MOD_util.c

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/*
 * ***** 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 *****
 */

#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->faceData, CD_MTFACE)) {
            MFace *mface = dm->getFaceArray(dm);
            MFace *mf;
            char *done = MEM_callocN(sizeof(*done) * numVerts,
                                     "get_texture_coords done");
            int numFaces = dm->getNumFaces(dm);
            char uvname[MAX_CUSTOMDATA_LAYER_NAME];
            MTFace *tf;

            CustomData_validate_layer_name(&dm->faceData, CD_MTFACE, dmd->uvlayer_name, uvname);
            tf = CustomData_get_layer_named(&dm->faceData, CD_MTFACE, uvname);

            /* verts are given the UV from the first face that uses them */
            for(i = 0, mf = mface; i < numFaces; ++i, ++mf, ++tf) {
                unsigned int fidx= mf->v4 ? 3:2;

                do {
                    unsigned int vidx = *(&mf->v1 + fidx);

                    if (done[vidx] == 0) {
                        /* remap UVs from [0, 1] to [-1, 1] */
                        texco[vidx][0] = (tf->uv[fidx][0] * 2.0f) - 1.0f;
                        texco[vidx][1] = (tf->uv[fidx][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 EditMesh *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 EditMesh *em, DerivedMesh *dm, float (*vertexCos)[3], int orco)
{
    if(dm)
        return dm;

    if(ob->type==OB_MESH) {
        if(em) dm= CDDM_from_editmesh(em, ob->data);
        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
}