Prioritize discrete GPU in end2end tests

- Prefer discrete GPU on multi-GPU systems, otherwise get
integrated GPU.
- Add a test to check adapter filter.

BUG=dawn:184

Change-Id: Ib1c3e81e20a15aeaf18746892324ce5144b7fda1
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/9320
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

src/tests/DawnTest.cpp

@@ -378,22 +378,23 @@ void DawnTestBase::SetUp() {
 
         for (const dawn_native::Adapter& adapter : adapters) {
             if (adapter.GetBackendType() == backendType) {
+                if (adapter.GetDeviceType() == dawn_native::DeviceType::CPU) {
+                    continue;
+                }
+
+                // Filter adapter by vendor id
                 if (HasVendorIdFilter()) {
                     if (adapter.GetPCIInfo().vendorId == GetVendorIdFilter()) {
                         mBackendAdapter = adapter;
                         break;
                     }
-                } else {
+                    continue;
-                    mBackendAdapter = adapter;
-
-                    // On Metal, select the last adapter so that the discrete GPU is tested on
-                    // multi-GPU systems.
-                    // TODO(cwallez@chromium.org): Replace this with command line arguments
-                    // requesting a specific device / vendor ID once the macOS 10.13 SDK is rolled
-                    // and correct PCI info collection is implemented on Metal.
-                    if (backendType != dawn_native::BackendType::Metal) {
-                        break;
                 }
+
+                // Prefer discrete GPU on multi-GPU systems, otherwise get integrated GPU.
+                mBackendAdapter = adapter;
+                if (mBackendAdapter.GetDeviceType() == dawn_native::DeviceType::DiscreteGPU) {
+                    break;
                 }
             }
         }
@@ -484,6 +485,10 @@ bool DawnTestBase::EndExpectDeviceError() {
     return mError;
 }
 
+dawn_native::PCIInfo DawnTestBase::GetPCIInfo() const {
+    return mPCIInfo;
+}
+
 // static
 void DawnTestBase::OnDeviceError(DawnErrorType type, const char* message, void* userdata) {
     ASSERT(type != DAWN_ERROR_TYPE_NO_ERROR);

src/tests/DawnTest.h

@@ -175,6 +175,8 @@ class DawnTestBase {
     bool HasVendorIdFilter() const;
     uint32_t GetVendorIdFilter() const;
 
+    dawn_native::PCIInfo GetPCIInfo() const;
+
   protected:
     dawn::Device device;
     dawn::Queue queue;

src/tests/end2end/BasicTests.cpp

@@ -19,6 +19,13 @@
 class BasicTests : public DawnTest {
 };
 
+// Test adapter filter by vendor id.
+TEST_P(BasicTests, VendorIdFilter) {
+    DAWN_SKIP_TEST_IF(!HasVendorIdFilter());
+
+    ASSERT_EQ(GetPCIInfo().vendorId, GetVendorIdFilter());
+}
+
 // Test Buffer::SetSubData changes the content of the buffer, but really this is the most
 // basic test possible, and tests the test harness
 TEST_P(BasicTests, BufferSetSubData) {