Sun lighting

1 files changed, 7 insertions, 1 deletions

diff --git a/assets/shaders/fragment.glsl b/assets/shaders/fragment.glsl
index f8e9e46..eca50d9 100644
--- a/assets/shaders/fragment.glsl
+++ b/assets/shaders/fragment.glsl
@@ -1,11 +1,17 @@
 #version 330 core
 
 uniform sampler2D tex;
+uniform vec3 sun_direction;
 
+in vec3 surface_normal;
 in vec2 frag_tex_coord;
 
 out vec4 color;
 
 void main() {
-    color = texture(tex, frag_tex_coord);
+    float brightness = dot(normalize(surface_normal), normalize(-sun_direction));
+    vec3 diffuse = vec3(max(brightness, 0.3));
+
+    color = vec4(diffuse, 1.0) * texture(tex, frag_tex_coord);
+    // color = texture(tex, frag_tex_coord);
 }
\ No newline at end of file