Add tests for clears, render passes, framebuffers (#107)

* Add tests for clears, render passes, framebuffers

* Test load with a draw in it

src/backend/Framebuffer.cpp

@@ -103,19 +103,10 @@ namespace backend {
             return nullptr;
         }
 
-        // TODO(kainino@chromium.org): Remove this flag when the
-        // null=backbuffer hack is removed. Then, using null texture views can
-        // be completely disallowed.
-        bool usingBackbufferHack = false;
         for (auto& textureView : textureViews) {
             if (!textureView) {
-                if (usingBackbufferHack) {
+                HandleError("Framebuffer attachment not set");
-                    // TODO(kainino@chromium.org) update this too
+                return nullptr;
-                    HandleError("Framebuffer has more than one null attachment");
-                    return nullptr;
-                }
-                usingBackbufferHack = true;
-                continue;
             }
 
             // TODO(cwallez@chromium.org): Adjust for the mip-level once that is supported.

src/backend/RenderPass.cpp

@@ -94,6 +94,23 @@ namespace backend {
             }
         }
 
+        for (const auto& subpass : subpasses) {
+            for (unsigned int location : IterateBitSet(subpass.colorAttachmentsSet)) {
+                uint32_t slot = subpass.colorAttachments[location];
+                if (TextureFormatHasDepthOrStencil(attachments[slot].format)) {
+                    HandleError("Render pass color attachment is not of a color format");
+                    return nullptr;
+                }
+            }
+            if (subpass.depthStencilAttachmentSet) {
+                uint32_t slot = subpass.depthStencilAttachment;
+                if (!TextureFormatHasDepthOrStencil(attachments[slot].format)) {
+                    HandleError("Render pass depth/stencil attachment is not of a depth/stencil format");
+                    return nullptr;
+                }
+            }
+        }
+
         return device->CreateRenderPass(this);
     }
 

src/backend/opengl/CommandBufferGL.cpp

@@ -97,6 +97,11 @@ namespace opengl {
                     {
                         commands.NextCommand<BeginRenderSubpassCmd>();
 
+                        // TODO(kainino@chromium.org): This is added to possibly
+                        // work around an issue seen on Windows/Intel. It should
+                        // break any feedback loop before the clears, even if
+                        // there shouldn't be any negative effects from this.
+                        // Investigate whether it's actually needed.
                         glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
                         // TODO(kainino@chromium.org): possible future
                         // optimization: create these framebuffers at

src/tests/CMakeLists.txt

@@ -75,6 +75,7 @@ add_executable(nxt_end2end_tests
     ${END2END_TESTS_DIR}/DepthStencilStateTests.cpp
     ${END2END_TESTS_DIR}/InputStateTests.cpp
     ${END2END_TESTS_DIR}/PrimitiveTopologyTests.cpp
+    ${END2END_TESTS_DIR}/RenderPassLoadOpTests.cpp
     ${TESTS_DIR}/End2EndTestsMain.cpp
     ${TESTS_DIR}/NXTTest.cpp
     ${TESTS_DIR}/NXTTest.h

src/tests/NXTTest.cpp

@@ -18,6 +18,7 @@
 #include "common/Constants.h"
 #include "common/Math.h"
 #include "utils/BackendBinding.h"
+#include "utils/NXTHelpers.h"
 #include "utils/SystemUtils.h"
 
 #include "GLFW/glfw3.h"

src/tests/NXTTest.h

@@ -31,7 +31,7 @@
     AddTextureExpectation(__FILE__, __LINE__, texture, x, y, 1, 1, 0, sizeof(RGBA8), new detail::ExpectEq<RGBA8>(expected))
 
 #define EXPECT_TEXTURE_RGBA8_EQ(expected, texture, x, y, width, height, level) \
-    AddTextureExpectation(__FILE__, __LINE__, texture, x, y, width, height, level, sizeof(RGBA8), new detail::ExpectEq<RGBA8>(expected, width * height))
+    AddTextureExpectation(__FILE__, __LINE__, texture, x, y, width, height, level, sizeof(RGBA8), new detail::ExpectEq<RGBA8>(expected, (width) * (height)))
 
 struct RGBA8 {
     constexpr RGBA8() : RGBA8(0,0,0,0) {}

src/tests/end2end/RenderPassLoadOpTests.cpp

@@ -0,0 +1,188 @@
+// Copyright 2017 The NXT 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/NXTTest.h"
+
+#include "utils/NXTHelpers.h"
+
+#include <array>
+
+constexpr static unsigned int kRTSize = 16;
+
+class DrawQuad {
+    public:
+        DrawQuad() {}
+        DrawQuad(nxt::Device* device, const char* vsSource, const char* fsSource)
+            : device(device) {
+                vsModule = utils::CreateShaderModule(*device, nxt::ShaderStage::Vertex, vsSource);
+                fsModule = utils::CreateShaderModule(*device, nxt::ShaderStage::Fragment, fsSource);
+
+                pipelineLayout = device->CreatePipelineLayoutBuilder()
+                    .GetResult();
+            }
+
+        void Draw(const nxt::RenderPass& renderpass, nxt::CommandBufferBuilder* builder) {
+            auto renderPipeline = device->CreateRenderPipelineBuilder()
+                .SetSubpass(renderpass, 0)
+                .SetLayout(pipelineLayout)
+                .SetStage(nxt::ShaderStage::Vertex, vsModule, "main")
+                .SetStage(nxt::ShaderStage::Fragment, fsModule, "main")
+                .GetResult();
+
+            builder->SetRenderPipeline(renderPipeline);
+            builder->DrawArrays(6, 1, 0, 0);
+        }
+
+    private:
+        nxt::Device* device = nullptr;
+        nxt::ShaderModule vsModule = {};
+        nxt::ShaderModule fsModule = {};
+        nxt::PipelineLayout pipelineLayout = {};
+};
+
+class RenderPassLoadOpTests : public NXTTest {
+    protected:
+        void SetUp() override {
+            NXTTest::SetUp();
+
+            renderTarget = device.CreateTextureBuilder()
+                .SetDimension(nxt::TextureDimension::e2D)
+                .SetExtent(kRTSize, kRTSize, 1)
+                .SetFormat(nxt::TextureFormat::R8G8B8A8Unorm)
+                .SetMipLevels(1)
+                .SetAllowedUsage(nxt::TextureUsageBit::OutputAttachment | nxt::TextureUsageBit::TransferSrc)
+                .SetInitialUsage(nxt::TextureUsageBit::OutputAttachment)
+                .GetResult();
+
+            renderTargetView = renderTarget.CreateTextureViewBuilder().GetResult();
+
+            RGBA8 zero(0, 0, 0, 0);
+            std::fill(expectZero.begin(), expectZero.end(), zero);
+
+            RGBA8 green(0, 255, 0, 255);
+            std::fill(expectGreen.begin(), expectGreen.end(), green);
+
+            RGBA8 blue(0, 0, 255, 255);
+            std::fill(expectBlue.begin(), expectBlue.end(), blue);
+
+            // draws a blue quad on the right half of the screen
+            const char* vsSource = R"(
+                #version 450
+                void main() {
+                    const vec2 pos[6] = vec2[6](
+                        vec2(0, -1), vec2(1, -1), vec2(0, 1),
+                        vec2(0,  1), vec2(1, -1), vec2(1, 1));
+                    gl_Position = vec4(pos[gl_VertexIndex], 0.f, 1.f);
+                }
+                )";
+            const char* fsSource = R"(
+                #version 450
+                out vec4 color;
+                void main() {
+                    color = vec4(0.f, 0.f, 1.f, 1.f);
+                }
+                )";
+            blueQuad = DrawQuad(&device, vsSource, fsSource);
+        }
+
+        nxt::Texture renderTarget;
+        nxt::TextureView renderTargetView;
+
+        std::array<RGBA8, kRTSize * kRTSize> expectZero;
+        std::array<RGBA8, kRTSize * kRTSize> expectGreen;
+        std::array<RGBA8, kRTSize * kRTSize> expectBlue;
+
+        DrawQuad blueQuad = {};
+};
+
+// Tests clearing, loading, and drawing into color attachments
+TEST_P(RenderPassLoadOpTests, ColorClearThenLoadAndDraw) {
+    if (IsOpenGL()) {
+        // TODO(kainino@chromium.org): currently fails on OpenGL backend
+        return;
+    }
+
+    // Part 1: clear once, check to make sure it's cleared
+
+    auto renderpass1 = device.CreateRenderPassBuilder()
+        .SetAttachmentCount(1)
+        .SetSubpassCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        .AttachmentSetColorLoadOp(0, nxt::LoadOp::Clear)
+        .SubpassSetColorAttachment(0, 0, 0)
+        .GetResult();
+    auto framebuffer1 = device.CreateFramebufferBuilder()
+        .SetRenderPass(renderpass1)
+        .SetDimensions(kRTSize, kRTSize)
+        .SetAttachment(0, renderTargetView)
+        .GetResult();
+
+    auto commands1 = device.CreateCommandBufferBuilder()
+        .BeginRenderPass(renderpass1, framebuffer1)
+        .BeginRenderSubpass()
+            // Clear should occur implicitly
+            // Store should occur implicitly
+        .EndRenderSubpass()
+        .EndRenderPass()
+        .GetResult();
+
+    framebuffer1.AttachmentSetClearColor(0, 0.0f, 0.0f, 0.0f, 0.0f); // zero
+    queue.Submit(1, &commands1);
+    // Cleared to zero
+    EXPECT_TEXTURE_RGBA8_EQ(expectZero.data(), renderTarget, 0, 0, kRTSize, kRTSize, 0);
+
+    framebuffer1.AttachmentSetClearColor(0, 0.0f, 1.0f, 0.0f, 1.0f); // green
+    queue.Submit(1, &commands1);
+    // Now cleared to green
+    EXPECT_TEXTURE_RGBA8_EQ(expectGreen.data(), renderTarget, 0, 0, kRTSize, kRTSize, 0);
+
+    // Part 2: draw a blue quad into the right half of the render target, and check result
+
+    auto renderpass2 = device.CreateRenderPassBuilder()
+        .SetAttachmentCount(1)
+        .SetSubpassCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        .AttachmentSetColorLoadOp(0, nxt::LoadOp::Load)
+        .SubpassSetColorAttachment(0, 0, 0)
+        .GetResult();
+    auto framebuffer2 = device.CreateFramebufferBuilder()
+        .SetRenderPass(renderpass2)
+        .SetDimensions(kRTSize, kRTSize)
+        .SetAttachment(0, renderTargetView)
+        .GetResult();
+    framebuffer2.AttachmentSetClearColor(0, 1.0f, 0.0f, 0.0f, 1.0f); // red
+
+    nxt::CommandBuffer commands2;
+    {
+        auto builder = device.CreateCommandBufferBuilder()
+            .BeginRenderPass(renderpass2, framebuffer2)
+            .BeginRenderSubpass()
+            // Clear should occur implicitly
+            .Clone();
+        blueQuad.Draw(renderpass2, &builder);
+        commands2 = builder
+            // Store should occur implicitly
+            .EndRenderSubpass()
+            .EndRenderPass()
+            .GetResult();
+    }
+
+    queue.Submit(1, &commands2);
+    // Left half should still be green
+    EXPECT_TEXTURE_RGBA8_EQ(expectGreen.data(), renderTarget, 0, 0, kRTSize / 2, kRTSize, 0);
+    // Right half should now be blue
+    EXPECT_TEXTURE_RGBA8_EQ(expectBlue.data(), renderTarget, kRTSize / 2, 0, kRTSize / 2, kRTSize, 0);
+}
+
+NXT_INSTANTIATE_TEST(RenderPassLoadOpTests, D3D12Backend, MetalBackend, OpenGLBackend)

src/tests/unittests/validation/FramebufferValidationTests.cpp

@@ -29,6 +29,21 @@ class FramebufferValidationTest : public ValidationTest {
             return attachment.CreateTextureViewBuilder()
                 .GetResult();
         }
+
+        nxt::Framebuffer CreateFramebufferWithAttachment(uint32_t width, uint32_t height, nxt::TextureFormat format) {
+            auto renderpass = AssertWillBeSuccess(device.CreateRenderPassBuilder())
+                .SetAttachmentCount(1)
+                .AttachmentSetFormat(0, format)
+                .SetSubpassCount(1)
+                .SubpassSetColorAttachment(0, 0, 0)
+                .GetResult();
+            nxt::TextureView attachment = Create2DAttachment(width, height, format);
+            return AssertWillBeSuccess(device.CreateFramebufferBuilder())
+                .SetRenderPass(renderpass)
+                .SetAttachment(0, attachment)
+                .SetDimensions(100, 100)
+                .GetResult();
+        }
 };
 
 // Test for an empty framebuffer builder
@@ -73,12 +88,29 @@ TEST_F(FramebufferValidationTest, BasicWithEmptyAttachment) {
         .SetSubpassCount(1)
         .SubpassSetColorAttachment(0, 0, 0)
         .GetResult();
-    auto framebuffer = AssertWillBeSuccess(device.CreateFramebufferBuilder())
+    AssertWillBeError(device.CreateFramebufferBuilder())
         .SetRenderPass(renderpass)
         .SetDimensions(100, 100)
         .GetResult();
 }
 
+// Test for a basic framebuffer with one attachment
+TEST_F(FramebufferValidationTest, BasicWithOneAttachment) {
+    CreateFramebufferWithAttachment(100, 100, nxt::TextureFormat::R8G8B8A8Unorm);
+}
+
+// Tests for setting clear values
+TEST_F(FramebufferValidationTest, ClearValues) {
+    auto framebuffer = CreateFramebufferWithAttachment(100, 100, nxt::TextureFormat::R8G8B8A8Unorm);
+
+    // Set clear color value for attachment 0
+    framebuffer.AttachmentSetClearColor(0, 0.0f, 0.0f, 0.0f, 0.0f);
+    // Set clear depth/stencil values for attachment 0 - ok, but ignored, since it's a color attachment
+    framebuffer.AttachmentSetClearDepthStencil(0, 0.0f, 0);
+    // Set clear color value for attachment 1 - should fail
+    ASSERT_DEVICE_ERROR(framebuffer.AttachmentSetClearColor(1, 0.0f, 0.0f, 0.0f, 0.0f));
+}
+
 // Check validation that the attachment size must be the same as the framebuffer size.
 // TODO(cwallez@chromium.org): Investigate this constraint more, for example Vulkan requires
 // that the attachment sizes are *at least* the framebuffer size.
@@ -121,3 +153,75 @@ TEST_F(FramebufferValidationTest, AttachmentSizeMatchFramebufferSize) {
 
     // TODO(cwallez@chromium.org): also test with a mismatches depth / stencil
 }
+
+TEST_F(FramebufferValidationTest, AttachmentFormatMatchTextureFormat) {
+    // Control case: attach color attachment to color slot
+    {
+        auto renderpass = AssertWillBeSuccess(device.CreateRenderPassBuilder())
+            .SetAttachmentCount(1)
+            .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+            .SetSubpassCount(1)
+            .SubpassSetColorAttachment(0, 0, 0)
+            .GetResult();
+
+        nxt::TextureView attachment = Create2DAttachment(100, 100, nxt::TextureFormat::R8G8B8A8Unorm);
+        auto framebuffer = AssertWillBeSuccess(device.CreateFramebufferBuilder())
+            .SetRenderPass(renderpass)
+            .SetAttachment(0, attachment)
+            .SetDimensions(100, 100)
+            .GetResult();
+    }
+
+    // Error: attach color attachment to depth slot, setting the attachment format first
+    {
+        auto renderpass = AssertWillBeSuccess(device.CreateRenderPassBuilder())
+            .SetAttachmentCount(1)
+            .SetSubpassCount(1)
+            .AttachmentSetFormat(0, nxt::TextureFormat::D32FloatS8Uint)
+            .SubpassSetDepthStencilAttachment(0, 0)
+            .GetResult();
+
+        nxt::TextureView attachment = Create2DAttachment(100, 100, nxt::TextureFormat::R8G8B8A8Unorm);
+        auto framebuffer = AssertWillBeError(device.CreateFramebufferBuilder())
+            .SetRenderPass(renderpass)
+            .SetAttachment(0, attachment)
+            .SetDimensions(100, 100)
+            .GetResult();
+    }
+
+    // Error: attach color attachment to depth slot, but setting the attachment format last
+    {
+        auto renderpass = AssertWillBeSuccess(device.CreateRenderPassBuilder())
+            .SetSubpassCount(1)
+            .SetAttachmentCount(1)
+            .SubpassSetDepthStencilAttachment(0, 0)
+            .AttachmentSetFormat(0, nxt::TextureFormat::D32FloatS8Uint)
+            .GetResult();
+
+        nxt::TextureView attachment = Create2DAttachment(100, 100, nxt::TextureFormat::R8G8B8A8Unorm);
+        auto framebuffer = AssertWillBeError(device.CreateFramebufferBuilder())
+            .SetRenderPass(renderpass)
+            .SetAttachment(0, attachment)
+            .SetDimensions(100, 100)
+            .GetResult();
+    }
+
+    // Error: attach depth texture to color slot
+    {
+        auto renderpass = AssertWillBeSuccess(device.CreateRenderPassBuilder())
+            .SetAttachmentCount(1)
+            .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+            .SetSubpassCount(1)
+            .SubpassSetColorAttachment(0, 0, 0)
+            .GetResult();
+
+        nxt::TextureView attachment = Create2DAttachment(100, 100, nxt::TextureFormat::D32FloatS8Uint);
+        auto framebuffer = AssertWillBeError(device.CreateFramebufferBuilder())
+            .SetRenderPass(renderpass)
+            .SetAttachment(0, attachment)
+            .SetDimensions(100, 100)
+            .GetResult();
+    }
+
+    // TODO(kainino@chromium.org): also check attachment samples, etc.
+}

src/tests/unittests/validation/RenderPassValidationTests.cpp

@@ -37,6 +37,123 @@ TEST_F(RenderPassValidationTest, OneSubpassOneAttachment) {
         .SetSubpassCount(1)
         .SetAttachmentCount(1)
         .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        // without a load op
+        .SubpassSetColorAttachment(0, 0, 0)
+        .GetResult();
+}
+
+// Tests for setting attachment load ops
+TEST_F(RenderPassValidationTest, AttachmentLoadOps) {
+    AssertWillBeSuccess(device.CreateRenderPassBuilder())
+        .SetSubpassCount(1)
+        .SetAttachmentCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        // with a load op
+        .AttachmentSetColorLoadOp(0, nxt::LoadOp::Clear)
+        .SubpassSetColorAttachment(0, 0, 0)
+        .GetResult();
+
+    AssertWillBeSuccess(device.CreateRenderPassBuilder())
+        .SetSubpassCount(1)
+        .SetAttachmentCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        // with a load op of the wrong type - this is okay, just ignored
+        .AttachmentSetDepthStencilLoadOps(0, nxt::LoadOp::Clear, nxt::LoadOp::Clear)
+        .SubpassSetColorAttachment(0, 0, 0)
+        .GetResult();
+}
+
+// Test for attachment slot arguments out of bounds
+TEST_F(RenderPassValidationTest, AttachmentOutOfBounds) {
+    // Control case
+    AssertWillBeSuccess(device.CreateRenderPassBuilder())
+        .SetSubpassCount(1)
+        .SetAttachmentCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        .GetResult();
+
+    AssertWillBeError(device.CreateRenderPassBuilder())
+        .SetSubpassCount(1)
+        .SetAttachmentCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        // Test AttachmentSetFormat slot out of bounds
+        .AttachmentSetFormat(1, nxt::TextureFormat::R8G8B8A8Unorm)
+        .GetResult();
+
+    AssertWillBeError(device.CreateRenderPassBuilder())
+        .SetSubpassCount(1)
+        .SetAttachmentCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        // Test AttachmentSetColorLoadOp slot out of bounds
+        .AttachmentSetColorLoadOp(1, nxt::LoadOp::Clear)
+        .GetResult();
+
+    AssertWillBeError(device.CreateRenderPassBuilder())
+        .SetSubpassCount(1)
+        .SetAttachmentCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        // Test AttachmentSetDepthStencilLoadOps slot out of bounds
+        .AttachmentSetDepthStencilLoadOps(1, nxt::LoadOp::Clear, nxt::LoadOp::Clear)
+        .GetResult();
+
+    AssertWillBeError(device.CreateRenderPassBuilder())
+        .SetSubpassCount(1)
+        .SetAttachmentCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        // Test SubpassSetColorAttachment attachment slot out of bounds
+        .SubpassSetColorAttachment(0, 0, 1)
+        .GetResult();
+
+    AssertWillBeError(device.CreateRenderPassBuilder())
+        .SetSubpassCount(1)
+        .SetAttachmentCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        // Test SubpassSetDepthStencilAttachment attachment slot out of bounds
+        .SubpassSetDepthStencilAttachment(0, 1)
+        .GetResult();
+}
+
+// Test for subpass arguments out of bounds
+TEST_F(RenderPassValidationTest, SubpassOutOfBounds) {
+    // Control case
+    AssertWillBeSuccess(device.CreateRenderPassBuilder())
+        .SetSubpassCount(1)
+        .SetAttachmentCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        .SubpassSetColorAttachment(0, 0, 0)
+        .GetResult();
+
+    AssertWillBeError(device.CreateRenderPassBuilder())
+        .SetSubpassCount(1)
+        .SetAttachmentCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        .SubpassSetColorAttachment(0, 0, 0)
+        // Test SubpassSetColorAttachment subpass out of bounds
+        .SubpassSetColorAttachment(1, 0, 0)
+        .GetResult();
+
+    AssertWillBeError(device.CreateRenderPassBuilder())
+        .SetSubpassCount(1)
+        .SetAttachmentCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::D32FloatS8Uint)
+        // Test SubpassSetDepthStencilAttachment subpass out of bounds
+        .SubpassSetDepthStencilAttachment(1, 0)
+        .GetResult();
+}
+
+// Test attaching depth/stencil textures to color attachments and vice versa
+TEST_F(RenderPassValidationTest, SubpassAttachmentWrongAspect) {
+    AssertWillBeError(device.CreateRenderPassBuilder())
+        .SetSubpassCount(1)
+        .SetAttachmentCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        .SubpassSetDepthStencilAttachment(0, 0)
+        .GetResult();
+
+    AssertWillBeError(device.CreateRenderPassBuilder())
+        .SetSubpassCount(1)
+        .SetAttachmentCount(1)
+        .AttachmentSetFormat(0, nxt::TextureFormat::D32FloatS8Uint)
         .SubpassSetColorAttachment(0, 0, 0)
         .GetResult();
 }