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author | Laszlo Agocs <laszlo.agocs@qt.io> | 2016-12-01 10:51:13 +0100 |
---|---|---|
committer | Laszlo Agocs <laszlo.agocs@qt.io> | 2016-12-01 12:38:21 +0000 |
commit | 1670bc751e7f7f3fddf92870b9a4da5f38ab93a9 (patch) | |
tree | e0e67c2848a21a24e988a05d2a18a4a30817ba47 /src/plugins | |
parent | 2503a1e9e7a33c9a69eb134ba59711078255ca4c (diff) |
eglfs: make it possible to configure the EGLStream FIFO length
Setting QT_QPA_EGLFS_STREAM_FIFO_LENGTH to a >= 1 value changes from
mailbox to FIFO mode, with the specified length.
[ChangeLog][Platform Specific Changes][Linux] Added an option to switch
from mailbox to FIFO mode in eglfs' EGLStream backend. This is done by
setting the environment variable QT_QPA_EGLFS_STREAM_FIFO_LENGTH to a
>= 1 value, the desired length of the FIFO queue.
Change-Id: Ib98e2ff805f8c00ca2e224d1db5b9c1b2c9a04f0
Done-with: Pasi Petajajarvi <pasi.petajajarvi@theqtcompany.com>
Reviewed-by: Pasi Petäjäjärvi <pasi.petajajarvi@qt.io>
Diffstat (limited to 'src/plugins')
-rw-r--r-- | src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_egldevice/qeglfskmsegldeviceintegration.cpp | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_egldevice/qeglfskmsegldeviceintegration.cpp b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_egldevice/qeglfskmsegldeviceintegration.cpp index d0c9c9565e..977b318ad9 100644 --- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_egldevice/qeglfskmsegldeviceintegration.cpp +++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_egldevice/qeglfskmsegldeviceintegration.cpp @@ -129,10 +129,16 @@ void QEglJetsonTK1Window::resetSurface() qCDebug(qLcEglfsKmsDebug, "Creating stream"); EGLDisplay display = screen()->display(); - EGLOutputLayerEXT layer = EGL_NO_OUTPUT_LAYER_EXT; - EGLint count; + EGLint streamAttribs[3]; + int streamAttribCount = 0; + int fifoLength = qEnvironmentVariableIntValue("QT_QPA_EGLFS_STREAM_FIFO_LENGTH"); + if (fifoLength > 0) { + streamAttribs[streamAttribCount++] = EGL_STREAM_FIFO_LENGTH_KHR; + streamAttribs[streamAttribCount++] = fifoLength; + } + streamAttribs[streamAttribCount++] = EGL_NONE; - m_egl_stream = m_integration->m_funcs->create_stream(display, Q_NULLPTR); + m_egl_stream = m_integration->m_funcs->create_stream(display, streamAttribs); if (m_egl_stream == EGL_NO_STREAM_KHR) { qWarning("resetSurface: Couldn't create EGLStream for native window"); return; @@ -140,6 +146,16 @@ void QEglJetsonTK1Window::resetSurface() qCDebug(qLcEglfsKmsDebug, "Created stream %p on display %p", m_egl_stream, display); + EGLint count; + if (m_integration->m_funcs->query_stream(display, m_egl_stream, EGL_STREAM_FIFO_LENGTH_KHR, &count)) { + if (count > 0) + qCDebug(qLcEglfsKmsDebug, "Using EGLStream FIFO mode with %d frames", count); + else + qCDebug(qLcEglfsKmsDebug, "Using EGLStream mailbox mode"); + } else { + qCDebug(qLcEglfsKmsDebug, "Could not query number of EGLStream FIFO frames"); + } + if (!m_integration->m_funcs->get_output_layers(display, Q_NULLPTR, Q_NULLPTR, 0, &count) || count == 0) { qWarning("No output layers found"); return; @@ -159,6 +175,7 @@ void QEglJetsonTK1Window::resetSurface() Q_ASSERT(cur_screen); qCDebug(qLcEglfsKmsDebug, "Searching for id: %d", cur_screen->output().crtc_id); + EGLOutputLayerEXT layer = EGL_NO_OUTPUT_LAYER_EXT; for (int i = 0; i < actualCount; ++i) { EGLAttrib id; if (m_integration->m_funcs->query_output_layer_attrib(display, layers[i], EGL_DRM_CRTC_EXT, &id)) { |