yuzu/src/video_core/guest_driver.h

// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include <optional>
#include <vector>

#include "common/common_types.h"

namespace VideoCore {

/**
 * The GuestDriverProfile class is used to learn about the GPU drivers behavior and collect
 * information necessary for impossible to avoid HLE methods like shader tracks as they are
 * Entscheidungsproblems.
 */
class GuestDriverProfile {
public:
    explicit GuestDriverProfile() = default;
    explicit GuestDriverProfile(std::optional<u32> texture_handler_size)
        : texture_handler_size{texture_handler_size} {}

    void DeduceTextureHandlerSize(std::vector<u32> bound_offsets);

    u32 GetTextureHandlerSize() const {
        return texture_handler_size.value_or(default_texture_handler_size);
    }

    bool IsTextureHandlerSizeKnown() const {
        return texture_handler_size.has_value();
    }

private:
    // Minimum size of texture handler any driver can use.
    static constexpr u32 min_texture_handler_size = 4;

    // This goes with Vulkan and OpenGL standards but Nvidia GPUs can easily use 4 bytes instead.
    // Thus, certain drivers may squish the size.
    static constexpr u32 default_texture_handler_size = 8;

    std::optional<u32> texture_handler_size = default_texture_handler_size;
};

} // namespace VideoCore