SHADER

shader/includes/refraction.gdshaderinc

@@ -0,0 +1,36 @@
+group_uniforms Refraction;
+uniform float refraction : hint_range(-16, 16) = 0.05;
+uniform float blurriness : hint_range(0.0, 1.0) = 0.0;
+group_uniforms;
+
+uniform sampler2D screen_texture :
+		hint_screen_texture,
+		repeat_disable,
+		filter_linear_mipmap;
+
+uniform sampler2D depth_texture :
+		hint_depth_texture,
+		repeat_disable,
+		filter_linear_mipmap;
+
+vec3 refraction_fragment(
+		float alpha,
+		vec3 normal,
+		vec2 screen_uv,
+		float depth
+) {
+	float amount = 1.0 - alpha;
+	vec2 offset = screen_uv - normal.xy * refraction;
+	float image_depth = texture(depth_texture, offset).r;
+	return image_depth < depth
+			? textureLod(
+					screen_texture,
+					screen_uv,
+					blurriness * 8.0
+			).rgb * amount
+			: textureLod(
+					screen_texture,
+					offset,
+					blurriness * 8.0
+			).rgb * amount;
+}