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/*************************************************************************
* Copyright (C) 2009-2011 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Object finishes.
*/
/* Ambient component */
typedef struct dmnsn_ambient dmnsn_ambient;
/**
* Ambient light callback.
* @param[in] ambient The ambient object itself.
* @param[in] pigment The pigment of the object.
* @return The ambient contribution to the object's color.
*/
typedef dmnsn_color dmnsn_ambient_fn(const dmnsn_ambient *ambient,
dmnsn_color pigment);
/** Ambient finish component. */
struct dmnsn_ambient {
dmnsn_color ambient; /**< Ambient light. */
dmnsn_refcount refcount; /**< @internal Reference count. */
};
/** Allocate a dummy ambient component. */
dmnsn_ambient *dmnsn_new_ambient(dmnsn_color ambient);
/** Delete an ambient component. */
void dmnsn_delete_ambient(dmnsn_ambient *ambient);
/* Diffuse component */
typedef struct dmnsn_diffuse dmnsn_diffuse;
/**
* Diffuse reflection callback.
* @param[in] diffuse The diffuse object itself.
* @param[in] light The color of the light illuminating the object.
* @param[in] color The pigment of the object.
* @param[in] ray The direction of the light source.
* @param[in] normal The normal vector of the surface.
* @return The diffuse reflection component of the object's color.
*/
typedef dmnsn_color dmnsn_diffuse_fn(const dmnsn_diffuse *diffuse,
dmnsn_color light, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal);
/** Diffuse finish component. */
struct dmnsn_diffuse {
dmnsn_diffuse_fn *diffuse_fn; /**< Diffuse callback. */
dmnsn_free_fn *free_fn; /**< Destructor callback. */
void *ptr; /**< Generic data pointer. */
dmnsn_refcount refcount; /**< @internal Reference count. */
};
/** Allocate a dummy diffuse component. */
dmnsn_diffuse *dmnsn_new_diffuse(void);
/** Delete a diffuse component. */
void dmnsn_delete_diffuse(dmnsn_diffuse *diffuse);
/* Specular component */
typedef struct dmnsn_specular dmnsn_specular;
/**
* Specular highlight callback.
* @param[in] specular The specular object itself.
* @param[in] light The color of the light illuminating the object.
* @param[in] color The pigment of the object.
* @param[in] ray The direction of the light source.
* @param[in] normal The normal vector of the surface.
* @param[in] viewer The direction of the viewer.
* @return The specular reflection component of the object's color.
*/
typedef dmnsn_color dmnsn_specular_fn(const dmnsn_specular *specular,
dmnsn_color light, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal,
dmnsn_vector viewer);
/** Specular finish component. */
struct dmnsn_specular {
dmnsn_specular_fn *specular_fn; /**< Specular callback. */
dmnsn_free_fn *free_fn; /**< Destructor callback. */
void *ptr; /**< Generic data pointer. */
dmnsn_refcount refcount; /**< @internal Reference count. */
};
/** Allocate a dummy specular component. */
dmnsn_specular *dmnsn_new_specular(void);
/** Delete a specular component. */
void dmnsn_delete_specular(dmnsn_specular *specular);
/* Reflection component */
typedef struct dmnsn_reflection dmnsn_reflection;
/**
* Reflected light callback.
* @param[in] reflection The reflection object itself.
* @param[in] reflect The color of the reflected ray.
* @param[in] color The pigment of the object.
* @param[in] ray The direction of the reflected ray.
* @param[in] normal The normal vector of the surface.
* @return The contribution of the reflected ray to the object's color.
*/
typedef dmnsn_color dmnsn_reflection_fn(const dmnsn_reflection *reflection,
dmnsn_color reflect, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal);
/** The reflection component. */
struct dmnsn_reflection {
dmnsn_reflection_fn *reflection_fn; /**< Reflection callback. */
dmnsn_free_fn *free_fn; /**< Destructor callback. */
void *ptr; /**< Generic data pointer. */
dmnsn_refcount refcount; /**< @internal Reference count. */
};
/** Allocate a dummy reflection component. */
dmnsn_reflection *dmnsn_new_reflection(void);
/** Delete a reflection component. */
void dmnsn_delete_reflection(dmnsn_reflection *reflection);
/* Entire finishes */
/** A finish. */
typedef struct dmnsn_finish {
dmnsn_ambient *ambient; /**< Ambient component. */
dmnsn_diffuse *diffuse; /**< Diffuse component. */
dmnsn_specular *specular; /**< Specular component. */
dmnsn_reflection *reflection; /**< Reflection component. */
} dmnsn_finish;
/**
* Create a new blank finish.
* @return The new finish.
*/
dmnsn_finish dmnsn_new_finish(void);
/**
* Delete a finish.
* @param[in,out] finish The finish to delete.
*/
void dmnsn_delete_finish(dmnsn_finish finish);
/**
* Increment a finish's reference count.
* @param[in,out] finish The finish to acquire.
*/
void dmnsn_finish_incref(dmnsn_finish *finish);
/**
* Fill missing finish properties from a default finish.
* @param[in] default_finish The default finish.
* @param[in,out] finish The finish to fill.
*/
void dmnsn_finish_cascade(const dmnsn_finish *default_finish,
dmnsn_finish *finish);
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