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/* $Id: macros.h,v 1.2 1996/09/15 01:49:44 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 2.0
* Copyright (C) 1995-1996 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* $Log: macros.h,v $
* Revision 1.2 1996/09/15 01:49:44 brianp
* added #define NULL 0
*
* Revision 1.1 1996/09/13 01:38:16 brianp
* Initial revision
*
*/
/*
* A collection of useful macros.
*/
#ifndef MACROS_H
#define MACROS_H
#include <math.h>
/* Limits: */
#define MAX_GLUSHORT 0xffff
#define MAX_GLUINT 0xffffffff
/* Copy short vectors: */
#define COPY_3V( DST, SRC ) DST[0] = SRC[0]; \
DST[1] = SRC[1]; \
DST[2] = SRC[2];
#define COPY_4V( DST, SRC ) DST[0] = SRC[0]; \
DST[1] = SRC[1]; \
DST[2] = SRC[2]; \
DST[3] = SRC[3];
/* Assign scalers to short vectors: */
#define ASSIGN_3V( V, V0, V1, V2 ) V[0] = V0; V[1] = V1; V[2] = V2;
#define ASSIGN_4V( V, V0, V1, V2, V3 ) V[0] = V0; \
V[1] = V1; \
V[2] = V2; \
V[3] = V3;
/* Test if we're inside a glBegin / glEnd pair: */
#define INSIDE_BEGIN_END(CTX) ((CTX)->Primitive!=GL_BITMAP)
/* Absolute value (for Int, Float, Double): */
#define ABSI(X) ((X) < 0 ? -(X) : (X))
#define ABSF(X) ((X) < 0.0F ? -(X) : (X))
#define ABSD(X) ((X) < 0.0 ? -(X) : (X))
/* Round a floating-point value to the nearest integer: */
#define ROUNDF(X) ( (X)<0.0F ? ((GLint) ((X)-0.5F)) : ((GLint) ((X)+0.5F)) )
/* Compute ceiling of integer quotient of A divided by B: */
#define CEILING( A, B ) ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
/* Clamp X to [MIN,MAX]: */
#define CLAMP( X, MIN, MAX ) ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
/* Min of two values: */
#define MIN2( A, B ) ( (A)<(B) ? (A) : (B) )
/* MAX of two values: */
#define MAX2( A, B ) ( (A)>(B) ? (A) : (B) )
/* Dot product of two 3-element vectors */
#define DOT3( a, b ) ( a[0]*b[0] + a[1]*b[1] + a[2]*b[2] )
/* Dot product of two 4-element vectors */
#define DOT4( a, b ) ( a[0]*b[0] + a[1]*b[1] + a[2]*b[2] + a[3]*b[3] )
/* Normalize a 3-element vector to unit length */
#define NORMALIZE_3V( a ) { GLfloat len; \
len = sqrt(a[0]*a[0]+a[1]*a[1]+a[2]*a[2]); \
if (len>0.0001) { \
GLfloat scale = 1.0F / len; \
a[0] *= scale; \
a[1] *= scale; \
a[2] *= scale; \
} \
}
/*
* Integer / float conversion for colors, normals, etc.
*/
/* Convert GLubyte in [0,255] to GLfloat in [0.0,1.0] */
#define UBYTE_TO_FLOAT(B) ((GLfloat) (B) * (1.0F / 255.0F))
/* Convert GLfloat in [0.0,1.0] to GLubyte in [0,255] */
#define FLOAT_TO_UBYTE(X) ((GLubyte) (GLint) (((X)) * 255.0F))
/* Convert GLbyte in [-128,127] to GLfloat in [-1.0,1.0] */
#define BYTE_TO_FLOAT(B) ((2.0F * (B) + 1.0F) * (1.0F/255.0F))
/* Convert GLfloat in [-1.0,1.0] to GLbyte in [-128,127] */
#define FLOAT_TO_BYTE(X) ( (((GLint) (255.0F * (X))) - 1) / 2 )
/* Convert GLushort in [0,65536] to GLfloat in [0.0,1.0] */
#define USHORT_TO_FLOAT(S) ((GLfloat) (S) * (1.0F / 65535.0F))
/* Convert GLfloat in [0.0,1.0] to GLushort in [0,65536] */
#define FLOAT_TO_USHORT(X) ((GLushort) (GLint) ((X) * 65535.0F))
/* Convert GLshort in [-32768,32767] to GLfloat in [-1.0,1.0] */
#define SHORT_TO_FLOAT(S) ((2.0F * (S) + 1.0F) * (1.0F/65535.0F))
/* Convert GLfloat in [0.0,1.0] to GLshort in [-32768,32767] */
#define FLOAT_TO_SHORT(X) ( (((GLint) (65535.0F * (X))) - 1) / 2 )
/* Convert GLuint in [0,4294967295] to GLfloat in [0.0,1.0] */
#define UINT_TO_FLOAT(U) ((GLfloat) (U) * (1.0F / 4294967295.0F))
/* Convert GLfloat in [0.0,1.0] to GLuint in [0,4294967295] */
#define FLOAT_TO_UINT(X) ((GLuint) (GLint) ((X) * 4294967295.0))
/* Convert GLint in [-2147483648,2147483647] to GLfloat in [-1.0,1.0] */
#define INT_TO_FLOAT(I) ((2.0F * (I) + 1.0F) * (1.0F/4294967294.0F))
/* Convert GLfloat in [-1.0,1.0] to GLint in [-2147483648,2147483647] */
/* causes overflow:
#define FLOAT_TO_INT(X) ( (((GLint) (4294967294.0F * (X))) - 1) / 2 )
*/
/* a close approximation: */
#define FLOAT_TO_INT(X) ( (GLint) (2147483647.0 * (X)) )
/* Memory copy: */
#ifdef SUNOS4
#define MEMCPY( DST, SRC, BYTES) \
memcpy( (char *) (DST), (char *) (SRC), (int) (BYTES) )
#else
#define MEMCPY( DST, SRC, BYTES) \
memcpy( (void *) (DST), (void *) (SRC), (size_t) (BYTES) )
#endif
/* Memory set: */
#ifdef SUNOS4
#define MEMSET( DST, VAL, N ) \
memset( (char *) (DST), (int) (VAL), (int) (N) )
#else
#define MEMSET( DST, VAL, N ) \
memset( (void *) (DST), (int) (VAL), (size_t) (N) )
#endif
/* MACs don't support static larger than 32kb, so... */
#ifdef __QUICKDRAW__
#define MAC_ALLOC NewPtr
#define MAC_FREE DisposePtr
#define DEFARRAY(TYPE,NAME,SIZE) TYPE *NAME = (TYPE*)MAC_ALLOC(sizeof(TYPE)*SIZE)
#define UNDEFARRAY(NAME) MAC_FREE((char*)NAME)
#else
#define DEFARRAY(TYPE,NAME,SIZE) TYPE NAME[SIZE]
#define UNDEFARRAY(NAME)
#endif
/* Pi */
#ifndef M_PI
#define M_PI (3.1415926)
#endif
#ifndef NULL
#define NULL 0
#endif
#endif /*MACROS_H*/
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