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Examples: (Again, but better) made SDL+GL and GLFW+GL examples build with Emscripten. (#2492, #2494, #3699, #3705)
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@ -98,7 +98,8 @@ All changes:
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- Backends: WebGPU: Fix building for latest WebGPU specs (remove implicit layout generation).
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(#6117, #4116, #3632) [@tonygrue, @bfierz]
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- Examples: refactored SDL+GL and GLFW+GL examples to compile with Emscripten.
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(the dedicated example_emscripten_opengl3/ has been removed) (#2492, #2494, #3699, #3705)
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(#2492, #2494, #3699, #3705) [@ocornut, @nicolasnoble]
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The dedicated example_emscripten_opengl3/ has been removed.
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- Examples: Win32: Fixed examples using RegisterClassW() since 1.89 to also call
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DefWindowProcW() instead of DefWindowProc() so that title text are correctly converted
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when application is compiled without /DUNICODE. (#5725, #5961, #5975) [@markreidvfx]
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@ -20,6 +20,11 @@
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#pragma comment(lib, "legacy_stdio_definitions")
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#endif
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// This example can also compile and run with Emscripten! See 'Makefile.emscripten' for details.
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#ifdef __EMSCRIPTEN__
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#include "../libs/emscripten/emscripten_mainloop_stub.h"
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#endif
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static void glfw_error_callback(int error, const char* description)
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{
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fprintf(stderr, "GLFW Error %d: %s\n", error, description);
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@ -85,6 +90,7 @@ int main(int, char**)
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// - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
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// - Read 'docs/FONTS.md' for more instructions and details.
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// - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
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// - Our Emscripten build process allows embedding fonts to be accessible at runtime from the "fonts/" folder. See Makefile.emscripten for details.
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//io.Fonts->AddFontDefault();
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//io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\segoeui.ttf", 18.0f);
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//io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
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@ -99,7 +105,14 @@ int main(int, char**)
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ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
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// Main loop
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#ifdef __EMSCRIPTEN__
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// For an Emscripten build we are disabling file-system access, so let's not attempt to do a fopen() of the imgui.ini file.
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// You may manually call LoadIniSettingsFromMemory() to load settings from your own storage.
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io.IniFilename = NULL;
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EMSCRIPTEN_MAINLOOP_BEGIN
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#else
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while (!glfwWindowShouldClose(window))
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#endif
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{
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// Poll and handle events (inputs, window resize, etc.)
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// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
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@ -161,6 +174,9 @@ int main(int, char**)
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glfwSwapBuffers(window);
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}
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#ifdef __EMSCRIPTEN__
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EMSCRIPTEN_MAINLOOP_END;
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#endif
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// Cleanup
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ImGui_ImplOpenGL3_Shutdown();
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@ -14,6 +14,11 @@
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#include <SDL_opengl.h>
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#endif
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// This example can also compile and run with Emscripten! See 'Makefile.emscripten' for details.
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#ifdef __EMSCRIPTEN__
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#include "../libs/emscripten/emscripten_mainloop_stub.h"
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#endif
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// Main code
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int main(int, char**)
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{
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@ -81,6 +86,7 @@ int main(int, char**)
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// - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
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// - Read 'docs/FONTS.md' for more instructions and details.
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// - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
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// - Our Emscripten build process allows embedding fonts to be accessible at runtime from the "fonts/" folder. See Makefile.emscripten for details.
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//io.Fonts->AddFontDefault();
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//io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\segoeui.ttf", 18.0f);
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//io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
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@ -96,7 +102,14 @@ int main(int, char**)
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// Main loop
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bool done = false;
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#ifdef __EMSCRIPTEN__
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// For an Emscripten build we are disabling file-system access, so let's not attempt to do a fopen() of the imgui.ini file.
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// You may manually call LoadIniSettingsFromMemory() to load settings from your own storage.
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io.IniFilename = NULL;
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EMSCRIPTEN_MAINLOOP_BEGIN
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#else
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while (!done)
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#endif
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{
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// Poll and handle events (inputs, window resize, etc.)
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// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
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@ -163,6 +176,9 @@ int main(int, char**)
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ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
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SDL_GL_SwapWindow(window);
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}
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#ifdef __EMSCRIPTEN__
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EMSCRIPTEN_MAINLOOP_END;
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#endif
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// Cleanup
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ImGui_ImplOpenGL3_Shutdown();
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37
examples/libs/emscripten/emscripten_mainloop_stub.h
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37
examples/libs/emscripten/emscripten_mainloop_stub.h
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@ -0,0 +1,37 @@
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// What does this file solves?
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// - Since Dear ImGui 1.00 we took pride that most of our examples applications had their entire
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// main-loop inside the main() function. That's because:
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// - It makes the examples easier to read, keeping the code sequential.
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// - It permit the use of local variables, making it easier to try things and perform quick
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// changes when someone needs to quickly test something (vs having to structure the example
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// in order to pass data around). This is very important because people use those examples
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// to craft easy-to-past repro when they want to discuss features or report issues.
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// - It conveys at a glance that this is a no-BS framework, it won't take your main loop away from you.
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// - It is generally nice and elegant.
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// - However, comes Emscripten... it is a wonderful and magical tech but it requires a "main loop" function.
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// - Only some of our examples would run on Emscripten. Typically the ones rendering with GL or WGPU ones.
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// - I tried to refactor those examples but felt it was problematic that other examples didn't follow the
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// same layout. Why would the SDL+GL example be structured one way and the SGL+DX11 be structured differently?
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// Especially as we are trying hard to convey that using a Dear ImGui backend in an *existing application*
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// should requires only a few dozens lines of code, and this should be consistent and symmetrical for all backends.
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// - So the next logical step was to refactor all examples to follow that layout of using a "main loop" function.
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// This worked, but it made us lose all the nice things we had...
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// Since only about 3 examples really need to run with Emscripten, here's our solution:
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// - Use some weird macros and capturing lambda to turn a loop in main() into a function.
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// - Hide all that crap in this file so it doesn't make our examples unusually ugly.
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// As a stance and principle of Dear ImGui development we don't use C++ headers and we don't
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// want to suggest to the newcomer that we would ever use C++ headers as this would affect
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// the initial judgment of many of our target audience.
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// - Technique is based on this idea: https://github.com/ocornut/imgui/pull/2492/
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#ifdef __EMSCRIPTEN__
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#include <emscripten.h>
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#include <functional>
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static std::function<void()> MainLoopForEmscriptenP;
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static void MainLoopForEmscripten() { MainLoopForEmscriptenP(); }
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#define EMSCRIPTEN_MAINLOOP_BEGIN MainLoopForEmscriptenP = [&]()
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#define EMSCRIPTEN_MAINLOOP_END ; emscripten_set_main_loop(MainLoopForEmscripten, 0, true)
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#else
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#define EMSCRIPTEN_MAINLOOP_BEGIN
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#define EMSCRIPTEN_MAINLOOP_END
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#endif
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