NXTTest: add other Is<Backend> methods

src/tests/NXTTest.cpp

@@ -108,6 +108,18 @@ bool NXTTest::IsD3D12() const {
     return GetParam() == D3D12Backend;
 }
 
+bool NXTTest::IsMetal() const {
+    return GetParam() == MetalBackend;
+}
+
+bool NXTTest::IsOpenGL() const {
+    return GetParam() == OpenGLBackend;
+}
+
+bool NXTTest::IsVulkan() const {
+    return GetParam() == VulkanBackend;
+}
+
 void NXTTest::SetUp() {
     binding = utils::CreateBinding(ParamToBackendType(GetParam()));
     NXT_ASSERT(binding != nullptr);

src/tests/NXTTest.h

@@ -18,7 +18,7 @@
 
 // Getting data back from NXT is done in an async manners so all expectations are "deferred"
 // until the end of the test. Also expectations use a copy to a MapRead buffer to get the data
-// so resources should have the TransferDst allowed usage bit if you want to add expectations on them.
+// so resources should have the TransferSrc allowed usage bit if you want to add expectations on them.
 #define EXPECT_BUFFER_U32_EQ(expected, buffer, offset) \
     AddBufferExpectation(__FILE__, __LINE__, buffer, offset, sizeof(uint32_t), new detail::ExpectEq<uint32_t>(expected));
 
@@ -65,6 +65,9 @@ class NXTTest : public ::testing::TestWithParam<BackendType> {
         void TearDown() override;
 
         bool IsD3D12() const;
+        bool IsMetal() const;
+        bool IsOpenGL() const;
+        bool IsVulkan() const;
 
     protected:
         nxt::Device device;