From 3df90de6c2268bef91d3754f71c7404cfbeeac90 Mon Sep 17 00:00:00 2001
From: Patrick Mours <pmours@nvidia.com>
Date: Fri, 2 Oct 2020 17:40:28 +0200
Subject: Cycles: Add NanoVDB support for rendering volumes

NanoVDB is a platform-independent sparse volume data structure that makes it possible to
use OpenVDB volumes on the GPU. This patch uses it for volume rendering in Cycles,
replacing the previous usage of dense 3D textures.

Since it has a big impact on memory usage and performance and changes the OpenVDB
branch used for the rest of Blender as well, this is not enabled by default yet, which will
happen only after 2.82 was branched off. To enable it, build both dependencies and Blender
itself with the "WITH_NANOVDB" CMake option.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D8794
---
 intern/cycles/kernel/CMakeLists.txt | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

(limited to 'intern/cycles/kernel/CMakeLists.txt')

diff --git a/intern/cycles/kernel/CMakeLists.txt b/intern/cycles/kernel/CMakeLists.txt
index 6651dc2d59d..c9afbb48e7e 100644
--- a/intern/cycles/kernel/CMakeLists.txt
+++ b/intern/cycles/kernel/CMakeLists.txt
@@ -442,6 +442,12 @@ if(WITH_CYCLES_CUDA_BINARIES)
       set(cuda_flags ${cuda_flags} -D __KERNEL_DEBUG__)
     endif()
 
+    if(WITH_NANOVDB)
+      set(cuda_flags ${cuda_flags}
+        -D WITH_NANOVDB
+        -I "${NANOVDB_INCLUDE_DIR}")
+    endif()
+
     if(WITH_CYCLES_CUBIN_COMPILER)
       string(SUBSTRING ${arch} 3 -1 CUDA_ARCH)
 
@@ -527,8 +533,14 @@ if(WITH_CYCLES_DEVICE_OPTIX AND WITH_CYCLES_CUDA_BINARIES)
       set(cuda_flags ${cuda_flags}
         -D __KERNEL_DEBUG__)
     endif()
-    if(WITH_CYCLES_CUBIN_COMPILER)
 
+    if(WITH_NANOVDB)
+      set(cuda_flags ${cuda_flags}
+        -D WITH_NANOVDB
+        -I "${NANOVDB_INCLUDE_DIR}")
+    endif()
+
+    if(WITH_CYCLES_CUBIN_COMPILER)
       # Needed to find libnvrtc-builtins.so. Can't do it from inside
       # cycles_cubin_cc since the env variable is read before main()
       if(APPLE)
@@ -709,3 +721,17 @@ delayed_install(${CMAKE_CURRENT_SOURCE_DIR} "${SRC_SVM_HEADERS}" ${CYCLES_INSTAL
 delayed_install(${CMAKE_CURRENT_SOURCE_DIR} "${SRC_GEOM_HEADERS}" ${CYCLES_INSTALL_PATH}/source/kernel/geom)
 delayed_install(${CMAKE_CURRENT_SOURCE_DIR} "${SRC_UTIL_HEADERS}" ${CYCLES_INSTALL_PATH}/source/util)
 delayed_install(${CMAKE_CURRENT_SOURCE_DIR} "${SRC_SPLIT_HEADERS}" ${CYCLES_INSTALL_PATH}/source/kernel/split)
+
+
+if(WITH_NANOVDB)
+  set(SRC_NANOVDB_HEADERS
+    nanovdb/NanoVDB.h
+    nanovdb/CNanoVDB.h
+  )
+  set(SRC_NANOVDB_UTIL_HEADERS
+    nanovdb/util/CSampleFromVoxels.h
+    nanovdb/util/SampleFromVoxels.h
+  )
+  delayed_install(${NANOVDB_INCLUDE_DIR} "${SRC_NANOVDB_HEADERS}" ${CYCLES_INSTALL_PATH}/source/nanovdb)
+  delayed_install(${NANOVDB_INCLUDE_DIR} "${SRC_NANOVDB_UTIL_HEADERS}" ${CYCLES_INSTALL_PATH}/source/nanovdb/util)
+endif()
-- 
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