB values into a uchar4. The alpha component is set to 255 (1.0).

Parameters:

color

Returns:

uchar4

Pack floating point (0-1) RGBA values into a uchar4.

Parameters:

color

Returns:

uchar4

int rsRand

(

int

max_value

)

Return a random value between 0 (or min_value) and max_malue.

int rsRand	(	int	min_value,
		int	max_value
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

float rsRand

(

float

max_value

)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

float rsRand	(	float	min_value,
		float	max_value
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

float4 rsUnpackColor8888

(

uchar4

c

)

Unpack a uchar4 color to float4. The resulting float range will be (0-1).

Parameters:

c

Returns:

float4