Add unlit rendering integration coverage

docs/plan/Shader与Material系统下一阶段计划.md

@@ -384,6 +384,17 @@ Unity-like Shader Authoring (.shader)
 - `rendering_integration_unlit_scene`
 - `rendering_integration_object_id_scene`
 
+当前进展（`2026-04-04`）：
+
+- 已完成：`rendering_integration_unlit_scene`
+  - 显式使用 builtin `unlit` shader + `Unlit` pass，覆盖 `BuiltinForwardPipeline` 的 `ForwardLit / Unlit` pass 选择路径
+  - 复用 `textured_quad_scene` 构图做最小差异回归，验证 shader/material 新 contract 不改变既有画面输出
+- 已验证：`rendering_integration_unlit_scene`
+  - D3D12：通过
+  - OpenGL：通过
+  - Vulkan：通过
+- 下一步：补 `rendering_integration_object_id_scene` 或等价的 object-id integration coverage，完成本阶段收口
+
 ## 7. 当前阶段明确不做
 
 下一阶段不应把范围扩散到下面这些方向：

tests/Rendering/CMakeLists.txt

@@ -13,6 +13,7 @@ add_custom_target(rendering_unit_test_targets
 add_custom_target(rendering_integration_tests
     DEPENDS
         rendering_integration_textured_quad_scene
+        rendering_integration_unlit_scene
         rendering_integration_backpack_scene
         rendering_integration_backpack_lit_scene
         rendering_integration_camera_stack_scene

tests/Rendering/integration/CMakeLists.txt

@@ -3,6 +3,7 @@ cmake_minimum_required(VERSION 3.15)
 project(XCEngine_RenderingIntegrationTests)
 
 add_subdirectory(textured_quad_scene)
+add_subdirectory(unlit_scene)
 add_subdirectory(backpack_scene)
 add_subdirectory(backpack_lit_scene)
 add_subdirectory(camera_stack_scene)

tests/Rendering/integration/unlit_scene/CMakeLists.txt

@@ -0,0 +1,63 @@
+cmake_minimum_required(VERSION 3.15)
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+
+project(rendering_integration_unlit_scene)
+
+set(ENGINE_ROOT_DIR ${CMAKE_SOURCE_DIR}/engine)
+set(PACKAGE_DIR ${CMAKE_SOURCE_DIR}/mvs/OpenGL/package)
+
+get_filename_component(PROJECT_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../.. ABSOLUTE)
+
+find_package(Vulkan QUIET)
+
+add_executable(rendering_integration_unlit_scene
+    main.cpp
+    ${CMAKE_SOURCE_DIR}/tests/RHI/integration/fixtures/RHIIntegrationFixture.cpp
+    ${PACKAGE_DIR}/src/glad.c
+)
+
+target_include_directories(rendering_integration_unlit_scene PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    ${CMAKE_SOURCE_DIR}/tests/RHI/integration/fixtures
+    ${ENGINE_ROOT_DIR}/include
+    ${PACKAGE_DIR}/include
+    ${PROJECT_ROOT_DIR}/engine/src
+)
+
+target_link_libraries(rendering_integration_unlit_scene PRIVATE
+    d3d12
+    dxgi
+    d3dcompiler
+    winmm
+    opengl32
+    XCEngine
+    GTest::gtest
+)
+
+if(TARGET Vulkan::Vulkan)
+    target_link_libraries(rendering_integration_unlit_scene PRIVATE Vulkan::Vulkan)
+    target_compile_definitions(rendering_integration_unlit_scene PRIVATE XCENGINE_SUPPORT_VULKAN)
+endif()
+
+target_compile_definitions(rendering_integration_unlit_scene PRIVATE
+    UNICODE
+    _UNICODE
+    XCENGINE_SUPPORT_OPENGL
+    XCENGINE_SUPPORT_D3D12
+)
+
+add_custom_command(TARGET rendering_integration_unlit_scene POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+        ${CMAKE_SOURCE_DIR}/tests/RHI/integration/compare_ppm.py
+        $<TARGET_FILE_DIR:rendering_integration_unlit_scene>/
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+        ${CMAKE_SOURCE_DIR}/tests/Rendering/integration/textured_quad_scene/GT.ppm
+        $<TARGET_FILE_DIR:rendering_integration_unlit_scene>/GT.ppm
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+        ${ENGINE_ROOT_DIR}/third_party/renderdoc/renderdoc.dll
+        $<TARGET_FILE_DIR:rendering_integration_unlit_scene>/
+)
+
+include(GoogleTest)
+gtest_discover_tests(rendering_integration_unlit_scene)

tests/Rendering/integration/unlit_scene/main.cpp

@@ -0,0 +1,325 @@
+#include <gtest/gtest.h>
+
+#include "../RenderingIntegrationMain.h"
+
+#include <XCEngine/Components/CameraComponent.h>
+#include <XCEngine/Components/GameObject.h>
+#include <XCEngine/Components/MeshFilterComponent.h>
+#include <XCEngine/Components/MeshRendererComponent.h>
+#include <XCEngine/Core/Asset/IResource.h>
+#include <XCEngine/Core/Math/Color.h>
+#include <XCEngine/Core/Math/Vector2.h>
+#include <XCEngine/Core/Math/Vector3.h>
+#include <XCEngine/Debug/ConsoleLogSink.h>
+#include <XCEngine/Debug/Logger.h>
+#include <XCEngine/Rendering/RenderContext.h>
+#include <XCEngine/Rendering/RenderSurface.h>
+#include <XCEngine/Rendering/SceneRenderer.h>
+#include <XCEngine/Resources/BuiltinResources.h>
+#include <XCEngine/Resources/Material/Material.h>
+#include <XCEngine/Resources/Mesh/Mesh.h>
+#include <XCEngine/Resources/Shader/Shader.h>
+#include <XCEngine/Resources/Texture/Texture.h>
+#include <XCEngine/RHI/RHITexture.h>
+#include <XCEngine/Scene/Scene.h>
+
+#include "../../../RHI/integration/fixtures/RHIIntegrationFixture.h"
+
+#include <cstdlib>
+#include <memory>
+#include <vector>
+
+using namespace XCEngine::Components;
+using namespace XCEngine::Debug;
+using namespace XCEngine::Math;
+using namespace XCEngine::Rendering;
+using namespace XCEngine::Resources;
+using namespace XCEngine::RHI;
+using namespace XCEngine::RHI::Integration;
+
+namespace {
+
+constexpr const char* kD3D12Screenshot = "unlit_scene_d3d12.ppm";
+constexpr const char* kOpenGLScreenshot = "unlit_scene_opengl.ppm";
+constexpr const char* kVulkanScreenshot = "unlit_scene_vulkan.ppm";
+constexpr uint32_t kFrameWidth = 1280;
+constexpr uint32_t kFrameHeight = 720;
+
+Mesh* CreateQuadMesh() {
+    auto* mesh = new Mesh();
+    IResource::ConstructParams params = {};
+    params.name = "UnlitQuad";
+    params.path = "Tests/Rendering/UnlitQuad.mesh";
+    params.guid = ResourceGUID::Generate(params.path);
+    mesh->Initialize(params);
+
+    StaticMeshVertex vertices[4] = {};
+    vertices[0].position = Vector3(-1.0f, -1.0f, 0.0f);
+    vertices[0].uv0 = Vector2(0.0f, 1.0f);
+    vertices[1].position = Vector3(-1.0f, 1.0f, 0.0f);
+    vertices[1].uv0 = Vector2(0.0f, 0.0f);
+    vertices[2].position = Vector3(1.0f, -1.0f, 0.0f);
+    vertices[2].uv0 = Vector2(1.0f, 1.0f);
+    vertices[3].position = Vector3(1.0f, 1.0f, 0.0f);
+    vertices[3].uv0 = Vector2(1.0f, 0.0f);
+
+    const uint32_t indices[6] = { 0, 1, 2, 2, 1, 3 };
+    mesh->SetVertexData(
+        vertices,
+        sizeof(vertices),
+        4,
+        sizeof(StaticMeshVertex),
+        VertexAttribute::Position | VertexAttribute::UV0);
+    mesh->SetIndexData(indices, sizeof(indices), 6, true);
+
+    MeshSection section = {};
+    section.baseVertex = 0;
+    section.vertexCount = 4;
+    section.startIndex = 0;
+    section.indexCount = 6;
+    section.materialID = 0;
+    mesh->AddSection(section);
+
+    return mesh;
+}
+
+Texture* CreateCheckerTexture() {
+    auto* texture = new Texture();
+    IResource::ConstructParams params = {};
+    params.name = "Checker";
+    params.path = "Tests/Rendering/Checker.texture";
+    params.guid = ResourceGUID::Generate(params.path);
+    texture->Initialize(params);
+
+    const unsigned char pixels[16] = {
+        255,  32,  32, 255,
+         32, 255,  32, 255,
+         32,  32, 255, 255,
+        255, 255,  32, 255
+    };
+    texture->Create(
+        2,
+        2,
+        1,
+        1,
+        XCEngine::Resources::TextureType::Texture2D,
+        XCEngine::Resources::TextureFormat::RGBA8_UNORM,
+        pixels,
+        sizeof(pixels));
+    return texture;
+}
+
+Material* CreateMaterial(Texture* texture) {
+    auto* material = new Material();
+    IResource::ConstructParams params = {};
+    params.name = "QuadUnlitMaterial";
+    params.path = "Tests/Rendering/QuadUnlit.material";
+    params.guid = ResourceGUID::Generate(params.path);
+    material->Initialize(params);
+    material->SetShader(ResourceManager::Get().Load<Shader>(GetBuiltinUnlitShaderPath()));
+    material->SetShaderPass("Unlit");
+    material->SetTexture("_MainTex", ResourceHandle<Texture>(texture));
+    return material;
+}
+
+const char* GetScreenshotFilename(RHIType backendType) {
+    switch (backendType) {
+        case RHIType::D3D12:
+            return kD3D12Screenshot;
+        case RHIType::Vulkan:
+            return kVulkanScreenshot;
+        case RHIType::OpenGL:
+        default:
+            return kOpenGLScreenshot;
+    }
+}
+
+int GetComparisonThreshold(RHIType backendType) {
+    return backendType == RHIType::D3D12 ? 0 : 5;
+}
+
+class UnlitSceneTest : public RHIIntegrationFixture {
+protected:
+    void SetUp() override;
+    void TearDown() override;
+    void RenderFrame() override;
+
+private:
+    RHIResourceView* GetCurrentBackBufferView();
+
+    std::unique_ptr<Scene> mScene;
+    std::unique_ptr<SceneRenderer> mSceneRenderer;
+    std::vector<RHIResourceView*> mBackBufferViews;
+    RHITexture* mDepthTexture = nullptr;
+    RHIResourceView* mDepthView = nullptr;
+    Mesh* mMesh = nullptr;
+    Material* mMaterial = nullptr;
+    Texture* mTexture = nullptr;
+};
+
+void UnlitSceneTest::SetUp() {
+    RHIIntegrationFixture::SetUp();
+
+    mSceneRenderer = std::make_unique<SceneRenderer>();
+    mScene = std::make_unique<Scene>("UnlitScene");
+
+    mMesh = CreateQuadMesh();
+    mTexture = CreateCheckerTexture();
+    mMaterial = CreateMaterial(mTexture);
+
+    GameObject* cameraObject = mScene->CreateGameObject("MainCamera");
+    auto* camera = cameraObject->AddComponent<CameraComponent>();
+    camera->SetPrimary(true);
+    camera->SetClearColor(XCEngine::Math::Color(0.08f, 0.08f, 0.10f, 1.0f));
+
+    GameObject* quadObject = mScene->CreateGameObject("Quad");
+    quadObject->GetTransform()->SetLocalPosition(Vector3(0.0f, 0.0f, 3.0f));
+    auto* meshFilter = quadObject->AddComponent<MeshFilterComponent>();
+    auto* meshRenderer = quadObject->AddComponent<MeshRendererComponent>();
+    meshFilter->SetMesh(ResourceHandle<Mesh>(mMesh));
+    meshRenderer->SetMaterial(0, ResourceHandle<Material>(mMaterial));
+
+    TextureDesc depthDesc = {};
+    depthDesc.width = kFrameWidth;
+    depthDesc.height = kFrameHeight;
+    depthDesc.depth = 1;
+    depthDesc.mipLevels = 1;
+    depthDesc.arraySize = 1;
+    depthDesc.format = static_cast<uint32_t>(Format::D24_UNorm_S8_UInt);
+    depthDesc.textureType = static_cast<uint32_t>(XCEngine::RHI::TextureType::Texture2D);
+    depthDesc.sampleCount = 1;
+    depthDesc.sampleQuality = 0;
+    depthDesc.flags = 0;
+    mDepthTexture = GetDevice()->CreateTexture(depthDesc);
+    ASSERT_NE(mDepthTexture, nullptr);
+
+    ResourceViewDesc depthViewDesc = {};
+    depthViewDesc.format = static_cast<uint32_t>(Format::D24_UNorm_S8_UInt);
+    depthViewDesc.dimension = ResourceViewDimension::Texture2D;
+    depthViewDesc.mipLevel = 0;
+    mDepthView = GetDevice()->CreateDepthStencilView(mDepthTexture, depthViewDesc);
+    ASSERT_NE(mDepthView, nullptr);
+
+    mBackBufferViews.resize(2, nullptr);
+}
+
+void UnlitSceneTest::TearDown() {
+    mSceneRenderer.reset();
+
+    if (mDepthView != nullptr) {
+        mDepthView->Shutdown();
+        delete mDepthView;
+        mDepthView = nullptr;
+    }
+
+    if (mDepthTexture != nullptr) {
+        mDepthTexture->Shutdown();
+        delete mDepthTexture;
+        mDepthTexture = nullptr;
+    }
+
+    for (RHIResourceView*& backBufferView : mBackBufferViews) {
+        if (backBufferView != nullptr) {
+            backBufferView->Shutdown();
+            delete backBufferView;
+            backBufferView = nullptr;
+        }
+    }
+    mBackBufferViews.clear();
+
+    mScene.reset();
+
+    delete mMaterial;
+    mMaterial = nullptr;
+    delete mMesh;
+    mMesh = nullptr;
+    delete mTexture;
+    mTexture = nullptr;
+
+    RHIIntegrationFixture::TearDown();
+}
+
+RHIResourceView* UnlitSceneTest::GetCurrentBackBufferView() {
+    const int backBufferIndex = GetCurrentBackBufferIndex();
+    if (backBufferIndex < 0) {
+        return nullptr;
+    }
+
+    if (static_cast<size_t>(backBufferIndex) >= mBackBufferViews.size()) {
+        mBackBufferViews.resize(static_cast<size_t>(backBufferIndex) + 1, nullptr);
+    }
+
+    if (mBackBufferViews[backBufferIndex] == nullptr) {
+        ResourceViewDesc viewDesc = {};
+        viewDesc.format = static_cast<uint32_t>(Format::R8G8B8A8_UNorm);
+        viewDesc.dimension = ResourceViewDimension::Texture2D;
+        viewDesc.mipLevel = 0;
+        mBackBufferViews[backBufferIndex] = GetDevice()->CreateRenderTargetView(GetCurrentBackBuffer(), viewDesc);
+    }
+
+    return mBackBufferViews[backBufferIndex];
+}
+
+void UnlitSceneTest::RenderFrame() {
+    ASSERT_NE(mScene, nullptr);
+    ASSERT_NE(mSceneRenderer, nullptr);
+
+    RHICommandList* commandList = GetCommandList();
+    ASSERT_NE(commandList, nullptr);
+
+    commandList->Reset();
+
+    RenderSurface surface(kFrameWidth, kFrameHeight);
+    surface.SetColorAttachment(GetCurrentBackBufferView());
+    surface.SetDepthAttachment(mDepthView);
+
+    RenderContext renderContext = {};
+    renderContext.device = GetDevice();
+    renderContext.commandList = commandList;
+    renderContext.commandQueue = GetCommandQueue();
+    renderContext.backendType = GetBackendType();
+
+    ASSERT_TRUE(mSceneRenderer->Render(*mScene, nullptr, renderContext, surface));
+
+    commandList->Close();
+    void* commandLists[] = { commandList };
+    GetCommandQueue()->ExecuteCommandLists(1, commandLists);
+}
+
+TEST_P(UnlitSceneTest, RenderUnlitScene) {
+    RHICommandQueue* commandQueue = GetCommandQueue();
+    RHISwapChain* swapChain = GetSwapChain();
+    const int targetFrameCount = 30;
+    const char* screenshotFilename = GetScreenshotFilename(GetBackendType());
+    const int comparisonThreshold = GetComparisonThreshold(GetBackendType());
+
+    for (int frameCount = 0; frameCount <= targetFrameCount; ++frameCount) {
+        if (frameCount > 0) {
+            commandQueue->WaitForPreviousFrame();
+        }
+
+        BeginRender();
+        RenderFrame();
+
+        if (frameCount >= targetFrameCount) {
+            commandQueue->WaitForIdle();
+            ASSERT_TRUE(TakeScreenshot(screenshotFilename));
+            ASSERT_TRUE(CompareWithGoldenTemplate(screenshotFilename, "GT.ppm", static_cast<float>(comparisonThreshold)));
+            break;
+        }
+
+        swapChain->Present(0, 0);
+    }
+}
+
+} // namespace
+
+INSTANTIATE_TEST_SUITE_P(D3D12, UnlitSceneTest, ::testing::Values(RHIType::D3D12));
+INSTANTIATE_TEST_SUITE_P(OpenGL, UnlitSceneTest, ::testing::Values(RHIType::OpenGL));
+#if defined(XCENGINE_SUPPORT_VULKAN)
+INSTANTIATE_TEST_SUITE_P(Vulkan, UnlitSceneTest, ::testing::Values(RHIType::Vulkan));
+#endif
+
+GTEST_API_ int main(int argc, char** argv) {
+    return RunRenderingIntegrationTestMain(argc, argv);
+}