From 0d9bd79e8fd4d57e1a723ca6b6a45efec2b42872 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Thu, 10 Jun 2021 00:30:19 -0700
Subject: Support timestamp queries in `gfx`. (#1880)

* Support timestamp queries in `gfx`.

* Fix tab

Co-authored-by: Yong He <yhe@nvidia.com>
---
 tools/gfx/cpu/render-cpu.cpp | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

(limited to 'tools/gfx/cpu/render-cpu.cpp')

diff --git a/tools/gfx/cpu/render-cpu.cpp b/tools/gfx/cpu/render-cpu.cpp
index 03628c166..ac8b612fb 100644
--- a/tools/gfx/cpu/render-cpu.cpp
+++ b/tools/gfx/cpu/render-cpu.cpp
@@ -1,6 +1,8 @@
 // render-cpu.cpp
 #include "render-cpu.h"
 
+#include <chrono>
+
 #include "slang.h"
 #include "slang-com-ptr.h"
 #include "slang-com-helper.h"
@@ -999,6 +1001,34 @@ public:
     }
 };
 
+class CPUQueryPool : public IQueryPool, public ComObject
+{
+public:
+    SLANG_COM_OBJECT_IUNKNOWN_ALL;
+    IQueryPool* getInterface(const Guid& guid)
+    {
+        if (guid == GfxGUID::IID_ISlangUnknown || guid == GfxGUID::IID_IQueryPool)
+            return static_cast<IQueryPool*>(this);
+        return nullptr;
+    }
+public:
+    List<uint64_t> m_queries;
+    Result init(const IQueryPool::Desc& desc)
+    {
+        m_queries.setCount(desc.count);
+        return SLANG_OK;
+    }
+    virtual SLANG_NO_THROW Result SLANG_MCALL getResult(
+        SlangInt queryIndex, SlangInt count, uint64_t* data) override
+    {
+        for (SlangInt i = 0; i < count; i++)
+        {
+            data[i] = m_queries[queryIndex + i];
+        }
+        return SLANG_OK;
+    }
+};
+
 class CPUDevice : public ImmediateComputeDeviceBase
 {
 private:
@@ -1225,6 +1255,20 @@ public:
         return Result();
     }
 
+    virtual SLANG_NO_THROW Result SLANG_MCALL createQueryPool(
+        const IQueryPool::Desc& desc, IQueryPool** outPool) override
+    {
+        RefPtr<CPUQueryPool> pool = new CPUQueryPool();
+        returnComPtr(outPool, pool);
+        return SLANG_OK;
+    }
+
+    virtual void writeTimestamp(IQueryPool* pool, SlangInt index) override
+    {
+        static_cast<CPUQueryPool*>(pool)->m_queries[index] =
+            std::chrono::high_resolution_clock::now().time_since_epoch().count();
+    }
+
     virtual SLANG_NO_THROW const DeviceInfo& SLANG_MCALL getDeviceInfo() const override
     {
         return m_info;
-- 
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