From d4b61dd34b06119e87c8932ab7718d432dbc6a4f Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Wed, 22 May 2024 20:39:26 +0200
Subject: feat(engine): add point light attenuation

---
 engine/light.glsl | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

(limited to 'engine/light.glsl')

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
-- 
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