/*
 * 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.
 *
 * The Original Code is Copyright (C) 2009 by Nicholas Bishop
 * All rights reserved.
 */

#ifndef __BKE_PAINT_H__
#define __BKE_PAINT_H__

/** \file
 * \ingroup bke
 */

struct BMFace;
struct BMesh;
struct Brush;
struct CurveMapping;
struct Depsgraph;
struct EnumPropertyItem;
struct GridPaintMask;
struct ImagePool;
struct MFace;
struct MLoop;
struct MLoopTri;
struct MVert;
struct Main;
struct Mesh;
struct MeshElemMap;
struct Object;
struct PBVH;
struct Paint;
struct PaintCurve;
struct Palette;
struct PaletteColor;
struct ReportList;
struct Scene;
struct Sculpt;
struct StrokeCache;
struct SubdivCCG;
struct SubdivCCG;
struct Tex;
struct ToolSettings;
struct UnifiedPaintSettings;
struct ViewLayer;
struct bContext;
struct bToolRef;

enum eOverlayFlags;

#include "DNA_object_enums.h"

extern const char PAINT_CURSOR_SCULPT[3];
extern const char PAINT_CURSOR_VERTEX_PAINT[3];
extern const char PAINT_CURSOR_WEIGHT_PAINT[3];
extern const char PAINT_CURSOR_TEXTURE_PAINT[3];

typedef enum ePaintMode {
  PAINT_MODE_SCULPT = 0,
  /** Vertex color. */
  PAINT_MODE_VERTEX = 1,
  PAINT_MODE_WEIGHT = 2,
  /** 3D view (projection painting). */
  PAINT_MODE_TEXTURE_3D = 3,
  /** Image space (2D painting). */
  PAINT_MODE_TEXTURE_2D = 4,
  PAINT_MODE_SCULPT_UV = 5,
  PAINT_MODE_GPENCIL = 6,

  /** Keep last. */
  PAINT_MODE_INVALID = 7,
} ePaintMode;

#define PAINT_MODE_HAS_BRUSH(mode) !ELEM(mode, PAINT_MODE_SCULPT_UV)

/* overlay invalidation */
typedef enum eOverlayControlFlags {
  PAINT_OVERLAY_INVALID_TEXTURE_PRIMARY = 1,
  PAINT_OVERLAY_INVALID_TEXTURE_SECONDARY = (1 << 2),
  PAINT_OVERLAY_INVALID_CURVE = (1 << 3),
  PAINT_OVERLAY_OVERRIDE_CURSOR = (1 << 4),
  PAINT_OVERLAY_OVERRIDE_PRIMARY = (1 << 5),
  PAINT_OVERLAY_OVERRIDE_SECONDARY = (1 << 6),
} eOverlayControlFlags;

#define PAINT_OVERRIDE_MASK \
  (PAINT_OVERLAY_OVERRIDE_SECONDARY | PAINT_OVERLAY_OVERRIDE_PRIMARY | \
   PAINT_OVERLAY_OVERRIDE_CURSOR)

void BKE_paint_invalidate_overlay_tex(struct Scene *scene,
                                      struct ViewLayer *view_layer,
                                      const struct Tex *tex);
void BKE_paint_invalidate_cursor_overlay(struct Scene *scene,
                                         struct ViewLayer *view_layer,
                                         struct CurveMapping *curve);
void BKE_paint_invalidate_overlay_all(void);
eOverlayControlFlags BKE_paint_get_overlay_flags(void);
void BKE_paint_reset_overlay_invalid(eOverlayControlFlags flag);
void BKE_paint_set_overlay_override(enum eOverlayFlags flag);

/* palettes */
void BKE_palette_init(struct Palette *palette);
void BKE_palette_free(struct Palette *palette);
struct Palette *BKE_palette_add(struct Main *bmain, const char *name);
void BKE_palette_copy_data(struct Main *bmain,
                           struct Palette *palette_dst,
                           const struct Palette *palette_src,
                           const int flag);
struct Palette *BKE_palette_copy(struct Main *bmain, const struct Palette *palette);
void BKE_palette_make_local(struct Main *bmain, struct Palette *palette, const bool lib_local);
struct PaletteColor *BKE_palette_color_add(struct Palette *palette);
bool BKE_palette_is_empty(const struct Palette *palette);
void BKE_palette_color_remove(struct Palette *palette, struct PaletteColor *color);
void BKE_palette_clear(struct Palette *palette);

/* paint curves */
struct PaintCurve *BKE_paint_curve_add(struct Main *bmain, const char *name);
void BKE_paint_curve_free(struct PaintCurve *pc);
void BKE_paint_curve_copy_data(struct Main *bmain,
                               struct PaintCurve *pc_dst,
                               const struct PaintCurve *pc_src,
                               const int flag);
struct PaintCurve *BKE_paint_curve_copy(struct Main *bmain, const struct PaintCurve *pc);
void BKE_paint_curve_make_local(struct Main *bmain, struct PaintCurve *pc, const bool lib_local);

bool BKE_paint_ensure(const struct ToolSettings *ts, struct Paint **r_paint);
void BKE_paint_init(struct Main *bmain, struct Scene *sce, ePaintMode mode, const char col[3]);
void BKE_paint_free(struct Paint *p);
void BKE_paint_copy(struct Paint *src, struct Paint *tar, const int flag);

void BKE_paint_runtime_init(const struct ToolSettings *ts, struct Paint *paint);

void BKE_paint_cavity_curve_preset(struct Paint *p, int preset);

eObjectMode BKE_paint_object_mode_from_paintmode(ePaintMode mode);
bool BKE_paint_ensure_from_paintmode(struct Scene *sce, ePaintMode mode);
struct Paint *BKE_paint_get_active_from_paintmode(struct Scene *sce, ePaintMode mode);
const struct EnumPropertyItem *BKE_paint_get_tool_enum_from_paintmode(ePaintMode mode);
const char *BKE_paint_get_tool_prop_id_from_paintmode(ePaintMode mode);
uint BKE_paint_get_brush_tool_offset_from_paintmode(const ePaintMode mode);
struct Paint *BKE_paint_get_active(struct Scene *sce, struct ViewLayer *view_layer);
struct Paint *BKE_paint_get_active_from_context(const struct bContext *C);
ePaintMode BKE_paintmode_get_active_from_context(const struct bContext *C);
ePaintMode BKE_paintmode_get_from_tool(const struct bToolRef *tref);
struct Brush *BKE_paint_brush(struct Paint *paint);
void BKE_paint_brush_set(struct Paint *paint, struct Brush *br);
struct Palette *BKE_paint_palette(struct Paint *paint);
void BKE_paint_palette_set(struct Paint *p, struct Palette *palette);
void BKE_paint_curve_set(struct Brush *br, struct PaintCurve *pc);
void BKE_paint_curve_clamp_endpoint_add_index(struct PaintCurve *pc, const int add_index);

void BKE_paint_data_warning(
    struct ReportList *reports, bool uvs, bool mat, bool tex, bool stencil);
bool BKE_paint_proj_mesh_data_check(
    struct Scene *scene, struct Object *ob, bool *uvs, bool *mat, bool *tex, bool *stencil);

/* testing face select mode
 * Texture paint could be removed since selected faces are not used
 * however hiding faces is useful */
bool BKE_paint_select_face_test(struct Object *ob);
bool BKE_paint_select_vert_test(struct Object *ob);
bool BKE_paint_select_elem_test(struct Object *ob);

/* partial visibility */
bool paint_is_face_hidden(const struct MLoopTri *lt,
                          const struct MVert *mvert,
                          const struct MLoop *mloop);
bool paint_is_grid_face_hidden(const unsigned int *grid_hidden, int gridsize, int x, int y);
bool paint_is_bmesh_face_hidden(struct BMFace *f);

/* paint masks */
float paint_grid_paint_mask(const struct GridPaintMask *gpm,
                            unsigned level,
                            unsigned x,
                            unsigned y);

/* stroke related */
bool paint_calculate_rake_rotation(struct UnifiedPaintSettings *ups,
                                   struct Brush *brush,
                                   const float mouse_pos[2]);
void paint_update_brush_rake_rotation(struct UnifiedPaintSettings *ups,
                                      struct Brush *brush,
                                      float rotation);

void BKE_paint_stroke_get_average(struct Scene *scene, struct Object *ob, float stroke[3]);

/* Tool slot API. */
void BKE_paint_toolslots_init_from_main(struct Main *bmain);
void BKE_paint_toolslots_len_ensure(struct Paint *paint, int len);
void BKE_paint_toolslots_brush_update_ex(struct Paint *paint, struct Brush *brush);
void BKE_paint_toolslots_brush_update(struct Paint *paint);
void BKE_paint_toolslots_brush_validate(struct Main *bmain, struct Paint *paint);
struct Brush *BKE_paint_toolslots_brush_get(struct Paint *paint, int slot_index);

/* Used for both vertex color and weight paint */
struct SculptVertexPaintGeomMap {
  int *vert_map_mem;
  struct MeshElemMap *vert_to_loop;
  int *poly_map_mem;
  struct MeshElemMap *vert_to_poly;
};

/* Session data (mode-specific) */

typedef struct SculptSession {
  /* Mesh data (not copied) can come either directly from a Mesh, or from a MultiresDM */
  struct MultiresModifierData *multires; /* Special handling for multires meshes */
  struct MVert *mvert;
  struct MPoly *mpoly;
  struct MLoop *mloop;
  int totvert, totpoly;
  struct KeyBlock *kb;
  float *vmask;

  /* Mesh connectivity */
  struct MeshElemMap *pmap;
  int *pmap_mem;

  /* BMesh for dynamic topology sculpting */
  struct BMesh *bm;
  int cd_vert_node_offset;
  int cd_face_node_offset;
  bool bm_smooth_shading;
  /* Undo/redo log for dynamic topology sculpting */
  struct BMLog *bm_log;

  /* Limit surface/grids. */
  struct SubdivCCG *subdiv_ccg;

  /* PBVH acceleration structure */
  struct PBVH *pbvh;
  bool show_diffuse_color;
  bool show_mask;

  /* Painting on deformed mesh */
  bool modifiers_active;       /* object is deformed with some modifiers */
  float (*orig_cos)[3];        /* coords of undeformed mesh */
  float (*deform_cos)[3];      /* coords of deformed mesh but without stroke displacement */
  float (*deform_imats)[3][3]; /* crazyspace deformation matrices */

  /* Partial redraw */
  bool partial_redraw;

  /* Used to cache the render of the active texture */
  unsigned int texcache_side, *texcache, texcache_actual;
  struct ImagePool *tex_pool;

  /* Layer brush persistence between strokes */
  float (*layer_co)[3]; /* Copy of the mesh vertices' locations */

  struct StrokeCache *cache;

  union {
    struct {
      struct SculptVertexPaintGeomMap gmap;

      /* For non-airbrush painting to re-apply from the original (MLoop aligned). */
      unsigned int *previous_color;
    } vpaint;

    struct {
      struct SculptVertexPaintGeomMap gmap;
      /* Keep track of how much each vertex has been painted (non-airbrush only). */
      float *alpha_weight;

      /* Needed to continuously re-apply over the same weights (BRUSH_ACCUMULATE disabled).
       * Lazy initialize as needed (flag is set to 1 to tag it as uninitialized). */
      struct MDeformVert *dvert_prev;
    } wpaint;

    /* TODO: identify sculpt-only fields */
    // struct { ... } sculpt;
  } mode;
  int mode_type;

  /* This flag prevents PBVH from being freed when creating the vp_handle for texture paint. */
  bool building_vp_handle;
} SculptSession;

void BKE_sculptsession_free(struct Object *ob);
void BKE_sculptsession_free_deformMats(struct SculptSession *ss);
void BKE_sculptsession_free_vwpaint_data(struct SculptSession *ss);
void BKE_sculptsession_bm_to_me(struct Object *ob, bool reorder);
void BKE_sculptsession_bm_to_me_for_render(struct Object *object);
void BKE_sculpt_update_mesh_elements(struct Depsgraph *depsgraph,
                                     struct Scene *scene,
                                     struct Sculpt *sd,
                                     struct Object *ob,
                                     bool need_pmap,
                                     bool need_mask);
struct MultiresModifierData *BKE_sculpt_multires_active(struct Scene *scene, struct Object *ob);
int BKE_sculpt_mask_layers_ensure(struct Object *ob, struct MultiresModifierData *mmd);
void BKE_sculpt_toolsettings_data_ensure(struct Scene *scene);

struct PBVH *BKE_sculpt_object_pbvh_ensure(struct Depsgraph *depsgraph, struct Object *ob);

void BKE_sculpt_bvh_update_from_ccg(struct PBVH *pbvh, struct SubdivCCG *subdiv_ccg);

enum {
  SCULPT_MASK_LAYER_CALC_VERT = (1 << 0),
  SCULPT_MASK_LAYER_CALC_LOOP = (1 << 1),
};
#endif