Vulkan: minimize-gpu-work: Use 1x1 offscreen

When minimize-gpu-work is requested, the idea is to have GPU work reduced to minimum. Without shrink the offscreen window to 1x1, the driver load/store op may still have to load entire surface which could be costly. This CL reduces the offscreen surface size to 1x1 when --minimize-gpu-work is specified. Bug: b/184766477 Change-Id: Ic8d9d4c2fe8295a0a5808dcee35120fdd20e0f56 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2840963 Commit-Queue: Charlie Lao <cclao@google.com> Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>

Vulkan: minimize-gpu-work: Use 1x1 offscreen
a766ab14 · Charlie Lao · Commit Bot · ccc0fbaa · a766ab14
Commit a766ab14 authored Apr 20, 2021 by Charlie Lao Committed by Commit Bot Apr 28, 2021
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TracePerfTest.cpp src/tests/perf_tests/TracePerfTest.cpp +11 -2

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--- a/src/tests/perf_tests/TracePerfTest.cpp
+++ b/src/tests/perf_tests/TracePerfTest.cpp
@@ -992,8 +992,17 @@ void TracePerfTest::initializeBenchmark()
    mTraceLibrary->setBinaryDataDir(testDataDir);
-    mWindowWidth  = mTestParams.windowWidth;
+    if (gMinimizeGPUWork)
-    mWindowHeight = mTestParams.windowHeight;
+    {
+        // Shrink the offscreen window to 1x1.
+        mWindowWidth  = 1;
+        mWindowHeight = 1;
+    }
+    else
+    {
+        mWindowWidth  = mTestParams.windowWidth;
+        mWindowHeight = mTestParams.windowHeight;
+    }
    mCurrentFrame = mStartFrame;
    if (IsAndroid())