noise.h File Reference

Perlin noise routines for procedural textures, etc. More...

#include "llmath.h"

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Defines

#define B   0x100

#define BM   0xff

#define N   0x1000

#define NF32   (4096.f)

#define NP   12

#define NM   0xfff

#define s_curve(t)   ( t * t * (3.f - 2.f * t) )

#define lerp_m(t, a, b)   ( a + t * (b - a) )

#define setup_noise(i, b0, b1, r0, r1)

Functions

F32 turbulence2 (F32 *v, F32 freq)

F32 turbulence3 (float *v, float freq)

F32 clouds3 (float *v, float freq)

F32 noise2 (float *vec)

F32 noise3 (float *vec)

F32 bias (F32 a, F32 b)

F32 gain (F32 a, F32 b)

static void init (void)

void fast_setup (F32 vec, U8 &b0, U8 &b1, F32 &r0, F32 &r1)

F32 noise1 (const F32 arg)

F32 fast_at2 (F32 rx, F32 ry, F32 *q)

F32 fast_at3 (F32 rx, F32 ry, F32 rz, F32 *q)

static void normalize2 (F32 v[2])

static void normalize3 (F32 v[3])

Variables

S32 p [B+B+2]

F32 g3 [B+B+2][3]

F32 g2 [B+B+2][2]

F32 g1 [B+B+2]

S32 gNoiseStart

Detailed Description

Perlin noise routines for procedural textures, etc.

LicenseInfo: firstyear=2000&license=viewergpl

Second Life Viewer Source Code The source code in this file ("Source Code") is provided by Linden Lab to you under the terms of the GNU General Public License, version 2.0 ("GPL"), unless you have obtained a separate licensing agreement ("Other License"), formally executed by you and Linden Lab. Terms of the GPL can be found in doc/GPL-license.txt in this distribution, or online at http://secondlifegrid.net/programs/open_source/licensing/gplv2

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Definition in file noise.h.

Define Documentation

#define B 0x100

Definition at line 108 of file noise.h.

#define BM 0xff

Definition at line 109 of file noise.h.

#define lerp_m	(	t,
		a,
		b	)	( a + t * (b - a) )

Definition at line 126 of file noise.h.

#define N 0x1000

Definition at line 111 of file noise.h.

#define NF32 (4096.f)

Definition at line 112 of file noise.h.

#define NM 0xfff

Definition at line 114 of file noise.h.

#define NP 12

Definition at line 113 of file noise.h.

#define s_curve ( t ) ( t * t * (3.f - 2.f * t) )

Definition at line 124 of file noise.h.

#define setup_noise	(	i,
		b0,
		b1,
		r0,
		r1	)

Value:

t = vec[i] + N;\
        b0 = (lltrunc(t)) & BM;\
        b1 = (b0+1) & BM;\
        r0 = t - lltrunc(t);\
        r1 = r0 - 1.f;

Definition at line 128 of file noise.h.

Referenced by noise1().

Function Documentation

F32 bias	(	F32	a,
		F32	b
	)			`[inline]`

Definition at line 43 of file noise.h.

References indra::base::lllog::log().

Referenced by LLAgent::calcFocusOffset(), LLStringBase< T >::compareDict(), LLImageTGA::decodeAndProcess(), and LLFace::renderSelectedUV().

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F32 clouds3	(	float *	v,
		float	freq
	)			`[inline]`

Definition at line 90 of file noise.h.

References noise3().

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F32 fast_at2	(	F32	rx,
		F32	ry,
		F32 *	q
	)			`[inline]`

Definition at line 169 of file noise.h.

F32 fast_at3	(	F32	rx,
		F32	ry,
		F32	rz,
		F32 *	q
	)			`[inline]`

Definition at line 176 of file noise.h.

void fast_setup	(	F32	vec,
		U8 &	b0,
		U8 &	b1,
		F32 &	r0,
		F32 &	r1
	)			`[inline]`

Definition at line 136 of file noise.h.

References lltrunc(), NF32, and S32.

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F32 gain	(	F32	a,
		F32	b
	)			`[inline]`

Definition at line 48 of file noise.h.

References indra::base::lllog::log(), and p.

Referenced by LLAudioEngine::mapWindVecToGain(), process_attached_sound(), process_attached_sound_gain_change(), process_sound_trigger(), LLViewerObject::processUpdateMessage(), and LLVOAvatar::updateCharacter().

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static void init ( void ) [static]

Definition at line 316 of file noise.h.

References B, g1, g2, g3, i, j, normalize2(), normalize3(), and p.

Referenced by tut::LLTemplateMessageBuilderTestData::defaultTemplate(), LLUUID::getCurrentTime(), idle_startup(), tut::LLMessageSystemTestData::LLMessageSystemTestData(), LLVFSFileBlock::LLVFSFileBlock(), noise1(), noise2(), and noise3().

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F32 noise1 ( const F32 arg ) [inline]

Definition at line 148 of file noise.h.

References g1, gNoiseStart, init(), lerp_m, p, s_curve, and setup_noise.

Referenced by LLVOAvatar::idleUpdate(), and LLDrawPoolAvatar::renderAvatars().

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F32 noise2 ( float * vec )

Definition at line 47 of file noise.cpp.

References fast_at2(), fast_setup(), g2, gNoiseStart, i, init(), j, lerp_m, p, S32, and s_curve.

Referenced by LLSurfacePatch::eval(), LLVLComposition::generateHeights(), LLBodyNoiseMotion::onUpdate(), and turbulence2().

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F32 noise3 ( float * vec ) [inline]

Definition at line 183 of file noise.h.

References d, fast_at3(), fast_setup(), g3, gNoiseStart, i, init(), j, lerp_m, p, S32, and s_curve.

Referenced by clouds3(), and turbulence3().

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static void normalize2 ( F32 v[2] ) [static]

Definition at line 297 of file noise.h.

static void normalize3 ( F32 v[3] ) [static]

Definition at line 306 of file noise.h.

F32 turbulence2	(	F32 *	v,
		F32	freq
	)			`[inline]`

Definition at line 62 of file noise.h.

References noise2().

Referenced by LLVLComposition::generateHeights().

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F32 turbulence3	(	float *	v,
		float	freq
	)			`[inline]`

Definition at line 74 of file noise.h.

References noise3().

Referenced by LLVOTree::updateGeometry().

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Variable Documentation

F32 g1[B+B+2]

Definition at line 43 of file noise.cpp.

F32 g2[B+B+2][2]

Definition at line 42 of file noise.cpp.

F32 g3[B+B+2][3]

Definition at line 41 of file noise.cpp.

S32 gNoiseStart

Definition at line 44 of file noise.cpp.

Referenced by noise1(), noise2(), and noise3().

S32 p[B+B+2]

Definition at line 40 of file noise.cpp.


Defines
#define	B 0x100
#define	BM 0xff
#define	N 0x1000
#define	NF32 (4096.f)
#define	NP 12
#define	NM 0xfff
#define	s_curve(t) ( t * t * (3.f - 2.f * t) )
#define	lerp_m(t, a, b) ( a + t * (b - a) )
#define	setup_noise(i, b0, b1, r0, r1)
Functions
F32	turbulence2 (F32 *v, F32 freq)
F32	turbulence3 (float *v, float freq)
F32	clouds3 (float *v, float freq)
F32	noise2 (float *vec)
F32	noise3 (float *vec)
F32	bias (F32 a, F32 b)
F32	gain (F32 a, F32 b)
static void	init (void)
void	fast_setup (F32 vec, U8 &b0, U8 &b1, F32 &r0, F32 &r1)
F32	noise1 (const F32 arg)
F32	fast_at2 (F32 rx, F32 ry, F32 *q)
F32	fast_at3 (F32 rx, F32 ry, F32 rz, F32 *q)
static void	normalize2 (F32 v[2])
static void	normalize3 (F32 v[3])
Variables
S32	p [B+B+2]
F32	g3 [B+B+2][3]
F32	g2 [B+B+2][2]
F32	g1 [B+B+2]
S32	gNoiseStart