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#ifndef LAYER_CONTEXT_HH_
#define LAYER_CONTEXT_HH_
#include <mutex>
#include <variant>
#include "device_context.hh"
#include "instance_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.
//
// All Context structs have deleted copy/move constructors. This is because we
// want to be extremely explicit with how/when we delete things, and this allows
// us to use destructors for cleanup without much worry about weird copies
// floating around. Most contexts will probably live inside std::unique_ptr's as
// a result so they can be used in standard containers.
namespace low_latency {
template <typename T>
concept DispatchableType =
std::same_as<std::remove_cvref_t<T>, VkInstance> ||
std::same_as<std::remove_cvref_t<T>, VkDevice> ||
std::same_as<std::remove_cvref_t<T>, VkPhysicalDevice> ||
std::same_as<std::remove_cvref_t<T>, VkQueue>;
struct LayerContext {
public:
using ContextVariant = std::variant<std::unique_ptr<DeviceContext>,
std::unique_ptr<InstanceContext>>;
public:
std::mutex mutex;
std::unordered_map<void*, ContextVariant> contexts;
std::uint64_t current_frame = 0;
public:
LayerContext();
LayerContext(const LayerContext&) = delete;
LayerContext(LayerContext&&) = delete;
LayerContext operator==(const LayerContext&) = delete;
LayerContext operator==(LayerContext&&) = delete;
~LayerContext();
public:
template <DispatchableType T> static void* get_key(const T& dt) {
return *reinterpret_cast<void**>(dt);
}
template <typename T, DispatchableType DispatchableType>
requires(!std::same_as<T, QueueContext>)
T& get_context(const DispatchableType& dt) {
const auto key = get_key(dt);
const auto it = this->contexts.find(key);
assert(it != std::end(this->contexts));
const auto ptr = std::get_if<std::unique_ptr<T>>(&it->second);
assert(ptr && *ptr);
return **ptr;
}
// QueueContext's are actually owned by a device so look there instead.
template <typename T, DispatchableType DispatchableType>
requires(std::same_as<T, QueueContext>)
T& get_context(const DispatchableType& dt) {
const auto& device_context = this->get_context<DeviceContext>(dt);
const auto& queue_context = device_context.queue_contexts;
const auto it = device_context.queue_contexts.find(dt);
assert(it != std::end(queue_context));
const auto& ptr = it->second;
return *ptr;
}
};
}; // namespace low_latency
#endif
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