diff options
Diffstat (limited to 'source/blender/blenlib/intern/uvproject.c')
| -rw-r--r-- | source/blender/blenlib/intern/uvproject.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/source/blender/blenlib/intern/uvproject.c b/source/blender/blenlib/intern/uvproject.c new file mode 100644 index 00000000000..cc115d52928 --- /dev/null +++ b/source/blender/blenlib/intern/uvproject.c @@ -0,0 +1,191 @@ +/** + * $Id$ + * + * ***** 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 ***** + */ + +#include <math.h> + +#include "MEM_guardedalloc.h" + +#include "DNA_camera_types.h" +#include "DNA_object_types.h" + +#include "BLI_math.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]) / (M_PI * 2.0); /* 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]= {pv4[0], pv4[2]}; /* 2D position from the camera */ + target[0]= angle * (M_PI / uci->camangle); + target[1]= pv4[1] / (len_v2(vec2d) * uci->camsize); + } + } + 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(fabs(pv4[3]) > 0.00001) { /* avoid division by zero */ + target[0] = winx/2.0 + (winx/2.0) * pv4[0] / pv4[3]; + target[1] = winy/2.0 + (winy/2.0) * pv4[1] / pv4[3]; + } + else { + /* scaling is lost but give a valid result */ + target[0] = winx/2.0 + (winx/2.0) * pv4[0]; + target[1] = winy/2.0 + (winy/2.0) * pv4[1]; + } + + /* v3d->persmat seems to do this funky scaling */ + if(winx > winy) { + y= (winx - winy)/2.0; + winy = winx; + } + else { + x= (winy - winx)/2.0; + 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; + + if (invert_m4_m4(uci.caminv, ob->obmat)) { + 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.shifty = 0.5f - camera->shifty; + + 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; +} |