static void CollectRenderables()
{
renderables.Clear();
renderablePositions.Clear();
Box cameraWorldBox = new Box(camera.position, cameraHalfSize);
for (int i = 0; i < Systems.renderables.renderables.count; i++)
{
// @NOTE: assuming everything renderable has a position, so why not just group them together dummy
// @TODO: need to resolve two things in the same spot
if (cameraWorldBox.PointInBox(Systems.positions.positions[i]))
{
renderables.PushBack(Systems.renderables.renderables[i]);
renderablePositions.PushBack(Systems.positions.positions[i]);
}
}
// @PERF: this is VERY BAD. If we're rendering 100 entities we do this potentialy 100^2 times!!!
// What are some ways we could make it better?
// @TODO: sort the renderables!
Vector2 currPosition = new Vector2(cameraWorldBox.min.x, cameraWorldBox.min.y);
int r = 0;
while (r < renderableEntities)
{
bool foundRenderableAtPosition = false;
for (int i = 0; i < renderables.count; i++)
{
// @PERF: because multiple things could be at the same position we have to check EVERYTHING
// to make sure we pick the thing with the topmost layer, which is very unfortunate
if (currPosition.Equals(renderablePositions[i]))
{
if (foundRenderableAtPosition)
{
if (renderablesSorted[r].layer < renderables[i].layer)
{
renderablesSorted[r] = renderables[i];
renderablePositionsSorted[r] = renderablePositions[i];
}
}
else
{
renderablePositionsSorted[r] = renderablePositions[i];
renderablesSorted[r] = renderables[i];
foundRenderableAtPosition = true;
}
}
}
if (foundRenderableAtPosition)
{
r++;
currPosition.x++;
if (currPosition.x > cameraWorldBox.max.x)
{
currPosition.x = cameraWorldBox.min.x;
currPosition.y++;
}
}
}
}
