From c4810048c1f76d0088e785f06afbb34baa4afb3a Mon Sep 17 00:00:00 2001
From: theverygaming <clemibunge@gmail.com>
Date: Mon, 13 Feb 2023 10:00:06 +0100
Subject: [PATCH] emscripten

---
 .gitignore |  5 +++++
 Makefile   | 10 +++++++++-
 src/main.c | 17 +++++++++++++++++
 3 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 3a9e9dd..fa0df25 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,8 @@ fox32
 
 fox32.exe
 SDL2.dll
+
+fox32.html
+fox32.wasm
+fox32.js
+fox32.data
diff --git a/Makefile b/Makefile
index 4c9a3ad..4d796b7 100644
--- a/Makefile
+++ b/Makefile
@@ -2,8 +2,11 @@ SDL2_CONFIG = sdl2-config
 CFLAGS = -g -Ofast -std=c99 -Wall -Wextra `$(SDL2_CONFIG) --cflags --libs`
 CC_WIN = x86_64-w64-mingw32-gcc
 CFLAGS_WIN = -g -Ofast -std=c99 -Wall -Wextra -lmingw32 -lSDL2main -lSDL2
+CC_WASM = emcc
+CFLAGS_WASM = -O3 -std=c99 -Wall -Wextra -s TOTAL_MEMORY=70057984 -sALLOW_MEMORY_GROWTH=1 -sUSE_SDL=2 --preload-file fox32os.img
 TARGET=fox32
 TARGET_WIN=fox32.exe
+TARGET_WASM=fox32.html
 
 CFILES = src/main.c \
 		src/bus.c \
@@ -29,5 +32,10 @@ $(TARGET_WIN): $(CFILES)
 	sed -i -e 's/fox32_rom/fox32rom/' fox32rom.h
 	$(CC_WIN) -o $@ $(filter %.c, $^) $(CFLAGS_WIN)
 
+$(TARGET_WASM): $(CFILES) $(FOX32ROM_IN)
+	xxd -i $(FOX32ROM_IN) $(FOX32ROM_OUT)
+	sed -i -e 's/fox32_rom/fox32rom/' fox32rom.h
+	$(CC_WASM) -o $@ $(filter %.c, $^) $(CFLAGS_WASM)
+
 clean:
-	rm -rf fox32 fox32.exe
+	rm -rf $(TARGET) $(TARGET_WIN) $(TARGET_WASM)
diff --git a/src/main.c b/src/main.c
index cb31e2d..332b172 100644
--- a/src/main.c
+++ b/src/main.c
@@ -8,6 +8,10 @@
 #include <string.h>
 #include <sys/time.h>
 #include <time.h>
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+#include <emscripten/html5.h>
+#endif
 
 #include "bus.h"
 #include "cpu.h"
@@ -50,6 +54,7 @@ int main(int argc, char *argv[]) {
     memcpy(vm.memory_rom, fox32rom, sizeof(fox32rom));
 
     size_t disk_id = 0;
+#ifndef __EMSCRIPTEN__
     for (int i = 1; i < argc; i++) {
         if (strcmp(argv[i], "--help") == 0) {
             fprintf(stderr,
@@ -87,6 +92,9 @@ int main(int argc, char *argv[]) {
             return 1;
         }
     }
+#else
+    new_disk("fox32os.img", disk_id++);
+#endif
 
     if (!vm.headless) {
         if (SDL_Init(SDL_INIT_VIDEO) != 0) {
@@ -116,6 +124,10 @@ int main(int argc, char *argv[]) {
     tick_start = SDL_GetTicks();
     tick_end = SDL_GetTicks();
 
+#ifdef __EMSCRIPTEN__
+    emscripten_set_main_loop(main_loop, FPS, 1);
+#endif
+
     while (!done && !bus_requests_exit) {
         main_loop();
 
@@ -132,6 +144,11 @@ int main(int argc, char *argv[]) {
 }
 
 void main_loop(void) {
+#ifdef __EMSCRIPTEN__
+    if (done || bus_requests_exit) {
+        emscripten_cancel_main_loop();
+    }
+#endif
     int dt = SDL_GetTicks() - tick_start;
     tick_start = SDL_GetTicks();
     if (!dt)