Finish vertex compute shader

QTProject/subdivision-vertex.compute

@@ -29,7 +29,6 @@ layout(std430, binding=3) writeonly buffer Output {
 void main(){
     unsigned int size = offsets[gl_GlobalInvocationID.x + 1] - offsets[gl_GlobalInvocationID.x];
 
-    new_vertices[gl_GlobalInvocationID.x].norm = vec3(0.0f, 0.0f, 0.0f);
     new_vertices[gl_GlobalInvocationID.x].uv = vec2(0.0f, 0.0f);
 
     // FIXME: size or size - 1?
@@ -37,9 +36,12 @@ void main(){
     float alpha = 5.0f/8.0f - t * t;
 
     vec3 pos = vec3(0.0f, 0.0f, 0.0f);
+    vec3 norm = vec3(0.0f, 0.0f, 0.0f);
     for (unsigned int i = 1; i < size; i++) {
         pos += vertices[indices[offsets[gl_GlobalInvocationID.x] + i]].pos;
+        norm += vertices[indices[offsets[gl_GlobalInvocationID.x] + i]].norm;
     }
 
-    new_vertices[gl_GlobalInvocationID.x].pos = (1.0f - alpha) * vertices[indices[offsets[gl_GlobalInvocationID.x]]].pos + alpha / (float(size) - 1) * pos;
+    new_vertices[gl_GlobalInvocationID.x].pos = (1.0f - alpha) * vertices[indices[offsets[gl_GlobalInvocationID.x]]].pos + alpha / (float(size) - 1.0f) * pos;
+    new_vertices[gl_GlobalInvocationID.x].norm = normalize((1.0f - alpha) * vertices[indices[offsets[gl_GlobalInvocationID.x]]].norm + alpha / (float(size) - 1.0f) * norm);
 }