src/mesa/math/m_vector.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.3
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /*
  26  * New (3.1) transformation code written by Keith Whitwell.
  27  */
  28
  29
  30 #ifndef _M_VECTOR_H_
  31 #define _M_VECTOR_H_
  32
  33 #include "main/glheader.h"
  34 #include "main/mtypes.h"                /* hack for GLchan */
  35
  36
  37 #define VEC_DIRTY_0        0x1
  38 #define VEC_DIRTY_1        0x2
  39 #define VEC_DIRTY_2        0x4
  40 #define VEC_DIRTY_3        0x8
  41 #define VEC_MALLOC         0x10 /* storage field points to self-allocated mem*/
  42 #define VEC_NOT_WRITEABLE  0x40 /* writable elements to hold clipped data */
  43 #define VEC_BAD_STRIDE     0x100 /* matches tnl's prefered stride */
  44
  45
  46 #define VEC_SIZE_1   VEC_DIRTY_0
  47 #define VEC_SIZE_2   (VEC_DIRTY_0|VEC_DIRTY_1)
  48 #define VEC_SIZE_3   (VEC_DIRTY_0|VEC_DIRTY_1|VEC_DIRTY_2)
  49 #define VEC_SIZE_4   (VEC_DIRTY_0|VEC_DIRTY_1|VEC_DIRTY_2|VEC_DIRTY_3)
  50
  51
  52
  53 /* Wrap all the information about vectors up in a struct.  Has
  54  * additional fields compared to the other vectors to help us track of
  55  * different vertex sizes, and whether we need to clean columns out
  56  * because they contain non-(0,0,0,1) values.
  57  *
  58  * The start field is used to reserve data for copied vertices at the
  59  * end of _mesa_transform_vb, and avoids the need for a multiplication in
  60  * the transformation routines.
  61  */
  62 typedef struct {
  63    GLfloat (*data)[4];  /* may be malloc'd or point to client data */
  64    GLfloat *start;      /* points somewhere inside of <data> */
  65    GLuint count;        /* size of the vector (in elements) */
  66    GLuint stride;       /* stride from one element to the next (in bytes) */
  67    GLuint size;         /* 2-4 for vertices and 1-4 for texcoords */
  68    GLuint flags;        /* which columns are dirty */
  69    void *storage;       /* self-allocated storage */
  70 } GLvector4f;
  71
  72
  73 extern void _mesa_vector4f_init( GLvector4f *v, GLuint flags,
  74                               GLfloat (*storage)[4] );
  75 extern void _mesa_vector4f_alloc( GLvector4f *v, GLuint flags,
  76                                GLuint count, GLuint alignment );
  77 extern void _mesa_vector4f_free( GLvector4f *v );
  78 extern void _mesa_vector4f_print( GLvector4f *v, GLubyte *, GLboolean );
  79 extern void _mesa_vector4f_clean_elem( GLvector4f *vec, GLuint nr, GLuint elt );
  80
  81
  82
  83
  84
  85 /*
  86  * Given vector <v>, return a pointer (cast to <type *> to the <i>-th element.
  87  *
  88  * End up doing a lot of slow imuls if not careful.
  89  */
  90 #define VEC_ELT( v, type, i ) \
  91        ( (type *)  ( ((GLbyte *) ((v)->data)) + (i) * (v)->stride) )
  92
  93
  94 #endif