Implemented multi-pass nodes and fixed blur. Various other fixes.

* Added a "constant wave" in the pattern node
* Updated graphEdit to detect and forbid loops
* Modified code that renders to texture to update a texture instead of returning one (so we avoid updating everything and rely on everything being updated automatically wrt textures)
* base library is loaded from filesystem (instead of package) if available

addons/procedural_material/common.shader

@@ -13,6 +13,10 @@ vec3 rand3(vec2 x) {
                           dot(x, vec2(13.254, 5.867)))) * 43758.5453);
 }
 
+float wave_constant(float x) {
+	return 1.0;
+}
+
 float wave_sin(float x) {
 	return 0.5-0.5*cos(3.1415928*2.0*x);
 }

addons/procedural_material/graph_edit.gd

@@ -8,7 +8,7 @@ signal save_path_changed
 signal graph_changed
 
 func _ready():
-	pass
+	OS.low_processor_usage_mode = true
 
 func get_source(node, port):
 	for c in get_connection_list():
@@ -21,24 +21,35 @@ func add_node(node, global_position = null):
 		node.offset = (scroll_offset + global_position - rect_global_position) / zoom
 	node.connect("close_request", self, "remove_node", [ node ])
 
+func connect_node(from, from_slot, to, to_slot):
+	var source_list = [ from ]
+	while !source_list.empty():
+		var source = source_list.pop_front()
+		if source == to:
+			#print("cannot connect %s to %s (%s)" % [from, to, source])
+			return false
+		for c in get_connection_list():
+			if c.to == source and source_list.find(c.from) == -1:
+				source_list.append(c.from)
+	var disconnect = get_source(to, to_slot)
+	if disconnect != null:
+		.disconnect_node(disconnect.node, disconnect.slot, to, to_slot)
+	.connect_node(from, from_slot, to, to_slot)
+	send_changed_signal()
+	return true
+
+func disconnect_node(from, from_slot, to, to_slot):
+	.disconnect_node(from, from_slot, to, to_slot)
+	send_changed_signal();
+
 func remove_node(node):
 	var node_name = node.name
 	for c in get_connection_list():
 		if c.from == node_name or c.to == node_name:
 			disconnect_node(c.from, c.from_port, c.to, c.to_port)
-	node.queue_free()
 			send_changed_signal()
+	node.queue_free()
 
-func _on_GraphEdit_connection_request(from, from_slot, to, to_slot):
-	var disconnect = get_source(to, to_slot)
-	if disconnect != null:
-		disconnect_node(disconnect.node, disconnect.slot, to, to_slot)
-	connect_node(from, from_slot, to, to_slot)
-	send_changed_signal();
-
-func _on_GraphEdit_disconnection_request(from, from_slot, to, to_slot):
-	disconnect_node(from, from_slot, to, to_slot)
-	send_changed_signal();
 
 # Global operations on graph
 
@@ -120,7 +131,6 @@ func do_load_file(filename):
 	for c in data.connections:
 		connect_node(c.from, c.from_port, c.to, c.to_port)
 	set_save_path(filename)
-	send_changed_signal()
 	set_need_save(false)
 
 func save_file():
@@ -164,6 +174,8 @@ func send_changed_signal():
 func do_send_changed_signal():
 	emit_signal("graph_changed")
 
+# Drag and drop
+
 func can_drop_data(position, data):
 	return typeof(data) == TYPE_DICTIONARY and data.has('type')
 
@@ -180,8 +192,8 @@ func setup_material(shader_material, textures, shader_code):
 
 var render_queue = []
 
-func render_to_viewport(node, size, method, args):
-	render_queue.append( { shader=node.generate_shader(), textures=node.get_textures(), size=size, method=method, args=args } )
+func render_shader_to_viewport(shader, textures, size, method, args):
+	render_queue.append( { shader=shader, textures=textures, size=size, method=method, args=args } )
 	if render_queue.size() == 1:
 		while !render_queue.empty():
 			var job = render_queue.front()
@@ -190,6 +202,7 @@ func render_to_viewport(node, size, method, args):
 			$SaveViewport/ColorRect.rect_size = Vector2(job.size, job.size)
 			var shader_material = $SaveViewport/ColorRect.material
 			shader_material.shader.code = job.shader
+			if job.textures != null:
 				for k in job.textures.keys():
 					shader_material.set_shader_param(k+"_tex", job.textures[k])
 			$SaveViewport.render_target_update_mode = Viewport.UPDATE_ONCE
@@ -200,6 +213,9 @@ func render_to_viewport(node, size, method, args):
 			callv(job.method, job.args)
 			render_queue.pop_front()
 
+func render_to_viewport(node, size, method, args):
+	render_shader_to_viewport(node.generate_shader(), node.get_textures(), size, method, args)
+
 func export_texture(node, filename, size = 256):
 	if node == null:
 		return null
@@ -210,15 +226,16 @@ func do_export_texture(filename):
 	var viewport_image = viewport_texture.get_data()
 	viewport_image.save_png(filename)
 
-func precalculate_texture(node, size, object, method, args):
+func precalculate_node(node, size, target_texture, object, method, args):
 	if node == null:
 		return null
 	render_to_viewport(node, size, "do_precalculate_texture", [ object, method, args ])
 
-func do_precalculate_texture(object, method, args):
+func precalculate_shader(shader, textures, size, target_texture, object, method, args):
+	render_shader_to_viewport(shader, textures, size, "do_precalculate_texture", [ target_texture, object, method, args ])
+
+func do_precalculate_texture(target_texture, object, method, args):
 	var viewport_texture = $SaveViewport.get_texture()
-	var texture = ImageTexture.new()
-	texture.create_from_image(viewport_texture.get_data())
-	args.append(texture)
+	target_texture.create_from_image(viewport_texture.get_data())
 	object.callv(method, args)
 

addons/procedural_material/graph_edit.tscn

@@ -243,7 +243,7 @@ COLOR = vec4(colorize_3_0_rgb, 1.0);
 render_priority = 0
 shader = SubResource( 2 )
 
-[node name="GraphEdit" type="GraphEdit"]
+[node name="GraphEdit" type="GraphEdit" index="0"]
 
 self_modulate = Color( 1, 1, 1, 0 )
 anchor_left = 0.0
@@ -267,8 +267,6 @@ _sections_unfolded = [ "Material", "Mouse", "Visibility" ]
 
 [node name="Material" parent="." index="0" instance=ExtResource( 2 )]
 
-margin_right = 111.0
-margin_bottom = 118.0
 theme = SubResource( 1 )
 _sections_unfolded = [ "Anchor", "Margin", "Mouse", "Theme", "slot", "slot/2", "slot/3", "slot/4", "slot/5" ]
 
@@ -331,9 +329,9 @@ wait_time = 0.1
 one_shot = true
 autostart = false
 
-[connection signal="connection_request" from="." to="." method="_on_GraphEdit_connection_request"]
+[connection signal="connection_request" from="." to="." method="connect_node"]
 
-[connection signal="disconnection_request" from="." to="." method="_on_GraphEdit_disconnection_request"]
+[connection signal="disconnection_request" from="." to="." method="disconnect_node"]
 
 [connection signal="timeout" from="Timer" to="." method="do_send_changed_signal"]
 

addons/procedural_material/library.gd

@@ -26,6 +26,9 @@ func get_drag_data(position):
 
 func _ready():
 	var root = create_item()
+	var lib_path = OS.get_executable_path()
+	lib_path = lib_path.left(max(lib_path.rfind("\\"), lib_path.rfind("/"))+1)+"library/base.json"
+	if !add_library(lib_path):
 		add_library("res://addons/procedural_material/library/base.json")
 	add_library("user://library/user.json")
 
@@ -33,13 +36,15 @@ func add_library(filename):
 	var root = get_root()
 	var file = File.new()
 	if file.open(filename, File.READ) != OK:
-		return
+		return false
 	var lib = parse_json(file.get_as_text())
 	file.close()
 	if lib != null && lib.has("lib"):
 		for m in lib.lib:
 			m.library = filename
 			add_item(m, m.tree_item)
+		return true
+	return false
 
 func add_item(item, item_name, item_parent = null):
 	if item_parent == null:

addons/procedural_material/node_base.gd

@@ -1,6 +1,7 @@
 tool
 extends GraphNode
 
+# A class that provides the shader node interface for a node port
 class OutPort:
 	var node = null
 	var port = null
@@ -130,7 +131,7 @@ func get_shader_code(uv, slot = 0):
 
 func get_textures():
 	var list = {}
-	for i in range(5):
+	for i in range(get_connection_input_count()):
 		var source = get_source(i)
 		if source != null:
 			var source_list = source.get_textures()
@@ -149,17 +150,13 @@ func deserialize_element(e):
 			return Color(e.r, e.g, e.b, e.a)
 	return e
 
-func generate_shader(slot = 0):
+func do_generate_shader(src_code):
 	var code
-	code = "shader_type canvas_item;\n\n"
+	code = "shader_type canvas_item;\n"
 	var file = File.new()
 	file.open("res://addons/procedural_material/common.shader", File.READ)
 	code += file.get_as_text()
 	code += "\n"
-	for c in get_parent().get_children():
-		if c is GraphNode:
-			c.reset()
-	var src_code = get_shader_code("UV", slot)
 	var shader_code = src_code.defs
 	shader_code += "void fragment() {\n"
 	shader_code += src_code.code
@@ -169,6 +166,13 @@ func generate_shader(slot = 0):
 	code += shader_code
 	return code
 	
+func generate_shader(slot = 0):
+	# Reset all nodes
+	for c in get_parent().get_children():
+		if c is GraphNode:
+			c.reset()
+	return do_generate_shader(get_shader_code("UV", slot))
+
 func serialize():
 	var type = get_script().resource_path
 	type = type.right(type.find_last("/")+1)
@@ -189,13 +193,22 @@ func deserialize(data):
 			set(variable, value)
 	update_property_widgets()
 
+# Render targets again for multipass filters
+
+func rerender_targets():
+	for c in get_parent().get_connection_list():
+		if c.from == name:
+			var node = get_parent().get_node(c.to)
+			if node != null and node is GraphNode:
+				node._rerender()
+
+func _rerender():
+	rerender_targets()
+
 # Generic code for convolution nodes
 
-func get_shader_code_convolution(convolution, uv):
+func get_shader_code_convolution(src, convolution, uv):
 	var rv = { defs="", code="" }
-	var src = get_source()
-	if src == null:
-		return rv
 	var variant_index = generated_variants.find(uv)
 	var need_defs = false
 	if generated_variants.empty():

addons/procedural_material/nodes/blur.gd

@@ -4,10 +4,69 @@ extends "res://addons/procedural_material/node_base.gd"
 var sigma = 1.0
 var epsilon = 0.005
 
+var input_shader = ""
+var input_texture
+var mid_texture
+var final_texture
+
 func _ready():
-	initialize_properties([ $HBoxContainer1/sigma, $HBoxContainer2/epsilon ])
+	input_texture = ImageTexture.new()
+	mid_texture = ImageTexture.new()
+	final_texture = ImageTexture.new()
+	initialize_properties([ $HBoxContainer1/epsilon, $HBoxContainer2/sigma ])
+
+func get_gaussian_blur_shader(v):
+	var shader_code
+	var kernel_size = 10
+	var kernel = []
+	kernel.resize(2*kernel_size+1)
+	shader_code = "shader_type canvas_item;\n"
+	shader_code += "uniform sampler2D input_tex;\n"
+	shader_code += "void fragment() {\n"
+	shader_code += "vec3 color = vec3(0.0);"
+	var sum = 0
+	for x in range(-kernel_size, kernel_size+1):
+		var coef = exp(-0.5*(pow((x)/sigma, 2.0))) / (2.0*PI*sigma*sigma)
+		kernel[x+kernel_size] = coef
+		sum += coef
+	for x in range(-kernel_size, kernel_size+1):
+		shader_code += "color += %.9f*textureLod(input_tex, UV+vec2(%.9f, %.9f), %.9f).rgb;\n" % [ kernel[x+kernel_size] / sum, x*v.x, x*v.y, epsilon ]
+	shader_code += "COLOR = vec4(color, 1.0);\n"
+	shader_code += "}\n"
+	return shader_code;
+
+func _rerender():
+	get_parent().precalculate_shader(input_shader, get_source().get_textures(), 4096, input_texture, self, "pass_1", [])
+
+func pass_1():
+	get_parent().precalculate_shader(get_gaussian_blur_shader(Vector2(epsilon, 0)), { input=input_texture}, 4096, mid_texture, self, "pass_2", [])
+
+func pass_2():
+	get_parent().precalculate_shader(get_gaussian_blur_shader(Vector2(0, epsilon)), { input=mid_texture}, 4096, final_texture, self, "rerender_targets", [])
+
+func get_textures():
+	var list = {}
+	list[name] = final_texture
+	return list
 
 func _get_shader_code(uv):
+	var rv = { defs="", code="" }
+	var src = get_source()
+	if src == null:
+		return rv
+	input_shader = do_generate_shader(src.get_shader_code("UV"))
+	_rerender()
+	if generated_variants.empty():
+		rv.defs = "uniform sampler2D "+name+"_tex;\n"
+	var variant_index = generated_variants.find(uv)
+	if variant_index == -1:
+		variant_index = generated_variants.size()
+		generated_variants.append(uv)
+		rv.code = "vec3 "+name+"_"+str(variant_index)+"_rgb = texture("+name+"_tex, "+uv+").rgb;\n"
+	rv.rgb = name+"_"+str(variant_index)+"_rgb"
+	return rv
+
+func __get_shader_code(uv):
 	var convolution = {
 		kernel=[
 			0, 0, 0, 0, 0,

addons/procedural_material/nodes/blur.tscn

@@ -5,7 +5,7 @@
 [sub_resource type="Theme" id=1]
 
 
-[node name="Blur" type="GraphNode" index="0"]
+[node name="Blur" type="GraphNode"]
 
 anchor_left = 0.0
 anchor_top = 0.0
@@ -77,13 +77,13 @@ mouse_filter = 2
 mouse_default_cursor_shape = 0
 size_flags_horizontal = 3
 size_flags_vertical = 4
-text = "Sigma:"
+text = "Grid:"
 percent_visible = 1.0
 lines_skipped = 0
 max_lines_visible = -1
 _sections_unfolded = [ "Size Flags" ]
 
-[node name="sigma" type="SpinBox" parent="HBoxContainer1" index="1"]
+[node name="epsilon" type="SpinBox" parent="HBoxContainer1" index="1"]
 
 anchor_left = 0.0
 anchor_top = 0.0
@@ -98,11 +98,11 @@ mouse_filter = 0
 mouse_default_cursor_shape = 0
 size_flags_horizontal = 1
 size_flags_vertical = 1
-min_value = 0.05
-max_value = 5.0
-step = 0.05
+min_value = 0.001
+max_value = 0.01
+step = 0.001
 page = 0.0
-value = 1.0
+value = 0.005
 exp_edit = false
 rounded = false
 editable = true
@@ -143,13 +143,13 @@ mouse_filter = 2
 mouse_default_cursor_shape = 0
 size_flags_horizontal = 3
 size_flags_vertical = 4
-text = "Grid:"
+text = "Sigma:"
 percent_visible = 1.0
 lines_skipped = 0
 max_lines_visible = -1
 _sections_unfolded = [ "Size Flags" ]
 
-[node name="epsilon" type="SpinBox" parent="HBoxContainer2" index="1"]
+[node name="sigma" type="SpinBox" parent="HBoxContainer2" index="1"]
 
 anchor_left = 0.0
 anchor_top = 0.0
@@ -164,11 +164,11 @@ mouse_filter = 0
 mouse_default_cursor_shape = 0
 size_flags_horizontal = 1
 size_flags_vertical = 1
-min_value = 0.001
-max_value = 0.01
-step = 0.001
+min_value = 0.05
+max_value = 20.0
+step = 0.05
 page = 0.0
-value = 0.005
+value = 1.0
 exp_edit = false
 rounded = false
 editable = true

addons/procedural_material/nodes/material.gd

@@ -9,13 +9,8 @@ var normal_scale
 var ao_light_affect
 var depth_scale
 
-var texture_albedo            = null
-var texture_metallic          = null
-var texture_roughness         = null
-var texture_emission          = null
-var texture_normal_map        = null
-var texture_ambient_occlusion = null
-var texture_depth_map         = null
+var current_material_list = []
+var generated_textures = {}
 
 const TEXTURE_LIST = [
 	{ port=0, texture="albedo" },
@@ -28,8 +23,23 @@ const TEXTURE_LIST = [
 ]
 
 func _ready():
+	for t in TEXTURE_LIST:
+		generated_textures[t.texture] = { shader=null, source=null, texture=null}
 	initialize_properties([ $Albedo/albedo_color, $Metallic/metallic, $Roughness/roughness, $Emission/emission_energy, $NormalMap/normal_scale, $AmbientOcclusion/ao_light_affect, $DepthMap/depth_scale ])
 
+func _rerender():
+	var has_textures = false
+	for t in TEXTURE_LIST:
+		var shader = generated_textures[t.texture].shader
+		if shader != null:
+			var input_textures = null
+			if generated_textures[t.texture].source != null:
+				input_textures = generated_textures[t.texture].source.get_textures()
+			get_parent().precalculate_shader(shader, input_textures, 1024, generated_textures[t.texture].texture, self, "do_update_materials", [ current_material_list ])
+			has_textures = true
+	if !has_textures:
+		do_update_materials(current_material_list)
+
 func _get_shader_code(uv):
 	var rv = { defs="", code="", f="0.0" }
 	var src = get_source()
@@ -37,55 +47,53 @@ func _get_shader_code(uv):
 		rv = src.get_shader_code(uv)
 	return rv
 
-func _get_state_variables():
-	return [ ]
-
 func update_materials(material_list):
+	current_material_list = material_list
 	var has_textures = false
 	for t in TEXTURE_LIST:
 		var source = get_source(t.port)
 		if source == null:
-			set("texture_"+t.texture, null)
+			generated_textures[t.texture].shader = null
+			generated_textures[t.texture].source = null
+			if generated_textures[t.texture].texture != null:
+				generated_textures[t.texture].texture = null
 		else:
-			get_parent().precalculate_texture(source, 1024, self, "store_texture", [ t.texture, material_list ])
-			has_textures = true
-	if !has_textures:
-		do_update_materials(material_list)
-
-func store_texture(texture_name, material_list, texture):
-	set("texture_"+texture_name, texture)
-	do_update_materials(material_list)
+			generated_textures[t.texture].shader = source.generate_shader()
+			generated_textures[t.texture].source = source
+			if generated_textures[t.texture].texture == null:
+				generated_textures[t.texture].texture = ImageTexture.new()
+	_rerender()
 
 func do_update_materials(material_list):
 	for m in material_list:
 		if m is SpatialMaterial:
 			m.albedo_color = albedo_color
-			m.albedo_texture = texture_albedo
+			m.albedo_texture = generated_textures.albedo.texture
 			m.metallic = metallic
-			m.metallic_texture = texture_metallic
+			m.metallic_texture = generated_textures.metallic.texture
 			m.roughness = roughness
-			m.roughness_texture = texture_roughness
-			if texture_emission != null:
+			m.roughness_texture = generated_textures.roughness.texture
+			if generated_textures.emission.texture != null:
 				m.emission_enabled = true
 				m.emission_energy = emission_energy
-				m.emission_texture = texture_emission
+				m.emission_texture = generated_textures.emission.texture
 			else:
 				m.emission_enabled = false
-			if texture_normal_map != null:
+			if generated_textures.normal_map.texture != null:
 				m.normal_enabled = true
-				m.normal_texture = texture_normal_map
+				m.normal_texture = generated_textures.normal_map.texture
 			else:
 				m.normal_enabled = false
-			if texture_ambient_occlusion != null:
+			if generated_textures.ambient_occlusion.texture != null:
 				m.ao_enabled = true
 				m.ao_light_affect = ao_light_affect
-				m.ao_texture = texture_ambient_occlusion
+				m.ao_texture = generated_textures.ambient_occlusion.texture
 			else:
 				m.ao_enabled = false
-			if texture_depth_map != null:
+			if generated_textures.depth_map.texture != null:
 				m.depth_enabled = true
 				m.depth_scale = depth_scale
-				m.depth_texture = texture_depth_map
+				m.depth_texture = generated_textures.depth_map.texture
 			else:
 				m.depth_enabled = false
 

addons/procedural_material/nodes/material.tscn

@@ -5,7 +5,7 @@
 [sub_resource type="Theme" id=1]
 
 
-[node name="Material" type="GraphNode" index="0"]
+[node name="Material" type="GraphNode"]
 
 anchor_left = 0.0
 anchor_top = 0.0

addons/procedural_material/nodes/normal_map.gd

@@ -23,6 +23,9 @@ func _ready():
 	initialize_properties([ $amount ])
 
 func _get_shader_code(uv):
+	var src = get_source()
+	if src == null:
+		return { defs="", code="" }
 	var convolution = CONVOLUTION
 	convolution.scale_before_normalize = amount
-	return get_shader_code_convolution(convolution, uv)
+	return get_shader_code_convolution(src, convolution, uv)

addons/procedural_material/nodes/pattern.gd

@@ -7,7 +7,7 @@ var x_scale = 4.0
 var y_wave = 0
 var y_scale = 4.0
 
-const WAVE_FCT = [ "wave_sin", "wave_triangle", "wave_square", "fract" ]
+const WAVE_FCT = [ "wave_sin", "wave_triangle", "wave_square", "fract", "wave_constant" ]
 const MIX_FCT = [ "mix_multiply", "mix_add", "mix_max", "mix_min", "mix_xor", "mix_pow" ]
 
 func _ready():

addons/procedural_material/nodes/pattern.tscn

@@ -5,7 +5,7 @@
 [sub_resource type="Theme" id=1]
 
 
-[node name="Pattern" type="GraphNode"]
+[node name="Pattern" type="GraphNode" index="0"]
 
 anchor_left = 0.0
 anchor_top = 0.0
@@ -181,7 +181,7 @@ group = null
 text = "Sine"
 flat = false
 align = 0
-items = [ "Sine", null, false, 0, null, "Triangle", null, false, 1, null, "Square", null, false, 2, null, "Sawtooth", null, false, 3, null ]
+items = [ "Sine", null, false, 0, null, "Triangle", null, false, 1, null, "Square", null, false, 2, null, "Sawtooth", null, false, 3, null, "Constant", null, false, 4, null ]
 selected = 0
 _sections_unfolded = [ "Rect" ]
 
@@ -276,7 +276,7 @@ group = null
 text = "Sine"
 flat = false
 align = 0
-items = [ "Sine", null, false, 0, null, "Triangle", null, false, 1, null, "Square", null, false, 2, null, "Sawtooth", null, false, 3, null ]
+items = [ "Sine", null, false, 0, null, "Triangle", null, false, 1, null, "Square", null, false, 2, null, "Sawtooth", null, false, 3, null, "Constant", null, false, 4, null ]
 selected = 0
 _sections_unfolded = [ "Rect" ]
 

addons/procedural_material/preview.gd

@@ -8,9 +8,12 @@ const ENVIRONMENTS = [
 ]
 
 func _ready():
-	var m = $MaterialPreview/Objects/Cube.get_surface_material(0).duplicate()
+	var m
+	m = $MaterialPreview/Objects/Cube.get_surface_material(0).duplicate()
 	$MaterialPreview/Objects/Cube.set_surface_material(0, m)
 	$MaterialPreview/Objects/Cylinder.set_surface_material(0, m)
+	m = $MaterialPreview/Objects/Sphere.get_surface_material(0).duplicate()
+	$MaterialPreview/Objects/Sphere.set_surface_material(0, m)
 	$ObjectRotate.play("rotate")
 	$Preview2D.material = $Preview2D.material.duplicate(true)
 	_on_Environment_item_selected($Config/Environment.selected)

examples/rock.ptex

@@ -1 +1 @@
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