feat(engine): add point light attenuation

1 files changed, 14 insertions, 2 deletions

diff --git a/engine/light.glsl b/engine/light.glsl
index 49026ec..04a42f5 100644
--- a/engine/light.glsl
+++ b/engine/light.glsl
@@ -13,14 +13,17 @@ struct Material {
     float shininess;
 }; 
 
-struct Light {
+struct PointLight {
 	vec3 position;
     vec3 diffuse;
     vec3 specular;
+    float constant;
+    float linear;
+    float quadratic;
 }; 
   
 uniform Material material;
-uniform Light light;
+uniform PointLight light;
 
 vec3 calc_ambient_light(in vec2 texture_coords)
 {
@@ -56,4 +59,13 @@ vec3 calc_specular_light(
 	);
 }
 
+float calc_attenuation(in PointLight point_light, in vec3 position)
+{
+	float light_distance = length(point_light.position - position);
+
+	return 1.0 / (point_light.constant + point_light.linear
+		* light_distance + point_light.quadratic
+		* pow(light_distance, 2));
+}
+
 #endif