From f567129bb514b5856c7d1320cdc4dd5a84a5b6e3 Mon Sep 17 00:00:00 2001
From: Laszlo Agocs <laszlo.agocs@qt.io>
Date: Sat, 7 Sep 2019 19:23:09 +0200
Subject: rhi: d3d11: Add the device lost testing machinery
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The device can be lost when physically removing the graphics adapter,
disabling the driver (Device Manager), upgrading/uninstalling the
graphics driver, and when it is reset due to an error.

Some of these can (and should) be tested manually, but the last
one has a convenient, programmatic way of triggering: by triggering
the timeout detection and recovery (TDR) of WDDM. A compute shader
with an infinite loop should trigger this after 2 seconds by default.

All tests in tests/manual/rhi can now be started with a --curse <count>
argument where <count> specifies the number of frames to render before
breaking the device. Qt Quick will get an environment variable with
similar semantics in a separate patch.

Change-Id: I4b6f8d977a15b5b89d686b3973965df6435810ae
Reviewed-by: Christian Strømme <christian.stromme@qt.io>
---
 tests/manual/rhi/shared/examplefw.h | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'tests/manual/rhi/shared')

diff --git a/tests/manual/rhi/shared/examplefw.h b/tests/manual/rhi/shared/examplefw.h
index 1a29ef5f7e..8afacc074a 100644
--- a/tests/manual/rhi/shared/examplefw.h
+++ b/tests/manual/rhi/shared/examplefw.h
@@ -126,6 +126,7 @@ int sampleCount = 1;
 QRhiSwapChain::Flags scFlags = 0;
 QRhi::BeginFrameFlags beginFrameFlags = 0;
 QRhi::EndFrameFlags endFrameFlags = 0;
+int framesUntilTdr = -1;
 
 class Window : public QWindow
 {
@@ -278,6 +279,10 @@ void Window::init()
     if (graphicsApi == D3D11) {
         QRhiD3D11InitParams params;
         params.enableDebugLayer = true;
+        if (framesUntilTdr > 0) {
+            params.framesUntilKillingDeviceViaTdr = framesUntilTdr;
+            params.repeatDeviceKill = true;
+        }
         m_r = QRhi::create(QRhi::D3D11, &params, rhiFlags);
     }
 #endif
@@ -461,8 +466,13 @@ int main(int argc, char **argv)
     // Testing cleanup both with QWindow::close() (hitting X or Alt-F4) and
     // QCoreApplication::quit() (e.g. what a menu widget would do) is important.
     // Use this parameter for the latter.
-    QCommandLineOption sdOption({ "s", "self-destruct" }, QLatin1String("Self destruct after 5 seconds"));
+    QCommandLineOption sdOption({ "s", "self-destruct" }, QLatin1String("Self-destruct after 5 seconds."));
     cmdLineParser.addOption(sdOption);
+    // Attempt testing device lost situations on D3D at least.
+    QCommandLineOption tdrOption(QLatin1String("curse"), QLatin1String("Curse the graphics device. "
+                                                        "(generate a device reset every <count> frames when on D3D11)"),
+                                 QLatin1String("count"));
+    cmdLineParser.addOption(tdrOption);
 
     cmdLineParser.process(app);
     if (cmdLineParser.isSet(nullOption))
@@ -521,6 +531,9 @@ int main(int argc, char **argv)
     }
 #endif
 
+    if (cmdLineParser.isSet(tdrOption))
+        framesUntilTdr = cmdLineParser.value(tdrOption).toInt();
+
     // Create and show the window.
     Window w;
 #if QT_CONFIG(vulkan)
-- 
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