blender-archive/source/blender/modifiers/intern/MOD_uvproject.c

/*
 * 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 by the Blender Foundation.
 * All rights reserved.
 */

/** \file
 * \ingroup modifiers
 */


/* UV Project modifier: Generates UVs projected from an object */

#include "BLI_utildefines.h"

#include "BLI_math.h"
#include "BLI_uvproject.h"

#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_camera_types.h"
#include "DNA_object_types.h"

#include "BKE_camera.h"
#include "BKE_library_query.h"
#include "BKE_material.h"
#include "BKE_mesh.h"

#include "MOD_modifiertypes.h"

#include "MEM_guardedalloc.h"

#include "DEG_depsgraph.h"
#include "DEG_depsgraph_build.h"
#include "DEG_depsgraph_query.h"

static void initData(ModifierData *md)
{
	UVProjectModifierData *umd = (UVProjectModifierData *) md;


	umd->num_projectors = 1;
	umd->aspectx = umd->aspecty = 1.0f;
	umd->scalex = umd->scaley = 1.0f;
}

static void requiredDataMask(Object *UNUSED(ob), ModifierData *UNUSED(md), CustomData_MeshMasks *r_cddata_masks)
{
	/* ask for UV coordinates */
	r_cddata_masks->lmask |= CD_MLOOPUV;
}

static void foreachObjectLink(
        ModifierData *md, Object *ob,
        ObjectWalkFunc walk, void *userData)
{
	UVProjectModifierData *umd = (UVProjectModifierData *) md;
	int i;

	for (i = 0; i < MOD_UVPROJECT_MAXPROJECTORS; ++i)
		walk(userData, ob, &umd->projectors[i], IDWALK_CB_NOP);
}

static void foreachIDLink(
        ModifierData *md, Object *ob,
        IDWalkFunc walk, void *userData)
{
#if 0
	UVProjectModifierData *umd = (UVProjectModifierData *) md;
#endif

	foreachObjectLink(md, ob, (ObjectWalkFunc)walk, userData);
}

static void updateDepsgraph(ModifierData *md, const ModifierUpdateDepsgraphContext *ctx)
{
	UVProjectModifierData *umd = (UVProjectModifierData *)md;
	bool do_add_own_transform = false;
	for (int i = 0; i < umd->num_projectors; ++i) {
		if (umd->projectors[i] != NULL) {
			DEG_add_object_relation(ctx->node, umd->projectors[i], DEG_OB_COMP_TRANSFORM, "UV Project Modifier");
			do_add_own_transform = true;
		}
	}
	if (do_add_own_transform) {
		DEG_add_modifier_to_transform_relation(ctx->node, "UV Project Modifier");
	}
}

typedef struct Projector {
	Object *ob;             /* object this projector is derived from */
	float projmat[4][4];    /* projection matrix */
	float normal[3];        /* projector normal in world space */
	void *uci;              /* optional uv-project info (panorama projection) */
} Projector;

static Mesh *uvprojectModifier_do(
        UVProjectModifierData *umd,
        const ModifierEvalContext *UNUSED(ctx),
        Object *ob, Mesh *mesh)
{
	float (*coords)[3], (*co)[3];
	MLoopUV *mloop_uv;
	int i, numVerts, numPolys, numLoops;
	MPoly *mpoly, *mp;
	MLoop *mloop;
	Projector projectors[MOD_UVPROJECT_MAXPROJECTORS];
	int num_projectors = 0;
	char uvname[MAX_CUSTOMDATA_LAYER_NAME];
	float aspx = umd->aspectx ? umd->aspectx : 1.0f;
	float aspy = umd->aspecty ? umd->aspecty : 1.0f;
	float scax = umd->scalex ? umd->scalex : 1.0f;
	float scay = umd->scaley ? umd->scaley : 1.0f;
	int free_uci = 0;

	for (i = 0; i < umd->num_projectors; ++i) {
		if (umd->projectors[i] != NULL) {
			projectors[num_projectors++].ob = umd->projectors[i];
		}
	}

	if (num_projectors == 0)
		return mesh;

	/* make sure there are UV Maps available */

	if (!CustomData_has_layer(&mesh->ldata, CD_MLOOPUV)) return mesh;

	/* make sure we're using an existing layer */
	CustomData_validate_layer_name(&mesh->ldata, CD_MLOOPUV, umd->uvlayer_name, uvname);

	/* calculate a projection matrix and normal for each projector */
	for (i = 0; i < num_projectors; ++i) {
		float tmpmat[4][4];
		float offsetmat[4][4];
		Camera *cam = NULL;
		/* calculate projection matrix */
		invert_m4_m4(projectors[i].projmat, projectors[i].ob->obmat);

		projectors[i].uci = NULL;

		if (projectors[i].ob->type == OB_CAMERA) {
			cam = (Camera *)projectors[i].ob->data;
			if (cam->type == CAM_PANO) {
				projectors[i].uci = BLI_uvproject_camera_info(projectors[i].ob, NULL, aspx, aspy);
				BLI_uvproject_camera_info_scale(projectors[i].uci, scax, scay);
				free_uci = 1;
			}
			else {
				CameraParams params;

				/* setup parameters */
				BKE_camera_params_init(&params);
				BKE_camera_params_from_object(&params, projectors[i].ob);

				/* compute matrix, viewplane, .. */
				BKE_camera_params_compute_viewplane(&params, 1, 1, aspx, aspy);

				/* scale the view-plane */
				params.viewplane.xmin *= scax;
				params.viewplane.xmax *= scax;
				params.viewplane.ymin *= scay;
				params.viewplane.ymax *= scay;

				BKE_camera_params_compute_matrix(&params);
				mul_m4_m4m4(tmpmat, params.winmat, projectors[i].projmat);
			}
		}
		else {
			copy_m4_m4(tmpmat, projectors[i].projmat);
		}

		unit_m4(offsetmat);
		mul_mat3_m4_fl(offsetmat, 0.5);
		offsetmat[3][0] = offsetmat[3][1] = offsetmat[3][2] = 0.5;

		mul_m4_m4m4(projectors[i].projmat, offsetmat, tmpmat);

		/* calculate worldspace projector normal (for best projector test) */
		projectors[i].normal[0] = 0;
		projectors[i].normal[1] = 0;
		projectors[i].normal[2] = 1;
		mul_mat3_m4_v3(projectors[i].ob->obmat, projectors[i].normal);
	}

	numPolys = mesh->totpoly;
	numLoops = mesh->totloop;

	/* make sure we are not modifying the original UV map */
	mloop_uv = CustomData_duplicate_referenced_layer_named(&mesh->ldata,
	                                                       CD_MLOOPUV, uvname, numLoops);

	coords = BKE_mesh_vertexCos_get(mesh, &numVerts);

	/* convert coords to world space */
	for (i = 0, co = coords; i < numVerts; ++i, ++co)
		mul_m4_v3(ob->obmat, *co);

	/* if only one projector, project coords to UVs */
	if (num_projectors == 1 && projectors[0].uci == NULL)
		for (i = 0, co = coords; i < numVerts; ++i, ++co)
			mul_project_m4_v3(projectors[0].projmat, *co);

	mpoly = mesh->mpoly;
	mloop = mesh->mloop;

	/* apply coords as UVs */
	for (i = 0, mp = mpoly; i < numPolys; ++i, ++mp) {
		if (num_projectors == 1) {
			if (projectors[0].uci) {
				unsigned int fidx = mp->totloop - 1;
				do {
					unsigned int lidx = mp->loopstart + fidx;
					unsigned int vidx = mloop[lidx].v;
					BLI_uvproject_from_camera(mloop_uv[lidx].uv, coords[vidx], projectors[0].uci);
				} while (fidx--);
			}
			else {
				/* apply transformed coords as UVs */
				unsigned int fidx = mp->totloop - 1;
				do {
					unsigned int lidx = mp->loopstart + fidx;
					unsigned int vidx = mloop[lidx].v;
					copy_v2_v2(mloop_uv[lidx].uv, coords[vidx]);
				} while (fidx--);
			}
		}
		else {
			/* multiple projectors, select the closest to face normal direction */
			float face_no[3];
			int j;
			Projector *best_projector;
			float best_dot;

			/* get the untransformed face normal */
			BKE_mesh_calc_poly_normal_coords(mp, mloop + mp->loopstart, (const float (*)[3])coords, face_no);

			/* find the projector which the face points at most directly
			 * (projector normal with largest dot product is best)
			 */
			best_dot = dot_v3v3(projectors[0].normal, face_no);
			best_projector = &projectors[0];

			for (j = 1; j < num_projectors; ++j) {
				float tmp_dot = dot_v3v3(projectors[j].normal, face_no);
				if (tmp_dot > best_dot) {
					best_dot = tmp_dot;
					best_projector = &projectors[j];
				}
			}

			if (best_projector->uci) {
				unsigned int fidx = mp->totloop - 1;
				do {
					unsigned int lidx = mp->loopstart + fidx;
					unsigned int vidx = mloop[lidx].v;
					BLI_uvproject_from_camera(mloop_uv[lidx].uv, coords[vidx], best_projector->uci);
				} while (fidx--);
			}
			else {
				unsigned int fidx = mp->totloop - 1;
				do {
					unsigned int lidx = mp->loopstart + fidx;
					unsigned int vidx = mloop[lidx].v;
					mul_v2_project_m4_v3(mloop_uv[lidx].uv, best_projector->projmat, coords[vidx]);
				} while (fidx--);
			}
		}
	}

	MEM_freeN(coords);

	if (free_uci) {
		int j;
		for (j = 0; j < num_projectors; ++j) {
			if (projectors[j].uci) {
				MEM_freeN(projectors[j].uci);
			}
		}
	}

	/* Mark tessellated CD layers as dirty. */
	mesh->runtime.cd_dirty_vert |= CD_MASK_TESSLOOPNORMAL;

	return mesh;
}

static Mesh *applyModifier(
        ModifierData *md, const ModifierEvalContext *ctx,
        Mesh *mesh)
{
	Mesh *result;
	UVProjectModifierData *umd = (UVProjectModifierData *) md;

	result = uvprojectModifier_do(umd, ctx, ctx->object, mesh);

	return result;
}


ModifierTypeInfo modifierType_UVProject = {
	/* name */              "UVProject",
	/* structName */        "UVProjectModifierData",
	/* structSize */        sizeof(UVProjectModifierData),
	/* type */              eModifierTypeType_NonGeometrical,
	/* flags */             eModifierTypeFlag_AcceptsMesh |
	                        eModifierTypeFlag_SupportsMapping |
	                        eModifierTypeFlag_SupportsEditmode |
	                        eModifierTypeFlag_EnableInEditmode,

	/* copyData */          modifier_copyData_generic,

	/* deformVerts */       NULL,
	/* deformMatrices */    NULL,
	/* deformVertsEM */     NULL,
	/* deformMatricesEM */  NULL,
	/* applyModifier */     applyModifier,

	/* initData */          initData,
	/* requiredDataMask */  requiredDataMask,
	/* freeData */          NULL,
	/* isDisabled */        NULL,
	/* updateDepsgraph */   updateDepsgraph,
	/* dependsOnTime */     NULL,
	/* dependsOnNormals */	NULL,
	/* foreachObjectLink */ foreachObjectLink,
	/* foreachIDLink */     foreachIDLink,
	/* foreachTexLink */    NULL,
	/* freeRuntimeData */   NULL,
};