From ca96c951435a0fa582a11f3f17957657b269dd6b Mon Sep 17 00:00:00 2001
From: Varun Patil <radialapps@gmail.com>
Date: Tue, 5 May 2020 18:01:13 +0530
Subject: [PATCH] Use webgl 2.0

---
 CMakeLists.txt |  2 +-
 src/main.cpp   | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f57c455..75f1810 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -453,7 +453,7 @@ SET(ASYNCIFY "-s ASYNCIFY=1 -s 'ASYNCIFY_IMPORTS=[\"load_file_async_js\"]'")
 
 SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${EMS_FLAGS} ${ERR_FLAGS} ${ASYNCIFY}")
 SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${EMS_FLAGS} ${ERR_FLAGS} ${ASYNCIFY}")
-SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${EMS_FLAGS} ${ASYNCIFY} -s INITIAL_MEMORY=536870912 -lopenal --preload-file game -s DISABLE_EXCEPTION_CATCHING=1 -s ASSERTIONS=0 -s SAFE_HEAP=0 -s MINIFY_HTML=0  --shell-file shell.html -s EMULATE_FUNCTION_POINTER_CASTS=0 -s ALLOW_MEMORY_GROWTH=1")
+SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${EMS_FLAGS} ${ASYNCIFY} -s INITIAL_MEMORY=536870912 -lopenal --preload-file game -s DISABLE_EXCEPTION_CATCHING=1 -s ASSERTIONS=0 -s SAFE_HEAP=0 -s MINIFY_HTML=0  --shell-file shell.html -s EMULATE_FUNCTION_POINTER_CASTS=0 -s ALLOW_MEMORY_GROWTH=1 -s MAX_WEBGL_VERSION=2")
 
 set_target_properties(
     ${PROJECT_NAME}
diff --git a/src/main.cpp b/src/main.cpp
index 6aa66b9..917df14 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -79,6 +79,19 @@ int rgssThreadFun(void *userdata)
 	/* Setup GL context */
 	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
 
+#ifdef __EMSCRIPTEN__
+	/* Set the color space to 24 bit */
+	SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
+	SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
+	SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
+	SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 0);
+	SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
+
+	/* Use WebGL 2.0 */
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+#endif
+
 	if (conf.debugMode)
 		SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_DEBUG_FLAG);