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Code Issues 144 Wiki Activity

Add DLSS Frame Generation (gfx.framegeneration x2/x3/x4) and Reflex (gfx.reflex) to the Vulkan renderer

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Hirek
2026-10-25 20:52:12 +01:00
parent 1841e6d7b0
commit a6bdeeaa2b
23 changed files with 1474 additions and 85 deletions
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44
rendering/vulkan14/vulkan14device.cpp
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@@ -325,6 +325,40 @@ bool device::create(instance const &Instance, std::string &Reason, std::vector<s
}
}
// reflex (gfx.reflex, and with the frame generation of dlss, which takes it for granted): the sleep of the driver before the
// simulation of a frame and the markers of the frame, with the ids of the presents the markers are for
VkPhysicalDevicePresentIdFeaturesKHR presentid{};
presentid.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PRESENT_ID_FEATURES_KHR;
m_low_latency = false;
if ((Global.gfx_reflex > 0) || (Global.gfx_framegeneration > 1))
{
std::uint32_t count{0};
vkEnumerateDeviceExtensionProperties(m_physical, nullptr, &count, nullptr);
std::vector<VkExtensionProperties> available(count);
vkEnumerateDeviceExtensionProperties(m_physical, nullptr, &count, available.data());
auto const has = [&](char const *Name) { return std::any_of(available.begin(), available.end(), [Name](VkExtensionProperties const &Entry) { return std::strcmp(Entry.extensionName, Name) == 0; }); };
VkPhysicalDeviceFeatures2 features{};
features.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FEATURES_2;
features.pNext = &presentid;
vkGetPhysicalDeviceFeatures2(m_physical, &features);
presentid.pNext = nullptr;
m_low_latency = has(VK_NV_LOW_LATENCY_2_EXTENSION_NAME) && has(VK_KHR_PRESENT_ID_EXTENSION_NAME) && (presentid.presentId == VK_TRUE);
if (m_low_latency)
{
for (auto const *name : {VK_NV_LOW_LATENCY_2_EXTENSION_NAME, VK_KHR_PRESENT_ID_EXTENSION_NAME})
{
if (std::none_of(extensions.begin(), extensions.end(), [name](char const *Entry) { return std::strcmp(Entry, name) == 0; }))
{
extensions.push_back(name);
}
}
}
else
{
log_info("gfx.reflex: " + m_capabilities.device_name + " has no VK_NV_low_latency2 with VK_KHR_present_id, reflex stays off");
}
}
// the ray traced reflections, asked for in eu07.ini (gfx.raytracing), where the device has what they need
VkPhysicalDeviceAccelerationStructureFeaturesKHR acceleration{};
acceleration.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_ACCELERATION_STRUCTURE_FEATURES_KHR;
@@ -354,6 +388,12 @@ bool device::create(instance const &Instance, std::string &Reason, std::vector<s
VkDeviceCreateInfo create{};
create.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO;
create.pNext = enabled.head();
if (m_low_latency)
{
presentid.presentId = VK_TRUE;
presentid.pNext = const_cast<void *>(create.pNext);
create.pNext = &presentid;
}
create.queueCreateInfoCount = static_cast<std::uint32_t>(queues.size());
create.pQueueCreateInfos = queues.data();
create.enabledExtensionCount = static_cast<std::uint32_t>(extensions.size());
@@ -382,6 +422,10 @@ bool device::create(instance const &Instance, std::string &Reason, std::vector<s
{
log_info("ray queries on, for the ray traced reflections (gfx.raytracing)");
}
if (m_low_latency)
{
log_info("VK_NV_low_latency2 on, for reflex (gfx.reflex)");
}
return true;
}