From e9504a3b90ef081dcd622381694f6c51e2844c2d Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Wed, 22 May 2024 22:42:43 +0200
Subject: feat(engine): add support for multiple point lights

---
 engine/fragment.glsl | 46 ++++++++++++++++++----------------------------
 1 file changed, 18 insertions(+), 28 deletions(-)

(limited to 'engine/fragment.glsl')

diff --git a/engine/fragment.glsl b/engine/fragment.glsl
index 9becd4c..6e852f3 100644
--- a/engine/fragment.glsl
+++ b/engine/fragment.glsl
@@ -2,6 +2,8 @@
 
 #preinclude "light.glsl"
 
+#define MAX_POINT_LIGHT_CNT 64
+
 out vec4 FragColor;
 
 in vec2 in_texture_coords;
@@ -12,37 +14,25 @@ in vec3 in_normal;
 uniform vec3 view_pos;
 uniform sampler2D input_texture;
 uniform Material material;
-uniform PointLight light;
+uniform PointLight point_lights[MAX_POINT_LIGHT_CNT];
+uniform int point_light_cnt;
 
 void main()
 {
 	vec3 ambient_light = calc_ambient_light(material, in_texture_coords);
 
-	vec3 light_direction = normalize(light.position - in_frag_pos);
-	vec3 norm = normalize(in_normal);
-
-	vec3 diffuse_light = calc_diffuse_light(
-		material,
-		light,
-		light_direction,
-		norm,
-		in_texture_coords
-	);
-
-	vec3 specular_light = calc_specular_light(
-		material,
-		light,
-		light_direction,
-		norm,
-		view_pos,
-		in_frag_pos,
-		in_texture_coords
-	);
-
-	float attenuation = calc_attenuation(light, in_frag_pos);
-
-	diffuse_light *= attenuation;
-	specular_light *= attenuation;
-
-	FragColor = vec4((ambient_light + diffuse_light + specular_light), 1.0);
+	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],
+			in_frag_pos,
+			in_normal,
+			in_texture_coords,
+			view_pos,
+			material
+		);
+	}
+
+	FragColor = vec4((ambient_light + point_light_sum), 1.0);
 }
-- 
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