first commit

addons/zylann.hterrain/tools/minimap/minimap_normal.gdshader

@@ -0,0 +1,24 @@
+shader_type canvas_item;
+
+uniform sampler2D u_normalmap;
+uniform sampler2D u_globalmap;
+uniform vec3 u_light_direction = vec3(0.5, -0.7, 0.2);
+
+vec3 unpack_normal(vec4 rgba) {
+	return rgba.xzy * 2.0 - vec3(1.0);
+}
+
+void fragment() {
+	vec3 albedo = texture(u_globalmap, UV).rgb;
+	// Undo sRGB
+	// TODO I don't know what is correct tbh, this didn't work well
+	//albedo *= pow(albedo, vec3(0.4545));
+	//albedo *= pow(albedo, vec3(1.0 / 0.4545));
+	albedo = sqrt(albedo);
+	
+	vec3 normal = unpack_normal(texture(u_normalmap, UV));
+	float g = max(-dot(u_light_direction, normal), 0.0);
+	
+	COLOR = vec4(albedo * g, 1.0);
+}
+