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shader: read S_MEMREALTIME from the host device clock shifted to about 100 MHz

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This commit is contained in:
Senaxx
2026-10-23 14:02:16 +02:00
committed by nmzik
parent 1ffaaa96b1
commit 77a8f30758
10 changed files with 104 additions and 30 deletions
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src/graphics/presentation/window/vulkanWindow.cpp
+18
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@@ -24,6 +24,7 @@
#include <SDL3/SDL.h>
#include <SDL3/SDL_vulkan.h>
#include <algorithm>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <fmt/format.h>
@@ -506,6 +507,13 @@ static vk::Device VulkanCreateDevice(GraphicContext& graphics,
maintenance8.pNext = supported_features2.pNext;
supported_features2.pNext = &maintenance8;
}
const bool shader_clock_extension =
HasExtension(device_extensions, VK_KHR_SHADER_CLOCK_EXTENSION_NAME);
vk::PhysicalDeviceShaderClockFeaturesKHR shader_clock {};
if (shader_clock_extension) {
shader_clock.pNext = supported_features2.pNext;
supported_features2.pNext = &shader_clock;
}
const bool image_atomic_int64_extension =
HasExtension(device_extensions, VK_EXT_SHADER_IMAGE_ATOMIC_INT64_EXTENSION_NAME);
vk::PhysicalDeviceShaderImageAtomicInt64FeaturesEXT image_atomic_int64 {};
@@ -593,6 +601,11 @@ static vk::Device VulkanCreateDevice(GraphicContext& graphics,
feedback_extensions && feedback_layout.attachmentFeedbackLoopLayout &&
feedback_dynamic.attachmentFeedbackLoopDynamicState;
graphics.maintenance8_enabled = maintenance8_extension && maintenance8.maintenance8;
// The device clock ticks at timestampPeriod nanoseconds.
if (shader_clock_extension && shader_clock.shaderDeviceClock) {
graphics.device_clock_period_ps = static_cast<uint32_t>(
std::lround(graphics.physical_device_properties.limits.timestampPeriod * 1000.0f));
}
graphics.conditional_rendering_enabled =
conditional_rendering_extension && conditional_rendering.conditionalRendering;
LOGF("Vulkan maintenance8 support: %s\n",
@@ -702,6 +715,10 @@ static vk::Device VulkanCreateDevice(GraphicContext& graphics,
maintenance8.pNext = const_cast<void*>(create_info.pNext);
create_info.pNext = &maintenance8;
}
if (graphics.device_clock_period_ps != 0u) {
shader_clock.pNext = const_cast<void*>(create_info.pNext);
create_info.pNext = &shader_clock;
}
if (graphics.conditional_rendering_enabled) {
conditional_rendering.pNext = const_cast<void*>(create_info.pNext);
create_info.pNext = &conditional_rendering;
@@ -1077,6 +1094,7 @@ void WindowContext::CreateVulkan() {
graphic_ctx.memory_budget_ext_enabled = true;
}
for (const auto* extension: {VK_KHR_MAINTENANCE_8_EXTENSION_NAME,
VK_KHR_SHADER_CLOCK_EXTENSION_NAME,
VK_EXT_SHADER_IMAGE_ATOMIC_INT64_EXTENSION_NAME,
VK_EXT_PROVOKING_VERTEX_EXTENSION_NAME,
VK_EXT_MESH_SHADER_EXTENSION_NAME,