slowly descending into madness

particle_data.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://coag6vc2dufc8"
+path="res://.godot/imported/particle_data.png-716496d42425e62be8fcb686aebac5dd.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://particle_data.png"
+dest_files=["res://.godot/imported/particle_data.png-716496d42425e62be8fcb686aebac5dd.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

shaders/point_draw_shader.gdshader

@@ -0,0 +1,25 @@
+shader_type canvas_item;
+//render_mode skip_vertex_transform;
+
+uniform sampler2D point_texture;
+
+uniform ivec2 point_texture_size;
+uniform ivec2 canvas_size;
+
+void vertex() {
+	int id = INSTANCE_ID;
+	int x = id % point_texture_size.x;
+	int y = id / point_texture_size.x;
+	// This feels dumb
+	vec2 uv = vec2(float(x), float(y));
+	vec4 point_data = texture(point_texture, uv);
+
+	vec2 pos = point_data.xy;
+	float angle = point_data.z;
+
+	VERTEX=pos;
+}
+
+void fragment() {
+	COLOR=vec4(1, 1, 1, 1);
+}

shaders/point_draw_shader.gdshader.uid

@@ -0,0 +1 @@
+uid://bq044vr2240p4

shaders/point_update_shader.gdshader

@@ -7,6 +7,8 @@ uniform ivec2 point_texture_size;
 uniform ivec2 canvas_size;
 uniform float point_speed;
 
+varying vec4 data;
+
 // Snippets of code drawn from https://gist.github.com/Bleuje/1e497df4505ca24c39ab3930a95700b3
 float gn(in vec2 coordinate, in float seed){
     return fract(tan(distance(coordinate*(seed+0.118446744073709551614), vec2(0.118446744073709551614, 0.314159265358979323846264)))*0.141421356237309504880169);
@@ -17,7 +19,7 @@ float trail_at_pos(vec2 uv) {
 }
 
 void vertex() {
-	int id = VERTEX_ID;
+	int id = INSTANCE_ID;
 	int x = id % point_texture_size.x;
 	int y = id / point_texture_size.x;
 	// This feels dumb
@@ -25,14 +27,12 @@ void vertex() {
 	vec4 point_data = texture(point_texture, uv);
 	
 	vec2 pos = point_data.xy;
-	pos += vec2(5000.0, 5000.0);
 	float angle = point_data.z;
 
-	
+	//COLOR = vec4(0.2, 0.0, 0.0, 1.0)
-	VERTEX = pos/vec2(canvas_size);
+	data=vec4(pos, angle, point_data.z);
-	//COLOR = vec4(pos, angle, point_data.z)
-	COLOR=vec4(1, 1, 1, 1);
 }
 
 void fragment() {
+	COLOR=data;
 }

slime_simulation.gd

@@ -13,12 +13,15 @@ var point_texture_height: int:
 @export var decay_factor: float = 0.95
 @export var rng_seed: int = 10074
 
-@onready var points: MultiMesh = $SubViewport/PointMesh.multimesh
+@onready var points: MultiMesh = %PointUpdateViewport/PointMesh.multimesh
+@onready var points_draw: MultiMesh = %PointDrawViewport/PointMesh.multimesh
 @onready var view := $View
-@onready var pass_viewport := $SubViewport
+@onready var point_update_vp := %PointUpdateViewport
-@onready var pass2_viewport := $SubViewport2
+@onready var trail_update_vp := %TrailUpdateViewport
-@onready var point_shader: ShaderMaterial = $SubViewport/PointMesh.material
+@onready var point_draw_vp := %PointDrawViewport
-@onready var trail_shader: ShaderMaterial = $SubViewport2/Pass.material
+@onready var point_shader: ShaderMaterial = %PointUpdateViewport/PointMesh.material
+@onready var trail_shader: ShaderMaterial = %TrailUpdateViewport/Pass.material
+@onready var point_draw_shader: ShaderMaterial = %PointDrawViewport/PointMesh.material
 
 var _frame_count: int = 0
 var point_texture: ImageTexture = null
@@ -30,9 +33,9 @@ func populate_points() -> void:
 	var point_data_image: Image = Image.create_empty(point_texture_width, point_texture_height, false, Image.FORMAT_RGBAF)
 	for i in point_count:
 		var pos: Vector2 = Vector2(
-			rng.randf_range(0, render_width), rng.randf_range(0, render_height)
+			rng.randf_range(0, 1.0), rng.randf_range(0, 1.0)
 		)
-		var angle: float = rng.randf_range(0, TAU)
+		var angle: float = rng.randf_range(0, 1.0)
 		
 		var x = i % point_texture_width
 		@warning_ignore("integer_division")
@@ -40,13 +43,21 @@ func populate_points() -> void:
 		point_data_image.set_pixel(x, y, Color(pos.x, pos.y, angle, 1.0))
 		
 		# Lets keep original positions at 0 instead of doing the below
-		var t: Transform2D = Transform2D(0, pos)
+		var t: Transform2D = Transform2D()
 		points.set_instance_transform_2d(i, t)
+
+	var render_size := Vector2i(render_width, render_height);
+	var point_texture_size := Vector2i(point_texture_width, point_texture_height)
 	point_texture = ImageTexture.create_from_image(point_data_image)
 	point_shader.set_shader_parameter("point_texture", point_texture)
-	point_shader.set_shader_parameter("point_texture_size", Vector2(point_texture_width, point_texture_height))
+	point_shader.set_shader_parameter("point_texture_size", point_texture_size)
-	point_shader.set_shader_parameter("canvas_size", Vector2(1920, 1080))
+	point_shader.set_shader_parameter("canvas_size", render_size)
 	point_shader.set_shader_parameter("point_speed", point_speed)
+	point_draw_shader.set_shader_parameter("point_texture", point_texture)
+	point_draw_shader.set_shader_parameter("point_texture_size", point_texture_size)
+	point_draw_shader.set_shader_parameter("canvas_size", render_size)
+
+	points_draw = points
 
 
 func _ready():
@@ -75,14 +86,16 @@ func _create_initial_sim_texture(width: int, height: int) -> ImageTexture:
 func _initialize_render(_width: int, _height: int) -> void:
 	rd = RenderingServer.get_rendering_device()
 
-	trail_shader.set_shader_parameter("trail_texture", pass_viewport.get_texture().get_rid())
+	trail_shader.set_shader_parameter("trail_texture", point_update_vp.get_texture().get_rid())
 	trail_shader.set_shader_parameter("decay_factor", decay_factor)
 
 
 func _render_process(frame_count: int) -> void:
 	if frame_count > 0:
-		point_shader.set_shader_parameter("trail_texture", pass2_viewport.get_texture().get_rid())
+		point_shader.set_shader_parameter("trail_texture", trail_update_vp.get_texture().get_rid())
+		point_shader.set_shader_parameter("agent_texture", point_update_vp.get_texture().get_rid())
 
+	view.texture = point_texture.get_rid()
 	trail_shader.set_shader_parameter("decay_factor", decay_factor)
-	#trail_shader.set_shader_parameter("trail_texture", pass_viewport.get_texture().get_rid())
+	#trail_shader.set_shader_parameter("trail_texture", point_update_vp.get_texture().get_rid())
-	# point_shader.set_shader_parameter("sim_texture", pass2_viewport.get_texture().get_rid())
+	# point_shader.set_shader_parameter("sim_texture", trail_update_vp.get_texture().get_rid())

slime_simulation.tscn

@@ -1,25 +1,15 @@
-[gd_scene load_steps=11 format=3 uid="uid://0q5qa7yiya83"]
+[gd_scene load_steps=13 format=3 uid="uid://0q5qa7yiya83"]
 
 [ext_resource type="Script" uid="uid://c6et88s5hp5c7" path="res://slime_simulation.gd" id="1_s6nlv"]
-[ext_resource type="Shader" uid="uid://cwt4a55lblykn" path="res://shaders/point_shader.gdshader" id="2_pxe3a"]
+[ext_resource type="Shader" uid="uid://cwt4a55lblykn" path="res://shaders/point_update_shader.gdshader" id="2_pxe3a"]
+[ext_resource type="Shader" uid="uid://bq044vr2240p4" path="res://shaders/point_draw_shader.gdshader" id="3_g2c28"]
 [ext_resource type="Shader" uid="uid://bj3v35wyy32la" path="res://shaders/dissolve.gdshader" id="3_s6nlv"]
 
 [sub_resource type="QuadMesh" id="QuadMesh_h0wwo"]
 size = Vector2(1920, 1080)
 
-[sub_resource type="ViewportTexture" id="ViewportTexture_s6nlv"]
+[sub_resource type="ViewportTexture" id="ViewportTexture_g2c28"]
-viewport_path = NodePath("SubViewport")
+viewport_path = NodePath("TrailUpdateViewport/PointDrawViewport")
-
-[sub_resource type="ShaderMaterial" id="ShaderMaterial_s6nlv"]
-shader = ExtResource("2_pxe3a")
-shader_parameter/point_texture_size = Vector2i(0, 0)
-shader_parameter/canvas_size = Vector2i(0, 0)
-shader_parameter/point_speed = 0.0
-
-[sub_resource type="PointMesh" id="PointMesh_g2c28"]
-
-[sub_resource type="MultiMesh" id="MultiMesh_vkm4v"]
-mesh = SubResource("PointMesh_g2c28")
 
 [sub_resource type="ShaderMaterial" id="ShaderMaterial_g2c28"]
 shader = ExtResource("3_s6nlv")
@@ -28,26 +18,32 @@ shader_parameter/decay_factor = 0.99
 [sub_resource type="QuadMesh" id="QuadMesh_s6nlv"]
 size = Vector2(1920, 1080)
 
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_vkm4v"]
+shader = ExtResource("3_g2c28")
+shader_parameter/point_texture_size = Vector2i(0, 0)
+shader_parameter/canvas_size = Vector2i(0, 0)
+
+[sub_resource type="PointMesh" id="PointMesh_g2c28"]
+
+[sub_resource type="MultiMesh" id="MultiMesh_vkm4v"]
+mesh = SubResource("PointMesh_g2c28")
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_s6nlv"]
+shader = ExtResource("2_pxe3a")
+shader_parameter/point_texture_size = Vector2i(0, 0)
+shader_parameter/canvas_size = Vector2i(0, 0)
+shader_parameter/point_speed = 0.0
+
 [node name="SlimeSimulation" type="Node2D"]
 script = ExtResource("1_s6nlv")
 
 [node name="View" type="MeshInstance2D" parent="."]
 position = Vector2(960, 540)
 mesh = SubResource("QuadMesh_h0wwo")
-texture = SubResource("ViewportTexture_s6nlv")
+texture = SubResource("ViewportTexture_g2c28")
 
-[node name="SubViewport" type="SubViewport" parent="."]
+[node name="TrailUpdateViewport" type="SubViewport" parent="."]
-disable_3d = true
+unique_name_in_owner = true
-transparent_bg = true
-handle_input_locally = false
-size = Vector2i(1920, 1080)
-render_target_update_mode = 4
-
-[node name="PointMesh" type="MultiMeshInstance2D" parent="SubViewport"]
-material = SubResource("ShaderMaterial_s6nlv")
-multimesh = SubResource("MultiMesh_vkm4v")
-
-[node name="SubViewport2" type="SubViewport" parent="."]
 disable_3d = true
 transparent_bg = true
 handle_input_locally = false
@@ -55,7 +51,31 @@ snap_2d_vertices_to_pixel = true
 size = Vector2i(1920, 1080)
 render_target_update_mode = 4
 
-[node name="Pass" type="MeshInstance2D" parent="SubViewport2"]
+[node name="Pass" type="MeshInstance2D" parent="TrailUpdateViewport"]
 material = SubResource("ShaderMaterial_g2c28")
 position = Vector2(960, 540)
 mesh = SubResource("QuadMesh_s6nlv")
+
+[node name="PointDrawViewport" type="SubViewport" parent="TrailUpdateViewport"]
+unique_name_in_owner = true
+disable_3d = true
+transparent_bg = true
+handle_input_locally = false
+size = Vector2i(1920, 1080)
+render_target_update_mode = 4
+
+[node name="PointMesh" type="MultiMeshInstance2D" parent="TrailUpdateViewport/PointDrawViewport"]
+material = SubResource("ShaderMaterial_vkm4v")
+multimesh = SubResource("MultiMesh_vkm4v")
+
+[node name="PointUpdateViewport" type="SubViewport" parent="TrailUpdateViewport/PointDrawViewport"]
+unique_name_in_owner = true
+disable_3d = true
+transparent_bg = true
+handle_input_locally = false
+size = Vector2i(1920, 1080)
+render_target_update_mode = 4
+
+[node name="PointMesh" type="MultiMeshInstance2D" parent="TrailUpdateViewport/PointDrawViewport/PointUpdateViewport"]
+material = SubResource("ShaderMaterial_s6nlv")
+multimesh = SubResource("MultiMesh_vkm4v")