From e9b36ed8c32ee3da67541ec7f4caf37d39af5619 Mon Sep 17 00:00:00 2001
From: Alan Youngblood <ayoungblood@oakcityit.net>
Date: Wed, 9 Aug 2023 17:01:59 -0400
Subject: [PATCH] Beginning emscripten refactor with separate build script

---
 CMakeLists.txt      |  1 +
 build_emscripten.sh |  1 +
 src/game/Main.cpp   | 44 ++++++++++++++++++++++++++------------------
 3 files changed, 28 insertions(+), 18 deletions(-)
 create mode 100755 build_emscripten.sh

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3955b63..de27460 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,6 +4,7 @@ project(KaijuSaveEarth VERSION 1.0.0 )
 #set(CMAKE_CXX_STANDARD 11) # old requirements
 set(CMAKE_CXX_STANDARD 17 CACHE STRING "C++ standard to be used") # new requirements for tileson
 set(CMAKE_CXX_REQUIRED ON)
+#set(CMAKE_CXX_COMPILER "/home/ayoungblood/Git/emsdk/upstream/emscripten/emcc")
 
 include(FetchContent)
 include(FindPkgConfig)
diff --git a/build_emscripten.sh b/build_emscripten.sh
new file mode 100755
index 0000000..686f7d1
--- /dev/null
+++ b/build_emscripten.sh
@@ -0,0 +1 @@
+emcc src/game/Main.cpp -s WASM=1 -s USE_SDL=2 -s USE_SDL_IMAGE=2 -s SDL2_IMAGE_FORMATS='["png"]' -s USE_SDL_MIXER=2 -o build/index.js
diff --git a/src/game/Main.cpp b/src/game/Main.cpp
index 791169b..f4627be 100644
--- a/src/game/Main.cpp
+++ b/src/game/Main.cpp
@@ -11,25 +11,21 @@
 #include <iostream>
 #include <fstream>
 #include <sstream>
+#include <emscripten.h>
 
 Game *game = nullptr;
 
-int main(int argc, const char * argv[])
-{
+struct context{
 	const int FPS = 60;
 	const int frameDelay = 1000 / FPS;
 
 	Uint64 frameStart;
 	int frameTime;
-
-//      =============================
-//      Load cJSON config.json file
-//      =============================
-// Starting with Error Checking    
     std::string configPath = "src/config/config.json";
     std::ifstream fin(configPath);
-    
-    if(fin.is_open()){
+    // if(!fin.is_open()){
+    //     std::cout << "Failed to load Config.json" << std::endl;
+    // } else {
         std::ifstream jsonText("src/config/config.json");
         std::ostringstream tmp;
         tmp << jsonText.rdbuf();
@@ -49,26 +45,38 @@ int main(int argc, const char * argv[])
         {
         	isWindowFS = true;
         }
-        windowWidth = windowWidth*globalScale;
-        windowHeight = windowHeight*globalScale;
+
+    // }
+};
+
+
+int main(int argc, const char * argv[])
+{
+    context ctx;
+    if(ctx.fin.is_open()){
+
 	game = new Game();
-	game->init(windowName->valuestring, windowWidth, windowHeight, isWindowFS, globalScale);
+    ctx.windowWidth = ctx.windowWidth*ctx.globalScale;
+    ctx.windowHeight = ctx.windowHeight*ctx.globalScale;
+	game->init(ctx.windowName->valuestring, ctx.windowWidth, ctx.windowHeight, ctx.isWindowFS, ctx.globalScale);
 //	cJSON memory management
-    cJSON_Delete(myJSON);
+    cJSON_Delete(ctx.myJSON);
+
+    init(&ctx);
 
 	while (game->running())
 	{
-		frameStart = SDL_GetTicks64();
+		ctx.frameStart = SDL_GetTicks64();
 
 		game->handleEvents();
 		game->update();
 		game->render();
 
-		frameTime = SDL_GetTicks64() - frameStart;
+		ctx.frameTime = SDL_GetTicks64() - ctx.frameStart;
 
-		if(frameDelay > frameTime)
+		if(ctx.frameDelay > ctx.frameTime)
 		{
-			SDL_Delay(frameDelay - frameTime);
+			SDL_Delay(ctx.frameDelay - ctx.frameTime);
 		}
 
 	}
@@ -77,7 +85,7 @@ int main(int argc, const char * argv[])
         std::cout<<"config.json not found or opened"<<std::endl;
     }
     
-    if(fin.fail()){
+    if(ctx.fin.fail()){
         std::cout<<"config.json load failed"<<std::endl;
     }