/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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) 2005 Blender Foundation.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): Ben Batt
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/modifiers/intern/MOD_util.c
 *  \ingroup modifiers
 */


#include <string.h>

#include "DNA_lattice_types.h"
#include "DNA_modifier_types.h"
#include "DNA_object_types.h"
#include "DNA_curve_types.h"
#include "DNA_meshdata_types.h"

#include "BLI_utildefines.h"
#include "BLI_math_vector.h"
#include "BLI_math_matrix.h"

#include "BKE_cdderivedmesh.h"
#include "BKE_deform.h"
#include "BKE_lattice.h"
#include "BKE_mesh.h"
#include "BKE_displist.h"

#include "BKE_modifier.h"

#include "MOD_util.h"
#include "MOD_modifiertypes.h"

#include "MEM_guardedalloc.h"

#include "RE_shader_ext.h"

void get_texture_value(Tex *texture, float *tex_co, TexResult *texres)
{
	int result_type;

	/* no node textures for now */
	result_type = multitex_ext_safe(texture, tex_co, texres);

	/* if the texture gave an RGB value, we assume it didn't give a valid
	 * intensity, so calculate one (formula from do_material_tex).
	 * if the texture didn't give an RGB value, copy the intensity across
	 */
	if(result_type & TEX_RGB)
		texres->tin = (0.35f * texres->tr + 0.45f * texres->tg
				+ 0.2f * texres->tb);
	else
		texres->tr = texres->tg = texres->tb = texres->tin;
}

void get_texture_coords(MappingInfoModifierData *dmd, Object *ob,
                        DerivedMesh *dm,
                        float (*co)[3], float (*texco)[3],
                        int numVerts)
{
	int i;
	int texmapping = dmd->texmapping;
	float mapob_imat[4][4];

	if(texmapping == MOD_DISP_MAP_OBJECT) {
		if(dmd->map_object)
			invert_m4_m4(mapob_imat, dmd->map_object->obmat);
		else /* if there is no map object, default to local */
			texmapping = MOD_DISP_MAP_LOCAL;
	}

	/* UVs need special handling, since they come from faces */
	if(texmapping == MOD_DISP_MAP_UV) {
		if(CustomData_has_layer(&dm->loopData, CD_MLOOPUV)) {
			MPoly *mpoly = dm->getPolyArray(dm);
			MPoly *mp;
			MLoop *mloop = dm->getLoopArray(dm);
			char *done = MEM_callocN(sizeof(*done) * numVerts,
			                         "get_texture_coords done");
			int numPolys = dm->getNumPolys(dm);
			char uvname[MAX_CUSTOMDATA_LAYER_NAME];
			MLoopUV *mloop_uv;

			CustomData_validate_layer_name(&dm->loopData, CD_MLOOPUV, dmd->uvlayer_name, uvname);
			mloop_uv = CustomData_get_layer_named(&dm->loopData, CD_MLOOPUV, uvname);

			/* verts are given the UV from the first face that uses them */
			for(i = 0, mp = mpoly; i < numPolys; ++i, ++mp) {
				unsigned int fidx= mp->totloop - 1;

				do {
					unsigned int lidx= mp->loopstart + fidx;
					unsigned int vidx= mloop[lidx].v;

					if (done[vidx] == 0) {
						/* remap UVs from [0, 1] to [-1, 1] */
						texco[vidx][0] = (mloop_uv[lidx].uv[0] * 2.0f) - 1.0f;
						texco[vidx][1] = (mloop_uv[lidx].uv[1] * 2.0f) - 1.0f;
						done[vidx] = 1;
					}

				} while (fidx--);
			}

			MEM_freeN(done);
			return;
		} else /* if there are no UVs, default to local */
			texmapping = MOD_DISP_MAP_LOCAL;
	}

	for(i = 0; i < numVerts; ++i, ++co, ++texco) {
		switch(texmapping) {
		case MOD_DISP_MAP_LOCAL:
			copy_v3_v3(*texco, *co);
			break;
		case MOD_DISP_MAP_GLOBAL:
			mul_v3_m4v3(*texco, ob->obmat, *co);
			break;
		case MOD_DISP_MAP_OBJECT:
			mul_v3_m4v3(*texco, ob->obmat, *co);
			mul_m4_v3(mapob_imat, *texco);
			break;
		}
	}
}

void modifier_vgroup_cache(ModifierData *md, float (*vertexCos)[3])
{
	while((md=md->next) && md->type==eModifierType_Armature) {
		ArmatureModifierData *amd = (ArmatureModifierData*) md;
		if(amd->multi && amd->prevCos==NULL)
			amd->prevCos= MEM_dupallocN(vertexCos);
		else
			break;
	}
	/* lattice/mesh modifier too */
}

/* returns a cdderivedmesh if dm == NULL or is another type of derivedmesh */
DerivedMesh *get_cddm(Object *ob, struct BMEditMesh *em, DerivedMesh *dm, float (*vertexCos)[3])
{
	if(dm && dm->type == DM_TYPE_CDDM)
		return dm;

	if(!dm) {
		dm= get_dm(ob, em, dm, vertexCos, 0);
	}
	else {
		dm= CDDM_copy(dm);
		CDDM_apply_vert_coords(dm, vertexCos);
	}

	if(dm)
		CDDM_calc_normals(dm);
	
	return dm;
}

/* returns a derived mesh if dm == NULL, for deforming modifiers that need it */
DerivedMesh *get_dm(Object *ob, struct BMEditMesh *em, DerivedMesh *dm, float (*vertexCos)[3], int orco)
{
	if(dm)
		return dm;

	if(ob->type==OB_MESH) {
		if(em) dm= CDDM_from_BMEditMesh(em, ob->data, FALSE, FALSE);
		else dm = CDDM_from_mesh((struct Mesh *)(ob->data), ob);

		if(vertexCos) {
			CDDM_apply_vert_coords(dm, vertexCos);
			//CDDM_calc_normals(dm);
		}
		
		if(orco)
			DM_add_vert_layer(dm, CD_ORCO, CD_ASSIGN, get_mesh_orco_verts(ob));
	}
	else if(ELEM3(ob->type,OB_FONT,OB_CURVE,OB_SURF)) {
		dm= CDDM_from_curve(ob);
	}

	return dm;
}

void modifier_get_vgroup(Object *ob, DerivedMesh *dm, const char *name, MDeformVert **dvert, int *defgrp_index)
{
	*defgrp_index = defgroup_name_index(ob, name);
	*dvert = NULL;

	if(*defgrp_index >= 0) {
		if(ob->type == OB_LATTICE)
			*dvert = lattice_get_deform_verts(ob);
		else if(dm)
			*dvert = dm->getVertDataArray(dm, CD_MDEFORMVERT);
	}
}

/* only called by BKE_modifier.h/modifier.c */
void modifier_type_init(ModifierTypeInfo *types[])
{
#define INIT_TYPE(typeName) (types[eModifierType_##typeName] = &modifierType_##typeName)
	INIT_TYPE(None);
	INIT_TYPE(Curve);
	INIT_TYPE(Lattice);
	INIT_TYPE(Subsurf);
	INIT_TYPE(Build);
	INIT_TYPE(Array);
	INIT_TYPE(Mirror);
	INIT_TYPE(EdgeSplit);
	INIT_TYPE(Bevel);
	INIT_TYPE(Displace);
	INIT_TYPE(UVProject);
	INIT_TYPE(Decimate);
	INIT_TYPE(Smooth);
	INIT_TYPE(Cast);
	INIT_TYPE(Wave);
	INIT_TYPE(Armature);
	INIT_TYPE(Hook);
	INIT_TYPE(Softbody);
	INIT_TYPE(Cloth);
	INIT_TYPE(Collision);
	INIT_TYPE(Boolean);
	INIT_TYPE(MeshDeform);
	INIT_TYPE(Ocean);
	INIT_TYPE(ParticleSystem);
	INIT_TYPE(ParticleInstance);
	INIT_TYPE(Explode);
	INIT_TYPE(Shrinkwrap);
	INIT_TYPE(Fluidsim);
	INIT_TYPE(Mask);
	INIT_TYPE(SimpleDeform);
	INIT_TYPE(Multires);
	INIT_TYPE(Surface);
	INIT_TYPE(Smoke);
	INIT_TYPE(ShapeKey);
	INIT_TYPE(Solidify);
	INIT_TYPE(Screw);
	INIT_TYPE(Warp);
	INIT_TYPE(WeightVGEdit);
	INIT_TYPE(WeightVGMix);
	INIT_TYPE(WeightVGProximity);
	INIT_TYPE(DynamicPaint);
	INIT_TYPE(Remesh);
#undef INIT_TYPE
}