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/*************************************************************************
* Copyright (C) 2009-2010 Tavian Barnes <tavianator@gmail.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 textures.
*/
#ifndef DIMENSION_TEXTURE_H
#define DIMENSION_TEXTURE_H
/*
* Pigments
*/
/* Forward-declare dmnsn_pigment */
typedef struct dmnsn_pigment dmnsn_pigment;
/**
* Pigment callback.
* @param[in] pigment The pigment itself.
* @param[in] v The point to color.
* @return The color of the pigment at \p v.
*/
typedef dmnsn_color dmnsn_pigment_fn(const dmnsn_pigment *pigment,
dmnsn_vector v);
/**
* Pigment initializer callback.
* @param[in,out] pigment The pigment to initialize.
*/
typedef void dmnsn_pigment_initialize_fn(dmnsn_pigment *pigment);
/** A pigment. */
struct dmnsn_pigment {
dmnsn_pigment_fn *pigment_fn; /**< The pigment callback. */
dmnsn_pigment_initialize_fn *initialize_fn; /**< The initializer callback. */
dmnsn_free_fn *free_fn; /**< The destructor callback. */
dmnsn_matrix trans; /**< Transformation matrix. */
dmnsn_matrix trans_inv; /**< The inverse of the transformation matrix. */
/** Quick color -- used for low-quality renders. */
dmnsn_color quick_color;
/** Generic pointer. */
void *ptr;
};
/**
* Allocate a new dummy pigment.
* @return The allocated pigment.
*/
dmnsn_pigment *dmnsn_new_pigment(void);
/**
* Delete a pigment.
* @param[in,out] pigment The pigment to delete.
*/
void dmnsn_delete_pigment(dmnsn_pigment *pigment);
/**
* Initialize a pigment. Pigments should not be used before being initialized,
* but should not be modified after being initialized. Pigments are generally
* initialized for you.
* @param[in,out] pigment The pigment to initialize.
*/
void dmnsn_initialize_pigment(dmnsn_pigment *pigment);
/*
* Finishes
*/
/* Forward-declare dmnsn_finish */
typedef struct dmnsn_finish dmnsn_finish;
/**
* Diffuse reflection callback.
* @param[in] finish The finish 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_finish *finish,
dmnsn_color light, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal);
/**
* Specular highlight callback.
* @param[in] finish The finish 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_finish *finish,
dmnsn_color light, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal,
dmnsn_vector viewer);
/**
* Ambient light callback.
* @param[in] finish The finish 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_finish *finish,
dmnsn_color pigment);
/**
* Reflected light callback.
* @param[in] finish The finish 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_finish *finish,
dmnsn_color reflect, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal);
/** A finish. */
struct dmnsn_finish {
dmnsn_diffuse_fn *diffuse_fn; /**< The diffuse callback. */
dmnsn_specular_fn *specular_fn; /**< The specular callback. */
dmnsn_ambient_fn *ambient_fn; /**< The ambient callback. */
dmnsn_reflection_fn *reflection_fn; /**< The reflection callback. */
dmnsn_free_fn *free_fn; /**< The destruction callback. */
/** Generic pointer. */
void *ptr;
};
/**
* Allocate a new dummy finish.
* @return The allocated 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);
/*
* Textures
*/
/** A complete texture. */
typedef struct {
dmnsn_pigment *pigment; /**< Pigment. */
dmnsn_finish *finish; /**< Finish. */
dmnsn_matrix trans; /**< Transformation matrix. */
dmnsn_matrix trans_inv; /**< The inverse of the transformation matrix. */
unsigned int *refcount; /**< @internal Reference count. */
bool should_init; /**< @internal Whether to initialize the texture. */
} dmnsn_texture;
/**
* Create a blank texture.
* @return The new texture.
*/
dmnsn_texture *dmnsn_new_texture(void);
/**
* Delete a texture.
* @param[in,out] texture The texture to delete.
*/
void dmnsn_delete_texture(dmnsn_texture *texture);
/**
* Initialize a texture. Textures should not be used before being initialized,
* but should not be modified after being initialized. Textures are generally
* initialized for you.
* @param[in,out] texture The texture to initialize.
*/
void dmnsn_initialize_texture(dmnsn_texture *texture);
#endif /* DIMENSION_TEXTURE_H */
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