Add a variable rate shading demo (#852)

3d/variable_rate_shading/README.md

@@ -0,0 +1,15 @@
+# Variable Rate Shading
+
+This project showcases how to use
+[variable rate shading](https://docs.godotengine.org/en/latest/tutorials/3d/variable_rate_shading.html)
+(VRS) in 3D to improve performance.
+
+Performance metrics are also displayed to evaluate potential performance gains.
+
+Language: GDScript
+
+Renderer: Forward Plus
+
+## Screenshots
+
+![Screenshot](screenshots/variable_rate_shading.webp)

3d/variable_rate_shading/icon.webp.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://5rxk8qdqtutc"
+path="res://.godot/imported/icon.webp-e94f9a68b0f625a567a797079e4d325f.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.webp"
+dest_files=["res://.godot/imported/icon.webp-e94f9a68b0f625a567a797079e4d325f.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

3d/variable_rate_shading/information.gd

@@ -0,0 +1,14 @@
+extends VBoxContainer
+
+
+func _ready() -> void:
+	get_viewport().size_changed.connect(_on_viewport_size_changed)
+	_on_viewport_size_changed()
+
+
+func _process(_delta: float) -> void:
+	$FPS.text = "%d FPS (%.2f mspf)" % [Engine.get_frames_per_second(), 1000.0 / Engine.get_frames_per_second()]
+
+
+func _on_viewport_size_changed() -> void:
+	$Resolution.text = "%s × %s" % [get_viewport().size.x, get_viewport().size.y]

3d/variable_rate_shading/project.godot

@@ -0,0 +1,36 @@
+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="Variable Rate Shading"
+config/description="This project showcases how to use variable rate shading (VRS) in 3D to improve performance.
+
+Performance metrics are also displayed to evaluate potential performance gains."
+run/main_scene="res://vrs.tscn"
+config/features=PackedStringArray("4.0")
+config/icon="res://icon.webp"
+
+[display]
+
+window/vsync/vsync_mode=0
+window/stretch/mode="canvas_items"
+window/stretch/aspect="expand"
+
+[rendering]
+
+textures/default_filters/anisotropic_filtering_level=4
+vrs/mode=1
+vrs/texture="res://vrs_texture.png"
+textures/quality/screen_space_aa=0
+
+[xr]
+
+shaders/enabled=true

3d/variable_rate_shading/vrs.gd

@@ -0,0 +1,63 @@
+extends Node3D
+
+@onready var option_button: OptionButton = $CanvasLayer/VBoxContainer/HBoxContainer/OptionButton
+@onready var texture_rect: TextureRect = $CanvasLayer/VBoxContainer/TextureRect
+@onready var camera: Camera3D = $Camera3D
+@onready var xr_camera: Camera3D = $XROrigin3D/XRCamera3D
+
+@export var texture: Texture
+
+var xr_interface: MobileVRInterface
+
+func _set_xr_mode() -> void:
+	var vrs_mode = get_viewport().vrs_mode
+	if vrs_mode == Viewport.VRS_XR:
+		xr_interface = XRServer.find_interface("Native mobile")
+		if xr_interface and xr_interface.initialize():
+			# Disable a lot of VR-specific stuff like lens distortion.
+			xr_interface.eye_height = 0.0
+			xr_interface.k1 = 0.0
+			xr_interface.k2 = 0.0
+			xr_interface.oversample = 1.0
+
+			get_viewport().use_xr = true
+			xr_camera.current = true
+
+			# Reposition our origin point to work around an engine bug.
+			$XROrigin3D.global_transform = camera.global_transform
+	else:
+		if xr_interface:
+			xr_interface.uninitialize()
+
+		get_viewport().use_xr = false
+		camera.current = true
+
+
+func _update_texture() -> void:
+	var vrs_mode = get_viewport().vrs_mode
+	if vrs_mode == Viewport.VRS_DISABLED:
+		texture_rect.visible = false
+	elif vrs_mode == Viewport.VRS_TEXTURE:
+		get_viewport().vrs_texture = texture
+		texture_rect.texture = texture
+		texture_rect.visible = true
+	elif vrs_mode == Viewport.VRS_XR:
+		# Doesn't seem to be supported yet. This should be exposed in a future engine version.
+		#if xr_interface:
+		#	texture_rect.texture = xr_interface.get_vrs_texture()
+		#	texture_rect.visible = true
+		#else:
+		#	texture_rect.visible = false
+		texture_rect.visible = false
+
+
+func _ready() -> void:
+	var vrs_mode = get_viewport().vrs_mode
+	option_button.selected = vrs_mode
+	_update_texture()
+
+
+func _on_option_button_item_selected(index: int) -> void:
+	get_viewport().vrs_mode = index as Viewport.VRSMode
+	_set_xr_mode()
+	_update_texture()

3d/variable_rate_shading/vrs.tscn

@@ -0,0 +1,968 @@
+[gd_scene load_steps=15 format=3 uid="uid://byr2ixl00dqdl"]
+
+[ext_resource type="Script" path="res://vrs.gd" id="1_5k5b8"]
+[ext_resource type="Texture2D" uid="uid://dsdx5gplyr6or" path="res://vrs_texture.png" id="2_44sk1"]
+[ext_resource type="Script" path="res://information.gd" id="3_mhihd"]
+
+[sub_resource type="ProceduralSkyMaterial" id="ProceduralSkyMaterial_xgdl3"]
+sky_horizon_color = Color(0.64625, 0.65575, 0.67075, 1)
+ground_horizon_color = Color(0.64625, 0.65575, 0.67075, 1)
+use_debanding = false
+
+[sub_resource type="Sky" id="Sky_ndq4s"]
+sky_material = SubResource("ProceduralSkyMaterial_xgdl3")
+
+[sub_resource type="Environment" id="Environment_0bhf1"]
+background_mode = 2
+sky = SubResource("Sky_ndq4s")
+tonemap_mode = 3
+tonemap_white = 6.0
+glow_enabled = true
+
+[sub_resource type="BoxMesh" id="BoxMesh_ocds8"]
+
+[sub_resource type="Gradient" id="Gradient_f30sk"]
+interpolation_mode = 2
+offsets = PackedFloat32Array(0.038961, 0.584416, 1)
+colors = PackedColorArray(0.190762, 0.190762, 0.190762, 1, 0.800448, 0.506851, 0.233245, 1, 1, 1, 1, 1)
+
+[sub_resource type="FastNoiseLite" id="FastNoiseLite_x5xqt"]
+fractal_octaves = 10
+fractal_lacunarity = 2.201
+fractal_gain = 1.09
+
+[sub_resource type="NoiseTexture2D" id="NoiseTexture2D_ecwng"]
+seamless = true
+color_ramp = SubResource("Gradient_f30sk")
+noise = SubResource("FastNoiseLite_x5xqt")
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_4bkoq"]
+albedo_texture = SubResource("NoiseTexture2D_ecwng")
+uv1_scale = Vector3(1.5, 1, 1)
+texture_filter = 5
+
+[sub_resource type="BoxMesh" id="BoxMesh_jpqrm"]
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_fmqm1"]
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_uh2jd"]
+albedo_color = Color(0.7, 1, 2.4, 1)
+albedo_texture = SubResource("NoiseTexture2D_ecwng")
+uv1_scale = Vector3(1.5, 1, 1)
+texture_filter = 5
+
+[node name="Node3D" type="Node3D"]
+script = ExtResource("1_5k5b8")
+texture = ExtResource("2_44sk1")
+
+[node name="WorldEnvironment" type="WorldEnvironment" parent="."]
+environment = SubResource("Environment_0bhf1")
+
+[node name="DirectionalLight3D" type="DirectionalLight3D" parent="."]
+transform = Transform3D(-0.866025, -0.433013, 0.25, 0, 0.5, 0.866025, -0.5, 0.75, -0.433013, 0, 0, 0)
+visible = false
+shadow_enabled = true
+
+[node name="Camera3D" type="Camera3D" parent="."]
+transform = Transform3D(0.92086, -0.232944, 0.312657, 0, 0.801902, 0.597456, -0.389894, -0.550173, 0.738439, 1.02558, 2.09094, 2.36376)
+fov = 50.0
+
+[node name="XROrigin3D" type="XROrigin3D" parent="."]
+
+[node name="XRCamera3D" type="XRCamera3D" parent="XROrigin3D"]
+transform = Transform3D(0.92086, -0.232944, 0.312657, 0, 0.801902, 0.597456, -0.389894, -0.550173, 0.738439, 1.02558, 2.09094, 2.36376)
+
+[node name="Boxes" type="Node3D" parent="."]
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="Boxes"]
+mesh = SubResource("BoxMesh_ocds8")
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+
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+
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+mesh = SubResource("BoxMesh_jpqrm")
+skeleton = NodePath("../..")
+surface_material_override/0 = SubResource("StandardMaterial3D_fmqm1")
+
+[node name="OmniLight3D" type="OmniLight3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.6, 0)
+omni_range = 0.2
+omni_attenuation = 17.1484
+
+[node name="OmniLight3D2" type="OmniLight3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -1, 1, 0)
+light_color = Color(1, 0.952941, 0.392157, 1)
+shadow_enabled = true
+shadow_bias = 0.03
+
+[node name="CanvasLayer" type="CanvasLayer" parent="."]
+
+[node name="VBoxContainer" type="VBoxContainer" parent="CanvasLayer"]
+offset_left = 16.0
+offset_top = 16.0
+offset_right = 144.0
+offset_bottom = 179.0
+theme_override_constants/separation = 10
+
+[node name="HBoxContainer" type="HBoxContainer" parent="CanvasLayer/VBoxContainer"]
+layout_mode = 2
+theme_override_constants/separation = 15
+
+[node name="Label" type="Label" parent="CanvasLayer/VBoxContainer/HBoxContainer"]
+layout_mode = 2
+text = "VRS Mode"
+
+[node name="OptionButton" type="OptionButton" parent="CanvasLayer/VBoxContainer/HBoxContainer"]
+layout_mode = 2
+item_count = 3
+selected = 0
+popup/item_0/text = "Disabled"
+popup/item_0/id = 0
+popup/item_1/text = "Texture"
+popup/item_1/id = 1
+popup/item_2/text = "XR"
+popup/item_2/id = 2
+
+[node name="TextureRect" type="TextureRect" parent="CanvasLayer/VBoxContainer"]
+modulate = Color(1, 1, 1, 0.501961)
+texture_filter = 1
+layout_mode = 2
+texture = ExtResource("2_44sk1")
+expand_mode = 4
+
+[node name="Information" type="VBoxContainer" parent="."]
+anchors_preset = 1
+anchor_left = 1.0
+anchor_right = 1.0
+offset_left = -175.0
+offset_top = 16.0
+offset_right = -16.0
+offset_bottom = 108.0
+grow_horizontal = 0
+script = ExtResource("3_mhihd")
+
+[node name="Resolution" type="Label" parent="Information"]
+layout_mode = 2
+text = "1152 × 648"
+horizontal_alignment = 2
+
+[node name="FPS" type="Label" parent="Information"]
+layout_mode = 2
+text = "60 FPS (16.67 mspf)"
+horizontal_alignment = 2
+
+[connection signal="item_selected" from="CanvasLayer/VBoxContainer/HBoxContainer/OptionButton" to="." method="_on_option_button_item_selected"]

3d/variable_rate_shading/vrs_texture.gdshader

@@ -0,0 +1,30 @@
+shader_type canvas_item;
+
+void fragment() {
+	float vrs = texture(TEXTURE, UV).r * 255.0;
+
+	// Map valid entries to human-visible colors.
+	// This is only used if using the red channel colors between 0.0/255 and 10.0/255,
+	// rather than relying on Godot to aliases the output colors below to variable shading rates.
+	//
+	// `vrs_texture.png` in this project already uses the aliased colors for convenience,
+	// but `vrs_texture_original.png` does not.
+	// The output shading rate from those two textures is identical.
+	if (vrs == 0.0) { // 1x1
+		COLOR = vec4(0.0, 0.0, 0.0, 1.0);
+	} else if (vrs == 1.0) { // 1x2
+		COLOR = vec4(0.0, 0.5, 0.0, 1.0);
+	} else if (vrs == 4.0) { // 2x1
+		COLOR = vec4(0.5, 0.0, 0.0, 1.0);
+	} else if (vrs == 5.0) { // 2x2
+		COLOR = vec4(0.5, 0.5, 0.0, 1.0);
+	} else if (vrs == 6.0) { // 2x4
+		COLOR = vec4(0.5, 1.0, 0.0, 1.0);
+	} else if (vrs == 9.0) { // 4x2
+		COLOR = vec4(1.0, 0.5, 0.0, 1.0);
+	} else if (vrs == 10.0) { // 4x4
+		COLOR = vec4(1.0, 1.0, 0.0, 1.0);
+	} else {
+		COLOR = vec4(1.0, 0.5, 1.0, 1.0);
+	}
+}

3d/variable_rate_shading/vrs_texture.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dsdx5gplyr6or"
+path="res://.godot/imported/vrs_texture.png-3955700abb554e70974bdb2e6e939d1f.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://vrs_texture.png"
+dest_files=["res://.godot/imported/vrs_texture.png-3955700abb554e70974bdb2e6e939d1f.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

3d/variable_rate_shading/vrs_texture_original.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://cjey45f8og06c"
+path="res://.godot/imported/vrs_texture_original.png-810f51ab8ef891a15806dc85353709c1.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://vrs_texture_original.png"
+dest_files=["res://.godot/imported/vrs_texture_original.png-810f51ab8ef891a15806dc85353709c1.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0