1 
2 /*
3  * Mesa 3-D graphics library
4  * Version:  3.5
5  *
6  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
7  *
8  * Permission is hereby granted, free of charge, to any person obtaining a
9  * copy of this software and associated documentation files (the "Software"),
10  * to deal in the Software without restriction, including without limitation
11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12  * and/or sell copies of the Software, and to permit persons to whom the
13  * Software is furnished to do so, subject to the following conditions:
14  *
15  * The above copyright notice and this permission notice shall be included
16  * in all copies or substantial portions of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24  */
25 
26 /*
27  * Clip test function interface for assembly code.  Simply define
28  * FRAME_OFFSET to the number of bytes pushed onto the stack before
29  * using the ARG_* argument macros.
30  *
31  * Gareth Hughes
32  */
33 
34 #ifndef __CLIP_ARGS_H__
35 #define __CLIP_ARGS_H__
36 
37 /*
38  * Offsets for clip_func arguments
39  *
40  * typedef GLvector4f *(*clip_func)( GLvector4f *clip_vec,
41  *	                             GLvector4f *proj_vec,
42  *	                             GLubyte clipMask[],
43  *	                             GLubyte *orMask,
44  *	                             GLubyte *andMask );
45  */
46 
47 #define OFFSET_SOURCE	4
48 #define OFFSET_DEST	8
49 #define OFFSET_CLIP	12
50 #define OFFSET_OR	16
51 #define OFFSET_AND	20
52 
53 #define ARG_SOURCE	REGOFF(FRAME_OFFSET+OFFSET_SOURCE, ESP)
54 #define ARG_DEST	REGOFF(FRAME_OFFSET+OFFSET_DEST, ESP)
55 #define ARG_CLIP	REGOFF(FRAME_OFFSET+OFFSET_CLIP, ESP)
56 #define ARG_OR		REGOFF(FRAME_OFFSET+OFFSET_OR, ESP)
57 #define ARG_AND		REGOFF(FRAME_OFFSET+OFFSET_AND, ESP)
58 
59 #endif
60