SHADER

shader/outline.gdshader

@@ -0,0 +1,25 @@
+shader_type spatial;
+
+render_mode cull_front, unshaded, depth_draw_never;
+
+global uniform vec4 outline_color;
+global uniform float outline_width;
+
+void vertex() {
+	vec4 clip_position = 
+			PROJECTION_MATRIX *
+			(MODELVIEW_MATRIX * vec4(VERTEX, 1.0));
+	vec3 clip_normal =
+			mat3(PROJECTION_MATRIX) *
+			(mat3(MODELVIEW_MATRIX) * NORMAL);
+	clip_position.xy +=
+			normalize(clip_normal.xy) /
+			VIEWPORT_SIZE *
+			clip_position.w *
+			outline_width;
+	POSITION = clip_position;
+}
+
+void fragment() {
+	ALBEDO = outline_color.rgb;
+}