glmemorypbo: don't double read pixels
The optimistic download_transfer was not setting the required flag to not perform glReadPixels on subsequent map (READ). resulting in glReadPixels happening twice.
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@ -792,6 +792,7 @@ _download_transfer (GstGLContext * context, GstGLMemoryPBO * gl_mem)
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if (_read_pixels_to_pbo (gl_mem))
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GST_CAT_TRACE (GST_CAT_GL_MEMORY, "optimistic download of texture %u "
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"using pbo %u", gl_mem->mem.tex_id, gl_mem->pbo->id);
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GST_MEMORY_FLAG_UNSET (gl_mem, GST_GL_BASE_MEMORY_TRANSFER_NEED_DOWNLOAD);
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g_mutex_unlock (&mem->lock);
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}
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