bc5 normal maps

shaders/triangle.frag

@@ -21,7 +21,7 @@ layout(location = 3) in mat3 tbn;
 layout(location = 0) out vec4 out_color;
 
 void main() {
-    vec3 normal_cam_u = texture(normal_tex, tex_coords).rgb;
+    vec3 normal_cam_u = vec3(texture(normal_tex, tex_coords).rg, 1.0);
     normal_cam_u = normal_cam_u * 2.0 - 1.0;
     normal_cam_u = normalize(tbn * normal_cam_u);