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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
#include <algorithm>
#include "common/alignment.h"
#include "common/assert.h"
#include "common/logging.h"
#include "video_core/renderer_vulkan/vk_descriptor_buffer.h"
#include "video_core/renderer_vulkan/vk_scheduler.h"
#include "video_core/vulkan_common/vulkan_device.h"
namespace Vulkan {
DescriptorBufferRing::DescriptorBufferRing(const Device& device_,
MemoryAllocator& memory_allocator)
: device{device_} {
if (!device.IsExtDescriptorBufferSupported() || !device.IsBufferDeviceAddressSupported()) {
return;
}
const VkPhysicalDeviceDescriptorBufferPropertiesEXT& props{device.DescriptorBufferProperties()};
alignment = std::max<VkDeviceSize>(props.descriptorBufferOffsetAlignment, 1);
const VkDeviceSize max_bound{(std::min)({props.maxSamplerDescriptorBufferRange,
props.maxResourceDescriptorBufferRange,
props.samplerDescriptorBufferAddressSpaceSize,
props.resourceDescriptorBufferAddressSpaceSize,
props.descriptorBufferAddressSpaceSize})};
const VkDeviceSize frame_size{device.IsTiler() ? TILER_FRAME_SIZE : DESKTOP_FRAME_SIZE};
const VkDeviceSize chunk_size{
Common::AlignDown((std::min)(frame_size, max_bound), alignment)};
if (chunk_size <= alignment) {
LOG_DEBUG(Render_Vulkan, "Descriptor buffer binding limit of {} is unusable, disabling",
max_bound);
return;
}
chunk_capacity = chunk_size - alignment;
chunks_per_frame = static_cast<size_t>(frame_size / chunk_size);
const VkBufferCreateInfo buffer_ci{
.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
.pNext = nullptr,
.flags = 0,
.size = chunk_size,
.usage = VK_BUFFER_USAGE_RESOURCE_DESCRIPTOR_BUFFER_BIT_EXT |
VK_BUFFER_USAGE_SAMPLER_DESCRIPTOR_BUFFER_BIT_EXT |
VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT,
.sharingMode = VK_SHARING_MODE_EXCLUSIVE,
.queueFamilyIndexCount = 0,
.pQueueFamilyIndices = nullptr,
};
const size_t total_chunks{chunks_per_frame * FRAMES_IN_FLIGHT};
chunks.reserve(total_chunks);
chunk_addresses.reserve(total_chunks);
chunk_hosts.reserve(total_chunks);
for (size_t index = 0; index < total_chunks; ++index) {
vk::Buffer buffer{memory_allocator.CreateBuffer(buffer_ci, MemoryUsage::Upload)};
if (!buffer.IsHostVisible()) {
LOG_DEBUG(Render_Vulkan, "Descriptor buffer is not host visible, disabling");
chunks.clear();
return;
}
if (!buffer.IsHostCoherent()) {
LOG_DEBUG(Render_Vulkan, "Descriptor buffer is not host coherent, disabling");
chunks.clear();
return;
}
if (device.HasDebuggingToolAttached()) {
buffer.SetObjectNameEXT("Descriptor buffer");
}
const VkDeviceAddress raw_address{device.GetLogical().GetBufferDeviceAddress(*buffer)};
const VkDeviceAddress address{Common::AlignUp(raw_address, alignment)};
chunk_addresses.push_back(address);
chunk_hosts.push_back(buffer.Mapped().data() + (address - raw_address));
chunks.push_back(std::move(buffer));
}
}
DescriptorBufferRing::~DescriptorBufferRing() = default;
void DescriptorBufferRing::TickFrame() {
if (++frame_index >= FRAMES_IN_FLIGHT) {
frame_index = 0;
}
chunk_cursor = 0;
cursor = 0;
++generation;
frame_reused = true;
}
void DescriptorBufferRing::TouchFrame(Scheduler& scheduler) {
frame_ticks[frame_index] = scheduler.CurrentTick();
}
DescriptorBufferRing::Allocation DescriptorBufferRing::Allocate(Scheduler& scheduler,
VkDeviceSize size) {
ASSERT(!chunks.empty());
if (!CanAllocate(size)) {
LOG_DEBUG(Render_Vulkan, "Descriptor set of {} bytes exceeds chunk capacity {}", size,
chunk_capacity);
return Allocation{};
}
const VkDeviceSize needed{Common::AlignUp(size, alignment)};
if (frame_reused) {
frame_reused = false;
scheduler.Wait(frame_ticks[frame_index]);
}
if (cursor + needed > chunk_capacity) {
if (chunk_cursor + 1 < chunks_per_frame) {
++chunk_cursor;
} else {
LOG_DEBUG(Render_Vulkan, "Descriptor buffer frame exhausted, stalling on the GPU");
scheduler.Finish();
chunk_cursor = 0;
++generation;
}
cursor = 0;
}
const size_t chunk{frame_index * chunks_per_frame + chunk_cursor};
const VkDeviceSize offset{cursor};
cursor += needed;
frame_ticks[frame_index] = scheduler.CurrentTick();
return Allocation{
.host = chunk_hosts[chunk] + offset,
.offset = offset,
.chunk = static_cast<u32>(chunk),
.generation = generation,
};
}
VkDescriptorBufferBindingInfoEXT DescriptorBufferRing::BindingInfo(u32 chunk) const noexcept {
return VkDescriptorBufferBindingInfoEXT{
.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_BUFFER_BINDING_INFO_EXT,
.pNext = nullptr,
.address = chunk_addresses[chunk],
.usage = VK_BUFFER_USAGE_RESOURCE_DESCRIPTOR_BUFFER_BIT_EXT |
VK_BUFFER_USAGE_SAMPLER_DESCRIPTOR_BUFFER_BIT_EXT,
};
}
} // namespace Vulkan
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