MeshFormats.hpp

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/* This file is part of Berserk Engine project                                    */
/* https://github.com/EgorOrachyov/Berserk                                        */
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/* Copyright (c) 2018 - 2021 Egor Orachyov                                        */
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#ifndef BERSERK_MESHFORMATS_HPP
#define BERSERK_MESHFORMATS_HPP
 
#include <core/Config.hpp>
#include <core/Typedefs.hpp>
#include <core/templates/Mask.hpp>
#include <rhi/RHIDefs.hpp>
#include <rhi/RHIVertexDeclaration.hpp>
 
#include <mutex>
#include <unordered_map>
 
BRK_NS_BEGIN
 
enum class MeshAttribute : uint8 {
    Position = 0,
    Normal = 1,
    Tangent = 2,
    Color = 3,
    UV = 4,
    UV2 = 5,
    Weights = 6,
    Bones = 7
};
 
struct MeshAttributeInfo {
    bool vertex = false;
    bool attribute = false;
    bool skinning = false;
    uint32 size = 0;
    RHIVertexElementType elementType = RHIVertexElementType::Unknown;
};
 
using MeshFormat = Mask<MeshAttribute, 8>;
 
class MeshFormats final {
public:
    BRK_API MeshFormats() = default;
    BRK_API ~MeshFormats() = default;
 
    BRK_API Ref<RHIVertexDeclaration> GetDeclaration(MeshFormat target, MeshFormat format);
    BRK_API Ref<RHIVertexDeclaration> GetDeclaration(MeshFormat target);
    BRK_API uint32 GetAttributeOffset(MeshAttribute attribute, MeshFormat format);
    BRK_API void GetStride(MeshFormat format, uint32 &vertex, uint32 &attribute, uint32 &skinning);
 
private:
    std::unordered_map<String, Ref<RHIVertexDeclaration>> mCached;
    mutable std::mutex mMutex;
};
 
inline MeshAttributeInfo MeshGetAttributeInfo(MeshAttribute attribute) {
    MeshAttributeInfo info{};
 
    switch (attribute) {
        case MeshAttribute::Position:
        case MeshAttribute::Normal:
        case MeshAttribute::Tangent:
            info.vertex = true;
            info.size = 3 * sizeof(float);
            info.elementType = RHIVertexElementType::Float3;
            break;
        case MeshAttribute::Color:
            info.attribute = true;
            info.size = 3 * sizeof(float);
            info.elementType = RHIVertexElementType::Float3;
            break;
        case MeshAttribute::UV:
        case MeshAttribute::UV2:
            info.attribute = true;
            info.size = 2 * sizeof(float);
            info.elementType = RHIVertexElementType::Float2;
            break;
        case MeshAttribute::Weights:
            info.skinning = true;
            info.size = 4 * sizeof(float);
            info.elementType = RHIVertexElementType::Float4;
            break;
        case MeshAttribute::Bones:
            info.skinning = true;
            info.size = 4 * sizeof(int);
            info.elementType = RHIVertexElementType::Int4;
            break;
        default:
            break;
    }
 
    return info;
}
 
BRK_NS_END
 
#endif//BERSERK_MESHFORMATS_HPP