initial setup

shaders/agent_shader.gdshader

@@ -0,0 +1,8 @@
+shader_type canvas_item;
+
+uniform sampler2D sim_texture;
+
+void fragment() {
+	vec3 c = texture(sim_texture, UV).rgb;
+	COLOR = vec4(c, 1.0);
+}

shaders/dissolve.gdshader

@@ -0,0 +1,11 @@
+shader_type canvas_item;
+
+uniform sampler2D sim_texture;
+
+uniform float decay_factor;
+
+void fragment() {
+	float c = texture(sim_texture, UV).r;
+	c = c * decay_factor;
+	COLOR = vec4(c, c, c, 1.0);
+}

shaders/dissolve.gdshader.uid

@@ -0,0 +1 @@
+uid://bj3v35wyy32la

shaders/trail_shader.gdshader

@@ -1,8 +0,0 @@
-shader_type canvas_item;
-
-void fragment() {
-	vec3 c1 = vec3(0.0, 0.4, 0.4);
-	vec3 c2 = vec3(0.4, 0.0, 0.4);
-	vec3 cout = mix(c1, c2, UV.x);
-	COLOR = vec4(cout, 1.0);
-}

shaders/view_simulation.gdshader

@@ -1,6 +1,6 @@
 shader_type canvas_item;
 
-uniform sampler2D view_texture;
+uniform sampler2D sim_texture;
 
 void fragment() {
 	vec3 v = texture(view_texture, UV).rgb;