feat(engine): add basic flat lighting

1 files changed, 21 insertions, 1 deletions

diff --git a/engine/fragment-texture.glsl b/engine/fragment-texture.glsl
index a4d378b..2948a2e 100644
--- a/engine/fragment-texture.glsl
+++ b/engine/fragment-texture.glsl
@@ -1,11 +1,31 @@
 #version 330 core
+
+#preinclude "light.glsl"
+
 out vec4 FragColor;
 
 in vec2 in_texture_coords;
 
+in vec3 in_frag_pos;
+in vec3 in_normal;
+
+uniform vec3 view_pos;
+
 uniform sampler2D input_texture;
 
 void main()
 {
-	FragColor = texture(input_texture, in_texture_coords);
+	vec3 ambient_light = ambient_light_strength * light_color;
+
+	vec3 light_direction = normalize(light_pos - in_frag_pos);
+	vec3 norm = normalize(in_normal);
+
+	vec3 diffuse_light = calc_diffuse_light(light_direction, norm);
+
+	vec3 specular_light =
+		calc_specular_light(light_direction, norm, view_pos, in_frag_pos);
+
+	vec4 light = vec4((ambient_light + diffuse_light + specular_light), 1.0);
+
+	FragColor = light * texture(input_texture, in_texture_coords);
 }