From f47ce90430f36e74d713e22781a34f89149f7ea5 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Thu, 23 May 2024 20:57:35 +0200
Subject: refactor(engine): pass vertex data to fragment shader with struct

---
 engine/fragment.glsl | 13 ++-----------
 engine/vertex.glsl   | 13 +++++++------
 2 files changed, 9 insertions(+), 17 deletions(-)

diff --git a/engine/fragment.glsl b/engine/fragment.glsl
index afeef25..cc46f36 100644
--- a/engine/fragment.glsl
+++ b/engine/fragment.glsl
@@ -7,10 +7,7 @@
 
 out vec4 FragColor;
 
-in vec2 in_texture_coords;
-
-in vec3 in_frag_pos;
-in vec3 in_normal;
+in VertexData vertex_data;
 
 uniform vec3 view_pos;
 uniform sampler2D input_texture;
@@ -20,13 +17,7 @@ uniform int point_light_cnt;
 
 void main()
 {
-	VertexData vertex_data;
-
-	vertex_data.texture_coords = in_texture_coords;
-	vertex_data.world_space_pos = in_frag_pos;
-	vertex_data.world_space_normal = in_normal;
-
-	vec3 ambient_light = calc_ambient_light(material, in_texture_coords);
+	vec3 ambient_light = calc_ambient_light(material, vertex_data.texture_coords);
 
 	vec3 point_light_sum = vec3(0.0, 0.0, 0.0);
 
diff --git a/engine/vertex.glsl b/engine/vertex.glsl
index f282864..b57caa6 100644
--- a/engine/vertex.glsl
+++ b/engine/vertex.glsl
@@ -1,11 +1,12 @@
 #version 330 core
+
+#preinclude "vertex_data.glsl"
+
 layout (location = 0) in vec3 pos;
 layout (location = 1) in vec2 texture_coords;
 layout (location = 2) in vec3 normal;
 
-out vec3 in_frag_pos;
-out vec2 in_texture_coords;
-out vec3 in_normal;
+out VertexData vertex_data;
 
 uniform mat4 model;
 uniform mat4 view;
@@ -15,9 +16,9 @@ void main()
 {
 	gl_Position = projection * view * model * vec4(pos, 1.0);
 
-	in_frag_pos = vec3(model * vec4(pos, 1.0));
-	in_texture_coords = texture_coords;
+	vertex_data.world_space_pos = vec3(model * vec4(pos, 1.0));
+	vertex_data.texture_coords = texture_coords;
 
 	// TODO: Do this using CPU for performance increase
-	in_normal = mat3(transpose(inverse(model))) * normal;
+	vertex_data.world_space_normal = mat3(transpose(inverse(model))) * normal;
 }
-- 
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