feat(engine): add basic flat lighting

1 files changed, 34 insertions, 0 deletions

diff --git a/engine/light.glsl b/engine/light.glsl
new file mode 100644
index 0000000..3f1c601
--- /dev/null
+++ b/engine/light.glsl
@@ -0,0 +1,34 @@
+#version 330 core
+
+uniform vec3 light_color;
+uniform vec3 light_pos;
+
+uniform float ambient_light_strength;
+uniform float specular_light_strength;
+
+uniform uint specular_shininess;
+
+vec3 calc_diffuse_light(in vec3 light_dir, in vec3 norm)
+{
+	float diff = max(dot(norm, light_dir), 0.0);
+
+	return diff * light_color;
+}
+
+vec3 calc_specular_light(
+	in vec3 light_dir,
+	in vec3 norm,
+	in vec3 view_pos,
+	in vec3 frag_pos
+)
+{
+	vec3 view_direction = normalize(view_pos - frag_pos);
+
+	vec3 reflect_direction = reflect(-light_dir, norm);
+	
+	float spec =
+		pow(max(dot(view_direction, reflect_direction), 0.0), specular_shininess);
+
+	return specular_light_strength * spec * light_color;
+}
+