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