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Bug 1537

Summary: SDL_RenderCopy rendering issue
Product: SDL Reporter: Jacek Dudek <jacek>
Component: videoAssignee: Gabriel Jacobo <gabomdq>
Status: RESOLVED WORKSFORME QA Contact: Sam Lantinga <slouken>
Severity: blocker    
Priority: P1 CC: icculus
Version: HG 2.0Keywords: target-2.0.0
Hardware: x86   
OS: Windows 7   
Attachments: Project with different versions of SDL libraries.

Description Jacek Dudek 2012-07-05 04:53:21 UTC 
Created attachment 897 [details]
Project with different versions of SDL libraries.

problem discussed <a href="http://forums.libsdl.org/viewtopic.php?p=33217&sid=ecd1702bc6015a5b07d40dc54c254a89">here</a> 

Bug occured while using streaming acess to texture and "by hand" replacing pixels. 

Attached project works fine for commit 6319 but not for any later version.
Comment 1 Sam Lantinga 2013-05-22 01:08:43 UTC 
Gabriel, can you look at this for the SDL 2.0 release?

Thanks!
Comment 2 Gabriel Jacobo 2013-05-22 12:49:59 UTC 
I don't have access to a Windows system with Visual Studio to figure this one out. 

Looking back on the thread, I now understand that there was no regression in SDL_RenderCopy (if I understand correctly), but the problem was that SDL_RenderCopyEX didn't produce the desired output (all black).

Given that creating a texture from a surface works, I think there could be a problem with the alpha channel, or the blend mode (it is not set in the example AFAICT). A simple test case would be useful to confirm this, but I'm fairly confident the problem doesn't lie with SDL.
Comment 3 Ryan C. Gordon 2013-07-12 18:52:55 UTC 
(Sorry if you get a lot of copies of this email, we're touching dozens of bug reports right now.)

Tagging a bunch of bugs as target-2.0.0, Priority 1.

This means we're in the final stretch for an official SDL 2.0.0 release! These are the bugs we really want to fix before shipping if humanly possible.

That being said, we don't promise to fix them because of this tag, we just want to make sure we don't forget to deal with them before we bless a final 2.0.0 release, and generally be organized about what we're aiming to ship.

Hopefully you'll hear more about this bug soon. If you have more information (including "this got fixed at some point, nevermind"), we would love to have you come add more information to the bug report when you have a moment.

Thanks!
--ryan.
Comment 4 Ryan C. Gordon 2013-08-01 22:42:35 UTC 
Just tried the attached project on Windows...works fine with both the "broken" version of the library and the non-broken one. Maybe it's an uninitialized variable in the application somewhere? Questionable that this worked on Windows up to an SDL revision that only makes a change in the X11 test in the configure script...that sounds like an app bug to me.

I'm closing this one. If someone can demonstrate it's still a problem, please reopen this bug.

--ryan.