saving what I've done

project.godot

@@ -15,6 +15,12 @@ run/main_scene="uid://bf4ohdg0sfl8l"
 config/features=PackedStringArray("4.4", "Forward Plus")
 config/icon="res://icon.svg"
 
+[display]
+
+window/size/viewport_width=1920
+window/size/viewport_height=1080
+window/stretch/mode="viewport"
+
 [rendering]
 
 environment/defaults/default_clear_color=Color(0.0605303, 0.0605304, 0.0605303, 1)

shaders/agents_cs.glsl

@@ -7,8 +7,8 @@ layout(local_size_x = 64, local_size_y = 1, local_size_z = 1) in;
 layout(r32f,  binding = 0) uniform restrict readonly image2D current_trail;
 layout(r32f,  binding = 1) uniform restrict writeonly image2D output_trail;
 layout(binding = 2) restrict buffer AgentBuffer {
-    vec2 positions[1024];
-    float headings[1024];
+    vec2 positions[1024 * 1024];
+    float headings[1024 * 1024];
 } agent_buffer;
 
 layout(push_constant, std430) uniform Params {
@@ -19,13 +19,17 @@ layout(push_constant, std430) uniform Params {
 
 const float SPEED = 1.0;
 
+float random(vec2 coords) {
+   return fract(sin(dot(coords.xy, vec2(12.9898,78.233))) * 43758.5453);
+}
+
 vec2 loop_position(vec2 pos) {
     int width = params.texture_size.x;
     int height = params.texture_size.y;
     if (pos.x > width) pos.x = mod(pos.x, width);
     if (pos.y > height) pos.y = mod(pos.y, height);
-    if (pos.x < 0) pos.x = width - pos.x;
-    if (pos.y < 0) pos.y = height - pos.y;
+    if (pos.x < 0) pos.x = width + pos.x;
+    if (pos.y < 0) pos.y = height + pos.y;
     return pos;
 }
 

shaders/decay_cs.glsl

@@ -10,7 +10,7 @@ layout(r32f, set = 1, binding = 0) uniform restrict writeonly image2D output_ima
 
 // PushConstants
 layout(push_constant, std430) uniform Params {
-    vec2 texture_size;
+    ivec2 texture_size;
     float decay_factor;
     float dissipation_factor;
 } params;
@@ -20,11 +20,16 @@ float get_dissipation_from(ivec2 uv) {
     return v * params.dissipation_factor;
 }
 
-// ivec2 loop_position(vec2 pos) {
-//     int width = params.texture_size.x;
-//     int height = params.texture_size.y;
-//     return ivec2(mod(pos + params.texture_size, params.texture_size));
-// }
+ivec2 loop_position(ivec2 pos) {
+    int width = params.texture_size.x;
+    int height = params.texture_size.y;
+    vec2 looped = pos;
+    if (pos.x > width) looped.x = mod(pos.x, width);
+    if (pos.y > height) looped.y = mod(pos.y, height);
+    if (pos.x < 0) looped.x = width - pos.x;
+    if (pos.y < 0) looped.y = height - pos.y;
+    return ivec2(looped);
+}
 
 // The code we want to execute in each invocation
 void main() {
@@ -33,10 +38,10 @@ void main() {
     ivec2 uv = ivec2(gl_GlobalInvocationID.xy);
 
     ivec2 tl = ivec2(0, 0);
-    ivec2 up_uv = clamp(uv - ivec2(0, 1), tl, size);
-    ivec2 down_uv = clamp(uv + ivec2(0, 1), tl, size);
-    ivec2 left_uv = clamp(uv - ivec2(1, 0), tl, size);
-    ivec2 right_uv = clamp(uv + ivec2(1, 0), tl, size);
+    ivec2 up_uv = loop_position(uv - ivec2(0, 1));
+    ivec2 down_uv = loop_position(uv + ivec2(0, 1));
+    ivec2 left_uv = loop_position(uv - ivec2(1, 0));
+    ivec2 right_uv = loop_position(uv + ivec2(1, 0));
 
     // Just in case the texture size is not divisable by 8.
     if ((uv.x > size.x) || (uv.y > size.y)) {
@@ -51,6 +56,10 @@ void main() {
     new_v += get_dissipation_from(right_uv);
     new_v += get_dissipation_from(left_uv);
 
+    // Kill very old trails completely
+    // if (new_v < 0.001) {
+    //     new_v = 0;
+    // }
 
     // new_v = clamp(new_v, 0, 1);
 

slime_simulation.gd

@@ -12,7 +12,7 @@ extends Node2D
 @onready var mesh := $MeshInstance2D
 
 ## Needs to be changed from the shader as well
-const AGENTS: int = 1024
+const AGENTS: int = 1024 * 1024
 
 var texture: Texture2DRD
 var next_texture: int = 0

slime_simulation.tscn

@@ -10,19 +10,19 @@ shader = ExtResource("2_pxe3a")
 shader_parameter/trail_tex = SubResource("Texture2DRD_pxe3a")
 
 [sub_resource type="QuadMesh" id="QuadMesh_pxe3a"]
+size = Vector2(1920, 1080)
 
 [node name="SlimeSimulation" type="Node2D"]
 script = ExtResource("1_pxe3a")
-texture_size = Vector2i(1152, 648)
+texture_size = Vector2i(1920, 1080)
 decay_factor = 0.75
 dissipation_factor = 0.06
-sensor_angle = 8.0
+sensor_angle = 7.0
 sensor_distance = 20.0
 rng_seed = 8008
 
 [node name="MeshInstance2D" type="MeshInstance2D" parent="."]
 self_modulate = Color(0.581022, 0.701395, 0.890748, 1)
 material = SubResource("ShaderMaterial_pxe3a")
-position = Vector2(576, 324)
-scale = Vector2(1152, 648)
+position = Vector2(960, 540)
 mesh = SubResource("QuadMesh_pxe3a")