adding gfx and ui stuff

gfx/assets/shaders/phong.fragment.glsl

@@ -0,0 +1,29 @@
+#version 330 core
+layout(location = 0) out vec4 frag_color;
+
+uniform vec3 light_pos;
+uniform vec4 solid_color;
+uniform vec3 camera;
+
+in vec3 normal;
+in vec3 frag_position;
+
+void main() {
+    vec4 light_color = vec4(1, 1, 1, 1);
+    vec3 normal_norm = normalize(normal);
+    vec3 light_direction_norm = normalize(light_pos - frag_position);
+
+    float ambient_strength = 0.15;
+    vec4 ambient = ambient_strength * light_color;
+
+    float diffuse_strength = max(dot(normal_norm, light_direction_norm), 0.0);
+    vec4 diffuse = diffuse_strength * light_color;
+
+    float specular_strength = 0.9;
+    vec3 view_direction_norm = normalize(camera - frag_position);
+    vec3 reflect_dir = reflect(-light_direction_norm, normal_norm);
+    float spec = pow(max(dot(view_direction_norm, reflect_dir), 0.0), 32);
+    vec4 specular = specular_strength * spec * light_color;
+
+    frag_color = specular + (ambient + diffuse) * solid_color;
+}