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A method that allows for fast GPU resizing in the Unity Engine.
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/* LICENSE | |
Copyright (c) 2019 Adrian Babilinski | |
Permission is hereby granted, free of charge, to any person obtaining a copy | |
of this software and associated documentation files (the "Software"), to deal | |
in the Software without restriction, including without limitation the rights | |
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
copies of the Software, and to permit persons to whom the Software is | |
furnished to do so, subject to the following conditions: | |
The above copyright notice and this permission notice shall be included in all | |
copies or substantial portions of the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
SOFTWARE. | |
*/ | |
/* This class allows you to resize an image on the GPU. | |
Resizing an image from 1024px to 8196px 100 times took this method: 00:00:40.8884790 | |
Resizing an image from 1024px to 8196px 100 times with Unity.Texture2D.Resize() took: 01:08:08.55 | |
*/ | |
public class ResizeTool | |
{ | |
public static void Resize(Texture2D texture2D, int targetX, int targetY, bool mipmap =true, FilterMode filter = FilterMode.Bilinear) | |
{ | |
RenderTexture rt = RenderTexture.GetTemporary(targetX, targetY, 0, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Default); | |
RenderTexture.active = rt; | |
Graphics.Blit(texture2D, rt); | |
texture2D.Resize(targetX, targetY, texture2D.format, mipmap); | |
texture2D.filterMode = filter; | |
try | |
{ | |
texture2D.ReadPixels(new Rect(0.0f, 0.0f, targetX, targetY), 0, 0); | |
texture2D.Apply(); | |
} | |
catch | |
{ | |
Debug.LogError("Read/Write is not enabled on texture "+ texture2D.name); | |
} | |
RenderTexture.ReleaseTemporary(rt); | |
} | |
} | |
} |
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Why This Script Was Created
This class allows you to resize an image on the GPU.
Speeds
ResizeTool.Resize(..)
UnityEngine.Texture2D.Resize(..)