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- /* $Id: macros.h,v 1.4 1997/02/03 20:31:26 brianp Exp $ */
-
- /*
- * Mesa 3-D graphics library
- * Version: 2.2
- * Copyright (C) 1995-1997 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 1.4 1997/02/03 20:31:26 brianp
- * added DEFARRAY and UNDEFARRAY macros for BeOS
- *
- * Revision 1.3 1996/10/31 01:12:00 brianp
- * removed (GLint) from FLOAT_TO_UINT() macro
- *
- * 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) ((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 and BeOS don't support static larger than 32kb, so... */
- #if defined(__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)
- #elif defined(__BEOS__)
- # define DEFARRAY(TYPE,NAME,SIZE) TYPE *NAME = malloc(sizeof(TYPE)*(SIZE))
- # define UNDEFARRAY(NAME) free(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*/
-