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/*

 * Mesa 3-D graphics library

 * Version:  7.5

 *

 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.

 * Copyright (C) 2009  VMware, Inc.  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 LIGHT_H

#define LIGHT_H

#include "glheader.h"

#include "mfeatures.h"

struct gl_context;

struct gl_light;

struct gl_material;

extern void GLAPIENTRY

_mesa_ShadeModel( GLenum mode );

extern void GLAPIENTRY

_mesa_ProvokingVertexEXT(GLenum mode);

#if _HAVE_FULL_GL

extern void GLAPIENTRY

_mesa_ColorMaterial( GLenum face, GLenum mode );

extern void GLAPIENTRY

_mesa_Lightf( GLenum light, GLenum pname, GLfloat param );

extern void GLAPIENTRY

_mesa_Lightfv( GLenum light, GLenum pname, const GLfloat *params );

extern void GLAPIENTRY

_mesa_Lightiv( GLenum light, GLenum pname, const GLint *params );

extern void GLAPIENTRY

_mesa_Lighti( GLenum light, GLenum pname, GLint param );

extern void GLAPIENTRY

_mesa_LightModelf( GLenum pname, GLfloat param );

extern void GLAPIENTRY

_mesa_LightModelfv( GLenum pname, const GLfloat *params );

extern void GLAPIENTRY

_mesa_LightModeli( GLenum pname, GLint param );

extern void GLAPIENTRY

_mesa_LightModeliv( GLenum pname, const GLint *params );

extern void GLAPIENTRY

_mesa_GetLightfv( GLenum light, GLenum pname, GLfloat *params );

extern void GLAPIENTRY

_mesa_GetLightiv( GLenum light, GLenum pname, GLint *params );

extern void GLAPIENTRY

_mesa_GetMaterialfv( GLenum face, GLenum pname, GLfloat *params );

extern void GLAPIENTRY

_mesa_GetMaterialiv( GLenum face, GLenum pname, GLint *params );

extern void

_mesa_light(struct gl_context *ctx, GLuint lnum, GLenum pname, const GLfloat *params);

/* Lerp between adjacent values in the f(x) lookup table, giving a

 * continuous function, with adequeate overall accuracy.  (Though

 * still pretty good compared to a straight lookup).

 * Result should be a GLfloat.

 */

#define GET_SHINE_TAB_ENTRY( table, dp, result )			\

do {									\

   struct gl_shine_tab *_tab = table;					\

   float f = (dp * (SHINE_TABLE_SIZE-1));				\

   int k = (int) f;							\

   if (k < 0 /* gcc may cast an overflow float value to negative int value*/ \

	|| k > SHINE_TABLE_SIZE-2)					\

      result = (GLfloat) pow( dp, _tab->shininess );		\

   else									\

      result = _tab->tab[k] + (f-k)*(_tab->tab[k+1]-_tab->tab[k]);	\

} while (0)

extern GLuint _mesa_material_bitmask( struct gl_context *ctx,

                                      GLenum face, GLenum pname,

                                      GLuint legal,

                                      const char * );

extern void _mesa_invalidate_spot_exp_table( struct gl_light *l );

extern void _mesa_invalidate_shine_table( struct gl_context *ctx, GLuint i );

extern void _mesa_validate_all_lighting_tables( struct gl_context *ctx );

extern void _mesa_update_lighting( struct gl_context *ctx );

extern void _mesa_update_tnl_spaces( struct gl_context *ctx, GLuint new_state );

extern void _mesa_update_material( struct gl_context *ctx,

                                   GLuint bitmask );

extern void _mesa_copy_materials( struct gl_material *dst,

				  const struct gl_material *src,

				  GLuint bitmask );

extern void _mesa_update_color_material( struct gl_context *ctx,

                                         const GLfloat rgba[4] );

extern void _mesa_init_lighting( struct gl_context *ctx );

extern void _mesa_free_lighting_data( struct gl_context *ctx );

extern void _mesa_allow_light_in_model( struct gl_context *ctx, GLboolean flag );

#else

#define _mesa_update_color_material( c, r ) ((void)0)

#define _mesa_validate_all_lighting_tables( c ) ((void)0)

#define _mesa_invalidate_spot_exp_table( l ) ((void)0)

#define _mesa_material_bitmask( c, f, p, l, s ) 0

#define _mesa_init_lighting( c ) ((void)0)

#define _mesa_free_lighting_data( c ) ((void)0)

#define _mesa_update_lighting( c ) ((void)0)

#define _mesa_update_tnl_spaces( c, n ) ((void)0)

#define GET_SHINE_TAB_ENTRY( table, dp, result )  ((result)=0)

#endif

#endif