Add Chromium-only Blender WebEngine parity work

blender-5.2.0/source/blender/blenkernel/intern/uvproject.cc

@@ -0,0 +1,203 @@
+/* SPDX-FileCopyrightText: 2023 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup bke
+ */
+
+#include <cmath>
+
+#include "MEM_guardedalloc.h"
+
+#include "DNA_camera_types.h"
+#include "DNA_object_types.h"
+
+#include "BLI_math_matrix.h"
+#include "BLI_math_rotation.h"
+#include "BLI_math_vector.h"
+
+#include "BKE_uvproject.h"
+
+namespace blender {
+
+struct ProjCameraInfo {
+  float camangle;
+  float camsize;
+  float xasp, yasp;
+  float shiftx, shifty;
+  float rotmat[4][4];
+  float caminv[4][4];
+  bool do_persp, do_pano, do_rotmat;
+};
+
+void BKE_uvproject_from_camera(float target[2], const float source[3], const ProjCameraInfo *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 == false) {
+      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 == false) {
+      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;
+}
+
+void BKE_uvproject_from_view(float target[2],
+                             const float source[3],
+                             const float persmat[4][4],
+                             const float rotmat[4][4],
+                             float winx,
+                             float winy)
+{
+  float pv4[4], x = 0.0, y = 0.0;
+
+  copy_v3_v3(pv4, source);
+  pv4[3] = 1.0;
+
+  /* rotmat is the object matrix in this case */
+  mul_m4_v4(rotmat, pv4);
+
+  /* almost ED_view3d_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;
+}
+
+ProjCameraInfo *BKE_uvproject_camera_info(const Object *ob,
+                                          const float rotmat[4][4],
+                                          float winx,
+                                          float winy)
+{
+  ProjCameraInfo uci;
+  const Camera *camera = id_cast<Camera *>(ob->data);
+
+  uci.do_pano = (camera->type == CAM_PANO);
+  uci.do_persp = ELEM(camera->type, CAM_PERSP, CAM_CUSTOM);
+
+  uci.camangle = focallength_to_fov(camera->lens, camera->sensor_x) / 2.0f;
+  uci.camsize = uci.do_persp ? tanf(uci.camangle) : camera->ortho_scale;
+
+  /* account for scaled cameras */
+  copy_m4_m4(uci.caminv, ob->object_to_world().ptr());
+  normalize_m4(uci.caminv);
+
+  if (invert_m4(uci.caminv)) {
+    ProjCameraInfo *uci_pt;
+
+    /* normal projection */
+    if (rotmat) {
+      copy_m4_m4(uci.rotmat, rotmat);
+      uci.do_rotmat = true;
+    }
+    else {
+      uci.do_rotmat = false;
+    }
+
+    /* 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_new_uninitialized<ProjCameraInfo>(__func__);
+    *uci_pt = uci;
+    return uci_pt;
+  }
+
+  return nullptr;
+}
+
+void BKE_uvproject_camera_info_free(ProjCameraInfo *uci)
+{
+  MEM_delete(uci);
+}
+
+void BKE_uvproject_from_view_ortho(float target[2],
+                                   const float source[3],
+                                   const float rotmat[4][4])
+{
+  float pv[3];
+
+  mul_v3_m4v3(pv, rotmat, source);
+
+  /* ortho projection */
+  target[0] = -pv[0];
+  target[1] = pv[2];
+}
+
+void BKE_uvproject_camera_info_scale(ProjCameraInfo *uci, float scale_x, float scale_y)
+{
+  uci->xasp *= scale_x;
+  uci->yasp *= scale_y;
+}
+
+}  // namespace blender