From 53e52cf3a8dfd2d28b10da1685037c9f65c6fc99 Mon Sep 17 00:00:00 2001
From: Michael Haberler <git@mah.priv.at>
Date: Fri, 10 Nov 2023 09:17:14 +0100
Subject: [PATCH] make the CMake_WASM example work again

---
 examples_for_PC/CMake_WASM/CMakeLists.txt |  2 +-
 examples_for_PC/CMake_WASM/LGFX_WASM.cpp  |  9 ++++-----
 examples_for_PC/CMake_WASM/README.md      | 15 +++++++++++++++
 3 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/examples_for_PC/CMake_WASM/CMakeLists.txt b/examples_for_PC/CMake_WASM/CMakeLists.txt
index c189b433..702a9991 100644
--- a/examples_for_PC/CMake_WASM/CMakeLists.txt
+++ b/examples_for_PC/CMake_WASM/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.12)
 project (lv_wasm)
 
 add_definitions(-DLGFX_SDL)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2 -s USE_SDL=2")
+set(CMAKE_CXX_FLAGS " ${CMAKE_CXX_FLAGS} -g -s USE_SDL=2")
 
 include_directories(../../../LovyanGFX/src/)
 
diff --git a/examples_for_PC/CMake_WASM/LGFX_WASM.cpp b/examples_for_PC/CMake_WASM/LGFX_WASM.cpp
index ed6c041a..804a9307 100644
--- a/examples_for_PC/CMake_WASM/LGFX_WASM.cpp
+++ b/examples_for_PC/CMake_WASM/LGFX_WASM.cpp
@@ -6,16 +6,15 @@
 void setup(void);
 void loop(void);
 
-void loopThread(void *arg)
+void loopThread(void)
 {
+  lgfx::Panel_sdl::loop();
   loop();
-  lgfx::Panel_sdl::sdl_event_handler();
 }
 
-int monitor_hor_res, monitor_ver_res;
-
 int main(int argc, char **argv)
 {
   setup();
-  emscripten_set_main_loop_arg(loopThread, NULL, -1, true);
+  lgfx::Panel_sdl::setup();
+  emscripten_set_main_loop(loopThread, -1, true);
 }
diff --git a/examples_for_PC/CMake_WASM/README.md b/examples_for_PC/CMake_WASM/README.md
index 7826996d..4386f8c3 100644
--- a/examples_for_PC/CMake_WASM/README.md
+++ b/examples_for_PC/CMake_WASM/README.md
@@ -14,4 +14,19 @@
 2. `cd build`
 3. `emcmake cmake ..`
 4. `emmake make`
+5. `http-server`
 5. open `index.html` in your browser.
+
+## Notes
+this is a debug build: `set(CMAKE_CXX_FLAGS " ${CMAKE_CXX_FLAGS} -g -s USE_SDL=2")`
+It uses the SDL2 library bundled with the Emscripten SDK so I think the `Install SDL``
+is not necessary
+
+### Debugging 
+I followed the [Debugging WebAssembly with modern tools](https://developer.chrome.com/blog/wasm-debugging-2020/) tutorial and was able to debug at the C source level just fine
+
+
+Steps:
+1. Install Chrome Canary
+2. Install the  C/C++ DevTools Support (DWARF) as outline 
+3. serve `index.html`  via `http-server` - opening file//wherever/index.html breaks debugging