From eb270458de24c7346adc1ab0a4fe1c409a2008ae Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Thu, 23 May 2024 19:37:47 +0200
Subject: refactor(engine): seperate light properties in shader

---
 engine/light.glsl | 35 ++++++++++++++++++++++++-----------
 1 file changed, 24 insertions(+), 11 deletions(-)

(limited to 'engine/light.glsl')

diff --git a/engine/light.glsl b/engine/light.glsl
index 6bc730a..9f51237 100644
--- a/engine/light.glsl
+++ b/engine/light.glsl
@@ -3,7 +3,8 @@
 #ifndef LIGHT_GLSL
 #define LIGHT_GLSL
 
-struct Material {
+struct Material
+{
 	vec3 ambient;
 	vec3 diffuse;
 	vec3 specular;
@@ -13,15 +14,26 @@ struct Material {
 	float shininess;
 };
 
-struct PointLight {
-	vec3 position;
+struct LightPhong
+{
 	vec3 diffuse;
 	vec3 specular;
+};
+
+struct AttenuationProperties
+{
 	float constant;
 	float linear;
 	float quadratic;
 };
 
+struct PointLight
+{
+	LightPhong phong;
+	vec3 position;
+	AttenuationProperties attenuation_props;
+};
+
 vec3 calc_ambient_light(in Material material, in vec2 texture_coords)
 {
 	return vec3(texture(material.ambient_map, texture_coords)) * material.ambient;
@@ -29,7 +41,7 @@ vec3 calc_ambient_light(in Material material, in vec2 texture_coords)
 
 vec3 calc_diffuse_light(
 	in Material material,
-	in PointLight light,
+	in LightPhong light_phong,
 	in vec3 light_dir,
 	in vec3 norm,
 	in vec2 texture_coords
@@ -37,14 +49,14 @@ vec3 calc_diffuse_light(
 {
 	float diff = max(dot(norm, light_dir), 0.0);
 
-	return light.diffuse * (
+	return light_phong.diffuse * (
 		diff * (vec3(texture(material.diffuse_map, texture_coords)) * material.diffuse)
 	);
 }
 
 vec3 calc_specular_light(
 	in Material material,
-	in PointLight light,
+	in LightPhong light_phong,
 	in vec3 light_dir,
 	in vec3 norm,
 	in vec3 view_pos,
@@ -59,7 +71,7 @@ vec3 calc_specular_light(
 	float spec =
 		pow(max(dot(view_direction, reflect_direction), 0.0), material.shininess);
 
-	return light.specular * (
+	return light_phong.specular * (
 		spec * (vec3(texture(material.specular_map, texture_coords)) * material.specular)
 	);
 }
@@ -68,8 +80,9 @@ 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
+	return 1.0 / (point_light.attenuation_props.constant
+		+ point_light.attenuation_props.linear
+		* light_distance + point_light.attenuation_props.quadratic
 		* pow(light_distance, 2));
 }
 
@@ -87,7 +100,7 @@ vec3 calc_point_light(
 
 	vec3 diffuse_light = calc_diffuse_light(
 		material,
-		light,
+		light.phong,
 		light_direction,
 		norm,
 		texture_coords
@@ -95,7 +108,7 @@ vec3 calc_point_light(
 
 	vec3 specular_light = calc_specular_light(
 		material,
-		light,
+		light.phong,
 		light_direction,
 		norm,
 		view_pos,
-- 
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