Orange/include/Orange/Render/VulkanHelpers.h

#pragma once

#include <Orange/Core/Traits.h>
#include <Orange/Core/Result.h>
#include <vulkan/vulkan_core.h>

namespace orange
{
    template <typename Func, typename OutArray, typename... Args>
    uint32_t VkEnumerate(Func function, OutArray& outArray, Args&&... arguments)
    {
        uint32_t count = 0;
        function(arguments..., &count, nullptr);

        outArray.resize(count);
        if (!count)
            return 0;

        function(Forward<Args>(arguments)..., &count, outArray.data());
        return count;
    }

    static constexpr VkImageSubresourceRange FirstColorMipSubresourceRange =
    {
        .aspectMask     = VK_IMAGE_ASPECT_COLOR_BIT,
        .baseMipLevel   = 0,
        .levelCount     = 1,
        .baseArrayLayer = 0,
        .layerCount     = 1,
    };

    static constexpr VkImageSubresourceRange FirstDepthMipSubresourceRange =
    {
        .aspectMask     = VK_IMAGE_ASPECT_DEPTH_BIT | VK_IMAGE_ASPECT_STENCIL_BIT,
        .baseMipLevel   = 0,
        .levelCount     = 1,
        .baseArrayLayer = 0,
        .layerCount     = 1,
    };

    constexpr VkFormat FormatToSrgbFormat(VkFormat format)
    {
        switch (format)
        {
            case VK_FORMAT_R8G8B8A8_UNORM:
                return VK_FORMAT_R8G8B8A8_SRGB;
            case VK_FORMAT_B8G8R8A8_UNORM:
                return VK_FORMAT_B8G8R8A8_SRGB;
            default:
                return format;
        }
    }

    template <typename... Formats>
    Result<VkFormat> FindSupportedFormat(VkPhysicalDevice physicalDevice, VkImageTiling tiling, VkFormatFeatureFlags features, Formats... formats)
    {
        for (auto& format : {formats...})
        {
            VkFormatProperties props;
            vkGetPhysicalDeviceFormatProperties(physicalDevice, format, &props);

            if (tiling == VK_IMAGE_TILING_LINEAR && (props.linearTilingFeatures & features) == features)
                return Result<VkFormat>::Success(format);

            if (tiling == VK_IMAGE_TILING_OPTIMAL && (props.optimalTilingFeatures & features) == features)
                return Result<VkFormat>::Success(format);
        }

        return Result<VkFormat>::Error(BasicErrorCode::NotFound);
    }

    inline Result<VkFormat> FindDepthFormat(VkPhysicalDevice physicalDevice)
    {
        return FindSupportedFormat(physicalDevice, VK_IMAGE_TILING_OPTIMAL, VK_FORMAT_FEATURE_DEPTH_STENCIL_ATTACHMENT_BIT,
            VK_FORMAT_D24_UNORM_S8_UINT, VK_FORMAT_D32_SFLOAT_S8_UINT, VK_FORMAT_D32_SFLOAT);
    }

}