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Bug 2740

Summary: RenderReadPixels / UpdateTexture upside-down
Product: SDL Reporter: sanette <sanette-linux>
Component: renderAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: sylvain.becker
Version: 2.0.3Keywords: target-2.0.6
Hardware: x86_64   
OS: Linux   
Attachments: pixels upside-down

Description sanette 2014-09-24 17:04:54 UTC 
If I RenderReadPixels
and then immediately use the pixel data in UpdateTexture,
then the image is upside-down
Comment 1 sanette 2014-09-24 17:05:25 UTC 
I'm using the opengl renderer
Comment 2 sanette 2014-09-25 06:53:42 UTC 
Created attachment 1881 [details]
pixels upside-down
Comment 3 sanette 2014-09-25 06:54:24 UTC 
of course, if I remove the specific code to put pixels top-down
in src/render/opengl/SDL_render_gl.c (see patch) then this works...
but this is very strange.
Comment 4 sanette 2014-09-26 14:16:46 UTC 
the upside-down behaviour was noticed already in Bug 2705
Comment 5 Ryan C. Gordon 2015-02-19 06:32:16 UTC 
Marking a large number of bugs with the "triage-2.0.4" keyword at once. Sorry
if you got a lot of email from this. This is to help me sort through some bugs
in regards to a 2.0.4 release. We may or may not fix this bug for 2.0.4,
though!
Comment 6 Sam Lantinga 2017-08-14 05:01:27 UTC 
Ryan, can you make sure we're reading the pixels the right way for 2.0.6?
Comment 7 Sylvain 2017-10-21 12:58:40 UTC 
I tried various configuration (with and without RenderTarget, renderer opengl) and I believe this is fixed.

Very likely with: https://hg.libsdl.org/SDL/rev/b8ca95a8eea9
Comment 8 Sam Lantinga 2017-10-21 17:11:17 UTC 
Okay, can you please reopen this if you're still seeing the problem?

Thanks!