518 lines
11 KiB
JavaScript
518 lines
11 KiB
JavaScript
import {
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DataTextureLoader,
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LinearMipmapLinearFilter
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} from 'three';
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class TGALoader extends DataTextureLoader {
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constructor( manager ) {
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super( manager );
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}
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parse( buffer ) {
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// reference from vthibault, https://github.com/vthibault/roBrowser/blob/master/src/Loaders/Targa.js
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function tgaCheckHeader( header ) {
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switch ( header.image_type ) {
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// check indexed type
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case TGA_TYPE_INDEXED:
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case TGA_TYPE_RLE_INDEXED:
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if ( header.colormap_length > 256 || header.colormap_size !== 24 || header.colormap_type !== 1 ) {
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throw new Error( 'THREE.TGALoader: Invalid type colormap data for indexed type.' );
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}
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break;
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// check colormap type
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case TGA_TYPE_RGB:
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case TGA_TYPE_GREY:
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case TGA_TYPE_RLE_RGB:
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case TGA_TYPE_RLE_GREY:
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if ( header.colormap_type ) {
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throw new Error( 'THREE.TGALoader: Invalid type colormap data for colormap type.' );
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}
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break;
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// What the need of a file without data ?
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case TGA_TYPE_NO_DATA:
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throw new Error( 'THREE.TGALoader: No data.' );
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// Invalid type ?
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default:
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throw new Error( 'THREE.TGALoader: Invalid type ' + header.image_type );
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}
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// check image width and height
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if ( header.width <= 0 || header.height <= 0 ) {
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throw new Error( 'THREE.TGALoader: Invalid image size.' );
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}
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// check image pixel size
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if ( header.pixel_size !== 8 && header.pixel_size !== 16 &&
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header.pixel_size !== 24 && header.pixel_size !== 32 ) {
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throw new Error( 'THREE.TGALoader: Invalid pixel size ' + header.pixel_size );
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}
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}
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// parse tga image buffer
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function tgaParse( use_rle, use_pal, header, offset, data ) {
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let pixel_data,
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palettes;
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const pixel_size = header.pixel_size >> 3;
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const pixel_total = header.width * header.height * pixel_size;
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// read palettes
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if ( use_pal ) {
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palettes = data.subarray( offset, offset += header.colormap_length * ( header.colormap_size >> 3 ) );
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}
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// read RLE
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if ( use_rle ) {
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pixel_data = new Uint8Array( pixel_total );
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let c, count, i;
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let shift = 0;
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const pixels = new Uint8Array( pixel_size );
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while ( shift < pixel_total ) {
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c = data[ offset ++ ];
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count = ( c & 0x7f ) + 1;
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// RLE pixels
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if ( c & 0x80 ) {
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// bind pixel tmp array
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for ( i = 0; i < pixel_size; ++ i ) {
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pixels[ i ] = data[ offset ++ ];
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}
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// copy pixel array
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for ( i = 0; i < count; ++ i ) {
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pixel_data.set( pixels, shift + i * pixel_size );
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}
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shift += pixel_size * count;
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} else {
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// raw pixels
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count *= pixel_size;
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for ( i = 0; i < count; ++ i ) {
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pixel_data[ shift + i ] = data[ offset ++ ];
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}
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shift += count;
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}
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}
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} else {
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// raw pixels
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pixel_data = data.subarray(
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offset, offset += ( use_pal ? header.width * header.height : pixel_total )
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);
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}
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return {
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pixel_data: pixel_data,
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palettes: palettes
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};
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}
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function tgaGetImageData8bits( imageData, y_start, y_step, y_end, x_start, x_step, x_end, image, palettes ) {
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const colormap = palettes;
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let color, i = 0, x, y;
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const width = header.width;
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for ( y = y_start; y !== y_end; y += y_step ) {
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for ( x = x_start; x !== x_end; x += x_step, i ++ ) {
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color = image[ i ];
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imageData[ ( x + width * y ) * 4 + 3 ] = 255;
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imageData[ ( x + width * y ) * 4 + 2 ] = colormap[ ( color * 3 ) + 0 ];
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imageData[ ( x + width * y ) * 4 + 1 ] = colormap[ ( color * 3 ) + 1 ];
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imageData[ ( x + width * y ) * 4 + 0 ] = colormap[ ( color * 3 ) + 2 ];
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}
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}
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return imageData;
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}
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function tgaGetImageData16bits( imageData, y_start, y_step, y_end, x_start, x_step, x_end, image ) {
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let color, i = 0, x, y;
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const width = header.width;
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for ( y = y_start; y !== y_end; y += y_step ) {
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for ( x = x_start; x !== x_end; x += x_step, i += 2 ) {
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color = image[ i + 0 ] + ( image[ i + 1 ] << 8 );
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imageData[ ( x + width * y ) * 4 + 0 ] = ( color & 0x7C00 ) >> 7;
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imageData[ ( x + width * y ) * 4 + 1 ] = ( color & 0x03E0 ) >> 2;
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imageData[ ( x + width * y ) * 4 + 2 ] = ( color & 0x001F ) << 3;
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imageData[ ( x + width * y ) * 4 + 3 ] = ( color & 0x8000 ) ? 0 : 255;
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}
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}
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return imageData;
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}
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function tgaGetImageData24bits( imageData, y_start, y_step, y_end, x_start, x_step, x_end, image ) {
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let i = 0, x, y;
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const width = header.width;
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for ( y = y_start; y !== y_end; y += y_step ) {
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for ( x = x_start; x !== x_end; x += x_step, i += 3 ) {
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imageData[ ( x + width * y ) * 4 + 3 ] = 255;
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imageData[ ( x + width * y ) * 4 + 2 ] = image[ i + 0 ];
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imageData[ ( x + width * y ) * 4 + 1 ] = image[ i + 1 ];
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imageData[ ( x + width * y ) * 4 + 0 ] = image[ i + 2 ];
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}
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}
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return imageData;
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}
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function tgaGetImageData32bits( imageData, y_start, y_step, y_end, x_start, x_step, x_end, image ) {
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let i = 0, x, y;
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const width = header.width;
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for ( y = y_start; y !== y_end; y += y_step ) {
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for ( x = x_start; x !== x_end; x += x_step, i += 4 ) {
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imageData[ ( x + width * y ) * 4 + 2 ] = image[ i + 0 ];
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imageData[ ( x + width * y ) * 4 + 1 ] = image[ i + 1 ];
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imageData[ ( x + width * y ) * 4 + 0 ] = image[ i + 2 ];
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imageData[ ( x + width * y ) * 4 + 3 ] = image[ i + 3 ];
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}
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}
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return imageData;
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}
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function tgaGetImageDataGrey8bits( imageData, y_start, y_step, y_end, x_start, x_step, x_end, image ) {
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let color, i = 0, x, y;
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const width = header.width;
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for ( y = y_start; y !== y_end; y += y_step ) {
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for ( x = x_start; x !== x_end; x += x_step, i ++ ) {
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color = image[ i ];
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imageData[ ( x + width * y ) * 4 + 0 ] = color;
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imageData[ ( x + width * y ) * 4 + 1 ] = color;
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imageData[ ( x + width * y ) * 4 + 2 ] = color;
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imageData[ ( x + width * y ) * 4 + 3 ] = 255;
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}
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}
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return imageData;
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}
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function tgaGetImageDataGrey16bits( imageData, y_start, y_step, y_end, x_start, x_step, x_end, image ) {
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let i = 0, x, y;
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const width = header.width;
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for ( y = y_start; y !== y_end; y += y_step ) {
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for ( x = x_start; x !== x_end; x += x_step, i += 2 ) {
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imageData[ ( x + width * y ) * 4 + 0 ] = image[ i + 0 ];
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imageData[ ( x + width * y ) * 4 + 1 ] = image[ i + 0 ];
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imageData[ ( x + width * y ) * 4 + 2 ] = image[ i + 0 ];
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imageData[ ( x + width * y ) * 4 + 3 ] = image[ i + 1 ];
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}
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}
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return imageData;
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}
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function getTgaRGBA( data, width, height, image, palette ) {
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let x_start,
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y_start,
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x_step,
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y_step,
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x_end,
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y_end;
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switch ( ( header.flags & TGA_ORIGIN_MASK ) >> TGA_ORIGIN_SHIFT ) {
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default:
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case TGA_ORIGIN_UL:
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x_start = 0;
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x_step = 1;
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x_end = width;
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y_start = 0;
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y_step = 1;
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y_end = height;
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break;
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case TGA_ORIGIN_BL:
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x_start = 0;
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x_step = 1;
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x_end = width;
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y_start = height - 1;
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y_step = - 1;
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y_end = - 1;
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break;
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case TGA_ORIGIN_UR:
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x_start = width - 1;
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x_step = - 1;
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x_end = - 1;
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y_start = 0;
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y_step = 1;
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y_end = height;
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break;
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case TGA_ORIGIN_BR:
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x_start = width - 1;
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x_step = - 1;
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x_end = - 1;
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y_start = height - 1;
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y_step = - 1;
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y_end = - 1;
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break;
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}
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if ( use_grey ) {
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switch ( header.pixel_size ) {
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case 8:
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tgaGetImageDataGrey8bits( data, y_start, y_step, y_end, x_start, x_step, x_end, image );
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break;
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case 16:
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tgaGetImageDataGrey16bits( data, y_start, y_step, y_end, x_start, x_step, x_end, image );
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break;
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default:
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throw new Error( 'THREE.TGALoader: Format not supported.' );
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break;
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}
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} else {
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switch ( header.pixel_size ) {
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case 8:
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tgaGetImageData8bits( data, y_start, y_step, y_end, x_start, x_step, x_end, image, palette );
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break;
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case 16:
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tgaGetImageData16bits( data, y_start, y_step, y_end, x_start, x_step, x_end, image );
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break;
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case 24:
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tgaGetImageData24bits( data, y_start, y_step, y_end, x_start, x_step, x_end, image );
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break;
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case 32:
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tgaGetImageData32bits( data, y_start, y_step, y_end, x_start, x_step, x_end, image );
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break;
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default:
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throw new Error( 'THREE.TGALoader: Format not supported.' );
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break;
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}
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}
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// Load image data according to specific method
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// let func = 'tgaGetImageData' + (use_grey ? 'Grey' : '') + (header.pixel_size) + 'bits';
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// func(data, y_start, y_step, y_end, x_start, x_step, x_end, width, image, palette );
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return data;
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}
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// TGA constants
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const TGA_TYPE_NO_DATA = 0,
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TGA_TYPE_INDEXED = 1,
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TGA_TYPE_RGB = 2,
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TGA_TYPE_GREY = 3,
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TGA_TYPE_RLE_INDEXED = 9,
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TGA_TYPE_RLE_RGB = 10,
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TGA_TYPE_RLE_GREY = 11,
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TGA_ORIGIN_MASK = 0x30,
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TGA_ORIGIN_SHIFT = 0x04,
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TGA_ORIGIN_BL = 0x00,
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TGA_ORIGIN_BR = 0x01,
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TGA_ORIGIN_UL = 0x02,
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TGA_ORIGIN_UR = 0x03;
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if ( buffer.length < 19 ) throw new Error( 'THREE.TGALoader: Not enough data to contain header.' );
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let offset = 0;
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const content = new Uint8Array( buffer ),
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header = {
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id_length: content[ offset ++ ],
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colormap_type: content[ offset ++ ],
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image_type: content[ offset ++ ],
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colormap_index: content[ offset ++ ] | content[ offset ++ ] << 8,
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colormap_length: content[ offset ++ ] | content[ offset ++ ] << 8,
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colormap_size: content[ offset ++ ],
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origin: [
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content[ offset ++ ] | content[ offset ++ ] << 8,
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content[ offset ++ ] | content[ offset ++ ] << 8
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],
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width: content[ offset ++ ] | content[ offset ++ ] << 8,
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height: content[ offset ++ ] | content[ offset ++ ] << 8,
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pixel_size: content[ offset ++ ],
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flags: content[ offset ++ ]
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};
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// check tga if it is valid format
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tgaCheckHeader( header );
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if ( header.id_length + offset > buffer.length ) {
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throw new Error( 'THREE.TGALoader: No data.' );
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}
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// skip the needn't data
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offset += header.id_length;
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// get targa information about RLE compression and palette
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let use_rle = false,
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use_pal = false,
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use_grey = false;
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switch ( header.image_type ) {
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case TGA_TYPE_RLE_INDEXED:
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use_rle = true;
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use_pal = true;
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break;
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case TGA_TYPE_INDEXED:
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use_pal = true;
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break;
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case TGA_TYPE_RLE_RGB:
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use_rle = true;
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break;
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case TGA_TYPE_RGB:
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break;
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case TGA_TYPE_RLE_GREY:
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use_rle = true;
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use_grey = true;
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break;
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case TGA_TYPE_GREY:
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use_grey = true;
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break;
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}
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//
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const imageData = new Uint8Array( header.width * header.height * 4 );
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const result = tgaParse( use_rle, use_pal, header, offset, content );
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getTgaRGBA( imageData, header.width, header.height, result.pixel_data, result.palettes );
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return {
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data: imageData,
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width: header.width,
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height: header.height,
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flipY: true,
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generateMipmaps: true,
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minFilter: LinearMipmapLinearFilter,
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};
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}
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}
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export { TGALoader };
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