Fix HTML5 feature tags

'HTML5' is the platform tag, the 'JavaScript' tag indicates availability of
the JavaScript.eval singleton.

Also report texture compression support.

3 files changed, 21 insertions, 13 deletions

diff --git a/platform/javascript/export/export.cpp b/platform/javascript/export/export.cpp
index 61f55beb4e..905bb9ae24 100644
--- a/platform/javascript/export/export.cpp
+++ b/platform/javascript/export/export.cpp
@@ -71,7 +71,7 @@ public:
 	virtual void get_platform_features(List<String> *r_features) {
 
 		r_features->push_back("web");
-		r_features->push_back("JavaScript");
+		r_features->push_back(get_os_name());
 	}
 
 	EditorExportPlatformJavaScript();
@@ -130,7 +130,7 @@ String EditorExportPlatformJavaScript::get_name() const {
 
 String EditorExportPlatformJavaScript::get_os_name() const {
 
-	return "JavaScript";
+	return "HTML5";
 }
 
 Ref<Texture> EditorExportPlatformJavaScript::get_logo() const {
diff --git a/platform/javascript/os_javascript.cpp b/platform/javascript/os_javascript.cpp
index b10ef821dd..3590c30579 100644
--- a/platform/javascript/os_javascript.cpp
+++ b/platform/javascript/os_javascript.cpp
@@ -81,12 +81,6 @@ void OS_JavaScript::initialize_core() {
 	FileAccess::make_default<FileAccessBufferedFA<FileAccessUnix> >(FileAccess::ACCESS_RESOURCES);
 }
 
-void OS_JavaScript::set_opengl_extensions(const char *p_gl_extensions) {
-
-	ERR_FAIL_COND(!p_gl_extensions);
-	gl_extensions = p_gl_extensions;
-}
-
 static EM_BOOL _browser_resize_callback(int event_type, const EmscriptenUiEvent *ui_event, void *user_data) {
 
 	ERR_FAIL_COND_V(event_type != EMSCRIPTEN_EVENT_RESIZE, false);
@@ -975,7 +969,25 @@ int OS_JavaScript::get_power_percent_left() {
 
 bool OS_JavaScript::_check_internal_feature_support(const String &p_feature) {
 
-	return p_feature == "web" || p_feature == "s3tc"; // TODO check for these features really being available
+	if (p_feature == "HTML5" || p_feature == "web")
+		return true;
+
+#ifdef JAVASCRIPT_EVAL_ENABLED
+	if (p_feature == "JavaScript")
+		return true;
+#endif
+
+	EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx = emscripten_webgl_get_current_context();
+	// all extensions are already automatically enabled, this function allows
+	// checking WebGL extension support without inline JavaScript
+	if (p_feature == "s3tc" && emscripten_webgl_enable_extension(ctx, "WEBGL_compressed_texture_s3tc_srgb"))
+		return true;
+	if (p_feature == "etc" && emscripten_webgl_enable_extension(ctx, "WEBGL_compressed_texture_etc1"))
+		return true;
+	if (p_feature == "etc2" && emscripten_webgl_enable_extension(ctx, "WEBGL_compressed_texture_etc"))
+		return true;
+
+	return false;
 }
 
 void OS_JavaScript::set_idbfs_available(bool p_idbfs_available) {
@@ -992,7 +1004,6 @@ OS_JavaScript::OS_JavaScript(const char *p_execpath, GetUserDataDirFunc p_get_us
 
 	set_cmdline(p_execpath, get_cmdline_args());
 	main_loop = NULL;
-	gl_extensions = NULL;
 	window_maximized = false;
 	soft_fs_enabled = false;
 	canvas_size_adjustment_requested = false;
diff --git a/platform/javascript/os_javascript.h b/platform/javascript/os_javascript.h
index ce4763ab64..f0ba9422e8 100644
--- a/platform/javascript/os_javascript.h
+++ b/platform/javascript/os_javascript.h
@@ -52,7 +52,6 @@ class OS_JavaScript : public OS_Unix {
 
 	VisualServer *visual_server;
 	AudioDriverJavaScript audio_driver_javascript;
-	const char *gl_extensions;
 
 	InputDefault *input;
 	Vector2 windowed_size;
@@ -139,8 +138,6 @@ public:
 
 	virtual bool has_touchscreen_ui_hint() const;
 
-	void set_opengl_extensions(const char *p_gl_extensions);
-
 	virtual Error shell_open(String p_uri);
 	virtual String get_user_data_dir() const;
 	String get_executable_path() const;