Add screen space AA option, with FXAA implementation.

15 files changed, 144 insertions, 10 deletions

diff --git a/editor/plugins/node_3d_editor_plugin.cpp b/editor/plugins/node_3d_editor_plugin.cpp
index 7ba38036ac..82353dbb93 100644
--- a/editor/plugins/node_3d_editor_plugin.cpp
+++ b/editor/plugins/node_3d_editor_plugin.cpp
@@ -2480,6 +2480,8 @@ void Node3DEditorViewport::_notification(int p_what) {
 
 		int msaa_mode = ProjectSettings::get_singleton()->get("rendering/quality/filters/msaa");
 		viewport->set_msaa(Viewport::MSAA(msaa_mode));
+		int ssaa_mode = GLOBAL_GET("rendering/quality/filters/screen_space_aa");
+		viewport->set_screen_space_aa(Viewport::ScreenSpaceAA(ssaa_mode));
 
 		bool show_info = view_menu->get_popup()->is_item_checked(view_menu->get_popup()->get_item_index(VIEW_INFORMATION));
 		if (show_info != info_label->is_visible()) {
diff --git a/scene/main/scene_tree.cpp b/scene/main/scene_tree.cpp
index 41f31617d2..ff00de4954 100644
--- a/scene/main/scene_tree.cpp
+++ b/scene/main/scene_tree.cpp
@@ -1425,6 +1425,10 @@ SceneTree::SceneTree() {
 	ProjectSettings::get_singleton()->set_custom_property_info("rendering/quality/filters/msaa", PropertyInfo(Variant::INT, "rendering/quality/filters/msaa", PROPERTY_HINT_ENUM, "Disabled,2x,4x,8x,16x,AndroidVR 2x,AndroidVR 4x"));
 	root->set_msaa(Viewport::MSAA(msaa_mode));
 
+	int ssaa_mode = GLOBAL_DEF("rendering/quality/filters/screen_space_aa", 0);
+	ProjectSettings::get_singleton()->set_custom_property_info("rendering/quality/filters/screen_space_aa", PropertyInfo(Variant::INT, "rendering/quality/filters/screen_space_aa", PROPERTY_HINT_ENUM, "Disabled,FXAA"));
+	root->set_screen_space_aa(Viewport::ScreenSpaceAA(ssaa_mode));
+
 	{ //load default fallback environment
 		//get possible extensions
 		List<String> exts;
diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index 1cfc3b0260..a3036da870 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -3173,7 +3173,7 @@ int Viewport::gui_get_canvas_sort_index() {
 
 void Viewport::set_msaa(MSAA p_msaa) {
 
-	ERR_FAIL_INDEX(p_msaa, 7);
+	ERR_FAIL_INDEX(p_msaa, MSAA_MAX);
 	if (msaa == p_msaa)
 		return;
 	msaa = p_msaa;
@@ -3185,6 +3185,19 @@ Viewport::MSAA Viewport::get_msaa() const {
 	return msaa;
 }
 
+void Viewport::set_screen_space_aa(ScreenSpaceAA p_screen_space_aa) {
+
+	ERR_FAIL_INDEX(p_screen_space_aa, SCREEN_SPACE_AA_MAX);
+	if (screen_space_aa == p_screen_space_aa)
+		return;
+	screen_space_aa = p_screen_space_aa;
+	RS::get_singleton()->viewport_set_screen_space_aa(viewport, RS::ViewportScreenSpaceAA(p_screen_space_aa));
+}
+
+Viewport::ScreenSpaceAA Viewport::get_screen_space_aa() const {
+
+	return screen_space_aa;
+}
 void Viewport::set_debug_draw(DebugDraw p_debug_draw) {
 
 	debug_draw = p_debug_draw;
@@ -3371,6 +3384,9 @@ void Viewport::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_msaa", "msaa"), &Viewport::set_msaa);
 	ClassDB::bind_method(D_METHOD("get_msaa"), &Viewport::get_msaa);
 
+	ClassDB::bind_method(D_METHOD("set_screen_space_aa", "screen_space_aa"), &Viewport::set_screen_space_aa);
+	ClassDB::bind_method(D_METHOD("get_screen_space_aa"), &Viewport::get_screen_space_aa);
+
 	ClassDB::bind_method(D_METHOD("set_debug_draw", "debug_draw"), &Viewport::set_debug_draw);
 	ClassDB::bind_method(D_METHOD("get_debug_draw"), &Viewport::get_debug_draw);
 
@@ -3444,6 +3460,7 @@ void Viewport::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "handle_input_locally"), "set_handle_input_locally", "is_handling_input_locally");
 	ADD_GROUP("Rendering", "");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "msaa", PROPERTY_HINT_ENUM, "Disabled,2x,4x,8x,16x,AndroidVR 2x,AndroidVR 4x"), "set_msaa", "get_msaa");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "screen_space_aa", PROPERTY_HINT_ENUM, "Disabled,FXAA"), "set_screen_space_aa", "get_screen_space_aa");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "debug_draw", PROPERTY_HINT_ENUM, "Disabled,Unshaded,Overdraw,Wireframe"), "set_debug_draw", "get_debug_draw");
 	ADD_GROUP("Canvas Items", "canvas_item_");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "canvas_item_default_texture_filter", PROPERTY_HINT_ENUM, "Nearest,Linear,MipmapLinear,MipmapNearest"), "set_default_canvas_item_texture_filter", "get_default_canvas_item_texture_filter");
@@ -3586,7 +3603,7 @@ Viewport::Viewport() {
 	gui.subwindow_drag = SUB_WINDOW_DRAG_DISABLED;
 
 	msaa = MSAA_DISABLED;
-
+	screen_space_aa = SCREEN_SPACE_AA_DISABLED;
 	debug_draw = DEBUG_DRAW_DISABLED;
 
 	snap_controls_to_pixels = true;
diff --git a/scene/main/viewport.h b/scene/main/viewport.h
index ab3987d16d..0cd7f6fdaa 100644
--- a/scene/main/viewport.h
+++ b/scene/main/viewport.h
@@ -106,6 +106,13 @@ public:
 		MSAA_4X,
 		MSAA_8X,
 		MSAA_16X,
+		MSAA_MAX
+	};
+
+	enum ScreenSpaceAA {
+		SCREEN_SPACE_AA_DISABLED,
+		SCREEN_SPACE_AA_FXAA,
+		SCREEN_SPACE_AA_MAX
 	};
 
 	enum RenderInfo {
@@ -272,6 +279,7 @@ private:
 	ShadowAtlasQuadrantSubdiv shadow_atlas_quadrant_subdiv[4];
 
 	MSAA msaa;
+	ScreenSpaceAA screen_space_aa;
 	Ref<ViewportTexture> default_texture;
 	Set<ViewportTexture *> viewport_textures;
 
@@ -505,6 +513,9 @@ public:
 	void set_msaa(MSAA p_msaa);
 	MSAA get_msaa() const;
 
+	void set_screen_space_aa(ScreenSpaceAA p_screen_space_aa);
+	ScreenSpaceAA get_screen_space_aa() const;
+
 	Vector2 get_camera_coords(const Vector2 &p_viewport_coords) const;
 	Vector2 get_camera_rect_size() const;
 
@@ -624,6 +635,7 @@ public:
 VARIANT_ENUM_CAST(SubViewport::UpdateMode);
 VARIANT_ENUM_CAST(Viewport::ShadowAtlasQuadrantSubdiv);
 VARIANT_ENUM_CAST(Viewport::MSAA);
+VARIANT_ENUM_CAST(Viewport::ScreenSpaceAA);
 VARIANT_ENUM_CAST(Viewport::DebugDraw);
 VARIANT_ENUM_CAST(SubViewport::ClearMode);
 VARIANT_ENUM_CAST(Viewport::RenderInfo);
diff --git a/servers/rendering/rasterizer.h b/servers/rendering/rasterizer.h
index cf0afe6097..37392c282d 100644
--- a/servers/rendering/rasterizer.h
+++ b/servers/rendering/rasterizer.h
@@ -263,7 +263,7 @@ public:
 	virtual void set_debug_draw_mode(RS::ViewportDebugDraw p_debug_draw) = 0;
 
 	virtual RID render_buffers_create() = 0;
-	virtual void render_buffers_configure(RID p_render_buffers, RID p_render_target, int p_width, int p_height, RS::ViewportMSAA p_msaa) = 0;
+	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) = 0;
 
 	virtual void screen_space_roughness_limiter_set_active(bool p_enable, float p_curve) = 0;
 	virtual bool screen_space_roughness_limiter_is_active() const = 0;
diff --git a/servers/rendering/rasterizer_rd/rasterizer_effects_rd.cpp b/servers/rendering/rasterizer_rd/rasterizer_effects_rd.cpp
index 973b422b14..c34eb4cd79 100644
--- a/servers/rendering/rasterizer_rd/rasterizer_effects_rd.cpp
+++ b/servers/rendering/rasterizer_rd/rasterizer_effects_rd.cpp
@@ -676,6 +676,10 @@ void RasterizerEffectsRD::tonemapper(RID p_source_color, RID p_dst_framebuffer,
 
 	tonemap.push_constant.use_color_correction = p_settings.use_color_correction;
 
+	tonemap.push_constant.use_fxaa = p_settings.use_fxaa;
+	tonemap.push_constant.pixel_size[0] = 1.0 / p_settings.texture_size.x;
+	tonemap.push_constant.pixel_size[1] = 1.0 / p_settings.texture_size.y;
+
 	RD::DrawListID draw_list = RD::get_singleton()->draw_list_begin(p_dst_framebuffer, RD::INITIAL_ACTION_DROP, RD::FINAL_ACTION_READ, RD::INITIAL_ACTION_DROP, RD::FINAL_ACTION_DISCARD);
 	RD::get_singleton()->draw_list_bind_render_pipeline(draw_list, tonemap.pipelines[mode].get_render_pipeline(RD::INVALID_ID, RD::get_singleton()->framebuffer_get_format(p_dst_framebuffer)));
 	RD::get_singleton()->draw_list_bind_uniform_set(draw_list, _get_uniform_set_from_texture(p_source_color), 0);
diff --git a/servers/rendering/rasterizer_rd/rasterizer_effects_rd.h b/servers/rendering/rasterizer_rd/rasterizer_effects_rd.h
index 64e16a58a6..aec381d193 100644
--- a/servers/rendering/rasterizer_rd/rasterizer_effects_rd.h
+++ b/servers/rendering/rasterizer_rd/rasterizer_effects_rd.h
@@ -170,6 +170,10 @@ class RasterizerEffectsRD {
 		float exposure;
 		float white;
 		float auto_exposure_grey;
+
+		float pixel_size[2];
+		uint32_t use_fxaa;
+		uint32_t pad;
 	};
 
 	/* tonemap actually writes to a framebuffer, which is
@@ -595,6 +599,9 @@ public:
 
 		bool use_color_correction = false;
 		RID color_correction_texture;
+
+		bool use_fxaa = false;
+		Vector2i texture_size;
 	};
 
 	void tonemapper(RID p_source_color, RID p_dst_framebuffer, const TonemapSettings &p_settings);
diff --git a/servers/rendering/rasterizer_rd/rasterizer_scene_rd.cpp b/servers/rendering/rasterizer_rd/rasterizer_scene_rd.cpp
index 2426eb7ebe..c558cc8d15 100644
--- a/servers/rendering/rasterizer_rd/rasterizer_scene_rd.cpp
+++ b/servers/rendering/rasterizer_rd/rasterizer_scene_rd.cpp
@@ -3439,6 +3439,12 @@ void RasterizerSceneRD::_render_buffers_post_process_and_tonemap(RID p_render_bu
 			tonemap.glow_texture = storage->texture_rd_get_default(RasterizerStorageRD::DEFAULT_RD_TEXTURE_BLACK);
 		}
 
+		if (rb->screen_space_aa == RS::VIEWPORT_SCREEN_SPACE_AA_FXAA) {
+			tonemap.use_fxaa = true;
+		}
+
+		tonemap.texture_size = Vector2i(rb->width, rb->height);
+
 		if (env) {
 			tonemap.tonemap_mode = env->tone_mapper;
 			tonemap.white = env->white;
@@ -3517,13 +3523,14 @@ RID RasterizerSceneRD::render_buffers_get_ao_texture(RID p_render_buffers) {
 	return rb->ssao.ao_full.is_valid() ? rb->ssao.ao_full : rb->ssao.ao[0];
 }
 
-void RasterizerSceneRD::render_buffers_configure(RID p_render_buffers, RID p_render_target, int p_width, int p_height, RS::ViewportMSAA p_msaa) {
+void RasterizerSceneRD::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) {
 
 	RenderBuffers *rb = render_buffers_owner.getornull(p_render_buffers);
 	rb->width = p_width;
 	rb->height = p_height;
 	rb->render_target = p_render_target;
 	rb->msaa = p_msaa;
+	rb->screen_space_aa = p_screen_space_aa;
 	_free_render_buffer_data(rb);
 
 	{
diff --git a/servers/rendering/rasterizer_rd/rasterizer_scene_rd.h b/servers/rendering/rasterizer_rd/rasterizer_scene_rd.h
index 21c3c08d16..1647abdfb1 100644
--- a/servers/rendering/rasterizer_rd/rasterizer_scene_rd.h
+++ b/servers/rendering/rasterizer_rd/rasterizer_scene_rd.h
@@ -716,6 +716,8 @@ private:
 		RenderBufferData *data = nullptr;
 		int width = 0, height = 0;
 		RS::ViewportMSAA msaa = RS::VIEWPORT_MSAA_DISABLED;
+		RS::ViewportScreenSpaceAA screen_space_aa = RS::VIEWPORT_SCREEN_SPACE_AA_DISABLED;
+
 		RID render_target;
 
 		uint64_t auto_exposure_version = 1;
@@ -1149,7 +1151,7 @@ public:
 	GIProbeQuality gi_probe_get_quality() const;
 
 	RID render_buffers_create();
-	void render_buffers_configure(RID p_render_buffers, RID p_render_target, int p_width, int p_height, RS::ViewportMSAA p_msaa);
+	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);
 
 	RID render_buffers_get_ao_texture(RID p_render_buffers);
 	RID render_buffers_get_back_buffer_texture(RID p_render_buffers);
diff --git a/servers/rendering/rasterizer_rd/shaders/tonemap.glsl b/servers/rendering/rasterizer_rd/shaders/tonemap.glsl
index 524ca5e2ea..a142d263e2 100644
--- a/servers/rendering/rasterizer_rd/shaders/tonemap.glsl
+++ b/servers/rendering/rasterizer_rd/shaders/tonemap.glsl
@@ -48,6 +48,10 @@ layout(push_constant, binding = 1, std430) uniform Params {
 	float exposure;
 	float white;
 	float auto_exposure_grey;
+
+	vec2 pixel_size;
+	bool use_fxaa;
+	uint pad;
 }
 params;
 
@@ -255,16 +259,63 @@ vec3 apply_color_correction(vec3 color, sampler3D correction_tex) {
 	return texture(correction_tex, color).rgb;
 }
 
+vec3 do_fxaa(vec3 color, float exposure, vec2 uv_interp) {
+
+	const float FXAA_REDUCE_MIN = (1.0 / 128.0);
+	const float FXAA_REDUCE_MUL = (1.0 / 8.0);
+	const float FXAA_SPAN_MAX = 8.0;
+
+	vec3 rgbNW = textureLod(source_color, uv_interp + vec2(-1.0, -1.0) * params.pixel_size, 0.0).xyz * exposure;
+	vec3 rgbNE = textureLod(source_color, uv_interp + vec2(1.0, -1.0) * params.pixel_size, 0.0).xyz * exposure;
+	vec3 rgbSW = textureLod(source_color, uv_interp + vec2(-1.0, 1.0) * params.pixel_size, 0.0).xyz * exposure;
+	vec3 rgbSE = textureLod(source_color, uv_interp + vec2(1.0, 1.0) * params.pixel_size, 0.0).xyz * exposure;
+	vec3 rgbM = color;
+	vec3 luma = vec3(0.299, 0.587, 0.114);
+	float lumaNW = dot(rgbNW, luma);
+	float lumaNE = dot(rgbNE, luma);
+	float lumaSW = dot(rgbSW, luma);
+	float lumaSE = dot(rgbSE, luma);
+	float lumaM = dot(rgbM, luma);
+	float lumaMin = min(lumaM, min(min(lumaNW, lumaNE), min(lumaSW, lumaSE)));
+	float lumaMax = max(lumaM, max(max(lumaNW, lumaNE), max(lumaSW, lumaSE)));
+
+	vec2 dir;
+	dir.x = -((lumaNW + lumaNE) - (lumaSW + lumaSE));
+	dir.y = ((lumaNW + lumaSW) - (lumaNE + lumaSE));
+
+	float dirReduce = max((lumaNW + lumaNE + lumaSW + lumaSE) *
+								  (0.25 * FXAA_REDUCE_MUL),
+			FXAA_REDUCE_MIN);
+
+	float rcpDirMin = 1.0 / (min(abs(dir.x), abs(dir.y)) + dirReduce);
+	dir = min(vec2(FXAA_SPAN_MAX, FXAA_SPAN_MAX),
+				  max(vec2(-FXAA_SPAN_MAX, -FXAA_SPAN_MAX),
+						  dir * rcpDirMin)) *
+		  params.pixel_size;
+
+	vec3 rgbA = 0.5 * (textureLod(source_color, uv_interp + dir * (1.0 / 3.0 - 0.5), 0.0).xyz * exposure + textureLod(source_color, uv_interp + dir * (2.0 / 3.0 - 0.5), 0.0).xyz) * exposure;
+	vec3 rgbB = rgbA * 0.5 + 0.25 * (textureLod(source_color, uv_interp + dir * -0.5, 0.0).xyz * exposure +
+											textureLod(source_color, uv_interp + dir * 0.5, 0.0).xyz * exposure);
+
+	float lumaB = dot(rgbB, luma);
+	if ((lumaB < lumaMin) || (lumaB > lumaMax))
+		return rgbA;
+	else
+		return rgbB;
+}
+
 void main() {
 	vec3 color = textureLod(source_color, uv_interp, 0.0f).rgb;
 
 	// Exposure
 
+	float exposure = params.exposure;
+
 	if (params.use_auto_exposure) {
-		color /= texelFetch(source_auto_exposure, ivec2(0, 0), 0).r / params.auto_exposure_grey;
+		exposure *= 1.0 / (texelFetch(source_auto_exposure, ivec2(0, 0), 0).r / params.auto_exposure_grey);
 	}
 
-	color *= params.exposure;
+	color *= exposure;
 
 	// Early Tonemap & SRGB Conversion
 
@@ -274,6 +325,9 @@ void main() {
 		color.rgb = mix(color.rgb, glow, params.glow_intensity);
 	}
 
+	if (params.use_fxaa) {
+		color = do_fxaa(color, exposure, uv_interp);
+	}
 	color = apply_tonemapping(color, params.white);
 
 	color = linear_to_srgb(color); // regular linear -> SRGB conversion
diff --git a/servers/rendering/rendering_server_raster.h b/servers/rendering/rendering_server_raster.h
index 7ea7d0a4dc..2da593e01d 100644
--- a/servers/rendering/rendering_server_raster.h
+++ b/servers/rendering/rendering_server_raster.h
@@ -489,6 +489,7 @@ public:
 	BIND2(viewport_set_shadow_atlas_size, RID, int)
 	BIND3(viewport_set_shadow_atlas_quadrant_subdivision, RID, int, int)
 	BIND2(viewport_set_msaa, RID, ViewportMSAA)
+	BIND2(viewport_set_screen_space_aa, RID, ViewportScreenSpaceAA)
 
 	BIND2R(int, viewport_get_render_info, RID, ViewportRenderInfo)
 	BIND2(viewport_set_debug_draw, RID, ViewportDebugDraw)
diff --git a/servers/rendering/rendering_server_viewport.cpp b/servers/rendering/rendering_server_viewport.cpp
index 152e79f3e0..6fb8f6ca63 100644
--- a/servers/rendering/rendering_server_viewport.cpp
+++ b/servers/rendering/rendering_server_viewport.cpp
@@ -119,7 +119,7 @@ void RenderingServerViewport::_draw_viewport(Viewport *p_viewport, XRInterface::
 	if ((scenario_draw_canvas_bg || can_draw_3d) && !p_viewport->render_buffers.is_valid()) {
 		//wants to draw 3D but there is no render buffer, create
 		p_viewport->render_buffers = RSG::scene_render->render_buffers_create();
-		RSG::scene_render->render_buffers_configure(p_viewport->render_buffers, p_viewport->render_target, p_viewport->size.width, p_viewport->size.height, p_viewport->msaa);
+		RSG::scene_render->render_buffers_configure(p_viewport->render_buffers, p_viewport->render_target, p_viewport->size.width, p_viewport->size.height, p_viewport->msaa, p_viewport->screen_space_aa);
 	}
 
 	RSG::storage->render_target_request_clear(p_viewport->render_target, bgcolor);
@@ -506,7 +506,7 @@ void RenderingServerViewport::viewport_set_size(RID p_viewport, int p_width, int
 			RSG::scene_render->free(viewport->render_buffers);
 			viewport->render_buffers = RID();
 		} else {
-			RSG::scene_render->render_buffers_configure(viewport->render_buffers, viewport->render_target, viewport->size.width, viewport->size.height, viewport->msaa);
+			RSG::scene_render->render_buffers_configure(viewport->render_buffers, viewport->render_target, viewport->size.width, viewport->size.height, viewport->msaa, viewport->screen_space_aa);
 		}
 	}
 }
@@ -736,7 +736,20 @@ void RenderingServerViewport::viewport_set_msaa(RID p_viewport, RS::ViewportMSAA
 	}
 	viewport->msaa = p_msaa;
 	if (viewport->render_buffers.is_valid()) {
-		RSG::scene_render->render_buffers_configure(viewport->render_buffers, viewport->render_target, viewport->size.width, viewport->size.height, p_msaa);
+		RSG::scene_render->render_buffers_configure(viewport->render_buffers, viewport->render_target, viewport->size.width, viewport->size.height, p_msaa, viewport->screen_space_aa);
+	}
+}
+
+void RenderingServerViewport::viewport_set_screen_space_aa(RID p_viewport, RS::ViewportScreenSpaceAA p_mode) {
+	Viewport *viewport = viewport_owner.getornull(p_viewport);
+	ERR_FAIL_COND(!viewport);
+
+	if (viewport->screen_space_aa == p_mode) {
+		return;
+	}
+	viewport->screen_space_aa = p_mode;
+	if (viewport->render_buffers.is_valid()) {
+		RSG::scene_render->render_buffers_configure(viewport->render_buffers, viewport->render_target, viewport->size.width, viewport->size.height, viewport->msaa, p_mode);
 	}
 }
 
diff --git a/servers/rendering/rendering_server_viewport.h b/servers/rendering/rendering_server_viewport.h
index 910d1ef5e9..fcba7886c5 100644
--- a/servers/rendering/rendering_server_viewport.h
+++ b/servers/rendering/rendering_server_viewport.h
@@ -59,6 +59,7 @@ public:
 		RID render_buffers;
 
 		RS::ViewportMSAA msaa;
+		RS::ViewportScreenSpaceAA screen_space_aa;
 
 		DisplayServer::WindowID viewport_to_screen;
 		Rect2 viewport_to_screen_rect;
@@ -130,6 +131,8 @@ public:
 
 			debug_draw = RS::VIEWPORT_DEBUG_DRAW_DISABLED;
 			msaa = RS::VIEWPORT_MSAA_DISABLED;
+			screen_space_aa = RS::VIEWPORT_SCREEN_SPACE_AA_DISABLED;
+
 			for (int i = 0; i < RS::VIEWPORT_RENDER_INFO_MAX; i++) {
 				render_info[i] = 0;
 			}
@@ -206,6 +209,7 @@ public:
 	void viewport_set_shadow_atlas_quadrant_subdivision(RID p_viewport, int p_quadrant, int p_subdiv);
 
 	void viewport_set_msaa(RID p_viewport, RS::ViewportMSAA p_msaa);
+	void viewport_set_screen_space_aa(RID p_viewport, RS::ViewportScreenSpaceAA p_mode);
 
 	virtual int viewport_get_render_info(RID p_viewport, RS::ViewportRenderInfo p_info);
 	virtual void viewport_set_debug_draw(RID p_viewport, RS::ViewportDebugDraw p_draw);
diff --git a/servers/rendering/rendering_server_wrap_mt.h b/servers/rendering/rendering_server_wrap_mt.h
index 834cf82d79..818a68de8e 100644
--- a/servers/rendering/rendering_server_wrap_mt.h
+++ b/servers/rendering/rendering_server_wrap_mt.h
@@ -403,6 +403,7 @@ public:
 	FUNC2(viewport_set_shadow_atlas_size, RID, int)
 	FUNC3(viewport_set_shadow_atlas_quadrant_subdivision, RID, int, int)
 	FUNC2(viewport_set_msaa, RID, ViewportMSAA)
+	FUNC2(viewport_set_screen_space_aa, RID, ViewportScreenSpaceAA)
 
 	//this passes directly to avoid stalling, but it's pretty dangerous, so don't call after freeing a viewport
 	virtual int viewport_get_render_info(RID p_viewport, ViewportRenderInfo p_info) {
diff --git a/servers/rendering_server.h b/servers/rendering_server.h
index df91fc59bc..820a2332bc 100644
--- a/servers/rendering_server.h
+++ b/servers/rendering_server.h
@@ -639,6 +639,12 @@ public:
 
 	virtual void viewport_set_msaa(RID p_viewport, ViewportMSAA p_msaa) = 0;
 
+	enum ViewportScreenSpaceAA {
+		VIEWPORT_SCREEN_SPACE_AA_DISABLED,
+		VIEWPORT_SCREEN_SPACE_AA_FXAA,
+	};
+	virtual void viewport_set_screen_space_aa(RID p_viewport, ViewportScreenSpaceAA p_mode) = 0;
+
 	enum ViewportRenderInfo {
 
 		VIEWPORT_RENDER_INFO_OBJECTS_IN_FRAME,