Use rotation for background gradient; fix timing

Update fragment shader to use ubo.rotation instead of ubo.time and sync
the SPIR-V. Add periodic debug output in VulkanRenderer. Track total
paused time in VulkanWidget (m_totalPausedTime) and subtract it from
elapsed time so animations remain in sync after lock/unlock.

shaders/background.frag

@@ -28,8 +28,8 @@ void main() {
     // Normalize position to 0-1 range
     vec2 uv = (fragPosition + 1.0) * 0.5;
 
-    // Create dynamic gradient based on time
-    float t = ubo.time / 360.0;
+    // Create dynamic gradient based on rotation angle (matching Qt CustomWidget)
+    float t = ubo.rotation / 360.0;
 
     // Calculate color components matching Qt CustomWidget
     float r = 0.392 + 0.196 * sin(t * 6.28318);

src/shaders_spirv/background_frag.inc

@@ -36,7 +36,7 @@
     0x3f800000u, 0x0007002cu, 0x00000014u, 0x00000019u, 0x00000017u, 0x00000017u, 0x00000017u, 0x00000018u,
     0x00040017u, 0x0000001bu, 0x00000006u, 0x00000002u, 0x00040020u, 0x0000001cu, 0x00000007u, 0x0000001bu,
     0x00040020u, 0x0000001eu, 0x00000001u, 0x0000001bu, 0x0004003bu, 0x0000001eu, 0x0000001fu, 0x00000001u,
-    0x00040020u, 0x00000024u, 0x00000007u, 0x00000006u, 0x0004002bu, 0x0000000au, 0x00000026u, 0x00000000u,
+    0x00040020u, 0x00000024u, 0x00000007u, 0x00000006u, 0x0004002bu, 0x0000000au, 0x00000026u, 0x00000003u,
     0x0004002bu, 0x00000006u, 0x00000029u, 0x43b40000u, 0x0004002bu, 0x00000006u, 0x0000002cu, 0x3ec8b439u,
     0x0004002bu, 0x00000006u, 0x0000002du, 0x3e48b439u, 0x0004002bu, 0x00000006u, 0x0000002fu, 0x40c90fd0u,
     0x0004002bu, 0x00000006u, 0x00000035u, 0x3f16872bu, 0x0004002bu, 0x00000006u, 0x00000038u, 0x3f860419u,

src/vulkanrenderer.cpp

@@ -562,6 +562,15 @@ void VulkanRenderer::recordCommandBuffer(VkCommandBuffer commandBuffer,
     m_ubo.wavePhase = static_cast<float>(wavePhase);
     m_ubo.paintingEnabled = paintingEnabled ? 1.0f : 0.0f;
 
+    // Debug output every 60 frames
+    static int debugCounter = 0;
+    if (++debugCounter % 60 == 0) {
+        std::cout << "Background animation - time: " << m_ubo.time 
+                  << ", rotation: " << m_ubo.rotation 
+                  << ", wavePhase: " << m_ubo.wavePhase 
+                  << ", paintingEnabled: " << m_ubo.paintingEnabled << std::endl;
+    }
+
 
 
     // CRITICAL FIX: Update ALL uniform buffers every frame!

src/vulkanwidget.cpp

@@ -60,6 +60,7 @@ VulkanWidget::VulkanWidget(QWidget *parent)
     , m_wavePhase(0.0)
     , m_startTime(QDateTime::currentDateTime())
     , m_lastLockDuration(0)
+    , m_totalPausedTime(0)
     , m_lastLockFrameCount(0)
     , m_lockPaintFrameCount(0)
     , m_lockCount(0)
@@ -134,17 +135,20 @@ void VulkanWidget::setRenderingEnabled(bool enabled)
             qDebug() << "Render timer restarted";
         }
 
-        // Unlocked: calculate lock duration
+        // Unlocked: calculate lock duration and accumulate paused time
         if (m_lastLockTime.isValid()) {
             QDateTime unlockTime = QDateTime::currentDateTime();
             m_lastLockDuration = m_lastLockTime.secsTo(unlockTime);
             m_lockPaintFrameCount = m_frameCount - m_lastLockFrameCount;
+            
+            // 累积锁屏期间的暂停时间
+            m_totalPausedTime += m_lastLockDuration;
+            
             qDebug() << "Screen was locked for" << m_lastLockDuration << "seconds";
+            qDebug() << "Total paused time:" << m_totalPausedTime << "seconds";
             qDebug() << "Frames at lock:" << m_lastLockFrameCount
                      << "- Frames painted during lock:" << m_lockPaintFrameCount;
         }
-
-        m_startTime = QDateTime::currentDateTime();
     } else {
         qDebug() << "Vulkan rendering DISABLED - Showing locked state";
         // 关键修复：渲染一帧锁屏界面后停止定时器
@@ -980,9 +984,10 @@ void VulkanWidget::recordCommandBuffer(VkCommandBuffer commandBuffer, uint32_t i
                 .arg(m_lockCount);
         }
 
-        // Calculate elapsed time in seconds
+        // Calculate elapsed time in seconds (total runtime minus paused time)
         QDateTime now = QDateTime::currentDateTime();
-        qint64 elapsedTime = m_startTime.secsTo(now);
+        qint64 totalRuntime = m_startTime.secsTo(now);
+        qint64 elapsedTime = totalRuntime - m_totalPausedTime;
 
         m_renderer->recordCommandBuffer(commandBuffer, imageIndex, imageView,
                                         m_frameCount, static_cast<double>(elapsedTime),

src/vulkanwidget.h

@@ -254,6 +254,7 @@ private:
     QDateTime m_pauseTime;
     QDateTime m_lastLockTime;
     qint64 m_lastLockDuration;
+    qint64 m_totalPausedTime;  // 累积的暂停时间（秒）
     int m_lastLockFrameCount;
     int m_lockPaintFrameCount;
     int m_lockCount;