VertexLayoutDesc.h

//
//  VertexLayoutDesc.h
//  avara3d
//
//  Created by Morgan Davis on 1/4/26.
//  Copyright © 2026 Morgan K Davis. All rights reserved.
//
 
#ifndef AVARA3D_MESH_VERTEXLAYOUTDESC_H
#define AVARA3D_MESH_VERTEXLAYOUTDESC_H
 
#include <cstdint>
#include <span>
 
#include "a3d/mesh/VertexLayout.h"
 
namespace a3d {
 
    enum class VertexAttribFormat : uint8_t {
        F32x2,
        F32x3,
        F32x4,
        // UN8x4
        // I16x4N
    };
 
    enum class VertexSemantic : uint8_t {
        Position,
        Normal,
        TexCoord0,
        Color0,
    };
 
    struct VertexAttribDesc {
        VertexSemantic     semantic   = VertexSemantic::Position;
        uint8_t            location   = 0; // shader location
        VertexAttribFormat format     = VertexAttribFormat::F32x3;
        uint16_t           offset     = 0; // byte offset in vertex
        bool               normalized = false;
    };
 
    struct VertexLayoutDesc {
        uint16_t                          stride  = 0;
        std::span<const VertexAttribDesc> attribs = {};
    };
 
    const VertexLayoutDesc& GetVertexLayoutDesc(VertexLayout layout);
 
}
 
#endif // AVARA3D_MESH_VERTEXLAYOUTDESC_H