16 files changed, 100 insertions, 32 deletions

diff --git a/.github/workflows/javascript_builds.disabled b/.github/workflows/javascript_builds.yml
index 006981f3d4..b4e7d0f681 100644
--- a/.github/workflows/javascript_builds.disabled
+++ b/.github/workflows/javascript_builds.yml
@@ -4,9 +4,9 @@ on: [push, pull_request]
 # Global Settings
 env:
   GODOT_BASE_BRANCH: master
-  SCONSFLAGS: platform=javascript verbose=yes warnings=extra werror=yes debug_symbols=no --jobs=2
+  SCONSFLAGS: platform=javascript verbose=yes warnings=extra debug_symbols=no module_webxr_enabled=no --jobs=2
   SCONS_CACHE_LIMIT: 4096
-  EM_VERSION: 1.39.20
+  EM_VERSION: 2.0.25
   EM_CACHE_FOLDER: 'emsdk-cache'
 
 jobs:
@@ -62,7 +62,7 @@ jobs:
           scons --version
 
       - name: Set up Emscripten latest
-        uses: mymindstorm/setup-emsdk@v6
+        uses: mymindstorm/setup-emsdk@v10
         with:
           version: ${{env.EM_VERSION}}
           actions-cache-folder: ${{env.EM_CACHE_FOLDER}}
diff --git a/modules/webrtc/webrtc_peer_connection_js.cpp b/modules/webrtc/webrtc_peer_connection_js.cpp
index 8879f7d6ec..2b63e76358 100644
--- a/modules/webrtc/webrtc_peer_connection_js.cpp
+++ b/modules/webrtc/webrtc_peer_connection_js.cpp
@@ -34,7 +34,6 @@
 
 #include "webrtc_data_channel_js.h"
 
-#include "core/io/json.h"
 #include "emscripten.h"
 
 void WebRTCPeerConnectionJS::_on_ice_candidate(void *p_obj, const char *p_mid_name, int p_mline_idx, const char *p_candidate) {
@@ -100,7 +99,7 @@ Error WebRTCPeerConnectionJS::initialize(Dictionary p_config) {
 	}
 	_conn_state = STATE_NEW;
 
-	String config = JSON::print(p_config);
+	String config = Variant(p_config).to_json_string();
 	_js_id = godot_js_rtc_pc_create(config.utf8().get_data(), this, &_on_connection_state_changed, &_on_ice_candidate, &_on_data_channel);
 	return _js_id ? OK : FAILED;
 }
@@ -108,7 +107,7 @@ Error WebRTCPeerConnectionJS::initialize(Dictionary p_config) {
 Ref<WebRTCDataChannel> WebRTCPeerConnectionJS::create_data_channel(String p_channel, Dictionary p_channel_config) {
 	ERR_FAIL_COND_V(_conn_state != STATE_NEW, nullptr);
 
-	String config = JSON::print(p_channel_config);
+	String config = Variant(p_channel_config).to_json_string();
 	int id = godot_js_rtc_pc_datachannel_create(_js_id, p_channel.utf8().get_data(), config.utf8().get_data());
 	ERR_FAIL_COND_V(id == 0, nullptr);
 	return memnew(WebRTCDataChannelJS(id));
diff --git a/modules/webxr/webxr_interface_js.cpp b/modules/webxr/webxr_interface_js.cpp
index 2eab0cdb07..01cc05aa0b 100644
--- a/modules/webxr/webxr_interface_js.cpp
+++ b/modules/webxr/webxr_interface_js.cpp
@@ -202,8 +202,8 @@ int WebXRInterfaceJS::get_capabilities() const {
 	return XRInterface::XR_STEREO | XRInterface::XR_MONO;
 };
 
-bool WebXRInterfaceJS::is_stereo() {
-	return godot_webxr_get_view_count() == 2;
+uint32_t WebXRInterfaceJS::get_view_count() {
+	return godot_webxr_get_view_count();
 };
 
 bool WebXRInterfaceJS::is_initialized() const {
@@ -425,7 +425,7 @@ void WebXRInterfaceJS::_update_tracker(int p_controller_id) {
 		int *buttons = godot_webxr_get_controller_buttons(p_controller_id);
 		if (buttons) {
 			for (int i = 0; i < buttons[0]; i++) {
-				input->joy_button(p_controller_id + 100, i, *((float *)buttons + (i + 1)));
+				input->joy_button(p_controller_id + 100, (JoyButton)i, *((float *)buttons + (i + 1)));
 			}
 			free(buttons);
 		}
@@ -436,7 +436,7 @@ void WebXRInterfaceJS::_update_tracker(int p_controller_id) {
 				Input::JoyAxisValue joy_axis;
 				joy_axis.min = -1;
 				joy_axis.value = *((float *)axes + (i + 1));
-				input->joy_axis(p_controller_id + 100, i, joy_axis);
+				input->joy_axis(p_controller_id + 100, (JoyAxis)i, joy_axis);
 			}
 			free(axes);
 		}
diff --git a/modules/webxr/webxr_interface_js.h b/modules/webxr/webxr_interface_js.h
index 723ab952cd..3b5509adeb 100644
--- a/modules/webxr/webxr_interface_js.h
+++ b/modules/webxr/webxr_interface_js.h
@@ -83,7 +83,7 @@ public:
 	virtual void uninitialize() override;
 
 	virtual Size2 get_render_targetsize() override;
-	virtual bool is_stereo() override;
+	virtual uint32_t get_view_count() override;
 	virtual Transform3D get_camera_transform() override;
 	virtual Transform3D get_transform_for_view(uint32_t p_view, const Transform3D &p_cam_transform) override;
 	virtual CameraMatrix get_projection_for_view(uint32_t p_view, real_t p_aspect, real_t p_z_near, real_t p_z_far) override;
diff --git a/platform/javascript/detect.py b/platform/javascript/detect.py
index dacc442575..173b558b6d 100644
--- a/platform/javascript/detect.py
+++ b/platform/javascript/detect.py
@@ -38,7 +38,7 @@ def get_opts():
         BoolVariable("use_safe_heap", "Use Emscripten SAFE_HEAP sanitizer", False),
         # eval() can be a security concern, so it can be disabled.
         BoolVariable("javascript_eval", "Enable JavaScript eval interface", True),
-        BoolVariable("threads_enabled", "Enable WebAssembly Threads support (limited browser support)", False),
+        BoolVariable("threads_enabled", "Enable WebAssembly Threads support (limited browser support)", True),
         BoolVariable("gdnative_enabled", "Enable WebAssembly GDNative support (produces bigger binaries)", False),
         BoolVariable("use_closure_compiler", "Use closure compiler to minimize JavaScript code", False),
     ]
diff --git a/platform/javascript/display_server_javascript.cpp b/platform/javascript/display_server_javascript.cpp
index f1b92264e2..5e2b089c7f 100644
--- a/platform/javascript/display_server_javascript.cpp
+++ b/platform/javascript/display_server_javascript.cpp
@@ -229,7 +229,7 @@ EM_BOOL DisplayServerJavaScript::mouse_button_callback(int p_event_type, const E
 	}
 
 	Input *input = Input::get_singleton();
-	MouseButton mask = input->get_mouse_button_mask();
+	int mask = input->get_mouse_button_mask();
 	MouseButton button_flag = MouseButton(1 << (ev->get_button_index() - 1));
 	if (ev->is_pressed()) {
 		// Since the event is consumed, focus manually. The containing iframe,
@@ -605,17 +605,17 @@ void DisplayServerJavaScript::process_joypads() {
 				Input::JoyAxisValue joy_axis;
 				joy_axis.min = 0;
 				joy_axis.value = value;
-				int a = b == 6 ? JOY_AXIS_TRIGGER_LEFT : JOY_AXIS_TRIGGER_RIGHT;
+				JoyAxis a = b == 6 ? JOY_AXIS_TRIGGER_LEFT : JOY_AXIS_TRIGGER_RIGHT;
 				input->joy_axis(idx, a, joy_axis);
 			} else {
-				input->joy_button(idx, b, value);
+				input->joy_button(idx, (JoyButton)b, value);
 			}
 		}
 		for (int a = 0; a < s_axes_num; a++) {
 			Input::JoyAxisValue joy_axis;
 			joy_axis.min = -1;
 			joy_axis.value = s_axes[a];
-			input->joy_axis(idx, a, joy_axis);
+			input->joy_axis(idx, (JoyAxis)a, joy_axis);
 		}
 	}
 }
@@ -710,18 +710,18 @@ void DisplayServerJavaScript::_dispatch_input_event(const Ref<InputEvent> &p_eve
 	}
 }
 
-DisplayServer *DisplayServerJavaScript::create_func(const String &p_rendering_driver, DisplayServer::WindowMode p_mode, uint32_t p_flags, const Vector2i &p_resolution, Error &r_error) {
-	return memnew(DisplayServerJavaScript(p_rendering_driver, p_mode, p_flags, p_resolution, r_error));
+DisplayServer *DisplayServerJavaScript::create_func(const String &p_rendering_driver, WindowMode p_window_mode, VSyncMode p_vsync_mode, uint32_t p_flags, const Size2i &p_resolution, Error &r_error) {
+	return memnew(DisplayServerJavaScript(p_rendering_driver, p_window_mode, p_vsync_mode, p_flags, p_resolution, r_error));
 }
 
-DisplayServerJavaScript::DisplayServerJavaScript(const String &p_rendering_driver, WindowMode p_mode, uint32_t p_flags, const Vector2i &p_resolution, Error &r_error) {
+DisplayServerJavaScript::DisplayServerJavaScript(const String &p_rendering_driver, WindowMode p_window_mode, VSyncMode p_vsync_mode, uint32_t p_flags, const Size2i &p_resolution, Error &r_error) {
 	r_error = OK; // Always succeeds for now.
 
 	// Ensure the canvas ID.
 	godot_js_config_canvas_id_get(canvas_id, 256);
 
 	// Handle contextmenu, webglcontextlost
-	godot_js_display_setup_canvas(p_resolution.x, p_resolution.y, p_mode == WINDOW_MODE_FULLSCREEN, OS::get_singleton()->is_hidpi_allowed() ? 1 : 0);
+	godot_js_display_setup_canvas(p_resolution.x, p_resolution.y, p_window_mode == WINDOW_MODE_FULLSCREEN, OS::get_singleton()->is_hidpi_allowed() ? 1 : 0);
 
 	// Check if it's windows.
 	swap_cancel_ok = godot_js_display_is_swap_ok_cancel() == 1;
diff --git a/platform/javascript/display_server_javascript.h b/platform/javascript/display_server_javascript.h
index ece38f1a95..3cad7e16a2 100644
--- a/platform/javascript/display_server_javascript.h
+++ b/platform/javascript/display_server_javascript.h
@@ -89,7 +89,7 @@ private:
 	void process_joypads();
 
 	static Vector<String> get_rendering_drivers_func();
-	static DisplayServer *create_func(const String &p_rendering_driver, DisplayServer::WindowMode p_mode, uint32_t p_flags, const Vector2i &p_resolution, Error &r_error);
+	static DisplayServer *create_func(const String &p_rendering_driver, WindowMode p_window_mode, VSyncMode p_vsync_mode, uint32_t p_flags, const Vector2i &p_resolution, Error &r_error);
 
 	static void _dispatch_input_event(const Ref<InputEvent> &p_event);
 
@@ -201,7 +201,7 @@ public:
 	void swap_buffers() override;
 
 	static void register_javascript_driver();
-	DisplayServerJavaScript(const String &p_rendering_driver, WindowMode p_mode, uint32_t p_flags, const Vector2i &p_resolution, Error &r_error);
+	DisplayServerJavaScript(const String &p_rendering_driver, WindowMode p_window_mode, VSyncMode p_vsync_mode, uint32_t p_flags, const Size2i &p_resolution, Error &r_error);
 	~DisplayServerJavaScript();
 };
 
diff --git a/platform/javascript/os_javascript.cpp b/platform/javascript/os_javascript.cpp
index 92b8b70508..260bfad7a5 100644
--- a/platform/javascript/os_javascript.cpp
+++ b/platform/javascript/os_javascript.cpp
@@ -31,7 +31,6 @@
 #include "os_javascript.h"
 
 #include "core/debugger/engine_debugger.h"
-#include "core/io/json.h"
 #include "drivers/unix/dir_access_unix.h"
 #include "drivers/unix/file_access_unix.h"
 #include "main/main.h"
@@ -115,7 +114,7 @@ Error OS_JavaScript::create_process(const String &p_path, const List<String> &p_
 	for (const List<String>::Element *E = p_arguments.front(); E; E = E->next()) {
 		args.push_back(E->get());
 	}
-	String json_args = JSON::print(args);
+	String json_args = Variant(args).to_json_string();
 	int failed = godot_js_os_execute(json_args.utf8().get_data());
 	ERR_FAIL_COND_V_MSG(failed, ERR_UNAVAILABLE, "OS::execute() or create_process() must be implemented in JavaScript via 'engine.setOnExecute' if required.");
 	return OK;
diff --git a/servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.cpp b/servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.cpp
index 29cb597798..03419ec8f5 100644
--- a/servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.cpp
+++ b/servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.cpp
@@ -65,9 +65,13 @@ void RenderForwardMobile::RenderBufferDataForwardMobile::configure(RID p_color_b
 	color = p_color_buffer;
 	depth = p_depth_buffer;
 
-	// re-introduce setting up msaa? For now we ignore this...
+	RD::DataFormat color_format = RenderForwardMobile::singleton->_render_buffers_get_color_format();
 
 	if (p_msaa == RS::VIEWPORT_MSAA_DISABLED) {
+		if (color_format == RD::DATA_FORMAT_B10G11R11_UFLOAT_PACK32) {
+			// @TODO add a second color buffer for alpha as this format is RGB only
+		}
+
 		Vector<RID> fb;
 		fb.push_back(p_color_buffer);
 		fb.push_back(depth);
@@ -80,7 +84,7 @@ void RenderForwardMobile::RenderBufferDataForwardMobile::configure(RID p_color_b
 		} else {
 			tf.texture_type = RD::TEXTURE_TYPE_2D;
 		}
-		tf.format = RD::DATA_FORMAT_R16G16B16A16_SFLOAT;
+		tf.format = color_format;
 		tf.width = p_width;
 		tf.height = p_height;
 		tf.array_layers = view_count; // create a layer for every view
@@ -131,6 +135,13 @@ bool RenderForwardMobile::free(RID p_rid) {
 
 /* Render functions */
 
+RD::DataFormat RenderForwardMobile::_render_buffers_get_color_format() {
+	// Using 32bit buffers enables AFBC on mobile devices which should have a definate performance improvement (MALI G710 and newer support this on 64bit RTs)
+	// NO ALPHA and unsigned float.
+	// @TODO No alpha is an issue, recommendation here is to add a second RT for alpha
+	return RD::DATA_FORMAT_B10G11R11_UFLOAT_PACK32;
+}
+
 RID RenderForwardMobile::_setup_render_pass_uniform_set(RenderListType p_render_list, const RenderDataRD *p_render_data, RID p_radiance_texture, bool p_use_directional_shadow_atlas, int p_index) {
 	//there should always be enough uniform buffers for render passes, otherwise bugs
 	ERR_FAIL_INDEX_V(p_index, (int)scene_state.uniform_buffers.size(), RID());
diff --git a/servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.h b/servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.h
index 53650a7a5e..bf3aa7ed5c 100644
--- a/servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.h
+++ b/servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.h
@@ -151,6 +151,8 @@ protected:
 		}
 	};
 
+	virtual RD::DataFormat _render_buffers_get_color_format() override;
+
 	RID _setup_render_pass_uniform_set(RenderListType p_render_list, const RenderDataRD *p_render_data, RID p_radiance_texture, bool p_use_directional_shadow_atlas = false, int p_index = 0);
 	virtual void _render_scene(RenderDataRD *p_render_data, const Color &p_default_bg_color) override;
 
diff --git a/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp b/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp
index 3b7c14d4ff..9b32971e30 100644
--- a/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp
+++ b/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp
@@ -654,7 +654,7 @@ bool RendererSceneRenderRD::reflection_probe_instance_begin_render(RID p_instanc
 			//reflection atlas was unused, create:
 			RD::TextureFormat tf;
 			tf.array_layers = 6 * atlas->count;
-			tf.format = RD::DATA_FORMAT_R16G16B16A16_SFLOAT;
+			tf.format = _render_buffers_get_color_format();
 			tf.texture_type = RD::TEXTURE_TYPE_CUBE_ARRAY;
 			tf.mipmaps = mipmaps;
 			tf.width = atlas->size;
@@ -2118,6 +2118,10 @@ float RendererSceneRenderRD::render_buffers_get_volumetric_fog_detail_spread(RID
 	return rb->volumetric_fog->spread;
 }
 
+RD::DataFormat RendererSceneRenderRD::_render_buffers_get_color_format() {
+	return RD::DATA_FORMAT_R16G16B16A16_SFLOAT;
+}
+
 void RendererSceneRenderRD::render_buffers_configure(RID p_render_buffers, RID p_render_target, int p_width, int p_height, RS::ViewportMSAA p_msaa, RenderingServer::ViewportScreenSpaceAA p_screen_space_aa, bool p_use_debanding, uint32_t p_view_count) {
 	ERR_FAIL_COND_MSG(p_view_count == 0, "Must have atleast 1 view");
 
@@ -2144,7 +2148,7 @@ void RendererSceneRenderRD::render_buffers_configure(RID p_render_buffers, RID p
 		if (rb->view_count > 1) {
 			tf.texture_type = RD::TEXTURE_TYPE_2D_ARRAY;
 		}
-		tf.format = RD::DATA_FORMAT_R16G16B16A16_SFLOAT;
+		tf.format = _render_buffers_get_color_format();
 		tf.width = rb->width;
 		tf.height = rb->height;
 		tf.array_layers = rb->view_count; // create a layer for every view
diff --git a/servers/rendering/renderer_rd/renderer_scene_render_rd.h b/servers/rendering/renderer_rd/renderer_scene_render_rd.h
index 69c56cf4a7..58d9a765d0 100644
--- a/servers/rendering/renderer_rd/renderer_scene_render_rd.h
+++ b/servers/rendering/renderer_rd/renderer_scene_render_rd.h
@@ -1130,6 +1130,7 @@ public:
 
 	/* render buffers */
 
+	virtual RD::DataFormat _render_buffers_get_color_format();
 	virtual RID render_buffers_create() override;
 	virtual void render_buffers_configure(RID p_render_buffers, RID p_render_target, int p_width, int p_height, RS::ViewportMSAA p_msaa, RS::ViewportScreenSpaceAA p_screen_space_aa, bool p_use_debanding, uint32_t p_view_count) override;
 	virtual void gi_set_use_half_resolution(bool p_enable) override;
diff --git a/servers/rendering/shader_language.cpp b/servers/rendering/shader_language.cpp
index 9b2ba36358..f771d6d0ef 100644
--- a/servers/rendering/shader_language.cpp
+++ b/servers/rendering/shader_language.cpp
@@ -918,6 +918,7 @@ void ShaderLanguage::clear() {
 	used_uniforms.clear();
 	used_functions.clear();
 	used_structs.clear();
+	used_local_vars.clear();
 	warnings.clear();
 #endif // DEBUG_ENABLED
 
@@ -936,7 +937,7 @@ void ShaderLanguage::clear() {
 }
 
 #ifdef DEBUG_ENABLED
-void ShaderLanguage::_parse_used_identifier(const StringName &p_identifier, IdentifierType p_type) {
+void ShaderLanguage::_parse_used_identifier(const StringName &p_identifier, IdentifierType p_type, const StringName &p_function) {
 	switch (p_type) {
 		case IdentifierType::IDENTIFIER_CONSTANT:
 			if (HAS_WARNING(ShaderWarning::UNUSED_CONSTANT_FLAG) && used_constants.has(p_identifier)) {
@@ -958,6 +959,11 @@ void ShaderLanguage::_parse_used_identifier(const StringName &p_identifier, Iden
 				used_functions[p_identifier].used = true;
 			}
 			break;
+		case IdentifierType::IDENTIFIER_LOCAL_VAR:
+			if (HAS_WARNING(ShaderWarning::UNUSED_LOCAL_VARIABLE_FLAG) && used_local_vars.has(p_function) && used_local_vars[p_function].has(p_identifier)) {
+				used_local_vars[p_function][p_identifier].used = true;
+			}
+			break;
 		default:
 			break;
 	}
@@ -4171,7 +4177,13 @@ ShaderLanguage::Node *ShaderLanguage::_parse_expression(BlockNode *p_block, cons
 					expr = func;
 #ifdef DEBUG_ENABLED
 					if (check_warnings) {
-						_parse_used_identifier(name, IdentifierType::IDENTIFIER_FUNCTION);
+						StringName func_name;
+
+						if (p_block && p_block->parent_function) {
+							func_name = p_block->parent_function->name;
+						}
+
+						_parse_used_identifier(name, IdentifierType::IDENTIFIER_FUNCTION, func_name);
 					}
 #endif // DEBUG_ENABLED
 				}
@@ -4319,7 +4331,13 @@ ShaderLanguage::Node *ShaderLanguage::_parse_expression(BlockNode *p_block, cons
 				}
 #ifdef DEBUG_ENABLED
 				if (check_warnings) {
-					_parse_used_identifier(identifier, ident_type);
+					StringName func_name;
+
+					if (p_block && p_block->parent_function) {
+						func_name = p_block->parent_function->name;
+					}
+
+					_parse_used_identifier(identifier, ident_type, func_name);
 				}
 #endif // DEBUG_ENABLED
 			}
@@ -5537,6 +5555,20 @@ Error ShaderLanguage::_parse_block(BlockNode *p_block, const FunctionInfo &p_fun
 					}
 				}
 
+#ifdef DEBUG_ENABLED
+				if (check_warnings && HAS_WARNING(ShaderWarning::UNUSED_LOCAL_VARIABLE_FLAG)) {
+					if (p_block && p_block->parent_function) {
+						StringName func_name = p_block->parent_function->name;
+
+						if (!used_local_vars.has(func_name)) {
+							used_local_vars.insert(func_name, Map<StringName, Usage>());
+						}
+
+						used_local_vars[func_name].insert(name, Usage(tk_line));
+					}
+				}
+#endif // DEBUG_ENABLED
+
 				BlockNode::Variable var;
 				var.type = type;
 				var.precision = precision;
@@ -7984,6 +8016,15 @@ String ShaderLanguage::get_shader_type(const String &p_code) {
 
 #ifdef DEBUG_ENABLED
 void ShaderLanguage::_check_warning_accums() {
+	for (Map<ShaderWarning::Code, Map<StringName, Map<StringName, Usage>> *>::Element *E = warnings_check_map2.front(); E; E = E->next()) {
+		for (Map<StringName, Map<StringName, Usage>>::Element *T = (*E->get()).front(); T; T = T->next()) {
+			for (const Map<StringName, Usage>::Element *U = T->get().front(); U; U = U->next()) {
+				if (!U->get().used) {
+					_add_warning(E->key(), U->get().decl_line, U->key());
+				}
+			}
+		}
+	}
 	for (Map<ShaderWarning::Code, Map<StringName, Usage> *>::Element *E = warnings_check_map.front(); E; E = E->next()) {
 		for (const Map<StringName, Usage>::Element *U = (*E->get()).front(); U; U = U->next()) {
 			if (!U->get().used) {
@@ -8456,6 +8497,8 @@ ShaderLanguage::ShaderLanguage() {
 	warnings_check_map.insert(ShaderWarning::UNUSED_STRUCT, &used_structs);
 	warnings_check_map.insert(ShaderWarning::UNUSED_UNIFORM, &used_uniforms);
 	warnings_check_map.insert(ShaderWarning::UNUSED_VARYING, &used_varyings);
+
+	warnings_check_map2.insert(ShaderWarning::UNUSED_LOCAL_VARIABLE, &used_local_vars);
 #endif // DEBUG_ENABLED
 }
 
diff --git a/servers/rendering/shader_language.h b/servers/rendering/shader_language.h
index 4120e04ee1..a91fa57a8e 100644
--- a/servers/rendering/shader_language.h
+++ b/servers/rendering/shader_language.h
@@ -848,6 +848,9 @@ private:
 	Map<StringName, Usage> used_structs;
 	Map<ShaderWarning::Code, Map<StringName, Usage> *> warnings_check_map;
 
+	Map<StringName, Map<StringName, Usage>> used_local_vars;
+	Map<ShaderWarning::Code, Map<StringName, Map<StringName, Usage>> *> warnings_check_map2;
+
 	List<ShaderWarning> warnings;
 
 	bool check_warnings = false;
@@ -917,7 +920,7 @@ private:
 
 	bool _find_identifier(const BlockNode *p_block, bool p_allow_reassign, const FunctionInfo &p_function_info, const StringName &p_identifier, DataType *r_data_type = nullptr, IdentifierType *r_type = nullptr, bool *r_is_const = nullptr, int *r_array_size = nullptr, StringName *r_struct_name = nullptr, ConstantNode::Value *r_constant_value = nullptr);
 #ifdef DEBUG_ENABLED
-	void _parse_used_identifier(const StringName &p_identifier, IdentifierType p_type);
+	void _parse_used_identifier(const StringName &p_identifier, IdentifierType p_type, const StringName &p_function);
 #endif // DEBUG_ENABLED
 	bool _is_operator_assign(Operator p_op) const;
 	bool _validate_assign(Node *p_node, const FunctionInfo &p_function_info, String *r_message = nullptr);
diff --git a/servers/rendering/shader_warnings.cpp b/servers/rendering/shader_warnings.cpp
index aa11b4e397..0c1d6408c9 100644
--- a/servers/rendering/shader_warnings.cpp
+++ b/servers/rendering/shader_warnings.cpp
@@ -59,6 +59,8 @@ String ShaderWarning::get_message() const {
 			return vformat("The uniform '%s' is declared but never used.", subject);
 		case UNUSED_VARYING:
 			return vformat("The varying '%s' is declared but never used.", subject);
+		case UNUSED_LOCAL_VARIABLE:
+			return vformat("The local variable '%s' is declared but never used.", subject);
 		default:
 			break;
 	}
@@ -79,6 +81,7 @@ String ShaderWarning::get_name_from_code(Code p_code) {
 		"UNUSED_STRUCT",
 		"UNUSED_UNIFORM",
 		"UNUSED_VARYING",
+		"UNUSED_LOCAL_VARIABLE",
 	};
 
 	static_assert((sizeof(names) / sizeof(*names)) == WARNING_MAX, "Amount of warning types don't match the amount of warning names.");
@@ -106,6 +109,7 @@ static void init_code_to_flags_map() {
 	code_to_flags_map->insert(ShaderWarning::UNUSED_STRUCT, ShaderWarning::UNUSED_STRUCT_FLAG);
 	code_to_flags_map->insert(ShaderWarning::UNUSED_UNIFORM, ShaderWarning::UNUSED_UNIFORM_FLAG);
 	code_to_flags_map->insert(ShaderWarning::UNUSED_VARYING, ShaderWarning::UNUSED_VARYING_FLAG);
+	code_to_flags_map->insert(ShaderWarning::UNUSED_LOCAL_VARIABLE, ShaderWarning::UNUSED_LOCAL_VARIABLE_FLAG);
 }
 
 ShaderWarning::CodeFlags ShaderWarning::get_flags_from_codemap(const Map<Code, bool> &p_map) {
diff --git a/servers/rendering/shader_warnings.h b/servers/rendering/shader_warnings.h
index c40aeefa2d..db872d8fb1 100644
--- a/servers/rendering/shader_warnings.h
+++ b/servers/rendering/shader_warnings.h
@@ -46,6 +46,7 @@ public:
 		UNUSED_STRUCT,
 		UNUSED_UNIFORM,
 		UNUSED_VARYING,
+		UNUSED_LOCAL_VARIABLE,
 		WARNING_MAX,
 	};
 
@@ -57,6 +58,7 @@ public:
 		UNUSED_STRUCT_FLAG = 8U,
 		UNUSED_UNIFORM_FLAG = 16U,
 		UNUSED_VARYING_FLAG = 32U,
+		UNUSED_LOCAL_VARIABLE_FLAG = 64U,
 	};
 
 private: