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