From 4ea4f3be957e1b5ecfda9e4709392ae9e5aa88be Mon Sep 17 00:00:00 2001
From: cutealien <cutealien@dfc29bdd-3216-0410-991c-e03cc46cb475>
Date: Sat, 18 Aug 2018 19:50:51 +0000
Subject: [PATCH] Make it easier to enable support for compiling emscripten to
 wasm. Add some documentation.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@5638 dfc29bdd-3216-0410-991c-e03cc46cb475
---
 examples/01.HelloWorld_emscripten/Makefile   | 11 +++++++++++
 examples/01.HelloWorld_emscripten/readme.txt |  2 ++
 source/Irrlicht/Makefile                     |  3 +++
 3 files changed, 16 insertions(+)

diff --git a/examples/01.HelloWorld_emscripten/Makefile b/examples/01.HelloWorld_emscripten/Makefile
index 1a90d83b..f60a678e 100644
--- a/examples/01.HelloWorld_emscripten/Makefile
+++ b/examples/01.HelloWorld_emscripten/Makefile
@@ -48,7 +48,11 @@ all_win32 clean_win32 static_win32: SYSTEM=Win32-gcc
 all_win32 clean_win32 static_win32: SUF=.exe
 all_emscripten clean_emscripten: SUF=.html
 all_emscripten: CXXFLAGS += -fno-exceptions -fno-rtti -fstrict-aliasing  -std=gnu++11 -U__STRICT_ANSI__
+# Pass on a custom html file.
+#all_emscripten: CXXFLAGS += --shell-file shell_minimal.html
 all_emscripten: LDFLAGS += -lGL -lSDL --preload-file ../../media@/media -s ALLOW_MEMORY_GROWTH=1 -s NO_EXIT_RUNTIME=1
+#If you know the maximum memory (in bytes) which your application need then set it. It can speed things up a lot.
+#all_emscripten: LDFLAGS += -s TOTAL_MEMORY=268435456
 # You need the FULL_ES2 when using EDT_OGLES2 driver
 #all_emscripten: LDFLAGS += -s FULL_ES2=1 
 static_win32: CPPFLAGS += -D_IRR_STATIC_LIB_
@@ -57,6 +61,13 @@ static_win32: LDFLAGS += -lgdi32 -lwinspool -lcomdlg32 -lole32 -loleaut32 -luuid
 # name of the binary - only valid for targets which set SYSTEM
 DESTPATH = $(BinPath)/$(Target)$(SUF)
 
+# Enable compiling to WASM and not just asm.js (you have to set it in the engine Makefile as well)
+ifdef EMSCRIPTEN
+  ifdef WASM
+    CXXFLAGS += -s WASM=1
+  endif
+endif
+
 emscripten: all_emscripten
 
 all_linux all_win32 all_emscripten static_win32:
diff --git a/examples/01.HelloWorld_emscripten/readme.txt b/examples/01.HelloWorld_emscripten/readme.txt
index b12bb328..e1cfb5b2 100644
--- a/examples/01.HelloWorld_emscripten/readme.txt
+++ b/examples/01.HelloWorld_emscripten/readme.txt
@@ -20,3 +20,5 @@ emmake make emscripten
 
 Go into examples/01.HelloWord_emscripten folder and call:
 emmake make all_emscripten
+
+Note: The shell_minimal.html is currently not used (as resizing isn't working yet correctly), but can be enabled in the Makefile.
diff --git a/source/Irrlicht/Makefile b/source/Irrlicht/Makefile
index 2979f3f9..b63bdfe8 100644
--- a/source/Irrlicht/Makefile
+++ b/source/Irrlicht/Makefile
@@ -90,6 +90,9 @@ ifdef EMSCRIPTEN
   else
     CFLAGS := -O3 -DPNG_THREAD_UNSAFE_OK -DPNG_NO_MMX_CODE -DPNG_NO_MNG_FEATURES
   endif
+  ifdef WASM
+    CXXFLAGS += -s WASM=1
+  endif  
 else
   CFLAGS := -O3 -fexpensive-optimizations -DPNG_THREAD_UNSAFE_OK -DPNG_NO_MMX_CODE -DPNG_NO_MNG_FEATURES
 endif