/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software  Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

/** \file
 * \ingroup DNA
 */

#ifndef __DNA_LIGHTPROBE_TYPES_H__
#define __DNA_LIGHTPROBE_TYPES_H__

#include "DNA_defs.h"
#include "DNA_listBase.h"
#include "DNA_ID.h"

#ifdef __cplusplus
extern "C" {
#endif

struct AnimData;
struct Object;

typedef struct LightProbe {
	ID id;
	/** Animation data (must be immediately after id for utilities to use it). */
	struct AnimData *adt;

	/** For realtime probe objects. */
	char type;
	/** General purpose flags for probes. */
	char flag;
	/** Attenuation type. */
	char attenuation_type;
	/** Parallax type. */
	char parallax_type;

	/** Influence Radius. */
	float distinf;
	/** Parallax Radius. */
	float distpar;
	/** Influence falloff. */
	float falloff;

	float clipsta, clipend;

	/** VSM visibility biases. */
	float vis_bias, vis_bleedbias;
	float vis_blur;

	/** Intensity multiplier. */
	float intensity;

	/** Irradiance grid resolution. */
	int grid_resolution_x;
	int grid_resolution_y;
	int grid_resolution_z;
	int pad1;

	/** Object to use as a parallax origin. */
	struct Object *parallax_ob;
	/** Image to use on as lighting data. */
	struct Image *image;
	/** Object visibility group, inclusive or exclusive. */
	struct Collection *visibility_grp;

	/* Runtime display data */
	float distfalloff, distgridinf;
	float pad[2];
} LightProbe;

/* Probe->type */
enum {
	LIGHTPROBE_TYPE_CUBE      = 0,
	LIGHTPROBE_TYPE_PLANAR    = 1,
	LIGHTPROBE_TYPE_GRID      = 2,
};

/* Probe->flag */
enum {
	LIGHTPROBE_FLAG_CUSTOM_PARALLAX = (1 << 0),
	LIGHTPROBE_FLAG_SHOW_INFLUENCE  = (1 << 1),
	LIGHTPROBE_FLAG_SHOW_PARALLAX   = (1 << 2),
	LIGHTPROBE_FLAG_SHOW_CLIP_DIST  = (1 << 3),
	LIGHTPROBE_FLAG_SHOW_DATA       = (1 << 4),
	LIGHTPROBE_FLAG_INVERT_GROUP    = (1 << 5),
};

/* Probe->display */
enum {
	LIGHTPROBE_DISP_WIRE         = 0,
	LIGHTPROBE_DISP_SHADED       = 1,
	LIGHTPROBE_DISP_DIFFUSE      = 2,
	LIGHTPROBE_DISP_REFLECTIVE   = 3,
};

/* Probe->parallax && Probe->attenuation_type*/
enum {
	LIGHTPROBE_SHAPE_ELIPSOID   = 0,
	LIGHTPROBE_SHAPE_BOX        = 1,
};

/* ------- Eevee LightProbes ------- */
/* Needs to be there because written to file
 * with the lightcache. */

typedef struct LightProbeCache {
	float position[3], parallax_type;
	float attenuation_fac;
	float attenuation_type;
	float pad3[2];
	float attenuationmat[4][4];
	float parallaxmat[4][4];
} LightProbeCache;

typedef struct LightGridCache {
	float mat[4][4];
	/** Offset to the first irradiance sample in the pool. */
	int resolution[3], offset;
	float corner[3], attenuation_scale;
	/** World space vector between 2 opposite cells. */
	float increment_x[3], attenuation_bias;
	float increment_y[3], level_bias;
	float increment_z[3], pad4;
	float visibility_bias, visibility_bleed, visibility_range, pad5;
} LightGridCache;

/* ------ Eevee Lightcache ------- */

typedef struct LightCacheTexture {
	struct GPUTexture *tex;
	/* Copy of GPU datas to create GPUTextures on file read. */
	char *data;
	int tex_size[3];
	char data_type;
	char components;
	char pad[2];
} LightCacheTexture;

typedef struct LightCache {
	int flag;
	/* only a single cache for now */
	/** Number of probes to use for rendering. */
	int cube_len, grid_len;
	/** Number of mipmap level to use. */
	int mips_len;
	/** Size of a visibility/reflection sample. */
	int vis_res, ref_res;
	int pad[2];
	/* In the future, we could create a bigger texture containing
	 * multiple caches (for animation) and interpolate between the
	 * caches overtime to another texture. */
	LightCacheTexture grid_tx;
	/** Contains data for mipmap level 0. */
	LightCacheTexture cube_tx;
	/** Does not contains valid GPUTexture, only data. */
	LightCacheTexture *cube_mips;
	/* All lightprobes data contained in the cache. */
	LightProbeCache *cube_data;
	LightGridCache  *grid_data;
} LightCache;

/* LightCache->flag */
enum {
	LIGHTCACHE_BAKED            = (1 << 0),
	LIGHTCACHE_BAKING           = (1 << 1),
	LIGHTCACHE_CUBE_READY       = (1 << 2),
	LIGHTCACHE_GRID_READY       = (1 << 3),
	/* Update tagging */
	LIGHTCACHE_UPDATE_CUBE      = (1 << 4),
	LIGHTCACHE_UPDATE_GRID      = (1 << 5),
	LIGHTCACHE_UPDATE_WORLD     = (1 << 6),
	LIGHTCACHE_UPDATE_AUTO      = (1 << 7),
};

/* EEVEE_LightCacheTexture->data_type */
enum {
	LIGHTCACHETEX_BYTE          = (1 << 0),
	LIGHTCACHETEX_FLOAT         = (1 << 1),
	LIGHTCACHETEX_UINT          = (1 << 2),
};

#ifdef __cplusplus
}
#endif

#endif /* __DNA_LIGHTPROBE_TYPES_H__ */