void OverlayRendererInternals::Initialize()
{
// Perform any initialization after graphics capabilities have been detected. Notably,
// only at this point can we safely allocate VBOs (in contrast to e.g. in the constructor),
// because their creation depends on the shader path, which is not reliably set before this point.
quadVertices.SetNumVertices(MAX_QUAD_OVERLAYS * 4);
quadVertices.Layout(); // allocate backing store
quadIndices.SetNumVertices(MAX_QUAD_OVERLAYS * 6);
quadIndices.Layout(); // allocate backing store
// Since the quads in the vertex array are independent and always consist of exactly 4 vertices per quad, the
// indices are always the same; we can therefore fill in all the indices once and pretty much forget about
// them. We then also no longer need its backing store, since we never change any indices afterwards.
VertexArrayIterator<u16> index = quadIndices.GetIterator();
for (size_t i = 0; i < MAX_QUAD_OVERLAYS; ++i)
{
*index++ = i*4 + 0;
*index++ = i*4 + 1;
*index++ = i*4 + 2;
*index++ = i*4 + 2;
*index++ = i*4 + 3;
*index++ = i*4 + 0;
}
quadIndices.Upload();
quadIndices.FreeBackingStore();
}
