shaders!

resources/level_3.gdshader

@@ -0,0 +1,20 @@
+shader_type canvas_item;
+
+uniform sampler2D gradient_texture;
+
+void vertex() {
+	// Called for every vertex the material is visible on.
+}
+
+void fragment() {
+	vec4 existing_color = texture(TEXTURE, UV);
+	float grayscale_value = (existing_color.r + existing_color.g + existing_color.b)/3.0;
+	vec4 new_color = texture(gradient_texture, vec2(grayscale_value));
+	COLOR.rgb = new_color.rgb;
+	COLOR.a = existing_color.a;
+}
+
+//void light() {
+//	// Called for every pixel for every light affecting the CanvasItem.
+//	// Uncomment to replace the default light processing function with this one.
+//}