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Don't call QGLContext::doneCurrent() in MythRenderOpenGL.

- it should be unnecessary given that makeCurrent always checks the
correct context is current to the current thread and following the
threading changes, all of our OpenGL usage should be in the same thread.
- it breaks playback on certain Windows builds.
- it has a sizeable performance impact on at least one system tested
(Intel GPU)

Based on a patch from Lawrence Rust.

git-svn-id: 7dbf422c-18fa-0310-86e9-fd20926502f2
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commit 262966d31be2d60fe0657d7d4bdb082a48d74f47 1 parent 0e26821
Mark Kendall authored
Showing with 4 additions and 2 deletions.
  1. +4 −2 mythtv/libs/libmythui/mythrender_opengl.cpp
6 mythtv/libs/libmythui/mythrender_opengl.cpp
@@ -179,9 +179,11 @@ void MythRenderOpenGL::makeCurrent()
void MythRenderOpenGL::doneCurrent()
+ // we don't explicitly call QGlContext::doneCurrent() as it should be
+ // unnecessary (makeCurrent() will switch contexts as necessary), it
+ // appears to cause performance issues and breaks rendering in certain
+ // situations
- if (m_lock_level == 0)
- QGLContext::doneCurrent();
if (m_lock_level < 0)
VERBOSE(VB_IMPORTANT, LOC_ERR + "Mis-matched calls to makeCurrent()");
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