SpriteBatch vs. per‑sprite draw calls for animated tiles under a 100‑draw‑call limit

Answer

Use a single love.graphics.SpriteBatch with the stream usage hint. It keeps the draw‑call count at 1, well below the 100‑call budget, and the per‑frame CPU cost of updating the batch for 500 sprites is modest compared to 500 separate love.graphics.draw calls that would exceed the limit.

Why this works

• One batch = one draw call, regardless of sprite count.
• Updating a batch with :setBuffer or :add is linear in the number of sprites; 500 sprites use 2000 vertices, far below the typical 65535 vertex limit.
• The stream hint tells the GPU that the buffer will change each frame, avoiding costly reallocations.
• If all tiles share the same texture (or are packed in an atlas), no extra batches are needed.
• Different textures require either multiple batches or a combined atlas; otherwise the draw‑call savings disappear.

Practical Steps for LÖVE2D

1. Create a batch once:

   local batch = love.graphics.newSpriteBatch(texture, 500, "stream")
   

2. Each frame, clear the batch and add sprite positions:

   batch:clear()
   for i=1,500 do
       local x, y = getSpritePosition(i) -- your own logic
       batch:add(x, y)
   end
   

3. Draw the batch once per frame:

   love.graphics.draw(batch)
   

4. Use a texture atlas if the sprites use different images:

   local atlas = love.graphics.newImage("atlas.png")
   -- each sprite uses a quad from the atlas
   batch:add(x, y, 0, 1, 1, quad)
   

5. Verify the draw‑call budget:

   print(love.graphics.getStats().drawcalls) -- should output 1
   

When Per‑Sprite Calls Might Be Acceptable

• If the sprites are static or move very infrequently, you can build the batch once and only update when necessary.
• If you need to change the texture of individual sprites each frame, consider multiple batches or a dynamic atlas.

Missing Diagnostic Detail

Do all 500 sprites share the same texture (or are they already packed into a single atlas)? If not, you’ll need additional batches or an atlas to keep the draw‑call count low.