Add XCUI ImGui transition backend MVP

2026-04-04 19:22:10 +08:00
parent 0c23509e1a
commit 75ded6f630
10 changed files with 754 additions and 0 deletions
--- a/tests/editor/test_xcui_imgui_transition_backend.cpp
+++ b/tests/editor/test_xcui_imgui_transition_backend.cpp
@@ -0,0 +1,97 @@
+#include <gtest/gtest.h>
+
+#include "XCUIBackend/ImGuiTransitionBackend.h"
+
+#include <XCEngine/UI/DrawData.h>
+
+#include <imgui.h>
+
+namespace {
+
+class ImGuiContextScope {
+public:
+    ImGuiContextScope() {
+        IMGUI_CHECKVERSION();
+        ImGui::CreateContext();
+    }
+
+    ~ImGuiContextScope() {
+        ImGui::DestroyContext();
+    }
+};
+
+} // namespace
+
+TEST(XCUIImGuiTransitionBackendTest, BeginFrameResetsPendingState) {
+    ImGuiContextScope contextScope;
+
+    XCEngine::Editor::XCUIBackend::ImGuiTransitionBackend backend = {};
+    XCEngine::UI::UIDrawList drawList("Pending");
+    drawList.AddFilledRect(
+        XCEngine::UI::UIRect(0.0f, 0.0f, 16.0f, 16.0f),
+        XCEngine::UI::UIColor(1.0f, 0.0f, 0.0f, 1.0f));
+
+    backend.BeginFrame();
+    backend.Submit(drawList);
+    ASSERT_EQ(backend.GetPendingDrawListCount(), 1u);
+    ASSERT_EQ(backend.GetPendingCommandCount(), 1u);
+
+    backend.BeginFrame();
+    EXPECT_EQ(backend.GetPendingDrawListCount(), 0u);
+    EXPECT_EQ(backend.GetPendingCommandCount(), 0u);
+}
+
+TEST(XCUIImGuiTransitionBackendTest, EndFrameFlushesCommandsToImGuiDrawList) {
+    ImGuiContextScope contextScope;
+    ImGuiIO& io = ImGui::GetIO();
+    io.DisplaySize = ImVec2(1280.0f, 720.0f);
+    io.DeltaTime = 1.0f / 60.0f;
+    unsigned char* fontPixels = nullptr;
+    int fontWidth = 0;
+    int fontHeight = 0;
+    io.Fonts->GetTexDataAsRGBA32(&fontPixels, &fontWidth, &fontHeight);
+    io.Fonts->SetTexID(static_cast<ImTextureID>(1));
+
+    XCEngine::Editor::XCUIBackend::ImGuiTransitionBackend backend = {};
+    XCEngine::UI::UIDrawList drawList("FlushTest");
+    drawList.PushClipRect(XCEngine::UI::UIRect(0.0f, 0.0f, 220.0f, 160.0f));
+    drawList.AddFilledRect(
+        XCEngine::UI::UIRect(10.0f, 10.0f, 60.0f, 40.0f),
+        XCEngine::UI::UIColor(0.1f, 0.2f, 0.3f, 1.0f),
+        4.0f);
+    drawList.AddRectOutline(
+        XCEngine::UI::UIRect(10.0f, 10.0f, 60.0f, 40.0f),
+        XCEngine::UI::UIColor(0.9f, 0.9f, 0.9f, 1.0f),
+        2.0f,
+        4.0f);
+    drawList.AddText(
+        XCEngine::UI::UIPoint(18.0f, 26.0f),
+        "Backend",
+        XCEngine::UI::UIColor(1.0f, 1.0f, 1.0f, 1.0f),
+        16.0f);
+    drawList.AddImage(
+        XCEngine::UI::UIRect(90.0f, 12.0f, 32.0f, 32.0f),
+        XCEngine::UI::UITextureHandle{ 0x100u, 32u, 32u },
+        XCEngine::UI::UIColor(1.0f, 1.0f, 1.0f, 1.0f));
+    drawList.PopClipRect();
+
+    backend.BeginFrame();
+    backend.Submit(drawList);
+
+    ImGui::NewFrame();
+    ASSERT_TRUE(ImGui::Begin("XCUIBackendTest"));
+    ImDrawList* targetDrawList = ImGui::GetWindowDrawList();
+    ASSERT_NE(targetDrawList, nullptr);
+
+    const bool flushed = backend.EndFrame(targetDrawList);
+
+    ImGui::End();
+    ImGui::EndFrame();
+
+    EXPECT_TRUE(flushed);
+    EXPECT_EQ(backend.GetLastFlushedDrawListCount(), 1u);
+    EXPECT_EQ(backend.GetLastFlushedCommandCount(), 6u);
+    EXPECT_EQ(backend.GetPendingCommandCount(), 0u);
+    EXPECT_GT(targetDrawList->VtxBuffer.Size, 0);
+    EXPECT_GT(targetDrawList->CmdBuffer.Size, 0);
+}