Add basic directional light

1 files changed, 10 insertions, 1 deletions

diff --git a/shaders/fragment.glsl b/shaders/fragment.glsl
index da55675..e3bd9db 100644
--- a/shaders/fragment.glsl
+++ b/shaders/fragment.glsl
@@ -1,6 +1,15 @@
 #version 410 core
 out vec4 frag_colour;
 uniform vec3 face_colors[6];
+uniform vec3 light_color;
+in vec3 normal;
+in vec3 frag_pos;
 void main() {
-  frag_colour = vec4( face_colors[gl_PrimitiveID/2], 1.0 );
+    vec3 ambient_color = vec3(0.1);
+    vec3 norm = normalize(normal);
+    vec3 light_dir = normalize(vec3(1.0f, 1.0f, 1.0f));
+    float diff = max(dot(norm, light_dir), 0.0);
+    vec3 diffuse = diff * vec3(1.0);
+
+    frag_colour = vec4((ambient_color + diffuse) * face_colors[gl_PrimitiveID/2], 1.0);
 };