Preliminary support for realtime clock (#2772)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Initial support for realtime clock.

* Add realtime-clock render feature where seems appropriate.

* Fixes to make NVAPI compile properly.
Change realtime-clock.slang check to use maths that can't overflow.

1 files changed, 14 insertions, 0 deletions

diff --git a/tools/gfx/vulkan/vk-device.cpp b/tools/gfx/vulkan/vk-device.cpp
index b5eec0b72..488f39be6 100644
--- a/tools/gfx/vulkan/vk-device.cpp
+++ b/tools/gfx/vulkan/vk-device.cpp
@@ -424,6 +424,10 @@ Result DeviceImpl::initVulkanInstanceAndDevice(
         extendedFeatures.robustness2Features.pNext = deviceFeatures2.pNext;
         deviceFeatures2.pNext = &extendedFeatures.robustness2Features;
 
+        // clock features
+        extendedFeatures.clockFeatures.pNext = deviceFeatures2.pNext;
+        deviceFeatures2.pNext = &extendedFeatures.clockFeatures;
+
         // Atomic Float
         // To detect atomic float we need
         // https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/VkPhysicalDeviceShaderAtomicFloatFeaturesEXT.html
@@ -575,6 +579,16 @@ Result DeviceImpl::initVulkanInstanceAndDevice(
             m_features.add("robustness2");
         }
 
+        if (extendedFeatures.clockFeatures.shaderDeviceClock)
+        {
+            deviceExtensions.add(VK_KHR_SHADER_CLOCK_EXTENSION_NAME);
+
+            extendedFeatures.clockFeatures.pNext = (void*)deviceCreateInfo.pNext;
+            deviceCreateInfo.pNext = &extendedFeatures.clockFeatures;
+
+            m_features.add("realtime-clock");
+        }
+
         VkPhysicalDeviceProperties2 extendedProps = {
             VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PROPERTIES_2 };
         VkPhysicalDeviceRayTracingPipelinePropertiesKHR rtProps = {