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 35 36 #define VEC_DIRTY_0 0x1 37 #define VEC_DIRTY_1 0x2 38 #define VEC_DIRTY_2 0x4 39 #define VEC_DIRTY_3 0x8 40 #define VEC_MALLOC 0x10 /* storage field points to self-allocated mem*/ 41 #define VEC_NOT_WRITEABLE 0x40 /* writable elements to hold clipped data */ 42 #define VEC_BAD_STRIDE 0x100 /* matches tnl's prefered stride */ 43 44 45 #define VEC_SIZE_1 VEC_DIRTY_0 46 #define VEC_SIZE_2 (VEC_DIRTY_0|VEC_DIRTY_1) 47 #define VEC_SIZE_3 (VEC_DIRTY_0|VEC_DIRTY_1|VEC_DIRTY_2) 48 #define VEC_SIZE_4 (VEC_DIRTY_0|VEC_DIRTY_1|VEC_DIRTY_2|VEC_DIRTY_3) 49 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 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 GLvector4f::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 GLbitfield flags; /**< bitmask of VEC_x flags */ 69 void *storage; /**< self-allocated storage */ 70 GLuint storage_count; /**< storage size in elements */ 71 } GLvector4f; 72 73 74 extern void _mesa_vector4f_init( GLvector4f *v, GLbitfield flags, 75 GLfloat (*storage)[4] ); 76 extern void _mesa_vector4f_alloc( GLvector4f *v, GLbitfield flags, 77 GLuint count, GLuint alignment ); 78 extern void _mesa_vector4f_free( GLvector4f *v ); 79 extern void _mesa_vector4f_print( const GLvector4f *v, const GLubyte *, GLboolean ); 80 extern void _mesa_vector4f_clean_elem( GLvector4f *vec, GLuint nr, GLuint elt ); 81 82 83 /** 84 * Given vector <v>, return a pointer (cast to <type *> to the <i>-th element. 85 * 86 * End up doing a lot of slow imuls if not careful. 87 */ 88 #define VEC_ELT( v, type, i ) \ 89 ( (type *) ( ((GLbyte *) ((v)->data)) + (i) * (v)->stride) ) 90 91 92 #endif 93