src/tests/end2end/SwapChainValidationTests.cpp - dawn - Git at Google

 // Copyright 2020 The Dawn Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 #include "tests/DawnTest.h"

 #include "common/Constants.h"
 #include "common/Log.h"
 #include "utils/ComboRenderPipelineDescriptor.h"
 #include "utils/GLFWUtils.h"
 #include "utils/WGPUHelpers.h"

 #include "GLFW/glfw3.h"

 class SwapChainValidationTests : public DawnTest {
   public:
     void SetUp() override {
         DawnTest::SetUp();
         DAWN_TEST_UNSUPPORTED_IF(UsesWire());
         DAWN_TEST_UNSUPPORTED_IF(HasToggleEnabled("skip_validation"));

         glfwSetErrorCallback([](int code, const char* message) {
             dawn::ErrorLog() << "GLFW error " << code << " " << message;
         });
         DAWN_TEST_UNSUPPORTED_IF(!glfwInit());

         // The SwapChainValidationTests don't create devices so we don't need to call
         // SetupGLFWWindowHintsForBackend. Set GLFW_NO_API anyway to avoid GLFW bringing up a GL
         // context that we won't use.
         ASSERT_TRUE(!IsOpenGL());
         glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
         window = glfwCreateWindow(400, 400, "SwapChainValidationTests window", nullptr, nullptr);

         surface = utils::CreateSurfaceForWindow(GetInstance(), window);
         ASSERT_NE(surface, nullptr);

         goodDescriptor.width = 1;
         goodDescriptor.height = 1;
         goodDescriptor.usage = wgpu::TextureUsage::RenderAttachment;
         goodDescriptor.format = wgpu::TextureFormat::BGRA8Unorm;
         goodDescriptor.presentMode = wgpu::PresentMode::Mailbox;

         badDescriptor = goodDescriptor;
         badDescriptor.width = 0;
     }

     void TearDown() override {
         // Destroy the surface before the window as required by webgpu-native.
         surface = wgpu::Surface();
         if (window != nullptr) {
             glfwDestroyWindow(window);
         }
         DawnTest::TearDown();
     }

   protected:
     GLFWwindow* window = nullptr;
     wgpu::Surface surface;
     wgpu::SwapChainDescriptor goodDescriptor;
     wgpu::SwapChainDescriptor badDescriptor;

     // Checks that a RenderAttachment view is an error by trying to create a render pass on it.
     void CheckTextureViewIsError(wgpu::TextureView view) {
         CheckTextureView(view, true, false);
     }

     // Checks that a RenderAttachment view is an error by trying to submit a render pass on it.
     void CheckTextureViewIsDestroyed(wgpu::TextureView view) {
         CheckTextureView(view, false, true);
     }

     // Checks that a RenderAttachment view is valid by submitting a render pass on it.
     void CheckTextureViewIsValid(wgpu::TextureView view) {
         CheckTextureView(view, false, false);
     }

   private:
     void CheckTextureView(wgpu::TextureView view, bool errorAtFinish, bool errorAtSubmit) {
         utils::ComboRenderPassDescriptor renderPassDesc({view});

         wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
         wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPassDesc);
         pass.EndPass();

         if (errorAtFinish) {
             ASSERT_DEVICE_ERROR(encoder.Finish());
         } else {
             wgpu::CommandBuffer commands = encoder.Finish();

             if (errorAtSubmit) {
                 ASSERT_DEVICE_ERROR(queue.Submit(1, &commands));
             } else {
                 queue.Submit(1, &commands);
             }
         }
     }
 };

 // Control case for a successful swapchain creation and presenting.
 TEST_P(SwapChainValidationTests, CreationSuccess) {
     wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);
     wgpu::TextureView view = swapchain.GetCurrentTextureView();
     swapchain.Present();
 }

 // Checks that the creation size must be a valid 2D texture size.
 TEST_P(SwapChainValidationTests, InvalidCreationSize) {
     // A width of 0 is invalid.
     {
         wgpu::SwapChainDescriptor desc = goodDescriptor;
         desc.width = 0;
         ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
     }
     // A height of 0 is invalid.
     {
         wgpu::SwapChainDescriptor desc = goodDescriptor;
         desc.height = 0;
         ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
     }

     // A width of kMaxTextureDimension2D is valid but kMaxTextureDimension2D + 1 isn't.
     {
         wgpu::SwapChainDescriptor desc = goodDescriptor;
         desc.width = kMaxTextureDimension2D;
         device.CreateSwapChain(surface, &desc);

         desc.width = kMaxTextureDimension2D + 1;
         ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
     }

     // A height of kMaxTextureDimension2D is valid but kMaxTextureDimension2D + 1 isn't.
     {
         wgpu::SwapChainDescriptor desc = goodDescriptor;
         desc.height = kMaxTextureDimension2D;
         device.CreateSwapChain(surface, &desc);

         desc.height = kMaxTextureDimension2D + 1;
         ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
     }
 }

 // Checks that the creation usage must be RenderAttachment
 TEST_P(SwapChainValidationTests, InvalidCreationUsage) {
     wgpu::SwapChainDescriptor desc = goodDescriptor;
     desc.usage = wgpu::TextureUsage::TextureBinding;
     ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
 }

 // Checks that the creation format must (currently) be BGRA8Unorm
 TEST_P(SwapChainValidationTests, InvalidCreationFormat) {
     wgpu::SwapChainDescriptor desc = goodDescriptor;
     desc.format = wgpu::TextureFormat::RGBA8Unorm;
     ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
 }

 // Checks that the implementation must be zero.
 TEST_P(SwapChainValidationTests, InvalidWithImplementation) {
     wgpu::SwapChainDescriptor desc = goodDescriptor;
     desc.implementation = 1;
     ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
 }

 // Check swapchain operations with an error swapchain are errors
 TEST_P(SwapChainValidationTests, OperationsOnErrorSwapChain) {
     wgpu::SwapChain swapchain;
     ASSERT_DEVICE_ERROR(swapchain = device.CreateSwapChain(surface, &badDescriptor));

     wgpu::TextureView view;
     ASSERT_DEVICE_ERROR(view = swapchain.GetCurrentTextureView());
     CheckTextureViewIsError(view);

     ASSERT_DEVICE_ERROR(swapchain.Present());
 }

 // Check it is invalid to call present without getting a current view.
 TEST_P(SwapChainValidationTests, PresentWithoutCurrentView) {
     wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);

     // Check it is invalid if we never called GetCurrentTextureView
     ASSERT_DEVICE_ERROR(swapchain.Present());

     // Check it is invalid if we never called since the last present.
     swapchain.GetCurrentTextureView();
     swapchain.Present();
     ASSERT_DEVICE_ERROR(swapchain.Present());
 }

 // Check that the current view isn't destroyed when the ref to the swapchain is lost because the
 // swapchain is kept alive by the surface. Also check after we lose all refs to the surface, the
 // texture is destroyed.
 TEST_P(SwapChainValidationTests, ViewValidAfterSwapChainRefLost) {
     wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);
     wgpu::TextureView view = swapchain.GetCurrentTextureView();

     swapchain = nullptr;
     CheckTextureViewIsValid(view);

     surface = nullptr;
     CheckTextureViewIsDestroyed(view);
 }

 // Check that the current view is the destroyed state after present.
 TEST_P(SwapChainValidationTests, ViewDestroyedAfterPresent) {
     wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);
     wgpu::TextureView view = swapchain.GetCurrentTextureView();
     swapchain.Present();

     CheckTextureViewIsDestroyed(view);
 }

 // Check that returned view is of the current format / usage / dimension / size / sample count
 TEST_P(SwapChainValidationTests, ReturnedViewCharacteristics) {
     utils::ComboRenderPipelineDescriptor pipelineDesc;
     pipelineDesc.vertex.module = utils::CreateShaderModule(device, R"(
         [[stage(vertex)]] fn main() -> [[builtin(position)]] vec4<f32> {
             return vec4<f32>(0.0, 0.0, 0.0, 1.0);
         })");
     pipelineDesc.cFragment.module = utils::CreateShaderModule(device, R"(
         struct FragmentOut {
             [[location(0)]] target0 : vec4<f32>;
             [[location(1)]] target1 : f32;
         };
         [[stage(fragment)]] fn main() -> FragmentOut {
             var out : FragmentOut;
             out.target0 = vec4<f32>(0.0, 1.0, 0.0, 1.0);
             out.target1 = 0.5;
             return out;
         })");
     // Validation will check that the sample count of the view matches this format.
     pipelineDesc.multisample.count = 1;
     pipelineDesc.cFragment.targetCount = 2;
     // Validation will check that the format of the view matches this format.
     pipelineDesc.cTargets[0].format = wgpu::TextureFormat::BGRA8Unorm;
     pipelineDesc.cTargets[1].format = wgpu::TextureFormat::R8Unorm;
     device.CreateRenderPipeline(&pipelineDesc);

     // Create a second texture to be used as render pass attachment. Validation will check that the
     // size of the view matches the size of this texture.
     wgpu::TextureDescriptor textureDesc;
     textureDesc.usage = wgpu::TextureUsage::RenderAttachment;
     textureDesc.dimension = wgpu::TextureDimension::e2D;
     textureDesc.size = {1, 1, 1};
     textureDesc.format = wgpu::TextureFormat::R8Unorm;
     textureDesc.sampleCount = 1;
     wgpu::Texture secondTexture = device.CreateTexture(&textureDesc);

     // Get the swapchain view and try to use it in the render pass to trigger all the validation.
     wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);
     wgpu::TextureView view = swapchain.GetCurrentTextureView();

     // Validation will also check the dimension of the view is 2D, and it's usage contains
     // RenderAttachment
     utils::ComboRenderPassDescriptor renderPassDesc({view, secondTexture.CreateView()});
     wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
     wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPassDesc);
     pass.EndPass();
     wgpu::CommandBuffer commands = encoder.Finish();

     queue.Submit(1, &commands);

     // Check that view doesn't have extra formats like Sampled.
     // TODO(cwallez@chromium.org): also check for [Readonly]Storage once that's implemented.
     wgpu::BindGroupLayout bgl = utils::MakeBindGroupLayout(
         device, {{0, wgpu::ShaderStage::Fragment, wgpu::TextureSampleType::Float}});
     ASSERT_DEVICE_ERROR(utils::MakeBindGroup(device, bgl, {{0, view}}));
 }

 // Check that failing to create a new swapchain doesn't replace the previous one.
 TEST_P(SwapChainValidationTests, ErrorSwapChainDoesntReplacePreviousOne) {
     wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);
     ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &badDescriptor));

     wgpu::TextureView view = swapchain.GetCurrentTextureView();
     swapchain.Present();
 }

 // Check that after replacement, all swapchain operations are errors and the view is destroyed.
 TEST_P(SwapChainValidationTests, ReplacedSwapChainIsInvalid) {
     {
         wgpu::SwapChain replacedSwapChain = device.CreateSwapChain(surface, &goodDescriptor);
         device.CreateSwapChain(surface, &goodDescriptor);
         ASSERT_DEVICE_ERROR(replacedSwapChain.GetCurrentTextureView());
     }

     {
         wgpu::SwapChain replacedSwapChain = device.CreateSwapChain(surface, &goodDescriptor);
         wgpu::TextureView view = replacedSwapChain.GetCurrentTextureView();
         device.CreateSwapChain(surface, &goodDescriptor);

         CheckTextureViewIsDestroyed(view);
         ASSERT_DEVICE_ERROR(replacedSwapChain.Present());
     }
 }

 // Check that after surface destruction, all swapchain operations are errors and the view is
 // destroyed. The test is split in two to reset the wgpu::Surface in the middle.
 TEST_P(SwapChainValidationTests, SwapChainIsInvalidAfterSurfaceDestruction_GetView) {
     wgpu::SwapChain replacedSwapChain = device.CreateSwapChain(surface, &goodDescriptor);
     surface = nullptr;
     ASSERT_DEVICE_ERROR(replacedSwapChain.GetCurrentTextureView());
 }
 TEST_P(SwapChainValidationTests, SwapChainIsInvalidAfterSurfaceDestruction_AfterGetView) {
     wgpu::SwapChain replacedSwapChain = device.CreateSwapChain(surface, &goodDescriptor);
     wgpu::TextureView view = replacedSwapChain.GetCurrentTextureView();
     surface = nullptr;

     CheckTextureViewIsDestroyed(view);
     ASSERT_DEVICE_ERROR(replacedSwapChain.Present());
 }

 // Test that after Device is Lost, all swap chain operations fail
 static void ToMockDeviceLostCallback(const char* message, void* userdata) {
     DawnTest* self = static_cast<DawnTest*>(userdata);
     self->StartExpectDeviceError();
 }

 // Test that new swap chain present fails after device is lost
 TEST_P(SwapChainValidationTests, NewSwapChainPresentFailsAfterDeviceLost) {
     device.SetDeviceLostCallback(ToMockDeviceLostCallback, this);
     wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);
     wgpu::TextureView view = swapchain.GetCurrentTextureView();

     device.LoseForTesting();
     ASSERT_DEVICE_ERROR(swapchain.Present());
 }

 // Test that new swap chain get current texture view fails after device is lost
 TEST_P(SwapChainValidationTests, NewSwapChainGetCurrentTextureViewFailsAfterDevLost) {
     device.SetDeviceLostCallback(ToMockDeviceLostCallback, this);
     wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);

     device.LoseForTesting();
     ASSERT_DEVICE_ERROR(swapchain.GetCurrentTextureView());
 }

 // Test that creation of a new swapchain fails after device is lost
 TEST_P(SwapChainValidationTests, CreateNewSwapChainFailsAfterDevLost) {
     device.SetDeviceLostCallback(ToMockDeviceLostCallback, this);
     device.LoseForTesting();

     ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &goodDescriptor));
 }

 DAWN_INSTANTIATE_TEST(SwapChainValidationTests, MetalBackend(), NullBackend());
	// Copyright 2020 The Dawn Authors
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	#include "tests/DawnTest.h"

	#include "common/Constants.h"
	#include "common/Log.h"
	#include "utils/ComboRenderPipelineDescriptor.h"
	#include "utils/GLFWUtils.h"
	#include "utils/WGPUHelpers.h"

	#include "GLFW/glfw3.h"

	class SwapChainValidationTests : public DawnTest {
	public:
	void SetUp() override {
	DawnTest::SetUp();
	DAWN_TEST_UNSUPPORTED_IF(UsesWire());
	DAWN_TEST_UNSUPPORTED_IF(HasToggleEnabled("skip_validation"));

	glfwSetErrorCallback([](int code, const char* message) {
	dawn::ErrorLog() << "GLFW error " << code << " " << message;
	});
	DAWN_TEST_UNSUPPORTED_IF(!glfwInit());

	// The SwapChainValidationTests don't create devices so we don't need to call
	// SetupGLFWWindowHintsForBackend. Set GLFW_NO_API anyway to avoid GLFW bringing up a GL
	// context that we won't use.
	ASSERT_TRUE(!IsOpenGL());
	glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
	window = glfwCreateWindow(400, 400, "SwapChainValidationTests window", nullptr, nullptr);

	surface = utils::CreateSurfaceForWindow(GetInstance(), window);
	ASSERT_NE(surface, nullptr);

	goodDescriptor.width = 1;
	goodDescriptor.height = 1;
	goodDescriptor.usage = wgpu::TextureUsage::RenderAttachment;
	goodDescriptor.format = wgpu::TextureFormat::BGRA8Unorm;
	goodDescriptor.presentMode = wgpu::PresentMode::Mailbox;

	badDescriptor = goodDescriptor;
	badDescriptor.width = 0;
	}

	void TearDown() override {
	// Destroy the surface before the window as required by webgpu-native.
	surface = wgpu::Surface();
	if (window != nullptr) {
	glfwDestroyWindow(window);
	}
	DawnTest::TearDown();
	}

	protected:
	GLFWwindow* window = nullptr;
	wgpu::Surface surface;
	wgpu::SwapChainDescriptor goodDescriptor;
	wgpu::SwapChainDescriptor badDescriptor;

	// Checks that a RenderAttachment view is an error by trying to create a render pass on it.
	void CheckTextureViewIsError(wgpu::TextureView view) {
	CheckTextureView(view, true, false);
	}

	// Checks that a RenderAttachment view is an error by trying to submit a render pass on it.
	void CheckTextureViewIsDestroyed(wgpu::TextureView view) {
	CheckTextureView(view, false, true);
	}

	// Checks that a RenderAttachment view is valid by submitting a render pass on it.
	void CheckTextureViewIsValid(wgpu::TextureView view) {
	CheckTextureView(view, false, false);
	}

	private:
	void CheckTextureView(wgpu::TextureView view, bool errorAtFinish, bool errorAtSubmit) {
	utils::ComboRenderPassDescriptor renderPassDesc({view});

	wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
	wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPassDesc);
	pass.EndPass();

	if (errorAtFinish) {
	ASSERT_DEVICE_ERROR(encoder.Finish());
	} else {
	wgpu::CommandBuffer commands = encoder.Finish();

	if (errorAtSubmit) {
	ASSERT_DEVICE_ERROR(queue.Submit(1, &commands));
	} else {
	queue.Submit(1, &commands);
	}
	}
	}
	};

	// Control case for a successful swapchain creation and presenting.
	TEST_P(SwapChainValidationTests, CreationSuccess) {
	wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);
	wgpu::TextureView view = swapchain.GetCurrentTextureView();
	swapchain.Present();
	}

	// Checks that the creation size must be a valid 2D texture size.
	TEST_P(SwapChainValidationTests, InvalidCreationSize) {
	// A width of 0 is invalid.
	{
	wgpu::SwapChainDescriptor desc = goodDescriptor;
	desc.width = 0;
	ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
	}
	// A height of 0 is invalid.
	{
	wgpu::SwapChainDescriptor desc = goodDescriptor;
	desc.height = 0;
	ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
	}

	// A width of kMaxTextureDimension2D is valid but kMaxTextureDimension2D + 1 isn't.
	{
	wgpu::SwapChainDescriptor desc = goodDescriptor;
	desc.width = kMaxTextureDimension2D;
	device.CreateSwapChain(surface, &desc);

	desc.width = kMaxTextureDimension2D + 1;
	ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
	}

	// A height of kMaxTextureDimension2D is valid but kMaxTextureDimension2D + 1 isn't.
	{
	wgpu::SwapChainDescriptor desc = goodDescriptor;
	desc.height = kMaxTextureDimension2D;
	device.CreateSwapChain(surface, &desc);

	desc.height = kMaxTextureDimension2D + 1;
	ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
	}
	}

	// Checks that the creation usage must be RenderAttachment
	TEST_P(SwapChainValidationTests, InvalidCreationUsage) {
	wgpu::SwapChainDescriptor desc = goodDescriptor;
	desc.usage = wgpu::TextureUsage::TextureBinding;
	ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
	}

	// Checks that the creation format must (currently) be BGRA8Unorm
	TEST_P(SwapChainValidationTests, InvalidCreationFormat) {
	wgpu::SwapChainDescriptor desc = goodDescriptor;
	desc.format = wgpu::TextureFormat::RGBA8Unorm;
	ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
	}

	// Checks that the implementation must be zero.
	TEST_P(SwapChainValidationTests, InvalidWithImplementation) {
	wgpu::SwapChainDescriptor desc = goodDescriptor;
	desc.implementation = 1;
	ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &desc));
	}

	// Check swapchain operations with an error swapchain are errors
	TEST_P(SwapChainValidationTests, OperationsOnErrorSwapChain) {
	wgpu::SwapChain swapchain;
	ASSERT_DEVICE_ERROR(swapchain = device.CreateSwapChain(surface, &badDescriptor));

	wgpu::TextureView view;
	ASSERT_DEVICE_ERROR(view = swapchain.GetCurrentTextureView());
	CheckTextureViewIsError(view);

	ASSERT_DEVICE_ERROR(swapchain.Present());
	}

	// Check it is invalid to call present without getting a current view.
	TEST_P(SwapChainValidationTests, PresentWithoutCurrentView) {
	wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);

	// Check it is invalid if we never called GetCurrentTextureView
	ASSERT_DEVICE_ERROR(swapchain.Present());

	// Check it is invalid if we never called since the last present.
	swapchain.GetCurrentTextureView();
	swapchain.Present();
	ASSERT_DEVICE_ERROR(swapchain.Present());
	}

	// Check that the current view isn't destroyed when the ref to the swapchain is lost because the
	// swapchain is kept alive by the surface. Also check after we lose all refs to the surface, the
	// texture is destroyed.
	TEST_P(SwapChainValidationTests, ViewValidAfterSwapChainRefLost) {
	wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);
	wgpu::TextureView view = swapchain.GetCurrentTextureView();

	swapchain = nullptr;
	CheckTextureViewIsValid(view);

	surface = nullptr;
	CheckTextureViewIsDestroyed(view);
	}

	// Check that the current view is the destroyed state after present.
	TEST_P(SwapChainValidationTests, ViewDestroyedAfterPresent) {
	wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);
	wgpu::TextureView view = swapchain.GetCurrentTextureView();
	swapchain.Present();

	CheckTextureViewIsDestroyed(view);
	}

	// Check that returned view is of the current format / usage / dimension / size / sample count
	TEST_P(SwapChainValidationTests, ReturnedViewCharacteristics) {
	utils::ComboRenderPipelineDescriptor pipelineDesc;
	pipelineDesc.vertex.module = utils::CreateShaderModule(device, R"(
	[[stage(vertex)]] fn main() -> [[builtin(position)]] vec4<f32> {
	return vec4<f32>(0.0, 0.0, 0.0, 1.0);
	})");
	pipelineDesc.cFragment.module = utils::CreateShaderModule(device, R"(
	struct FragmentOut {
	[[location(0)]] target0 : vec4<f32>;
	[[location(1)]] target1 : f32;
	};
	[[stage(fragment)]] fn main() -> FragmentOut {
	var out : FragmentOut;
	out.target0 = vec4<f32>(0.0, 1.0, 0.0, 1.0);
	out.target1 = 0.5;
	return out;
	})");
	// Validation will check that the sample count of the view matches this format.
	pipelineDesc.multisample.count = 1;
	pipelineDesc.cFragment.targetCount = 2;
	// Validation will check that the format of the view matches this format.
	pipelineDesc.cTargets[0].format = wgpu::TextureFormat::BGRA8Unorm;
	pipelineDesc.cTargets[1].format = wgpu::TextureFormat::R8Unorm;
	device.CreateRenderPipeline(&pipelineDesc);

	// Create a second texture to be used as render pass attachment. Validation will check that the
	// size of the view matches the size of this texture.
	wgpu::TextureDescriptor textureDesc;
	textureDesc.usage = wgpu::TextureUsage::RenderAttachment;
	textureDesc.dimension = wgpu::TextureDimension::e2D;
	textureDesc.size = {1, 1, 1};
	textureDesc.format = wgpu::TextureFormat::R8Unorm;
	textureDesc.sampleCount = 1;
	wgpu::Texture secondTexture = device.CreateTexture(&textureDesc);

	// Get the swapchain view and try to use it in the render pass to trigger all the validation.
	wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);
	wgpu::TextureView view = swapchain.GetCurrentTextureView();

	// Validation will also check the dimension of the view is 2D, and it's usage contains
	// RenderAttachment
	utils::ComboRenderPassDescriptor renderPassDesc({view, secondTexture.CreateView()});
	wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
	wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPassDesc);
	pass.EndPass();
	wgpu::CommandBuffer commands = encoder.Finish();

	queue.Submit(1, &commands);

	// Check that view doesn't have extra formats like Sampled.
	// TODO(cwallez@chromium.org): also check for [Readonly]Storage once that's implemented.
	wgpu::BindGroupLayout bgl = utils::MakeBindGroupLayout(
	device, {{0, wgpu::ShaderStage::Fragment, wgpu::TextureSampleType::Float}});
	ASSERT_DEVICE_ERROR(utils::MakeBindGroup(device, bgl, {{0, view}}));
	}

	// Check that failing to create a new swapchain doesn't replace the previous one.
	TEST_P(SwapChainValidationTests, ErrorSwapChainDoesntReplacePreviousOne) {
	wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);
	ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &badDescriptor));

	wgpu::TextureView view = swapchain.GetCurrentTextureView();
	swapchain.Present();
	}

	// Check that after replacement, all swapchain operations are errors and the view is destroyed.
	TEST_P(SwapChainValidationTests, ReplacedSwapChainIsInvalid) {
	{
	wgpu::SwapChain replacedSwapChain = device.CreateSwapChain(surface, &goodDescriptor);
	device.CreateSwapChain(surface, &goodDescriptor);
	ASSERT_DEVICE_ERROR(replacedSwapChain.GetCurrentTextureView());
	}

	{
	wgpu::SwapChain replacedSwapChain = device.CreateSwapChain(surface, &goodDescriptor);
	wgpu::TextureView view = replacedSwapChain.GetCurrentTextureView();
	device.CreateSwapChain(surface, &goodDescriptor);

	CheckTextureViewIsDestroyed(view);
	ASSERT_DEVICE_ERROR(replacedSwapChain.Present());
	}
	}

	// Check that after surface destruction, all swapchain operations are errors and the view is
	// destroyed. The test is split in two to reset the wgpu::Surface in the middle.
	TEST_P(SwapChainValidationTests, SwapChainIsInvalidAfterSurfaceDestruction_GetView) {
	wgpu::SwapChain replacedSwapChain = device.CreateSwapChain(surface, &goodDescriptor);
	surface = nullptr;
	ASSERT_DEVICE_ERROR(replacedSwapChain.GetCurrentTextureView());
	}
	TEST_P(SwapChainValidationTests, SwapChainIsInvalidAfterSurfaceDestruction_AfterGetView) {
	wgpu::SwapChain replacedSwapChain = device.CreateSwapChain(surface, &goodDescriptor);
	wgpu::TextureView view = replacedSwapChain.GetCurrentTextureView();
	surface = nullptr;

	CheckTextureViewIsDestroyed(view);
	ASSERT_DEVICE_ERROR(replacedSwapChain.Present());
	}

	// Test that after Device is Lost, all swap chain operations fail
	static void ToMockDeviceLostCallback(const char* message, void* userdata) {
	DawnTest* self = static_cast<DawnTest*>(userdata);
	self->StartExpectDeviceError();
	}

	// Test that new swap chain present fails after device is lost
	TEST_P(SwapChainValidationTests, NewSwapChainPresentFailsAfterDeviceLost) {
	device.SetDeviceLostCallback(ToMockDeviceLostCallback, this);
	wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);
	wgpu::TextureView view = swapchain.GetCurrentTextureView();

	device.LoseForTesting();
	ASSERT_DEVICE_ERROR(swapchain.Present());
	}

	// Test that new swap chain get current texture view fails after device is lost
	TEST_P(SwapChainValidationTests, NewSwapChainGetCurrentTextureViewFailsAfterDevLost) {
	device.SetDeviceLostCallback(ToMockDeviceLostCallback, this);
	wgpu::SwapChain swapchain = device.CreateSwapChain(surface, &goodDescriptor);

	device.LoseForTesting();
	ASSERT_DEVICE_ERROR(swapchain.GetCurrentTextureView());
	}

	// Test that creation of a new swapchain fails after device is lost
	TEST_P(SwapChainValidationTests, CreateNewSwapChainFailsAfterDevLost) {
	device.SetDeviceLostCallback(ToMockDeviceLostCallback, this);
	device.LoseForTesting();

	ASSERT_DEVICE_ERROR(device.CreateSwapChain(surface, &goodDescriptor));
	}

	DAWN_INSTANTIATE_TEST(SwapChainValidationTests, MetalBackend(), NullBackend());