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#ifndef LAYER_CONTEXT_HH_
#define LAYER_CONTEXT_HH_
#include <mutex>
#include <unordered_map>
#include <vulkan/vulkan_core.h>
#include "context.hh"
#include "device_context.hh"
#include "instance_context.hh"
#include "physical_device_context.hh"
#include "queue_context.hh"
// The purpose of this file is to provide a definition for the highest level
// entry point struct of our vulkan state.
namespace low_latency {
// All these templates do is make it so we can go from some DispatchableType
// to their respective context's with nice syntax. This lets us write something
// like this for all DispatchableTypes:
//
// const auto device_context = get_context(some_vk_device);
// ^ It was automatically deduced as DeviceContext, wow!
template <typename T>
concept DispatchableType =
std::same_as<std::remove_cvref_t<T>, VkInstance> ||
std::same_as<std::remove_cvref_t<T>, VkPhysicalDevice> ||
std::same_as<std::remove_cvref_t<T>, VkDevice> ||
std::same_as<std::remove_cvref_t<T>, VkQueue>;
template <class D> struct context_for_t;
template <> struct context_for_t<VkInstance> {
using context = InstanceContext;
};
template <> struct context_for_t<VkPhysicalDevice> {
using context = PhysicalDeviceContext;
};
template <> struct context_for_t<VkDevice> {
using context = DeviceContext;
};
template <> struct context_for_t<VkQueue> {
using context = QueueContext;
};
template <DispatchableType D>
using dispatch_context_t = typename context_for_t<D>::context;
class LayerContext final : public Context {
private:
// If this is not null and set to exactly 1, then we should sleep after
// present.
static constexpr auto SLEEP_AFTER_PRESENT_ENV =
"LOW_LATENCY_LAYER_SLEEP_AFTER_PRESENT";
// If this is not null and set to exactly 1, then VK_NV_low_latency2
// should be provided instead of VK_AMD_anti_lag.
static constexpr auto SPOOF_NVIDIA_ENV =
"LOW_LATENCY_LAYER_SPOOF_NVIDIA";
public:
std::mutex mutex;
std::unordered_map<void*, std::shared_ptr<Context>> contexts;
bool is_antilag_1_enabled = false;
bool should_spoof_nvidia = false;
public:
LayerContext();
virtual ~LayerContext();
public:
template <DispatchableType DT> static void* get_key(const DT& dt) {
return reinterpret_cast<void*>(dt);
}
template <DispatchableType DT>
std::shared_ptr<dispatch_context_t<DT>> get_context(const DT& dt) {
const auto key = get_key(dt);
const auto lock = std::scoped_lock(this->mutex);
const auto it = this->contexts.find(key);
assert(it != std::end(this->contexts));
using context_t = dispatch_context_t<DT>;
const auto ptr = std::dynamic_pointer_cast<context_t>(it->second);
assert(ptr);
return ptr;
}
};
}; // namespace low_latency
#endif
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