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/*************************************************************************
* Copyright (C) 2009-2014 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 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_tcolor 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_matrix trans; ///< Transformation matrix.
dmnsn_matrix trans_inv; ///< The inverse of the transformation matrix.
/// Quick color -- used for low-quality renders.
dmnsn_tcolor quick_color;
bool initialized; /// @internal Whether the pigment is initialized.
};
/**
* Allocate a new dummy pigment.
* @param[in] pool The memory pool to allocate from.
* @return The allocated pigment.
*/
dmnsn_pigment *dmnsn_new_pigment(dmnsn_pool *pool);
/**
* Initialize a dmnsn_pigment field.
* @param[out] pigment The pigment to initialize.
*/
void dmnsn_init_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_pigment_initialize(dmnsn_pigment *pigment);
/**
* Evaluate the color of a pigment at a point.
* @param[in] pigment The pigment to evaluate.
* @param[in] v The point to color.
* @return The color at \p v.
*/
dmnsn_tcolor dmnsn_pigment_evaluate(const dmnsn_pigment *pigment,
dmnsn_vector v);
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