RESOLVED FIXED307316
[WebGL] Prevent READ_FRAMEBUFFER operations from corrupting DRAW_FRAMEBUFFER state 
https://bugs.webkit.org/show_bug.cgi?id=307316
Summary [WebGL] Prevent READ_FRAMEBUFFER operations from corrupting DRAW_FRAMEBUFFER ...
roberto_rodriguez2
Reported 2026-02-09 00:08:59 PST
rdar://169621664 Calling framebufferTexture2D() on READ_FRAMEBUFFER was unexpectedly modifying DRAW_FRAMEBUFFER state. The issue was that drawBuffersIfNecessary() unconditionally called glDrawBuffers(), which always targets DRAW_FRAMEBUFFER - so modifying one framebuffer's attachments would corrupt whatever was bound to DRAW_FRAMEBUFFER. Fix by deferring the glDrawBuffers() call: when attachments change while bound to READ_FRAMEBUFFER, record that sync is needed and perform it when the framebuffer is later bound to DRAW_FRAMEBUFFER.
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roberto_rodriguez2
Comment 1 2026-02-09 00:13:06 PST
Pull request: https://github.com/WebKit/WebKit/pull/58181
EWS
Comment 2 2026-02-10 19:12:03 PST
Committed 307223@main (45661a525863): <https://commits.webkit.org/307223@main> Reviewed commits have been landed. Closing PR #58181 and removing active labels.
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