From 2c5531c0a521119a2f5c88b4ba2a67234c537d2b Mon Sep 17 00:00:00 2001
From: Stefan Werner <stefan.werner@tangent-animation.com>
Date: Wed, 7 Nov 2018 12:58:12 +0100
Subject: Cycles: Added Embree as BVH option for CPU renders.

Note that this is turned off by default and must be enabled at build time with the CMake WITH_CYCLES_EMBREE flag.
Embree must be built as a static library with ray masking turned on, the `make deps` scripts have been updated accordingly.
There, Embree is off by default too and must be enabled with the WITH_EMBREE flag.

Using Embree allows for much faster rendering of deformation motion blur while reducing the memory footprint.

TODO: GPU implementation, deduplication of data, leveraging more of Embrees features (e.g. tessellation cache).

Differential Revision: https://developer.blender.org/D3682
---
 build_files/cmake/Modules/FindEmbree.cmake | 108 +++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 build_files/cmake/Modules/FindEmbree.cmake

(limited to 'build_files/cmake/Modules')

diff --git a/build_files/cmake/Modules/FindEmbree.cmake b/build_files/cmake/Modules/FindEmbree.cmake
new file mode 100644
index 00000000000..d3ef8c6eb4c
--- /dev/null
+++ b/build_files/cmake/Modules/FindEmbree.cmake
@@ -0,0 +1,108 @@
+# - Find Embree library
+# Find the native Embree includes and library
+# This module defines
+#  EMBREE_INCLUDE_DIRS, where to find rtcore.h, Set when
+#                            EMBREE_INCLUDE_DIR is found.
+#  EMBREE_LIBRARIES, libraries to link against to use Embree.
+#  EMBREE_ROOT_DIR, The base directory to search for Embree.
+#                        This can also be an environment variable.
+#  EMBREEFOUND, If false, do not try to use Embree.
+#
+# also defined, but not for general use are
+#  EMBREE_LIBRARY, where to find the Embree library.
+
+#=============================================================================
+# Copyright 2018 Blender Foundation.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+
+# If EMBREE_ROOT_DIR was defined in the environment, use it.
+IF(NOT EMBREE_ROOT_DIR AND NOT $ENV{EMBREE_ROOT_DIR} STREQUAL "")
+  SET(EMBREE_ROOT_DIR $ENV{EMBREE_ROOT_DIR})
+ENDIF()
+
+SET(_embree_SEARCH_DIRS
+  ${EMBREE_ROOT_DIR}
+  /usr/local
+  /sw # Fink
+  /opt/local # DarwinPorts
+  /opt/embree
+  /opt/lib/embree
+)
+
+FIND_PATH(EMBREE_INCLUDE_DIR
+  NAMES
+    embree3/rtcore.h
+  HINTS
+    ${_embree_SEARCH_DIRS}
+  PATH_SUFFIXES
+    include
+)
+
+
+SET(_embree_FIND_COMPONENTS
+  embree_avx
+  embree_avx2
+  embree_sse42
+  embree3
+  lexers
+  math
+  simd
+  sys
+  tasking
+)
+
+SET(_embree_LIBRARIES)
+FOREACH(COMPONENT ${_embree_FIND_COMPONENTS})
+  STRING(TOUPPER ${COMPONENT} UPPERCOMPONENT)
+
+  FIND_LIBRARY(EMBREE_${UPPERCOMPONENT}_LIBRARY
+    NAMES
+      ${COMPONENT}
+    HINTS
+      ${_embree_SEARCH_DIRS}
+    PATH_SUFFIXES
+      lib64 lib
+    )
+  LIST(APPEND _embree_LIBRARIES "${EMBREE_${UPPERCOMPONENT}_LIBRARY}")
+ENDFOREACH()
+
+
+FIND_LIBRARY(EMBREE_LIBRARY
+  NAMES
+    libembree3
+  HINTS
+    ${_embree_SEARCH_DIRS}
+  PATH_SUFFIXES
+    lib64 lib
+)
+
+# handle the QUIETLY and REQUIRED arguments and set EMBREE_FOUND to TRUE if
+# all listed variables are TRUE
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(EMBREE DEFAULT_MSG
+    _embree_LIBRARIES EMBREE_INCLUDE_DIR)
+
+IF(EMBREE_FOUND)
+  SET(EMBREE_LIBRARIES ${_embree_LIBRARIES})
+  SET(EMBREE_INCLUDE_DIRS ${EMBREE_INCLUDE_DIR})
+ENDIF(EMBREE_FOUND)
+
+MARK_AS_ADVANCED(
+  EMBREE_INCLUDE_DIR
+)
+
+FOREACH(COMPONENT ${_embree_FIND_COMPONENTS})
+  STRING(TOUPPER ${COMPONENT} UPPERCOMPONENT)
+  MARK_AS_ADVANCED(EMBREE_${UPPERCOMPONENT}_LIBRARY)
+ENDFOREACH()
+
+UNSET(_embree_SEARCH_DIRS)
+UNSET(_embree_FIND_COMPONENTS)
+UNSET(_embree_LIBRARIES)
-- 
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