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92 lines
3.4 KiB
C
92 lines
3.4 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 7.3
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*
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* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* New (3.1) transformation code written by Keith Whitwell.
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*/
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#ifndef _M_VECTOR_H_
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#define _M_VECTOR_H_
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#include "main/glheader.h"
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#define VEC_DIRTY_0 0x1
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#define VEC_DIRTY_1 0x2
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#define VEC_DIRTY_2 0x4
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#define VEC_DIRTY_3 0x8
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#define VEC_MALLOC 0x10 /* storage field points to self-allocated mem*/
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#define VEC_NOT_WRITEABLE 0x40 /* writable elements to hold clipped data */
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#define VEC_BAD_STRIDE 0x100 /* matches tnl's prefered stride */
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#define VEC_SIZE_1 VEC_DIRTY_0
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#define VEC_SIZE_2 (VEC_DIRTY_0|VEC_DIRTY_1)
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#define VEC_SIZE_3 (VEC_DIRTY_0|VEC_DIRTY_1|VEC_DIRTY_2)
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#define VEC_SIZE_4 (VEC_DIRTY_0|VEC_DIRTY_1|VEC_DIRTY_2|VEC_DIRTY_3)
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/**
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* Wrap all the information about vectors up in a struct. Has
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* additional fields compared to the other vectors to help us track of
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* different vertex sizes, and whether we need to clean columns out
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* because they contain non-(0,0,0,1) values.
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*
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* The start field is used to reserve data for copied vertices at the
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* end of _mesa_transform_vb, and avoids the need for a multiplication in
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* the transformation routines.
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*/
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typedef struct {
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GLfloat (*data)[4]; /**< may be malloc'd or point to client data */
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GLfloat *start; /**< points somewhere inside of <data> */
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GLuint count; /**< size of the vector (in elements) */
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GLuint stride; /**< stride from one element to the next (in bytes) */
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GLuint size; /**< 2-4 for vertices and 1-4 for texcoords */
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GLbitfield flags; /**< bitmask of VEC_x flags */
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void *storage; /**< self-allocated storage */
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GLuint storage_count; /**< storage size in elements */
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} GLvector4f;
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extern void _mesa_vector4f_init( GLvector4f *v, GLbitfield flags,
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GLfloat (*storage)[4] );
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extern void _mesa_vector4f_alloc( GLvector4f *v, GLbitfield flags,
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GLuint count, GLuint alignment );
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extern void _mesa_vector4f_free( GLvector4f *v );
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extern void _mesa_vector4f_print( const GLvector4f *v, const GLubyte *, GLboolean );
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extern void _mesa_vector4f_clean_elem( GLvector4f *vec, GLuint nr, GLuint elt );
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/**
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* Given vector <v>, return a pointer (cast to <type *> to the <i>-th element.
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*
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* End up doing a lot of slow imuls if not careful.
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*/
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#define VEC_ELT( v, type, i ) \
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( (type *) ( ((GLbyte *) ((v)->data)) + (i) * (v)->stride) )
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#endif
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