Remove GLUT usage in HTML5 platform

3 files changed, 27 insertions, 75 deletions

diff --git a/platform/javascript/javascript_main.cpp b/platform/javascript/javascript_main.cpp
index e122bb2e4d..6b1d574496 100644
--- a/platform/javascript/javascript_main.cpp
+++ b/platform/javascript/javascript_main.cpp
@@ -31,94 +31,50 @@
 #include "io/resource_loader.h"
 #include "main/main.h"
 #include "os_javascript.h"
-#include <GL/glut.h>
-#include <string.h>
 
 OS_JavaScript *os = NULL;
 
-static void _gfx_init(void *ud, bool gl2, int w, int h, bool fs) {
+static void main_loop() {
 
-	glutInitWindowSize(w, h);
-	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
-	glutCreateWindow("godot");
+	os->main_loop_iterate();
 }
 
-static void _gfx_idle() {
+extern "C" void main_after_fs_sync() {
 
-	glutPostRedisplay();
-}
-
-int start_step = 0;
-
-static void _godot_draw(void) {
-
-	if (start_step == 1) {
-		start_step = 2;
-		Main::start();
-		os->main_loop_begin();
-	}
-
-	if (start_step == 2) {
-		os->main_loop_iterate();
-	}
-
-	glutSwapBuffers();
-}
-
-extern "C" {
-
-void main_after_fs_sync() {
-
-	start_step = 1;
-}
+	// Ease up compatibility
+	ResourceLoader::set_abort_on_missing_resources(false);
+	Main::start();
+	os->main_loop_begin();
+	emscripten_set_main_loop(main_loop, 0, false);
 }
 
 int main(int argc, char *argv[]) {
 
-	/* Initialize the window */
 	printf("let it go dude!\n");
-	glutInit(&argc, argv);
-	os = new OS_JavaScript(argv[0], _gfx_init, NULL, NULL);
-
-	Error err = Main::setup(argv[0], argc - 1, &argv[1]);
-
-	ResourceLoader::set_abort_on_missing_resources(false); //ease up compatibility
-
-	/* Set up glut callback functions */
-	glutIdleFunc(_gfx_idle);
-	//   glutReshapeFunc(gears_reshape);
-	glutDisplayFunc(_godot_draw);
-	//glutSpecialFunc(gears_special);
 
-	//mount persistent file system
+	// sync from persistent state into memory and then
+	// run the 'main_after_fs_sync' function
 	/* clang-format off */
 	EM_ASM(
+		Module.noExitRuntime = true;
 		FS.mkdir('/userfs');
 		FS.mount(IDBFS, {}, '/userfs');
-
-		// sync from persistent state into memory and then
-		// run the 'main_after_fs_sync' function
 		FS.syncfs(true, function(err) {
-
 			if (err) {
 				Module.setStatus('Failed to load persistent data\nPlease allow (third-party) cookies');
 				Module.printErr('Failed to populate IDB file system: ' + err.message);
-				Module.exit();
+				Module.noExitRuntime = false;
 			} else {
 				Module.print('Successfully populated IDB file system');
-				ccall('main_after_fs_sync', 'void', []);
+				ccall('main_after_fs_sync', null);
 			}
 		});
 	);
 	/* clang-format on */
 
-	glutMainLoop();
+	os = new OS_JavaScript(argv[0], NULL);
+	Error err = Main::setup(argv[0], argc - 1, &argv[1]);
 
 	return 0;
+	// continued async in main_after_fs_sync() from syncfs() callback
 }
-
-/*
- *
- *09] <azakai|2__> reduz: yes, define  TOTAL_MEMORY on Module. for example             var Module = { TOTAL_MEMORY: 12345.. };         before the main
- *
- */
diff --git a/platform/javascript/os_javascript.cpp b/platform/javascript/os_javascript.cpp
index 7d073654ce..f42376e104 100644
--- a/platform/javascript/os_javascript.cpp
+++ b/platform/javascript/os_javascript.cpp
@@ -390,14 +390,18 @@ void OS_JavaScript::initialize(const VideoMode &p_desired, int p_video_driver, i
 
 	print_line("Init OS");
 
-	if (gfx_init_func)
-		gfx_init_func(gfx_init_ud, use_gl2, p_desired.width, p_desired.height, p_desired.fullscreen);
+	EmscriptenWebGLContextAttributes attributes;
+	emscripten_webgl_init_context_attributes(&attributes);
+	attributes.alpha = false;
+	attributes.antialias = false;
+	attributes.majorVersion = 2;
+	EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx = emscripten_webgl_create_context(NULL, &attributes);
+	ERR_FAIL_COND(emscripten_webgl_make_context_current(ctx) != EMSCRIPTEN_RESULT_SUCCESS);
 
-	// nothing to do here, can't fulfil fullscreen request due to
-	// browser security, window size is already set from HTML
 	video_mode = p_desired;
+	// can't fulfil fullscreen request due to browser security
 	video_mode.fullscreen = false;
-	_windowed_size = get_window_size();
+	set_window_size(Size2(p_desired.width, p_desired.height));
 
 	// find locale, emscripten only sets "C"
 	char locale_ptr[16];
@@ -835,10 +839,8 @@ int OS_JavaScript::get_power_percent_left() {
 	return power_manager->get_power_percent_left();
 }
 
-OS_JavaScript::OS_JavaScript(const char *p_execpath, GFXInitFunc p_gfx_init_func, void *p_gfx_init_ud, GetDataDirFunc p_get_data_dir_func) {
+OS_JavaScript::OS_JavaScript(const char *p_execpath, GetDataDirFunc p_get_data_dir_func) {
 	set_cmdline(p_execpath, get_cmdline_args());
-	gfx_init_func = p_gfx_init_func;
-	gfx_init_ud = p_gfx_init_ud;
 	main_loop = NULL;
 	gl_extensions = NULL;
 	window_maximized = false;
diff --git a/platform/javascript/os_javascript.h b/platform/javascript/os_javascript.h
index 0c956ecba6..dfc1a43226 100644
--- a/platform/javascript/os_javascript.h
+++ b/platform/javascript/os_javascript.h
@@ -45,16 +45,10 @@
 
 #include <emscripten/html5.h>
 
-typedef void (*GFXInitFunc)(void *ud, bool gl2, int w, int h, bool fs);
 typedef String (*GetDataDirFunc)();
 
 class OS_JavaScript : public OS_Unix {
 
-	GFXInitFunc gfx_init_func;
-	void *gfx_init_ud;
-
-	bool use_gl2;
-
 	int64_t time_to_save_sync;
 	int64_t last_sync_time;
 
@@ -167,7 +161,7 @@ public:
 	virtual int get_power_seconds_left();
 	virtual int get_power_percent_left();
 
-	OS_JavaScript(const char *p_execpath, GFXInitFunc p_gfx_init_func, void *p_gfx_init_ud, GetDataDirFunc p_get_data_dir_func);
+	OS_JavaScript(const char *p_execpath, GetDataDirFunc p_get_data_dir_func);
 	~OS_JavaScript();
 };