| | | 1 | | using UnityEngine; |
| | | 2 | | using UnityEngine.Rendering; |
| | | 3 | | |
| | | 4 | | public static class TextureHelpers |
| | | 5 | | { |
| | | 6 | | public static void EnsureTexture2DMaxSize(ref Texture2D texture, int maxTextureSize) |
| | | 7 | | { |
| | 0 | 8 | | if (texture == null) |
| | 0 | 9 | | return; |
| | | 10 | | |
| | 0 | 11 | | if (texture.width == 0 || texture.height == 0) |
| | 0 | 12 | | return; |
| | | 13 | | |
| | 0 | 14 | | if (Mathf.Max(texture.height, texture.width) <= maxTextureSize) |
| | 0 | 15 | | return; |
| | | 16 | | |
| | | 17 | | int w, h; |
| | 0 | 18 | | if (texture.height > texture.width) |
| | | 19 | | { |
| | 0 | 20 | | h = maxTextureSize; |
| | 0 | 21 | | w = (int) ((texture.width / (float) texture.height) * h); |
| | 0 | 22 | | } |
| | | 23 | | else |
| | | 24 | | { |
| | 0 | 25 | | w = maxTextureSize; |
| | 0 | 26 | | h = (int) ((texture.height / (float) texture.width) * w); |
| | | 27 | | } |
| | | 28 | | |
| | 0 | 29 | | var newTexture = Resize(texture, w, h); |
| | 0 | 30 | | var oldTexture = texture; |
| | 0 | 31 | | texture = newTexture; |
| | 0 | 32 | | Object.Destroy(oldTexture); |
| | 0 | 33 | | } |
| | | 34 | | |
| | | 35 | | public static Texture2D Resize(Texture2D source, int newWidth, int newHeight, bool linear = false) |
| | | 36 | | { |
| | | 37 | | // RenderTexture default format is ARGB32 |
| | 129 | 38 | | Texture2D nTex = new Texture2D(newWidth, newHeight, TextureFormat.ARGB32, 1, linear); |
| | 129 | 39 | | nTex.filterMode = source.filterMode; |
| | 129 | 40 | | nTex.wrapMode = source.wrapMode; |
| | | 41 | | |
| | 129 | 42 | | RenderTexture rt = RenderTexture.GetTemporary(newWidth, newHeight); |
| | 129 | 43 | | rt.filterMode = FilterMode.Point; |
| | 129 | 44 | | source.filterMode = FilterMode.Point; |
| | | 45 | | |
| | 129 | 46 | | RenderTexture.active = rt; |
| | 129 | 47 | | Graphics.Blit(source, rt); |
| | | 48 | | |
| | 129 | 49 | | bool supportsGPUTextureCopy = SystemInfo.copyTextureSupport != CopyTextureSupport.None; |
| | 129 | 50 | | if (supportsGPUTextureCopy) |
| | | 51 | | { |
| | 129 | 52 | | Graphics.CopyTexture(rt, nTex); |
| | 129 | 53 | | } |
| | | 54 | | else |
| | | 55 | | { |
| | 0 | 56 | | nTex.ReadPixels(new Rect(0, 0, newWidth, newHeight), 0, 0); |
| | 0 | 57 | | nTex.Apply(); |
| | | 58 | | } |
| | | 59 | | |
| | 129 | 60 | | RenderTexture.ReleaseTemporary(rt); |
| | 129 | 61 | | RenderTexture.active = null; |
| | | 62 | | |
| | 129 | 63 | | return nTex; |
| | | 64 | | } |
| | | 65 | | |
| | | 66 | | public static Texture2D CopyTexture(Texture2D sourceTexture) |
| | | 67 | | { |
| | 1 | 68 | | Texture2D texture = new Texture2D(sourceTexture.width, sourceTexture.height, sourceTexture.format, false); |
| | | 69 | | |
| | | 70 | | // Note: Surprisingly this works in WebGL here but it doesn't work in Resize() |
| | 1 | 71 | | Graphics.CopyTexture(sourceTexture, texture); |
| | | 72 | | |
| | 1 | 73 | | return texture; |
| | | 74 | | } |
| | | 75 | | } |