Make output buffer large enough for all vertices

QTProject/subdivision.cpp

@@ -330,7 +330,7 @@ void Subdivision::runShader(Input input, Tables &tables) {
     GLuint output_handle;
     f->glGenBuffers(1, &output_handle);
     f->glBindBuffer(GL_SHADER_STORAGE_BUFFER, output_handle);
-    f->glBufferData(GL_SHADER_STORAGE_BUFFER, tables.edge_indices.size() * sizeof(Vertex) / 4, NULL, GL_DYNAMIC_DRAW);
+    f->glBufferData(GL_SHADER_STORAGE_BUFFER, (input.vertex_buffer.size() + tables.edge_indices.size() / 4) * sizeof(Vertex), NULL, GL_DYNAMIC_DRAW);
 
     f->glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);