initial commit

shaders/door.gdshader

@@ -0,0 +1,19 @@
+shader_type spatial;
+
+uniform sampler2D door_texture : source_color, filter_nearest, repeat_enable;
+uniform vec3 uv_scale = vec3(3.0, 2.0, 3.0);
+
+varying float is_back_face;
+
+void vertex() {
+	// NORMAL is in model space here. The -Z face has NORMAL.z == -1.
+	is_back_face = step(NORMAL.z, -0.5);
+}
+
+void fragment() {
+    vec2 uv = UV * uv_scale.xy;
+    if (is_back_face > 0.5) {
+        uv.x = -uv.x;
+    }
+    ALBEDO = texture(door_texture, uv).rgb;
+}