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qt/gloverlay: reset OpenGL state after Qt drawing
Reset to the original OpenGL state as required by the GStreamer OpenGL API contract. Fixes output with a glimagesink element downstream. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/623>
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@ -555,6 +555,8 @@ void GstQuickRenderer::ensureFbo()
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void
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GstQuickRenderer::renderGstGL ()
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{
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const GstGLFuncs *gl = gl_context->gl_vtable;
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GST_TRACE ("%p current QOpenGLContext %p", this,
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QOpenGLContext::currentContext());
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m_quickWindow->resetOpenGLState();
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@ -585,6 +587,11 @@ GstQuickRenderer::renderGstGL ()
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gl_mem = (GstGLMemory *) gst_gl_base_memory_alloc (gl_allocator, gl_params);
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m_fbo = nullptr;
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m_quickWindow->resetOpenGLState ();
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/* Qt doesn't seem to reset this, breaking glimagesink */
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if (gl->DrawBuffer)
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gl->DrawBuffer (GL_BACK);
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}
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GstGLMemory *GstQuickRenderer::generateOutput(GstClockTime input_ns)
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