Texture2DArray

텍스처를 매번 올리는 작업을 Texture2DArray 를 만들어 여러장의 택스처를 한번에 전송을 할수 있는 기능.

CPU의 부담도 줄어 준다고 합니다.

최고 512 개까지 저장하는 구조체

 

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class Sample2DArrayTexture : MonoBehaviour
{
    public Texture2D texture2D_1;
    public Texture2D texture2D_2;
    public Texture2D texture2D_3;
    public Texture2D texture2D_4;

    public Texture2DArray texture2DArray;

    public Material material;

    public float slices = 10;
    // Start is called before the first frame update
    void Start()
    {
        texture2DArray = new Texture2DArray(512, 512, 4, TextureFormat.RGB24, false);

        var colors = texture2D_1.GetPixels();
        Debug.Log($" {colors.Length}");
    }

    // Update is called once per frame
    void Update()
    {
        slices += Time.smoothDeltaTime;
        material.SetFloat("_SliceRange", slices);
        if (slices > 5)
            slices = 0;
    }

    public void OnClick1()
    {
        texture2DArray.SetPixels(texture2D_1.GetPixels(0), 0, 0);
        texture2DArray.SetPixels(texture2D_2.GetPixels(0), 1, 0);
        texture2DArray.SetPixels(texture2D_3.GetPixels(0), 2, 0);
        texture2DArray.SetPixels(texture2D_4.GetPixels(0), 3, 0);
        texture2DArray.Apply();

        material.SetTexture("_MyArr", texture2DArray);
    }

    public void OnClick2()
    {
        texture2DArray.SetPixels(texture2D_4.GetPixels(0), 0, 0);
        texture2DArray.SetPixels(texture2D_3.GetPixels(0), 1, 0);
        texture2DArray.SetPixels(texture2D_2.GetPixels(0), 2, 0);
        texture2DArray.SetPixels(texture2D_1.GetPixels(0), 3, 0);
        texture2DArray.Apply();

        material.SetTexture("_MyArr", texture2DArray);
    }
}

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Example/Sample2DArrayTexture"
{

    Properties
    {
        _MyArr ("Tex", 2DArray) = "" {}
        _SliceRange ("Slices", Range(0,5)) = 0
        _UVScale ("UVScale", Float) = 1.0
    }
    SubShader
    {
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma require 2darray
            
            #include "UnityCG.cginc"

            struct v2f
            {
                float3 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            float _SliceRange;
            float _UVScale;

            v2f vert (float4 vertex : POSITION)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(vertex);
                o.uv.xy = (vertex.xy + 0.5) * _UVScale;
                o.uv.z = _SliceRange - 0.5;
                return o;
            }
            
            UNITY_DECLARE_TEX2DARRAY(_MyArr);

            half4 frag (v2f i) : SV_Target
            {
                return UNITY_SAMPLE_TEX2DARRAY(_MyArr, i.uv);
            }
            ENDCG
        }
    }
}