2017-06-22 10:44:06 +08:00
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CMAKE_MINIMUM_REQUIRED(VERSION 2.8.0 FATAL_ERROR)
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# Path to OpenSceneGraph
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SET(OSG_DIR "${CMAKE_SOURCE_DIR}/../..")
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# Specify critical OpenSceneGraph build variables.
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SET(BUILD_OSG_APPLICATIONS NO CACHE BOOL "Do not build applications")
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SET(EGL_LIBRARY "GL" CACHE STRING "Suppress linkage error")
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SET(OSG_GL1_AVAILABLE OFF CACHE BOOL "Unavailable under Emscripten")
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SET(OSG_GL2_AVAILABLE OFF CACHE BOOL "Unavailable under Emscripten")
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SET(OSG_GLES2_AVAILABLE ON CACHE BOOL "GLES2 is what Emscripten uses")
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2017-08-27 00:25:00 +08:00
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SET(OSG_WINDOWING_SYSTEM "None" CACHE STRING "Unavailable under Emscripten")
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2017-06-22 10:44:06 +08:00
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SET(DYNAMIC_OPENTHREADS OFF CACHE BOOL "Link OpenThreads statically")
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SET(DYNAMIC_OPENSCENEGRAPH OFF CACHE BOOL "Link OpenSceneGraph statically")
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2017-08-27 00:25:00 +08:00
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# Prevent CMake configuration error.
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SET(_OPENTHREADS_ATOMIC_USE_GCC_BUILTINS_EXITCODE "0" CACHE STRING "Prevent cfg error")
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2018-03-23 23:07:07 +08:00
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# Set special build flags:
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# * -O3: make compact binary, critical for web
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# * -s USE_SDL=2: provide SDL2
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SET(BUILD_FLAGS "-O3 -s USE_SDL=2")
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ADD_DEFINITIONS(${BUILD_FLAGS})
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2017-06-22 10:44:06 +08:00
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# Reference OpenSceneGraph includes and libraries.
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SET(OSG_SOURCE_DIR "${OSG_DIR}")
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SET(OSG_BUILD_DIR "${OSG_DIR}/build/Emscripten")
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INCLUDE_DIRECTORIES(${OSG_SOURCE_DIR}/include)
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INCLUDE_DIRECTORIES(${OSG_BUILD_DIR}/include)
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LINK_DIRECTORIES(${OSG_BUILD_DIR}/lib)
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# Build OpenSceneGraph if osgViewer library is missing.
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IF(EXISTS "${OSG_BUILD_DIR}/lib/libosgViewer.a")
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MESSAGE("Skip building OpenSceneGraph")
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ELSE()
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MESSAGE("Build OpenSceneGraph")
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FILE(MAKE_DIRECTORY ${OSG_BUILD_DIR})
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ADD_SUBDIRECTORY(${OSG_SOURCE_DIR} ${OSG_BUILD_DIR})
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ENDIF()
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# Build example.
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ADD_EXECUTABLE(osgemscripten osgemscripten.cpp)
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# Make Emscripten generate ready-to-open HTML page.
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SET(CMAKE_EXECUTABLE_SUFFIX ".html")
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# Make Emscripten preload the resource.
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2018-03-23 23:07:07 +08:00
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SET_TARGET_PROPERTIES(osgemscripten PROPERTIES LINK_FLAGS "--preload-file box.osgt ${BUILD_FLAGS}")
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2017-06-22 10:44:06 +08:00
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# Copy the resource to the build directory.
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CONFIGURE_FILE(box.osgt box.osgt COPYONLY)
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# Libraries must be linked in the specified order.
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# Otherwise you may get unsatisified linker errors.
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TARGET_LINK_LIBRARIES(
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osgemscripten
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osgViewer
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osgDB
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# osgDB plugins start.
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osgdb_osg
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osgdb_serializers_osg
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# osgDB plugins end.
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osgGA
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osgText
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osgUtil
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osg
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OpenThreads
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)
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