Added compute shader based mesh generation test scene

material_maker/panels/preview_3d/meshes/bricks.tres

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+[gd_resource type="StandardMaterial3D" load_steps=5 format=3 uid="uid://bpe2pnw4jgdpq"]
+
+[ext_resource type="Texture2D" uid="uid://du2r5sfapuxxx" path="res://material_maker/panels/preview_3d/meshes/bricks_albedo.png" id="1"]
+[ext_resource type="Texture2D" uid="uid://dfvy71k6qeu0g" path="res://material_maker/panels/preview_3d/meshes/bricks_orm.png" id="2"]
+[ext_resource type="Texture2D" uid="uid://bgqqi03ty5vjy" path="res://material_maker/panels/preview_3d/meshes/bricks_normal.png" id="3"]
+[ext_resource type="Texture2D" uid="uid://bx4upg4i1n5db" path="res://material_maker/panels/preview_3d/meshes/bricks_heightmap.png" id="4"]
+
+[resource]
+albedo_texture = ExtResource("1")
+metallic = 1.0
+metallic_texture = ExtResource("2")
+metallic_texture_channel = 2
+roughness_texture = ExtResource("2")
+roughness_texture_channel = 1
+normal_enabled = true
+normal_texture = ExtResource("3")
+ao_enabled = true
+ao_texture = ExtResource("2")
+heightmap_enabled = true
+heightmap_scale = -1.0
+heightmap_deep_parallax = true
+heightmap_min_layers = 8
+heightmap_max_layers = 32
+heightmap_texture = ExtResource("4")

material_maker/panels/preview_3d/meshes/bricks_albedo.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://du2r5sfapuxxx"
+path.s3tc="res://.godot/imported/bricks_albedo.png-fd68b4578c80514f4fcddea3e36876b6.s3tc.ctex"
+path.etc2="res://.godot/imported/bricks_albedo.png-fd68b4578c80514f4fcddea3e36876b6.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc", "etc2_astc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://material_maker/panels/preview_3d/meshes/bricks_albedo.png"
+dest_files=["res://.godot/imported/bricks_albedo.png-fd68b4578c80514f4fcddea3e36876b6.s3tc.ctex", "res://.godot/imported/bricks_albedo.png-fd68b4578c80514f4fcddea3e36876b6.etc2.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+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

material_maker/panels/preview_3d/meshes/bricks_heightmap.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bx4upg4i1n5db"
+path.s3tc="res://.godot/imported/bricks_heightmap.png-52ab05e892532e84513e158ffb724e6d.s3tc.ctex"
+path.etc2="res://.godot/imported/bricks_heightmap.png-52ab05e892532e84513e158ffb724e6d.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc", "etc2_astc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://material_maker/panels/preview_3d/meshes/bricks_heightmap.png"
+dest_files=["res://.godot/imported/bricks_heightmap.png-52ab05e892532e84513e158ffb724e6d.s3tc.ctex", "res://.godot/imported/bricks_heightmap.png-52ab05e892532e84513e158ffb724e6d.etc2.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=7
+roughness/src_normal="res://material_maker/panels/preview_3d/meshes/bricks_normal.png"
+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

material_maker/panels/preview_3d/meshes/bricks_normal.png.import

@@ -0,0 +1,36 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bgqqi03ty5vjy"
+path.s3tc="res://.godot/imported/bricks_normal.png-7098b712f0dcca9e6492aad88863210d.s3tc.ctex"
+path.etc2="res://.godot/imported/bricks_normal.png-7098b712f0dcca9e6492aad88863210d.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc", "etc2_astc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://material_maker/panels/preview_3d/meshes/bricks_normal.png"
+dest_files=["res://.godot/imported/bricks_normal.png-7098b712f0dcca9e6492aad88863210d.s3tc.ctex", "res://.godot/imported/bricks_normal.png-7098b712f0dcca9e6492aad88863210d.etc2.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=1
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=1
+roughness/src_normal="res://material_maker/panels/preview_3d/meshes/bricks_normal.png"
+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

material_maker/panels/preview_3d/meshes/bricks_orm.png.import

@@ -0,0 +1,36 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dfvy71k6qeu0g"
+path.s3tc="res://.godot/imported/bricks_orm.png-1c80d54abc36fdd6f381da55e535c517.s3tc.ctex"
+path.etc2="res://.godot/imported/bricks_orm.png-1c80d54abc36fdd6f381da55e535c517.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc", "etc2_astc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://material_maker/panels/preview_3d/meshes/bricks_orm.png"
+dest_files=["res://.godot/imported/bricks_orm.png-1c80d54abc36fdd6f381da55e535c517.s3tc.ctex", "res://.godot/imported/bricks_orm.png-1c80d54abc36fdd6f381da55e535c517.etc2.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=8
+roughness/src_normal="res://material_maker/panels/preview_3d/meshes/bricks_normal.png"
+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

material_maker/panels/preview_3d/meshes/compute_plane.txt

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+#version 450
+// VERTEX COUNT: (size+1)*(size+1)
+// INDEX COUNT: 2*size*(size+2)-2
+
+layout(local_size_x = @LOCAL_SIZE, local_size_y = 1, local_size_z = 1) in;
+
+@DECLARATIONS
+
+layout(set = 3, binding = 0, std140) restrict buffer MM {
+	int mm_chunk_y;
+};
+
+void set_point(int x, int y) {
+	int vertex_index = x+(size+1)*y;
+	float scale = 1.0/float(size);
+	mm_out.vertices[3*vertex_index+0] = 2.0*scale*x-1.0;
+	mm_out.vertices[3*vertex_index+1] = curvature*cos(scale*x-0.5)*cos(scale*y-0.5)-curvature;
+	mm_out.vertices[3*vertex_index+2] = 2.0*scale*y-1.0;
+	vec3 tangent = normalize(vec3(2.0, -curvature*scale*sin(scale*x-0.5)*cos(scale*y-0.5), 0.0));
+	vec3 cotangent = normalize(vec3(0.0, -curvature*scale*cos(scale*x-0.5)*sin(scale*y-0.5), 2.0));
+	vec3 normal = normalize(cross(cotangent, tangent));
+	mm_out.normals[3*vertex_index+0] = normal.x;
+	mm_out.normals[3*vertex_index+1] = normal.y;
+	mm_out.normals[3*vertex_index+2] = normal.z;
+	mm_out.tangents[4*vertex_index+0] = tangent.x;
+	mm_out.tangents[4*vertex_index+1] = tangent.y;
+	mm_out.tangents[4*vertex_index+2] = tangent.z;
+	mm_out.tangents[4*vertex_index+3] = 1.0;
+	mm_out.tex_uvs[2*vertex_index+0] = scale*x;
+	mm_out.tex_uvs[2*vertex_index+1] = scale*y;
+}
+
+void main() {
+	ivec2 c = ivec2(gl_GlobalInvocationID.xy)+ivec2(0, mm_chunk_y);
+	set_point(c.x, c.y);
+	mm_out.indexes[2*(c.x+(size+2)*c.y)] = c.x+(size+1)*(c.y+1);
+	mm_out.indexes[2*(c.x+(size+2)*c.y)+1] = c.x+(size+1)*c.y;
+	if (c.x == size-1) {
+		mm_out.indexes[2*(size+(size+2)*c.y)] = size+(size+1)*(c.y+1);
+		mm_out.indexes[2*(size+(size+2)*c.y)+1] = size+(size+1)*c.y;
+		set_point(size, c.y);
+		if (c.y == size-1) {
+			set_point(size, size);
+		} else {
+			mm_out.indexes[2*(size+(size+2)*c.y)+2] = size+(size+1)*c.y;
+			mm_out.indexes[2*(size+(size+2)*c.y)+3] = (size+1)*(c.y+2);
+		}
+	}
+	if (c.y == size-1) {
+		set_point(c.x, size);
+	}
+}

material_maker/panels/preview_3d/meshes/mesh_generator.gd

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+extends Node
+
+var shader : MMComputeShader = MMComputeShader.new()
+var size : int = 2
+
+@onready var generated_mesh = $Pivot/MeshInstance
+@onready var plane = $Pivot/Plane
+
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	var w : Window = get_window()
+	w.borderless = false
+	w.size = Vector2i(800, 600)
+	w.move_to_center()
+	await setup_shader()
+	await generate_mesh()
+
+func get_expression_value_from_string(string : String, prefix: String, values: Dictionary) -> int:
+	var begin : int = string.find(prefix)
+	if begin == -1:
+		return 0
+	begin += prefix.length()
+	var end : int = string.find("\n", begin)
+	var expression_string : String = string.substr(begin, end-begin)
+	var expression : Expression = Expression.new()
+	var input_names : PackedStringArray = PackedStringArray()
+	var input_values : Array = []
+	for k in values.keys():
+		input_names.append(k)
+		input_values.append(values[k])
+	expression.parse(expression_string, input_names)
+	var rv : int = expression.execute(input_values)
+	print(prefix+" "+str(rv))
+	return rv
+
+func setup_shader():
+	var string : String = FileAccess.open("res://material_maker/panels/preview_3d/meshes/compute_plane.txt", FileAccess.READ).get_as_text()
+	var vertex_count : int = get_expression_value_from_string(string, "// VERTEX COUNT:", {size=size})
+	var index_count : int = get_expression_value_from_string(string, "// INDEX COUNT:", {size=size})
+	shader.local_size = size if size < 32 else 32
+	shader.clear()
+	shader.add_parameter_or_texture("size", "int", size)
+	shader.add_parameter_or_texture("curvature", "float", 0.0)
+	shader.add_output_parameter("vertices", "float", 3*vertex_count)
+	shader.add_output_parameter("normals", "float", 3*vertex_count)
+	shader.add_output_parameter("tangents", "float", 4*vertex_count)
+	shader.add_output_parameter("tex_uvs", "float", 2*vertex_count)
+	shader.add_output_parameter("indexes", "int", index_count)
+	await shader.set_shader_ext(string)
+
+func generate_mesh():
+	var opv : Dictionary = { vertices_format="vec3", normals_format="vec3", tex_uvs_format="vec2" }
+	shader.set_parameter("size", size)
+	shader.set_parameter("curvature", $UI/VBoxContainer/Curvature.value)
+	await shader.render_ext([], Vector2i(size, size), opv)
+	var mesh : ArrayMesh = generated_mesh.mesh
+	mesh.clear_surfaces()
+	var flags : int = Mesh.ARRAY_FORMAT_VERTEX | Mesh.ARRAY_FORMAT_NORMAL | Mesh.ARRAY_FORMAT_TEX_UV | Mesh.ARRAY_FORMAT_INDEX
+	var vertices : PackedVector3Array = opv.vertices
+	var normals : PackedVector3Array = opv.normals
+	var tangents : PackedFloat32Array = opv.tangents
+	var tex_uvs : PackedVector2Array = opv.tex_uvs
+	var indexes : PackedInt32Array = opv.indexes
+	var arrays : Array = [vertices, normals, tangents, null, tex_uvs, null, null, null, null, null, null, null, indexes]
+	mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLE_STRIP, arrays, [], {}, flags)
+	print("Done")
+
+func _on_reload_shader_pressed():
+	await setup_shader()
+	await generate_mesh()
+
+func _on_model_pressed():
+	generated_mesh.visible = not generated_mesh.visible
+	plane.visible = not plane.visible
+
+func _on_size_value_changed(value):
+	size = 1 << int(value)
+	await setup_shader()
+	await generate_mesh()
+
+func _on_curvature_value_changed(value):
+	await generate_mesh()