Add skybox

Signed-off-by: Slendi <slendi@socopon.com>

src/Skybox.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <cstdint>
+#include <filesystem>
+
+#include <vulkan/vulkan.hpp>
+
+#include "Pipeline.h"
+#include "Types.h"
+#include "VulkanRenderer.h"
+
+namespace Lunar {
+
+struct Skybox {
+	bool ok { false };
+
+	auto init(VulkanRenderer &renderer, std::filesystem::path const &path)
+	    -> void;
+	auto destroy(VulkanRenderer &renderer) -> void;
+	auto draw(VulkanRenderer::GL &gl, smath::Mat4 const &mvp) -> void;
+
+private:
+	Pipeline m_pipeline {};
+	GPUMeshBuffers m_cube_mesh {};
+	AllocatedImage m_cubemap {};
+	vk::UniqueSampler m_sampler {};
+	vk::UniqueDescriptorPool m_descriptor_pool {};
+	vk::DescriptorSet m_descriptor_set {};
+	uint32_t m_index_count { 0 };
+};
+
+} // namespace Lunar