From 35275bf8ef4aded68d6bda4a87e2b1570318edc5 Mon Sep 17 00:00:00 2001
From: Dylan Baker <baker.dylan.c@gmail.com>
Date: Wed, 16 Mar 2016 15:02:12 -0700
Subject: [PATCH] cmake: Add FindASSIMP.cmake

This find module addresses the problem raised by debian (non-sid) and
Ubuntu (and possibly other distributions) that don't install the cmake
config files.

This FindModule will try to use a config file, but will fall back to
using find_library if it can't.

It will unset any variables provided by the config that the find path
wont also expose.
---
 CMakeLists.txt         |  2 +-
 cmake/FindASSIMP.cmake | 56 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+), 1 deletion(-)
 create mode 100644 cmake/FindASSIMP.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 08f3a773..87adc797 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,7 +18,7 @@ IF(WIN32)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DVK_USE_PLATFORM_WIN32_KHR")
 ELSE(WIN32)
 	find_library(VULKAN_LIB NAMES libvulkan.so PATHS ${CMAKE_SOURCE_DIR}/libs/vulkan)
-	find_package(ASSIMP REQUIRED CONFIG)
+	find_package(ASSIMP REQUIRED)
 	find_package(XCB REQUIRED)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DVK_USE_PLATFORM_XCB_KHR")
 	# Todo : android?
diff --git a/cmake/FindASSIMP.cmake b/cmake/FindASSIMP.cmake
new file mode 100644
index 00000000..8b9b580d
--- /dev/null
+++ b/cmake/FindASSIMP.cmake
@@ -0,0 +1,56 @@
+# Find assimp
+# Copyright © 2016 Dylan Baker
+
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+# OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+# Provides a subset of what the one would get by calling CONFIG REQUIRED
+# directly, it will unset any unsupported versions
+# Currently it provides the following:
+#  ASSIMP_FOUND      -- TRUE if assimp was found
+#  ASSIMP_LIBRARIES  -- Libraries to link against
+
+find_package(ASSIMP CONFIG)
+if (ASSIMP_LIBRARIES)
+    # Unset variables that would be difficult to get via the find module
+    unset(ASSIMP_ROOT_DIR)
+    unset(ASSIMP_CXX_FLAGS)
+    unset(ASSIMP_LINK_FLAGS)
+    unset(ASSIMP_Boost_VERSION)
+
+    # TODO: It would be nice to find these, but they're not being used at the
+    # moment. They also need to be added to REQUIRED_VARS if added
+    unset(ASSIMP_INCLUDE_DIRS)
+    unset(ASSIMP_LIBRARY_DIRS)
+
+    # Like the found path
+    set(ASSIMP_FOUND TRUE)
+    message("-- Found ASSIMP")
+else ()
+    find_library(ASSIMP_LIBRARIES
+                 NAMES assimp
+    )
+
+    include(FindPackageHandleStandardArgs)
+    find_package_handle_standard_args(
+        ASSIMP
+        REQUIRED_VARS ASSIMP_LIBRARIES
+    )
+endif (ASSIMP_LIBRARIES)
+
+set(ASSIMP_FOUND True)