Pass directly normal to the fragment shader

src/main.rs

@@ -71,16 +71,12 @@ fn main() {
                 uniform mat4 persp_matrix;
                 uniform mat4 view_matrix;
 
-                // can't skip directly to fragment shader an unmodified variable?
-                in vec3 normal;
                 in uint index;
                 in float altitude;
 
-                out vec3 v_normal;
                 out vec2 v_tex_coords;
 
                 void main() {
-                    v_normal = normal;
                     uint index_mod = index % 6u;
                     uint index_div = index / 6u;
                     uint z = index_div / 250u;
@@ -110,7 +106,7 @@ fn main() {
             fragment: "
                 #version 140
 
-                in vec3 v_normal;
+                flat in vec3 normal;
                 in vec2 v_tex_coords;
                 out vec4 f_color;
                 flat in uint biome;
@@ -120,7 +116,7 @@ fn main() {
                 const vec3 LIGHT = vec3(0.0, -1.0, 0.0);
 
                 void main() {
-                    float lum = max(dot(normalize(v_normal), normalize(LIGHT)), 0.0);
+                    float lum = max(dot(normalize(normal), normalize(LIGHT)), 0.0);
 
                     if(biome == 0u) f_color = (0.3 + 0.7 * lum, 1.0) * texture(tex0, v_tex_coords);
                     else if(biome == 1u) f_color = (0.3 + 0.7 * lum, 1.0) * texture(tex1, v_tex_coords);

src/support/mod.rs

@@ -83,7 +83,7 @@ pub fn load_ground(display: &Display) -> VertexBufferAny {
         biome: u32,
     }
 
-    implement_vertex!(Vertex, altitude, normal, index);
+    implement_vertex!(Vertex, altitude, normal, index, biome);
 
     let mut vertex_data: Vec<Vertex> = Vec::new();