From 36886e343781bf0ddf7458d5c6db5b5724c918e4 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Thu, 23 May 2024 22:47:30 +0200
Subject: feat(engine): add directional light

---
 engine/fragment.glsl | 51 +++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 45 insertions(+), 6 deletions(-)

(limited to 'engine/fragment.glsl')

diff --git a/engine/fragment.glsl b/engine/fragment.glsl
index cc46f36..5bf5ff2 100644
--- a/engine/fragment.glsl
+++ b/engine/fragment.glsl
@@ -3,7 +3,7 @@
 #preinclude "light.glsl"
 #preinclude "vertex_data.glsl"
 
-#define MAX_POINT_LIGHT_CNT 64
+#define MAX_LIGHT_CNT 64
 
 out vec4 FragColor;
 
@@ -12,23 +12,62 @@ in VertexData vertex_data;
 uniform vec3 view_pos;
 uniform sampler2D input_texture;
 uniform Material material;
-uniform PointLight point_lights[MAX_POINT_LIGHT_CNT];
+
+uniform PointLight point_lights[MAX_LIGHT_CNT];
 uniform int point_light_cnt;
 
+uniform DirectionalLight directional_lights[MAX_LIGHT_CNT];
+uniform int directional_light_cnt;
+
 void main()
 {
 	vec3 ambient_light = calc_ambient_light(material, vertex_data.texture_coords);
 
+	vec3 directional_light_sum = vec3(0.0, 0.0, 0.0);
+
+	for (int dl_index = 0; dl_index < directional_light_cnt; dl_index++) {
+		CalculatedLight calculated_dir_light;
+
+		calc_light(
+			// Negated since we want the light to point from the light direction
+			normalize(-directional_lights[dl_index].direction),
+			directional_lights[dl_index].phong,
+			vertex_data,
+			view_pos,
+			material,
+			calculated_dir_light
+		);
+
+		directional_light_sum +=
+			calculated_dir_light.diffuse + calculated_dir_light.specular;
+	}
+
 	vec3 point_light_sum = vec3(0.0, 0.0, 0.0);
 
 	for (int pl_index = 0; pl_index < point_light_cnt; pl_index++) {
-		point_light_sum += calc_point_light(
-			point_lights[pl_index],
+		vec3 light_direction =
+			normalize(point_lights[pl_index].position - vertex_data.world_space_pos);
+
+		CalculatedLight calculated_point_light;
+
+		calc_light(
+			light_direction,
+			point_lights[pl_index].phong,
 			vertex_data,
 			view_pos,
-			material
+			material,
+			calculated_point_light
 		);
+
+		float attenuation =
+			calc_attenuation(point_lights[pl_index], vertex_data.world_space_pos);
+
+		calculated_point_light.diffuse *= attenuation;
+		calculated_point_light.specular *= attenuation;
+
+		point_light_sum +=
+			calculated_point_light.diffuse + calculated_point_light.specular;
 	}
 
-	FragColor = vec4((ambient_light + point_light_sum), 1.0);
+	FragColor = vec4((ambient_light + directional_light_sum + point_light_sum), 1.0);
 }
-- 
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