SHADER

shader/includes/backlight.gdshaderinc

@@ -0,0 +1,23 @@
+#include "base-cel-shader.gdshaderinc"
+
+group_uniforms Backlight;
+uniform vec3 backlight : source_color;
+uniform sampler2D backlight_texture : hint_default_white;
+group_uniforms;
+
+vec3 backlight_fragment(vec2 uv) {
+	return backlight * texture(backlight_texture, uv).rgb;
+}
+
+vec3 backlight_diffuse(
+		vec3 albedo,
+		vec3 light_color,
+		vec3 light,
+		vec3 normal,
+		float attenuation,
+		vec3 backlight_color
+) {
+	float value = diffuse_sample(light, normal);
+	return albedo * light_color * attenuation
+			* (value + backlight_color * (1.0 - value));
+}