Update GLFW to 3.3 (#1153)

* Update GLFW and Embree + use git urls (fixes #1019).

* Simplify Embree build.

* More robust top-level project detection.

.appveyor.yml

@@ -25,7 +25,11 @@ build_script:
   - set PATH=C:\Python%PYTHON%-x64;C:\Python%PYTHON%-x64\Scripts;%PATH%
   - mkdir build
   - cd build
-  - cmake -DCMAKE_BUILD_TYPE=%CONFIG% -DLIBIGL_WITH_CGAL=ON -DLIBIGL_WITH_COMISO=OFF -DEMBREE_ISA_AVX=OFF -DEMBREE_ISA_AVX2=OFF -DEMBREE_ISA_AVX512SKX=OFF -G "Visual Studio 15 2017 Win64" ../
+  - cmake -DCMAKE_BUILD_TYPE=%CONFIG%
+      -DLIBIGL_WITH_CGAL=ON
+      -DLIBIGL_WITH_COMISO=OFF
+      -G "Visual Studio 15 2017 Win64"
+      ../
   - set MSBuildLogger="C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
   - set MSBuildOptions=/v:m /m /p:BuildInParallel=true /p:Configuration=%CONFIG% /logger:%MSBuildLogger%
   - msbuild %MSBuildOptions% libigl.sln

.travis.yml

@@ -39,7 +39,7 @@ matrix:
   - os: linux
     compiler: gcc-7
     env:
-    - MATRIX_EVAL="export CC=gcc-7 CXX=g++-7 CONFIG=Release PYTHON=python3 CMAKE_EXTRA='-DLIBIGL_EIGEN_VERSION=3.3.7 -DLIBIGL_EIGEN_MD5=f2a417d083fe8ca4b8ed2bc613d20f07'"
+    - MATRIX_EVAL="export CC=gcc-7 CXX=g++-7 CONFIG=Release PYTHON=python3 CMAKE_EXTRA='-DLIBIGL_EIGEN_VERSION=3.3.7'"
   - os: osx
     compiler: clang
     env:
@@ -51,7 +51,7 @@ matrix:
   - os: osx
     compiler: clang
     env:
-    - MATRIX_EVAL="export CONFIG=Debug PYTHON=python3 LIBIGL_NUM_THREADS=1 CMAKE_EXTRA='-DLIBIGL_EIGEN_VERSION=3.3.7 -DLIBIGL_EIGEN_MD5=f2a417d083fe8ca4b8ed2bc613d20f07'""
+    - MATRIX_EVAL="export CONFIG=Debug PYTHON=python3 LIBIGL_NUM_THREADS=1 CMAKE_EXTRA='-DLIBIGL_EIGEN_VERSION=3.3.7'""
 
 install:
 - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then export PATH="/usr/local/opt/ccache/libexec:$PATH"; fi
@@ -63,7 +63,11 @@ script:
 # Tutorials and tests
 - mkdir build
 - pushd build
-- cmake ${CMAKE_EXTRA} -DCMAKE_BUILD_TYPE=$CONFIG -DLIBIGL_CHECK_UNDEFINED=ON -DLIBIGL_WITH_CGAL=ON -DEMBREE_ISA_AVX=OFF -DEMBREE_ISA_AVX2=OFF -DEMBREE_ISA_AVX512SKX=OFF ../
+- cmake ${CMAKE_EXTRA}
+    -DCMAKE_BUILD_TYPE=$CONFIG
+    -DLIBIGL_CHECK_UNDEFINED=ON
+    -DLIBIGL_WITH_CGAL=ON
+    ../
 - make -j 2
 - ctest --verbose
 - popd

CMakeLists.txt

@@ -2,7 +2,8 @@ cmake_minimum_required(VERSION 3.1)
 project(libigl)
 
 # Detects whether this is a top-level project
-if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+get_directory_property(LIBIGL_PARENT_DIR PARENT_DIRECTORY)
+if(NOT LIBIGL_PARENT_DIR)
 	set(LIBIGL_TOPLEVEL_PROJECT ON)
 else()
 	set(LIBIGL_TOPLEVEL_PROJECT OFF)

cmake/LibiglDownloadExternal.cmake

@@ -2,12 +2,21 @@
 include(DownloadProject)
 
 # With CMake 3.8 and above, we can hide warnings about git being in a
-# detached head by passing an extra GIT_CONFIG option
+# detached head by passing an extra GIT_CONFIG option.
 set(LIBIGL_EXTRA_OPTIONS TLS_VERIFY OFF)
 if(NOT (${CMAKE_VERSION} VERSION_LESS "3.8.0"))
 	list(APPEND LIBIGL_EXTRA_OPTIONS GIT_CONFIG advice.detachedHead=false)
 endif()
 
+# On CMake 3.6.3 and above, there is an option to use shallow clones of git repositories.
+# The shallow clone option only works with real tags, not SHA1, so we use a separate option.
+set(LIBIGL_BRANCH_OPTIONS)
+if(NOT (${CMAKE_VERSION} VERSION_LESS "3.6.3"))
+	# Disabled for now until we can make sure that it has no adverse effects
+	# (Downside is that the eigen mirror is huge again)
+	# list(APPEND LIBIGL_BRANCH_OPTIONS GIT_SHALLOW 1)
+endif()
+
 option(LIBIGL_SKIP_DOWNLOAD "Skip downloading external libraries" OFF)
 
 # Shortcut functions
@@ -55,24 +64,21 @@ function(igl_download_cork)
 endfunction()
 
 ## Eigen
-# 3.2.10 8ad10ac703a78143a4062c9bda9d8fd3
+set(LIBIGL_EIGEN_VERSION 3.2.10 CACHE STRING "Default version of Eigen used by libigl.")
-# 3.3.7  f2a417d083fe8ca4b8ed2bc613d20f07
-set(LIBIGL_EIGEN_VERSION 3.2.10                           CACHE STRING "Default version of Eigen used by libigl.")
-set(LIBIGL_EIGEN_MD5     8ad10ac703a78143a4062c9bda9d8fd3 CACHE STRING "md5sum of the tar.gz archive corresponding to this version.")
 function(igl_download_eigen)
 	igl_download_project(eigen
-		URL           http://bitbucket.org/eigen/eigen/get/${LIBIGL_EIGEN_VERSION}.tar.gz
+		GIT_REPOSITORY https://github.com/eigenteam/eigen-git-mirror.git
-		URL_MD5       ${LIBIGL_EIGEN_MD5}
+		GIT_TAG        ${LIBIGL_EIGEN_VERSION}
+		${LIBIGL_BRANCH_OPTIONS}
 	)
 endfunction()
 
 ## Embree
 function(igl_download_embree)
 	igl_download_project(embree
-		URL            https://github.com/embree/embree/archive/v3.2.3.tar.gz
+		GIT_REPOSITORY https://github.com/embree/embree.git
-		URL_MD5        1868cda1c97d83d7a0b67b0b64b18cef
+		GIT_TAG        v3.5.2
-		# GIT_REPOSITORY https://github.com/embree/embree.git
+		${LIBIGL_BRANCH_OPTIONS}
-		# GIT_TAG        cb61322db3bb7082caed21913ad14869b436fe78
 	)
 endfunction()
 
@@ -88,7 +94,8 @@ endfunction()
 function(igl_download_glfw)
 	igl_download_project(glfw
 		GIT_REPOSITORY https://github.com/glfw/glfw.git
-		GIT_TAG        53c8c72c676ca97c10aedfe3d0eb4271c5b23dba
+		GIT_TAG        3.3
+		${LIBIGL_BRANCH_OPTIONS}
 	)
 endfunction()
 
@@ -97,6 +104,7 @@ function(igl_download_imgui)
 	igl_download_project(imgui
 		GIT_REPOSITORY https://github.com/ocornut/imgui.git
 		GIT_TAG        v1.69
+		${LIBIGL_BRANCH_OPTIONS}
 	)
 	igl_download_project(libigl-imgui
 		GIT_REPOSITORY https://github.com/libigl/libigl-imgui.git

cmake/libigl.cmake

@@ -271,11 +271,11 @@ endif()
 if(LIBIGL_WITH_EMBREE)
   set(EMBREE_DIR "${LIBIGL_EXTERNAL}/embree")
 
-  set(EMBREE_TESTING_INTENSITY 0 CACHE INT "" FORCE)
+  set(EMBREE_TESTING_INTENSITY 0 CACHE STRING "" FORCE)
   set(EMBREE_ISPC_SUPPORT OFF CACHE BOOL " " FORCE)
   set(EMBREE_TASKING_SYSTEM "INTERNAL" CACHE BOOL " " FORCE)
   set(EMBREE_TUTORIALS OFF CACHE BOOL " " FORCE)
-  set(EMBREE_MAX_ISA NONE CACHE STRINGS " " FORCE)
+  set(EMBREE_MAX_ISA "SSE2" CACHE STRING " " FORCE)
   set(EMBREE_STATIC_LIB ON CACHE BOOL " " FORCE)
   if(MSVC)
     set(EMBREE_STATIC_RUNTIME ON CACHE BOOL " " FORCE)