Disclosure: This draft was generated with AI and checked against the cited primary sources, with a separate AI editorial review. It was prepared for the FrameSprite team, which has a commercial interest in FrameSprite. Proposed examples are not executed tests unless explicitly identified as recorded fixture results.
SDL_DestroyRenderer frees its associated textures. A cache holding their old pointers becomes invalid when the renderer is destroyed, even if the source PNG files and gameplay objects still exist. Invalidate those references and rebuild resources for the new renderer. This ownership rule is stated by SDL_DestroyRenderer.
Key Takeaways
- A texture cache belongs to a renderer lifetime, not just to an asset filename.
- Do not destroy an already-freed texture through a stale cached pointer.
- Separate persistent asset descriptions from transient renderer resources.
Find the renderer transition
Trace every path that creates or destroys the renderer: window recreation, graphics-setting changes, recovery code and application shutdown. Log a renderer-generation number with each texture cache entry.
A filename-only key such as hero.png is insufficient to prove that its cached pointer belongs to the current renderer. The same filename can be decoded again and uploaded into a new rendering context while the old resource is gone.
Keep the asset's frame metadata, source path and animation description independent of that pointer. The animation handoff checklist describes the persistent contract that can survive a renderer transition.
Choose one destruction owner
One valid shutdown order is to destroy tracked textures, clear their entries, destroy the renderer and then destroy its window. Another path may let renderer destruction release textures, but must then invalidate all references without trying to free them again.
Do not mix those ownership policies. The SDL_DestroyTexture reference explains explicit texture destruction; the renderer's broader cleanup means that call must not later receive a dangling pointer.
A conceptual cache record can separate the identities:
asset: characters/hero.png
renderer_generation: 7
texture: pointer valid only for generation 7
frame_metadata: retained independently of the GPU pointer
This is a proposed application data contract, not SDL syntax or an executed cache implementation. It makes a stale generation detectable before drawing.
Rebuild and publish a complete resource set
Create replacement textures for the new renderer before making the actor visible. Check every creation result, including equipment and shadow textures. The SDL_CreateTextureFromSurface documentation provides one upload path from retained CPU data.
Do not restore the body pointer while leaving the weapon pointer from the previous renderer. A partially rebuilt character can otherwise look like a transparency or draw-order bug.
| Persistent information | Renderer-specific resource |
|---|---|
| Source file path | SDL_Texture pointer |
| Frame rectangles | Uploaded texture |
| Animation names and timing | Renderer-associated render targets |
| Intended equipment offsets | Current GPU resource handles |
The atomic bundle replacement guide covers publishing a complete asset set. Here the trigger is renderer lifetime rather than a new art revision.
Acceptance after repeated recreation
Recreate the renderer several times while using a character with multiple textures. Confirm each resource is rebuilt once for the new generation and that no old pointer reaches a rendering or destruction call.
Test a deliberately failing upload. Keep a clear unavailable state or a valid fallback associated with the new renderer instead of reviving an old resource. For CPU/GPU storage budgeting, see the texture-memory guide.
This article targets SDL 3.2+ and the documented renderer ownership model. No recovery loop, leak measurement or renderer recreation was executed; the application must verify its own transition and failure paths.
Check delayed consumers before teardown
A thumbnail job, queued draw list or export callback can retain a texture pointer after the actor cache has been cleared. Include those consumers in the renderer-generation policy and stop or invalidate their work before destroying the renderer. A non-null pointer is not evidence that its associated renderer still exists. Keep asynchronous tasks on CPU-owned source data where that matches their job, and create GPU resources through the current renderer owner. This is an application ownership recommendation, not an additional automatic guarantee supplied by SDL.
Sources and editorial ownership
Primary references checked on October 20, 2026:
Editorial owner: FrameSprite Workflow Team. Editorial and verification policy. Report a documentation correction.
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