Descent3/editor/editor_lighting.h

/*
 * Descent 3
 * Copyright (C) 2024 Parallax Software
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#ifndef EDITOR_LIGHTING_H
#define EDITOR_LIGHTING_H

#include "3d.h"
#include "radiosity.h"
#include "room.h"
#include "object.h"
#include "lightmap_info.h"

extern vector ScratchCenters[MAX_LIGHTMAP_INFOS];
extern vector ScratchRVecs[MAX_LIGHTMAP_INFOS];
extern vector ScratchUVecs[MAX_LIGHTMAP_INFOS];
extern int AllowCombining;

extern float Room_multiplier[];
extern float Room_ambience_r[], Room_ambience_g[], Room_ambience_b[];

void DoRadiosityForRooms();
void DoRadiosityForTerrain();

void BuildElementListForRoomFace(int roomnum, int facenum, rad_surface *surf);
void BuildElementListForObjectFace(int objnum, int subobj_num, int facenum, rad_surface *surf);

// Allocates and sets a lightmap based on the surface patches given
void AssignRoomSurfaceToLightmap(int roomnum, int facenum, rad_surface *sp);

// Allocates and sets a lightmap based on the surface patches given
void AssignObjectSurfaceToLightmap(int objnum, int sobj_num, int facenum, rad_surface *sp);

// Goes through all objects int a room and fills in the lightmap data for them
void AssignLightmapsToObjectSurfacesForSingleRoom(int surface_index, int roomnum);

int ClipRadPointList(rad_point **src, rad_point **dest, int *nv, int code);

// Clips to a specific plane, putting resulting points in dest and returning number of points in dest
int ClipRadToPlane(int plane, rad_point *src, rad_point *dest, int nv);

// Takes two points and a plane, and clips.
void ClipRadEdge(int plane_flag, rad_point *on_pnt, rad_point *off_pnt);

void SetRadClipLines(vector *tp, vector *rp, vector *bp, vector *lp);

void ClipSurfaceElement(vector *surf_verts, rad_element *ep, vector *clip_verts, int nv);

void BuildLightmapUVs(int *room_list, int *face_list, int count, vector *lightmap_poly, int nv, int external);

// Returns number of verts in dest if face a can be safely combined with face b
// Returns 0 if not
int CombineLightFaces(vector *dest_verts, vector *averts, int nva, vector *norma, vector *bverts, int nvb,
                      vector *normb, int aroom = -1, int broom = -1);

// Given a roomnumber and a face, goes through the entire mine and checks to see
// if this face can share a lightmap with any other face
int TestLightAdjacency(int roomnum, int facenum, int external);

// Sets up radiosity surfaces for objects in a room
// Returns the number of new surfaces
int ComputeSurfacesForObjectsForSingleRoom(int surface_index, int roomnum);

// Computes the the mines UVs
// Faces can now share one lightmap, so this routine goes through and tries to
// combine as many faces as it can into one lightmap
void ComputeAllRoomLightmapUVs(int external);

// Computes lightmap uv sharing for a single room
void ComputeRoomLightmapUVs(room *rp);

// Sets up radiosity surfaces for objects in the mine
// Returns the number of new surfaces
int ComputeSurfacesForObjects(int surface_index, int terrain);

// Gets the total number of object faces that exist
int GetTotalObjectFaces(int terrain);

// Gets the total number of object faces that exist in a room
int GetTotalObjectFacesForSingleRoom(int roomnum);

void BuildObjectLightmapUVs(object *obj, int *sublist, int *facelist, int count, vector *lightmap_poly, int nv,
                            int lm_type);

// Goes through all objects and fills in the lightmap data for them
void AssignLightmapsToObjectSurfaces(int surface_index, int terrain);

void CombineObjectLightmapUVs(object *obj, int lmi_type);

// Frees memory for specular lighting
void CleanupSpecularLighting(int external);

// Sets up memory usage for specular lighting
void SetupSpecularLighting(int external);

// Calculates radiosity and sets lightmaps for indoor faces only
void DoRadiosityForCurrentRoom(room *rp);

extern rad_surface *Light_surfaces;
extern rad_surface *Terrain_light_surfaces;

extern uint8_t *TerrainLightSpeedup[];

extern int Square_surfaces;
extern int LightSpacing;
extern int BestFit;
extern float Ambient_red, Ambient_green, Ambient_blue;

#endif