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70 giacomo 1
/* $Id: clip_args.h,v 1.1 2003-03-13 12:11:48 giacomo Exp $ */
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/*
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 * Mesa 3-D graphics library
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 * Version:  3.5
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 *
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 * Copyright (C) 1999-2001  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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 * Clip test function interface for assembly code.  Simply define
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 * FRAME_OFFSET to the number of bytes pushed onto the stack before
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 * using the ARG_* argument macros.
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 *
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 * Gareth Hughes
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 */
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#ifndef __CLIP_ARGS_H__
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#define __CLIP_ARGS_H__
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/*
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 * Offsets for clip_func arguments
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 *
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 * typedef GLvector4f *(*clip_func)( GLvector4f *clip_vec,
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 *                                   GLvector4f *proj_vec,
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 *                                   GLubyte clipMask[],
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 *                                   GLubyte *orMask,
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 *                                   GLubyte *andMask );
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 */
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#define OFFSET_SOURCE   4
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#define OFFSET_DEST     8
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#define OFFSET_CLIP     12
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#define OFFSET_OR       16
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#define OFFSET_AND      20
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#define ARG_SOURCE      REGOFF(FRAME_OFFSET+OFFSET_SOURCE, ESP)
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#define ARG_DEST        REGOFF(FRAME_OFFSET+OFFSET_DEST, ESP)
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#define ARG_CLIP        REGOFF(FRAME_OFFSET+OFFSET_CLIP, ESP)
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#define ARG_OR          REGOFF(FRAME_OFFSET+OFFSET_OR, ESP)
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#define ARG_AND         REGOFF(FRAME_OFFSET+OFFSET_AND, ESP)
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#endif