optimize: GPU compressed texture load logic

优化压缩纹理加载流程

Author: Geequlim

src/layaAir/laya/RenderEngine/RenderEnum/TextureFormat.ts

@@ -1,3 +1,5 @@
+import { RenderCapable } from './RenderCapable';
+
 /**
  * 纹理格式
  */
@@ -72,4 +74,41 @@ export enum TextureFormat {
     KTXTEXTURE = -1,
     /**pvr图片 */
     PVRTEXTURE = -2
-}
+}
+
+/** 通过纹理格式获取压缩纹理类型 */
+export function getCompressTextureRenderCapable(format: TextureFormat): RenderCapable | null {
+    switch (format) {
+        case TextureFormat.ASTC4x4:
+        case TextureFormat.ASTC4x4SRGB:
+        case TextureFormat.ASTC6x6:
+        case TextureFormat.ASTC6x6SRGB:
+        case TextureFormat.ASTC8x8:
+        case TextureFormat.ASTC8x8SRGB:
+        case TextureFormat.ASTC10x10:
+        case TextureFormat.ASTC10x10SRGB:
+        case TextureFormat.ASTC12x12:
+        case TextureFormat.ASTC12x12SRGB:
+            return RenderCapable.COMPRESS_TEXTURE_ASTC;
+        case TextureFormat.DXT1:
+        case TextureFormat.DXT3:
+        case TextureFormat.DXT5:
+            return RenderCapable.COMPRESS_TEXTURE_S3TC;
+        case TextureFormat.PVRTCRGB_2BPPV:
+        case TextureFormat.PVRTCRGBA_2BPPV:
+        case TextureFormat.PVRTCRGB_4BPPV:
+        case TextureFormat.PVRTCRGBA_4BPPV:
+            return RenderCapable.COMPRESS_TEXTURE_PVRTC;
+        case TextureFormat.ETC2RGB:
+        case TextureFormat.ETC2RGBA:
+        case TextureFormat.ETC2SRGB_Alpha8:
+        case TextureFormat.ETC2SRGB:
+        case TextureFormat.ETC2RGB_Alpha1:
+        case TextureFormat.ETC2SRGB_Alpha1:
+            return RenderCapable.COMPRESS_TEXTURE_ETC;
+        case TextureFormat.ETC1RGB:
+            return RenderCapable.COMPRESS_TEXTURE_ETC1;
+        default:
+            return null;
+    }
+}

src/layaAir/laya/loaders/TextureLoader.ts

@@ -6,7 +6,7 @@ import { KTXTextureInfo } from "../RenderEngine/KTXTextureInfo";
 import { TextureDimension } from "../RenderEngine/RenderEnum/TextureDimension";
 import { ClassUtils } from "../utils/ClassUtils";
 import { BaseTexture } from "../resource/BaseTexture";
-import { TextureFormat } from "../RenderEngine/RenderEnum/TextureFormat";
+import { getCompressTextureRenderCapable, TextureFormat } from "../RenderEngine/RenderEnum/TextureFormat";
 import { Browser } from "../utils/Browser";
 import { AssetDb } from "../resource/AssetDb";
 import { Resource } from "../resource/Resource";
@@ -57,15 +57,30 @@ export class Texture2DLoader implements IResourceLoader {
         let ext = task.ext;
         let url = task.url;
         if (meta) {
+            const RGBA = { format: TextureFormat.R8G8B8A8, file: null as string, ext: null as string };
             let platform = Browser.platform;
-            let fileIndex = meta.platforms?.[platform] || 0;
-            let fileInfo = meta.files?.[fileIndex] || {};
+            let fileInfo = RGBA;
+            if (platform in meta.platforms) {
+                const fileIndex = meta.platforms[platform];
+                fileInfo = meta.files[fileIndex];
+            }
+
+            let capable = getCompressTextureRenderCapable(fileInfo.format);
+            if (capable && !LayaGL.renderEngine.getCapable(capable)) { // 当前环境是不支持 meta 中设置的压缩纹理格式
+                const fallback = (meta.files as (typeof fileInfo)[]).find(f =>{
+                    // 找到第一个支持的压缩纹理格式
+                    const c = getCompressTextureRenderCapable(f.format);
+                    return LayaGL.renderEngine.getCapable(c);
+                });
+                fileInfo = fallback || RGBA;
+            }
+
             if (fileInfo.file) {
                 url = AssetDb.inst.getSubAssetURL(url, task.uuid, fileInfo.file, fileInfo.ext);
                 ext = fileInfo.ext;
             }
 
-            constructParams = [0, 0, fileInfo.format ?? 1, meta.mipmap, meta.readWrite, meta.sRGB];
+            constructParams = [0, 0, fileInfo.format, meta.mipmap, meta.readWrite, meta.sRGB];
             propertyParams = {
                 wrapModeU: meta.wrapMode,
                 wrapModeV: meta.wrapMode,
@@ -293,4 +308,4 @@ const videoFormats = ["mp4", "webm"];
 Loader.registerLoader(["tga", "tif", "tiff", "png", "jpg", "jpeg", "webp", "rendertexture", ...videoFormats, ...compressedFormats], TextureLoader, Loader.IMAGE, true);
 Loader.registerLoader([], Texture2DLoader, Loader.TEXTURE2D, true);
 Loader.registerLoader(["rendertexture"], RenderTextureLoader, Loader.TEXTURE2D, true);
-Loader.registerLoader(videoFormats, VideoTextureLoader, Loader.TEXTURE2D);
+Loader.registerLoader(videoFormats, VideoTextureLoader, Loader.TEXTURE2D);