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/* $Id: s_fog.h,v 1.5 2001/06/18 23:55:18 brianp Exp $ */

/*
 * Mesa 3-D graphics library
 * Version:  3.5
 *
 * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */


#ifndef S_FOG_H
#define S_FOG_H


#include "mtypes.h"
#include "swrast.h"


extern GLfloat
_mesa_z_to_fogfactor(GLcontext *ctx, GLfloat z);


extern void
_mesa_fog_rgba_pixels( const GLcontext *ctx,
                       GLuint n, const GLfloat fog[],
                       GLchan rgba[][4] );

extern void
_mesa_fog_ci_pixels( const GLcontext *ctx,
                     GLuint n, const GLfloat fog[], GLuint indx[] );

extern void
_mesa_win_fog_coords_from_z( const GLcontext *ctx,
			     GLuint n,
			     const GLdepth z[],
			     GLfloat fogcoord[] );

extern void
_mesa_depth_fog_rgba_pixels( const GLcontext *ctx,
			     GLuint n, const GLdepth z[], GLchan rgba[][4] );

extern void
_mesa_depth_fog_ci_pixels( const GLcontext *ctx,
			   GLuint n, const GLdepth z[], GLuint index[] );


#endif