Objects: Eevee and workbench rendering of new Volume, Hair, PointCloud

Only the volume drawing part is really finished and exposed to the user. Hair
plugs into the existing hair rendering code and is fairly straightforward. The
pointcloud drawing is a hack using overlays rather than Eevee and workbench.

The most tricky part for volume rendering is the case where each volume grid
has a different transform, which requires an additional matrix in the shader
and non-trivial logic in Eevee volume drawing. In the common case were all the
transforms match we don't use the additional per-grid matrix in the shader.

Ref T73201, T68981

Differential Revision: https://developer.blender.org/D6955

1 files changed, 72 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_volume_render.h b/source/blender/blenkernel/BKE_volume_render.h
new file mode 100644
index 00000000000..72360f316a0
--- /dev/null
+++ b/source/blender/blenkernel/BKE_volume_render.h
@@ -0,0 +1,72 @@
+/*
+ * ***** 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.
+ *
+ * Contributor(s): Brecht Van Lommel.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __BKE_VOLUME_RENDER_H__
+#define __BKE_VOLUME_RENDER_H__
+
+/** \file BKE_volume_render.h
+ *  \ingroup bke
+ *  \brief Volume datablock rendering and viewport drawing utilities.
+ */
+
+#include "BLI_sys_types.h"
+
+#include "DNA_volume_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct Volume;
+struct VolumeGrid;
+
+/* Dense Voxels */
+
+bool BKE_volume_grid_dense_bounds(const struct Volume *volume,
+                                  struct VolumeGrid *volume_grid,
+                                  int64_t min[3],
+                                  int64_t max[3]);
+void BKE_volume_grid_dense_transform_matrix(const struct VolumeGrid *volume_grid,
+                                            const int64_t min[3],
+                                            const int64_t max[3],
+                                            float matrix[4][4]);
+void BKE_volume_grid_dense_voxels(const struct Volume *volume,
+                                  struct VolumeGrid *volume_grid,
+                                  const int64_t min[3],
+                                  const int64_t max[3],
+                                  float *voxels);
+
+/* Wireframe */
+
+typedef void (*BKE_volume_wireframe_cb)(
+    void *userdata, float (*verts)[3], int (*edges)[2], int totvert, int totedge);
+
+void BKE_volume_grid_wireframe(const struct Volume *volume,
+                               struct VolumeGrid *volume_grid,
+                               BKE_volume_wireframe_cb cb,
+                               void *cb_userdata);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif