Resolve "Mesh Shader Implementation"

Closes #87 (closed)

modules/meshlet/include/vkcv/meshlet/Meshlet.hpp

+#pragma once
+
+#include <vector>
+#include <map>
+#include <glm/glm.hpp>
+#include <vkcv/asset/asset_loader.hpp>
+
+namespace vkcv::meshlet {
+
+    struct Vertex {
+        glm::vec3   position;
+        float       padding0;
+        glm::vec3   normal;
+        float       padding1;
+    };
+
+    struct Meshlet {
+        uint32_t    vertexOffset;
+        uint32_t    vertexCount;
+        uint32_t    indexOffset;
+        uint32_t    indexCount;
+        glm::vec3   meanPosition;
+        float       boundingSphereRadius;
+    };
+
+    struct VertexCacheReorderResult {
+        /**
+         * @param indexBuffer new indexBuffer
+         * @param skippedIndices indices that have a spacial break
+         */
+        VertexCacheReorderResult(const std::vector<uint32_t> indexBuffer, const std::vector<uint32_t> skippedIndices)
+                :indexBuffer(indexBuffer), skippedIndices(skippedIndices) {}
+
+        std::vector<uint32_t> indexBuffer;
+        std::vector<uint32_t>  skippedIndices;
+    };
+
+    struct MeshShaderModelData {
+        std::vector<Vertex>     vertices;
+        std::vector<uint32_t>   localIndices;
+        std::vector<Meshlet>    meshlets;
+    };
+
+    std::vector<Vertex> convertToVertices(
+            const std::vector<uint8_t>&         vertexData,
+            const uint64_t                      vertexCount,
+            const vkcv::asset::VertexAttribute& positionAttribute,
+            const vkcv::asset::VertexAttribute& normalAttribute);
+
+    MeshShaderModelData createMeshShaderModelData(
+            const std::vector<Vertex>&      inVertices,
+            const std::vector<uint32_t>&    inIndices,
+            const std::vector<uint32_t>& deadEndIndices = {});
+
+    std::vector<uint32_t> assetLoaderIndicesTo32BitIndices(
+            const std::vector<uint8_t>& indexData,
+            vkcv::asset::IndexType indexType);
+
+}
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