unity源碼解析Texture

Texture類繼承自Object是作爲一個Texture2D與Texture3D的基類存在的，一般也並不直接使用它，且其本身也並沒有對紋理數據的管理，只有一個，就是獲取紋理的id

using System;
using System.Runtime.CompilerServices;

namespace UnityEngine
{
    public class Texture : Object
    {
        public static extern int masterTextureLimit
        {
            [WrapperlessIcall]
            [MethodImpl(MethodImplOptions.InternalCall)]
            get;
            [WrapperlessIcall]
            [MethodImpl(MethodImplOptions.InternalCall)]
            set;
        }

        public static extern AnisotropicFiltering anisotropicFiltering
        {
            [WrapperlessIcall]
            [MethodImpl(MethodImplOptions.InternalCall)]
            get;
            [WrapperlessIcall]
            [MethodImpl(MethodImplOptions.InternalCall)]
            set;
        }

        public virtual int width
        {
            get
            {
                return Texture.Internal_GetWidth(this);
            }
            set
            {
                throw new Exception("not implemented");
            }
        }

        public virtual int height
        {
            get
            {
                return Texture.Internal_GetHeight(this);
            }
            set
            {
                throw new Exception("not implemented");
            }
        }

        public extern FilterMode filterMode
        {
            [WrapperlessIcall]
            [MethodImpl(MethodImplOptions.InternalCall)]
            get;
            [WrapperlessIcall]
            [MethodImpl(MethodImplOptions.InternalCall)]
            set;
        }

        public extern int anisoLevel
        {
            [WrapperlessIcall]
            [MethodImpl(MethodImplOptions.InternalCall)]
            get;
            [WrapperlessIcall]
            [MethodImpl(MethodImplOptions.InternalCall)]
            set;
        }

        public extern TextureWrapMode wrapMode
        {
            [WrapperlessIcall]
            [MethodImpl(MethodImplOptions.InternalCall)]
            get;
            [WrapperlessIcall]
            [MethodImpl(MethodImplOptions.InternalCall)]
            set;
        }

        public extern float mipMapBias
        {
            [WrapperlessIcall]
            [MethodImpl(MethodImplOptions.InternalCall)]
            get;
            [WrapperlessIcall]
            [MethodImpl(MethodImplOptions.InternalCall)]
            set;
        }

        public Vector2 texelSize
        {
            get
            {
                Vector2 result;
                Texture.Internal_GetTexelSize(this,out result);
                return result;
            }
        }

        [WrapperlessIcall]
        [MethodImpl(MethodImplOptions.InternalCall)]
        public static extern void SetGlobalAnisotropicFilteringLimits(int forcedMin,int globalMax);

        [WrapperlessIcall]
        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern int Internal_GetWidth(Texture mono);

        [WrapperlessIcall]
        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern int Internal_GetHeight(Texture mono);

        [WrapperlessIcall]
        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern void Internal_GetTexelSize(Texture tex,out Vector2 output);

        [WrapperlessIcall]
        [MethodImpl(MethodImplOptions.InternalCall)]
        public extern IntPtr GetNativeTexturePtr(); //讀取本地文件生成的Texture獲取指針，可以爲Texture2d的創建提供數據

        [WrapperlessIcall]
        [MethodImpl(MethodImplOptions.InternalCall)]
        public extern int GetNativeTextureID();
    }
}