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What does it do?

The purpose of this example is to demonstrate the use of OffscreenCanvas which enables using WebGL contexts in pthreads

Building instructions

Using emcc from the command line (make sure it is in your path)

mkdir build
emcc --use-port=contrib.glfw3 -pthread -sPROXY_TO_PTHREAD -sOFFSCREENCANVAS_SUPPORT -sOFFSCREENCANVASES_TO_PTHREAD='canvas' -sMIN_WEBGL_VERSION=2 --shell-file=shell.html main.cpp -o build/index.html
set(target "example-offscreen-canvas")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pthread --use-port=contrib.glfw3 -sEXIT_RUNTIME=1 -sOFFSCREENCANVAS_SUPPORT -sOFFSCREENCANVASES_TO_PTHREAD='canvas' -sPROXY_TO_PTHREAD -s SAFE_HEAP=1 -s ASSERTIONS=1 -s WASM=1 --shell-file ${CMAKE_CURRENT_LIST_DIR}/shell.html")
add_executable(${target} main.cpp)
target_compile_options(${target} PUBLIC "-pthread")
set_target_properties(${target} PROPERTIES OUTPUT_NAME "main")
set_target_properties(${target} PROPERTIES SUFFIX ".html")
target_link_libraries(${target} PRIVATE glfw3_pthread)

Running instructions

Note

Due to the limitations with browsers, this test needs to be run with emrun which automatically takes care of the right headers.

emrun --browser firefox build/main.html