OpenGL robustness reset status and verification of recovered context data

Answer

No. After any robustness reset that returns a status other than GL_NO_ERROR (including GL_UNKNOWN_CONTEXT_RESET), the OpenGL 4.5 core specification declares the entire context contents undefined. Portable code must assume a total loss of all buffers, textures, programs, and state and must recreate the context or re‑initialize everything before continuing.

Confirmed facts

• The only portable query is glGetGraphicsResetStatus; it returns GL_NO_ERROR, GL_GUILTY_CONTEXT_RESET, GL_INNOCENT_CONTEXT_RESET, or GL_UNKNOWN_CONTEXT_RESET.
• The spec explicitly states that once the status is not GL_NO_ERROR, all context state is undefined – there is no standard way to discover which resources survived.
• GL_UNKNOWN_CONTEXT_RESET is treated the same as the other reset values for portable behavior; no additional diagnostic token is defined.
• Each OpenGL context maintains its own reset status; a reset in one context does not affect the status of another context in the same process.

Steps for this case

1. After rendering or at a safe point, call glGetGraphicsResetStatus for the context you are using.
2. If the result is not GL_NO_ERROR, destroy the context (or abandon it) and create a new one.
3. Re‑initialize all GL objects (buffers, textures, shaders, framebuffers, etc.) and state before issuing further GL commands.
4. In a multi‑context application, repeat the status check for each context independently; treat each context’s reset status separately.