feat(engine): add basic flat lighting

1 files changed, 7 insertions, 0 deletions

diff --git a/engine/vertex.glsl b/engine/vertex.glsl
index 61782c2..3279036 100644
--- a/engine/vertex.glsl
+++ b/engine/vertex.glsl
@@ -2,9 +2,12 @@
 layout (location = 0) in vec3 pos;
 layout (location = 1) in vec3 color;
 layout (location = 2) in vec2 texture_coords;
+layout (location = 3) in vec3 normal;
 
 out vec3 in_frag_color;
+out vec3 in_frag_pos;
 out vec2 in_texture_coords;
+out vec3 in_normal;
 
 uniform mat4 model;
 uniform mat4 view;
@@ -15,5 +18,9 @@ void main()
     gl_Position = projection * view * model * vec4(pos, 1.0);
 
 	in_frag_color = color;
+	in_frag_pos = vec3(model * vec4(pos, 1.0));
 	in_texture_coords = texture_coords;
+
+	// TODO: Do this using CPU for performance increase
+	in_normal = mat3(transpose(inverse(model))) * normal;
 }