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Bug 2575 - Current GL context tracking fails
Summary: Current GL context tracking fails
Status: RESOLVED FIXED
Alias: None
Product: SDL
Classification: Unclassified
Component: video (show other bugs)
Version: 2.0.3
Hardware: x86_64 Linux
: P2 normal
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-06-07 01:48 UTC by Ronie Salgado
Modified: 2017-08-14 13:03 UTC (History)
0 users

See Also:

Attachments
Bug Reproduction (14.50 KB, application/gzip)
2014-06-07 01:48 UTC, Ronie Salgado 		Details
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Description Ronie Salgado 2014-06-07 01:48:20 UTC 
Created attachment 1673 [details]
Bug Reproduction

The GL Renderer current context tracking fails when one window is used with an SDL renderer but another separate window is used with a user handled OpenGL context.

Attached is a small program that reproduces this bug, at least in some Linux machines where an OpenGL renderer is provided by default.

Expected Output:
-"First window" should be blue.
-"Second window" should be green.

Gotten Output:
- "First window" black.
- "Second window" blue.

What happened:
The renderer created for the "first window" ends rendering into the "second window" OpenGL context.

Bug location:

SDL_render_gl.c - line 286 on hg:
static SDL_GLContext SDL_CurrentContext = NULL;

When making SDL_GL_MakeCurrent from the user perspective, that variable or the GL renderer is not notified about the OpenGL context change.

Solution proposal:
- Move the current GL context cache into another place global.
Comment 1 Sam Lantinga 2014-06-16 01:10:19 UTC 
I think this change fixes the bug, can you verify?
https://hg.libsdl.org/SDL/rev/553e9f7cd10e

Thanks!
Comment 2 Sam Lantinga 2017-08-14 13:03:02 UTC 
No response, closing this bug.