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eglfs: make it possible to configure the EGLStream FIFO length

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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>
This commit is contained in:
Laszlo Agocs 2016-12-01 10:51:13 +01:00
parent 2503a1e9e7
commit 1670bc751e
1 changed files with 20 additions and 3 deletions
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23
src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_egldevice/qeglfskmsegldeviceintegration.cpp
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@ -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)) {