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/*
* $Id$
*
* ***** 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.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/blenlib/intern/uvproject.c
* \ingroup bli
*/
#include <math.h>
#include "MEM_guardedalloc.h"
#include "DNA_camera_types.h"
#include "DNA_object_types.h"
#include "BLI_math.h"
#include "BLI_uvproject.h"
typedef struct UvCameraInfo {
float camangle;
float camsize;
float xasp, yasp;
float shiftx, shifty;
float rotmat[4][4];
float caminv[4][4];
short do_persp, do_pano, do_rotmat;
} UvCameraInfo;
void project_from_camera(float target[2], float source[3], UvCameraInfo *uci)
{
float pv4[4];
copy_v3_v3(pv4, source);
pv4[3]= 1.0;
/* rotmat is the object matrix in this case */
if(uci->do_rotmat)
mul_m4_v4(uci->rotmat, pv4);
/* caminv is the inverse camera matrix */
mul_m4_v4(uci->caminv, pv4);
if(uci->do_pano) {
float angle= atan2f(pv4[0], -pv4[2]) / ((float)M_PI * 2.0f); /* angle around the camera */
if (uci->do_persp==0) {
target[0]= angle; /* no correct method here, just map to 0-1 */
target[1]= pv4[1] / uci->camsize;
}
else {
float vec2d[2]; /* 2D position from the camera */
vec2d[0]= pv4[0];
vec2d[1]= pv4[2];
target[0]= angle * ((float)M_PI / uci->camangle);
target[1]= pv4[1] / (len_v2(vec2d) * (uci->camsize * 2.0f));
}
}
else {
if (pv4[2]==0.0f) pv4[2]= 0.00001f; /* don't allow div by 0 */
if (uci->do_persp==0) {
target[0]= (pv4[0]/uci->camsize);
target[1]= (pv4[1]/uci->camsize);
}
else {
target[0]= (-pv4[0]*((1.0f/uci->camsize)/pv4[2])) / 2.0f;
target[1]= (-pv4[1]*((1.0f/uci->camsize)/pv4[2])) / 2.0f;
}
}
target[0] *= uci->xasp;
target[1] *= uci->yasp;
/* adds camera shift + 0.5 */
target[0] += uci->shiftx;
target[1] += uci->shifty;
}
/* could rv3d->persmat */
void project_from_view(float target[2], float source[3], float persmat[4][4], float rotmat[4][4], float winx, float winy)
{
float pv[3], pv4[4], x= 0.0, y= 0.0;
mul_v3_m4v3(pv, rotmat, source);
copy_v3_v3(pv4, source);
pv4[3]= 1.0;
/* rotmat is the object matrix in this case */
mul_m4_v4(rotmat, pv4);
/* almost project_short */
mul_m4_v4(persmat, pv4);
if(fabsf(pv4[3]) > 0.00001f) { /* avoid division by zero */
target[0] = winx/2.0f + (winx/2.0f) * pv4[0] / pv4[3];
target[1] = winy/2.0f + (winy/2.0f) * pv4[1] / pv4[3];
}
else {
/* scaling is lost but give a valid result */
target[0] = winx/2.0f + (winx/2.0f) * pv4[0];
target[1] = winy/2.0f + (winy/2.0f) * pv4[1];
}
/* v3d->persmat seems to do this funky scaling */
if(winx > winy) {
y= (winx - winy)/2.0f;
winy = winx;
}
else {
x= (winy - winx)/2.0f;
winx = winy;
}
target[0]= (x + target[0]) / winx;
target[1]= (y + target[1]) / winy;
}
/* 'rotmat' can be obedit->obmat when uv project is used.
* 'winx' and 'winy' can be from scene->r.xsch/ysch */
UvCameraInfo *project_camera_info(Object *ob, float (*rotmat)[4], float winx, float winy)
{
UvCameraInfo uci;
Camera *camera= ob->data;
uci.do_pano = (camera->flag & CAM_PANORAMA);
uci.do_persp = (camera->type==CAM_PERSP);
uci.camangle= lens_to_angle(camera->lens) / 2.0f;
uci.camsize= uci.do_persp ? tanf(uci.camangle) : camera->ortho_scale;
/* account for scaled cameras */
copy_m4_m4(uci.caminv, ob->obmat);
normalize_m4(uci.caminv);
if (invert_m4(uci.caminv)) {
UvCameraInfo *uci_pt;
/* normal projection */
if(rotmat) {
copy_m4_m4(uci.rotmat, rotmat);
uci.do_rotmat= 1;
}
else {
uci.do_rotmat= 0;
}
/* also make aspect ratio adjustment factors */
if (winx > winy) {
uci.xasp= 1.0f;
uci.yasp= winx / winy;
}
else {
uci.xasp= winy / winx;
uci.yasp= 1.0f;
}
/* include 0.5f here to move the UVs into the center */
uci.shiftx = 0.5f - (camera->shiftx * uci.xasp);
uci.shifty = 0.5f - (camera->shifty * uci.yasp);
uci_pt= MEM_mallocN(sizeof(UvCameraInfo), "UvCameraInfo");
*uci_pt= uci;
return uci_pt;
}
return NULL;
}
void project_from_view_ortho(float target[2], float source[3], float rotmat[4][4])
{
float pv[3];
mul_v3_m4v3(pv, rotmat, source);
/* ortho projection */
target[0] = -pv[0];
target[1] = pv[2];
}
void project_camera_info_scale(UvCameraInfo *uci, float scale_x, float scale_y)
{
uci->xasp *= scale_x;
uci->yasp *= scale_y;
}
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