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Bug 2740 - RenderReadPixels / UpdateTexture upside-down
Summary: RenderReadPixels / UpdateTexture upside-down
Status: RESOLVED FIXED
Alias: None
Product: SDL
Classification: Unclassified
Component: render (show other bugs)
Version: 2.0.3
Hardware: x86_64 Linux
: P2 normal
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords: target-2.0.6
Depends on:
Blocks:
 
Reported: 2014-09-24 17:04 UTC by sanette
Modified: 2017-10-21 17:11 UTC (History)
1 user (show)

See Also:

Attachments
pixels upside-down (1.34 KB, patch)
2014-09-25 06:53 UTC, sanette 		Details | Diff
View All Add an attachment (proposed patch, testcase, etc.)

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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!