Cleanup: Alembic, moved exporter code into separate directory

This moves most of the exporter-related code
from `source/blender/io/alembic/intern`
to   `source/blender/io/alembic/exporter`

This is to prepare the Alembic code for the switchover to using
`blender::io::AbstractHierarchyIterator`. When that happens, a few more
files will be added, and having things in a separate 'exporter'
directory makes things less cluttered.

Note that exporting consists of multiple steps (determine export
hierarchy, create Alembic archive, and then write data into it), which
is why the directory is called "exporter", but many of the files are
called "writer".

No functional changes.

1 files changed, 122 insertions, 0 deletions

diff --git a/source/blender/io/alembic/exporter/abc_writer_points.cc b/source/blender/io/alembic/exporter/abc_writer_points.cc
new file mode 100644
index 00000000000..27f51586f47
--- /dev/null
+++ b/source/blender/io/alembic/exporter/abc_writer_points.cc
@@ -0,0 +1,122 @@
+/*
+ * 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) 2016 Kévin Dietrich.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup balembic
+ */
+
+#include "abc_writer_points.h"
+#include "abc_writer_mesh.h"
+#include "abc_writer_transform.h"
+#include "intern/abc_util.h"
+
+#include "DNA_object_types.h"
+#include "DNA_particle_types.h"
+
+#include "BKE_lattice.h"
+#include "BKE_particle.h"
+
+#include "BLI_math.h"
+
+#include "DEG_depsgraph_query.h"
+
+using Alembic::AbcGeom::kVertexScope;
+using Alembic::AbcGeom::OPoints;
+using Alembic::AbcGeom::OPointsSchema;
+
+/* ************************************************************************** */
+
+AbcPointsWriter::AbcPointsWriter(Object *ob,
+                                 AbcTransformWriter *parent,
+                                 uint32_t time_sampling,
+                                 ExportSettings &settings,
+                                 ParticleSystem *psys)
+    : AbcObjectWriter(ob, time_sampling, settings, parent)
+{
+  m_psys = psys;
+
+  std::string psys_name = get_valid_abc_name(psys->name);
+  OPoints points(parent->alembicXform(), psys_name, m_time_sampling);
+  m_schema = points.getSchema();
+}
+
+void AbcPointsWriter::do_write()
+{
+  if (!m_psys) {
+    return;
+  }
+
+  std::vector<Imath::V3f> points;
+  std::vector<Imath::V3f> velocities;
+  std::vector<float> widths;
+  std::vector<uint64_t> ids;
+
+  ParticleKey state;
+
+  ParticleSimulationData sim;
+  sim.depsgraph = m_settings.depsgraph;
+  sim.scene = m_settings.scene;
+  sim.ob = m_object;
+  sim.psys = m_psys;
+
+  m_psys->lattice_deform_data = psys_create_lattice_deform_data(&sim);
+
+  uint64_t index = 0;
+  for (int p = 0; p < m_psys->totpart; p++) {
+    float pos[3], vel[3];
+
+    if (m_psys->particles[p].flag & (PARS_NO_DISP | PARS_UNEXIST)) {
+      continue;
+    }
+
+    state.time = DEG_get_ctime(m_settings.depsgraph);
+
+    if (psys_get_particle_state(&sim, p, &state, 0) == 0) {
+      continue;
+    }
+
+    /* location */
+    mul_v3_m4v3(pos, m_object->imat, state.co);
+
+    /* velocity */
+    sub_v3_v3v3(vel, state.co, m_psys->particles[p].prev_state.co);
+
+    /* Convert Z-up to Y-up. */
+    points.push_back(Imath::V3f(pos[0], pos[2], -pos[1]));
+    velocities.push_back(Imath::V3f(vel[0], vel[2], -vel[1]));
+    widths.push_back(m_psys->particles[p].size);
+    ids.push_back(index++);
+  }
+
+  if (m_psys->lattice_deform_data) {
+    BKE_lattice_deform_data_destroy(m_psys->lattice_deform_data);
+    m_psys->lattice_deform_data = NULL;
+  }
+
+  Alembic::Abc::P3fArraySample psample(points);
+  Alembic::Abc::UInt64ArraySample idsample(ids);
+  Alembic::Abc::V3fArraySample vsample(velocities);
+  Alembic::Abc::FloatArraySample wsample_array(widths);
+  Alembic::AbcGeom::OFloatGeomParam::Sample wsample(wsample_array, kVertexScope);
+
+  m_sample = OPointsSchema::Sample(psample, idsample, vsample, wsample);
+  m_sample.setSelfBounds(bounds());
+
+  m_schema.set(m_sample);
+}