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Bug 4402

Summary: Window not updated after first frame
Product: SDL Reporter: Michel Rouzic <contact>
Component: videoAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: major    
Priority: P2 CC: contact
Version: HG 2.0   
Hardware: x86_64   
OS: Windows 10   
Attachments: Program with source that reproduces the problem described depending on the DLL

Description Michel Rouzic 2018-11-29 18:06:32 UTC 
Created attachment 3512 [details]
Program with source that reproduces the problem described depending on the DLL

Another day another bug, but this time I didn't come empty-handed. Since these two November 1st commits by Ryan C. Gordon:
https://hg.libsdl.org/SDL/rev/dc9108cd43403628a5f747b8ce18443c5459ff93
https://hg.libsdl.org/SDL/rev/03d0bddca61b8a6bcbbc7c7f1382dfa97756a7a4

my program's display fails to update after the first frame. The good news is that I was able to produce a test program with a very simple and beautiful code that reproduces the problem, with DLLs included that either work (those from before those commits) or don't. If I enlarge the window (not included in the test program, I wanted to keep it to the point) then SDL_LockTexture() returns a bogus pointer that can't be written to.

I marked it as major because well for me it's pretty major, I can't ship my program any version of SDL made after November 1st. I've only checked on Windows 10, it's probably a Windows-only thing. Please read instructions.txt to test it with different DLLs.
Comment 1 Ryan C. Gordon 2018-12-03 06:59:11 UTC 
This is now fixed in https://hg.libsdl.org/SDL/rev/3da9ecf40a13, thanks!

--ryan.
Comment 2 Michel Rouzic 2018-12-03 10:24:18 UTC 
Thank you, that mostly solves it, however now when resizing the window in any direction the window turns permanently white. I updated my code to handle resizing properly but then I realised that the bug appears regardless, so the test program you have should give you that issue with the latest DLL.
Comment 3 Ryan C. Gordon 2018-12-03 14:27:17 UTC 
(In reply to Michel Rouzic from comment #2)
> Thank you, that mostly solves it, however now when resizing the window in
> any direction the window turns permanently white. I updated my code to
> handle resizing properly but then I realised that the bug appears
> regardless, so the test program you have should give you that issue with the
> latest DLL.

This bug is fixed now, too: https://hg.libsdl.org/SDL/rev/f167f874ae55

Sorry about that!

--ryan.