Expose mute channel functionality to WASM build (#57)

* Remove unsupported flag

Update CMakeList to remove unsupported flag --memory-init-file

* Add functionality for GB Studio

Add a GBSTUDIO compile flag, that exposes the following functionality:

* Set audio channel mute
* Functions exposes with the RGBDS_LIVE flag

CMakeLists.txt

@@ -9,6 +9,7 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${PROJECT_SOURCE_DIR}/cmake)
 option(WERROR "Build with warnings as errors" OFF)
 option(WASM "Build for WebAssembly" OFF)
 option(RGBDS_LIVE "Build for rgbds-live (Wasm only)" OFF)
+option(GBSTUDIO "Build for GB Studio (Wasm only. Sets rgbds-live.)" OFF)
 
 if (MSVC)
   add_definitions(-W3 -D_CRT_SECURE_NO_WARNINGS)
@@ -152,8 +153,12 @@ else (EMSCRIPTEN)
     target_compile_definitions(binjgb PUBLIC RGBDS_LIVE)
   endif ()
 
+  if (GBSTUDIO)
+    # If GBSTUDIO is set, set RGBDS_LIVE too
+    target_compile_definitions(binjgb PUBLIC GBSTUDIO RGBDS_LIVE)
+  endif ()
+
   set(LINK_FLAGS
-    --memory-init-file 0
     -s EXPORTED_FUNCTIONS=\"@${EXPORTED_JSON}\"
     -s MALLOC=emmalloc
     -s ASSERTIONS=0

src/emscripten/exported.json

@@ -59,5 +59,6 @@
 "_emulator_get_wram_ptr",
 "_emulator_get_hram_ptr",
 "_emulator_read_mem",
-"_emulator_write_mem"
+"_emulator_write_mem",
+"_set_audio_channel_mute"
 ]

src/emulator.c

@@ -5258,3 +5258,19 @@ void emulator_render_vram(Emulator* e, u32* buffer) {}
 void emulator_render_background(Emulator* e, u32* buffer, int type) {}
 
 #endif
+
+#ifdef GBSTUDIO
+Bool set_audio_channel_mute(Emulator *e, int channel, Bool muted) {
+  EmulatorConfig emu_config = emulator_get_config(e);
+  emu_config.disable_sound[channel] = muted;
+  emulator_set_config(e, &emu_config);
+  return emu_config.disable_sound[channel];
+}
+
+#else  // !GBSTUDIO
+
+Bool set_audio_channel_mute(Emulator *e, int channel, Bool muted) { 
+  return FALSE;
+}
+
+#endif