first commit

public/sdk/three/jsm/loaders/PVRLoader.js

@@ -0,0 +1,251 @@
+import {
+	CompressedTextureLoader,
+	RGBA_PVRTC_2BPPV1_Format,
+	RGBA_PVRTC_4BPPV1_Format,
+	RGB_PVRTC_2BPPV1_Format,
+	RGB_PVRTC_4BPPV1_Format
+} from 'three';
+
+/*
+ *	 PVR v2 (legacy) parser
+ *   TODO : Add Support for PVR v3 format
+ *   TODO : implement loadMipmaps option
+ */
+
+class PVRLoader extends CompressedTextureLoader {
+
+	constructor( manager ) {
+
+		super( manager );
+
+	}
+
+	parse( buffer, loadMipmaps ) {
+
+		const headerLengthInt = 13;
+		const header = new Uint32Array( buffer, 0, headerLengthInt );
+
+		const pvrDatas = {
+			buffer: buffer,
+			header: header,
+			loadMipmaps: loadMipmaps
+		};
+
+		if ( header[ 0 ] === 0x03525650 ) {
+
+			// PVR v3
+
+			return _parseV3( pvrDatas );
+
+		} else if ( header[ 11 ] === 0x21525650 ) {
+
+			// PVR v2
+
+			return _parseV2( pvrDatas );
+
+		} else {
+
+			console.error( 'THREE.PVRLoader: Unknown PVR format.' );
+
+		}
+
+	}
+
+}
+
+function _parseV3( pvrDatas ) {
+
+	const header = pvrDatas.header;
+	let bpp, format;
+
+
+	const metaLen = header[ 12 ],
+		pixelFormat = header[ 2 ],
+		height = header[ 6 ],
+		width = header[ 7 ],
+		// numSurfs = header[ 9 ],
+		numFaces = header[ 10 ],
+		numMipmaps = header[ 11 ];
+
+	switch ( pixelFormat ) {
+
+		case 0 : // PVRTC 2bpp RGB
+			bpp = 2;
+			format = RGB_PVRTC_2BPPV1_Format;
+			break;
+
+		case 1 : // PVRTC 2bpp RGBA
+			bpp = 2;
+			format = RGBA_PVRTC_2BPPV1_Format;
+			break;
+
+		case 2 : // PVRTC 4bpp RGB
+			bpp = 4;
+			format = RGB_PVRTC_4BPPV1_Format;
+			break;
+
+		case 3 : // PVRTC 4bpp RGBA
+			bpp = 4;
+			format = RGBA_PVRTC_4BPPV1_Format;
+			break;
+
+		default :
+			console.error( 'THREE.PVRLoader: Unsupported PVR format:', pixelFormat );
+
+	}
+
+	pvrDatas.dataPtr = 52 + metaLen;
+	pvrDatas.bpp = bpp;
+	pvrDatas.format = format;
+	pvrDatas.width = width;
+	pvrDatas.height = height;
+	pvrDatas.numSurfaces = numFaces;
+	pvrDatas.numMipmaps = numMipmaps;
+	pvrDatas.isCubemap 	= ( numFaces === 6 );
+
+	return _extract( pvrDatas );
+
+}
+
+function _parseV2( pvrDatas ) {
+
+	const header = pvrDatas.header;
+
+	const headerLength = header[ 0 ],
+		height = header[ 1 ],
+		width = header[ 2 ],
+		numMipmaps = header[ 3 ],
+		flags = header[ 4 ],
+		// dataLength = header[ 5 ],
+		// bpp =  header[ 6 ],
+		// bitmaskRed = header[ 7 ],
+		// bitmaskGreen = header[ 8 ],
+		// bitmaskBlue = header[ 9 ],
+		bitmaskAlpha = header[ 10 ],
+		// pvrTag = header[ 11 ],
+		numSurfs = header[ 12 ];
+
+
+	const TYPE_MASK = 0xff;
+	const PVRTC_2 = 24,
+		PVRTC_4 = 25;
+
+	const formatFlags = flags & TYPE_MASK;
+
+	let bpp, format;
+	const _hasAlpha = bitmaskAlpha > 0;
+
+	if ( formatFlags === PVRTC_4 ) {
+
+		format = _hasAlpha ? RGBA_PVRTC_4BPPV1_Format : RGB_PVRTC_4BPPV1_Format;
+		bpp = 4;
+
+	} else if ( formatFlags === PVRTC_2 ) {
+
+		format = _hasAlpha ? RGBA_PVRTC_2BPPV1_Format : RGB_PVRTC_2BPPV1_Format;
+		bpp = 2;
+
+	} else {
+
+		console.error( 'THREE.PVRLoader: Unknown PVR format:', formatFlags );
+
+	}
+
+	pvrDatas.dataPtr = headerLength;
+	pvrDatas.bpp = bpp;
+	pvrDatas.format = format;
+	pvrDatas.width = width;
+	pvrDatas.height = height;
+	pvrDatas.numSurfaces = numSurfs;
+	pvrDatas.numMipmaps = numMipmaps + 1;
+
+	// guess cubemap type seems tricky in v2
+	// it juste a pvr containing 6 surface (no explicit cubemap type)
+	pvrDatas.isCubemap 	= ( numSurfs === 6 );
+
+	return _extract( pvrDatas );
+
+}
+
+
+function _extract( pvrDatas ) {
+
+	const pvr = {
+		mipmaps: [],
+		width: pvrDatas.width,
+		height: pvrDatas.height,
+		format: pvrDatas.format,
+		mipmapCount: pvrDatas.numMipmaps,
+		isCubemap: pvrDatas.isCubemap
+	};
+
+	const buffer = pvrDatas.buffer;
+
+	let dataOffset = pvrDatas.dataPtr,
+		dataSize = 0,
+		blockSize = 0,
+		blockWidth = 0,
+		blockHeight = 0,
+		widthBlocks = 0,
+		heightBlocks = 0;
+
+	const bpp = pvrDatas.bpp,
+		numSurfs = pvrDatas.numSurfaces;
+
+	if ( bpp === 2 ) {
+
+		blockWidth = 8;
+		blockHeight = 4;
+
+	} else {
+
+		blockWidth = 4;
+		blockHeight = 4;
+
+	}
+
+	blockSize = ( blockWidth * blockHeight ) * bpp / 8;
+
+	pvr.mipmaps.length = pvrDatas.numMipmaps * numSurfs;
+
+	let mipLevel = 0;
+
+	while ( mipLevel < pvrDatas.numMipmaps ) {
+
+		const sWidth = pvrDatas.width >> mipLevel,
+			sHeight = pvrDatas.height >> mipLevel;
+
+		widthBlocks = sWidth / blockWidth;
+		heightBlocks = sHeight / blockHeight;
+
+		// Clamp to minimum number of blocks
+		if ( widthBlocks < 2 ) widthBlocks = 2;
+		if ( heightBlocks < 2 ) heightBlocks = 2;
+
+		dataSize = widthBlocks * heightBlocks * blockSize;
+
+		for ( let surfIndex = 0; surfIndex < numSurfs; surfIndex ++ ) {
+
+			const byteArray = new Uint8Array( buffer, dataOffset, dataSize );
+
+			const mipmap = {
+				data: byteArray,
+				width: sWidth,
+				height: sHeight
+			};
+
+			pvr.mipmaps[ surfIndex * pvrDatas.numMipmaps + mipLevel ] = mipmap;
+
+			dataOffset += dataSize;
+
+		}
+
+		mipLevel ++;
+
+	}
+
+	return pvr;
+
+}
+
+export { PVRLoader };