building a pure graphics pipeline version of this

shaders/view_simulation.gdshader

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