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btnx.js
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btnx.js
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const struct = require('python-struct');
const BNTX_MAGIC = 'BNTX';
const NX_MAGIC = 'NX';
const BRTI_MAGIC = 'BRTI';
const BYTE_ORDER = {
BIG: 0xFEFF,
LITTLE: 0xFFFE
};
const TEXTURE_FORMAT_TYPES = {
R5G6B5: 0x07,
R8G8: 0x09,
R16: 0x0a,
R8G8B8A8: 0x0b,
R11G11B10: 0x0f,
R32: 0x14,
BC1: 0x1a,
BC2: 0x1b,
BC3: 0x1c,
BC4: 0x1d,
BC5: 0x1e,
ASTC4x4: 0x2d,
ASTC5x4: 0x2e,
ASTC5x5: 0x2f,
ASTC6x5: 0x30,
ASTC6x6: 0x31,
ASTC8x5: 0x32,
ASTC8x6: 0x33,
ASTC8x8: 0x34,
ASTC10x5: 0x35,
ASTC10x6: 0x36,
ASTC10x8: 0x37,
ASTC10x10: 0x38,
ASTC12x10: 0x39,
ASTC12x12: 0x3a
};
class BNTX {
constructor(stream) {
this.offset = stream.pos; // binary texture offsets are relative to the texture start!
this.textures = [];
this.bom = stream.bom;
let magic = stream.String(4);
if (magic != BNTX_MAGIC) {
throw new Error('File not BNTX file');
}
stream.skip(4); // padding
const real_pos = stream.pos;
stream.skip(4); // length. skip for now
if (stream.UInt16BE() == BYTE_ORDER.BIG) {
this.bom = '>';
} else {
this.bom = '<';
}
stream.seek(real_pos); // going back!
this.data_length = struct.unpack(`${this.bom}I`, stream.bytes(4))[0];
stream.skip(2); // bom, already read
this.format_revision = struct.unpack(`${this.bom}H`, stream.bytes(2))[0];
this.name_address = struct.unpack(`${this.bom}I`, stream.bytes(4))[0];
this.strings_address = struct.unpack(`${this.bom}I`, stream.bytes(4))[0] >> 16;
this.reloc_address = struct.unpack(`${this.bom}I`, stream.bytes(4))[0];
this.file_length = struct.unpack(`${this.bom}I`, stream.bytes(4))[0];
this.name = stream.parse_string(this.offset + this.name_address);
magic = stream.String(2);
if (magic != NX_MAGIC) {
throw new Error('Failed to find NX header');
}
stream.skip(2); // padding
this.texture_count = struct.unpack(`${this.bom}I`, stream.bytes(4))[0];
this.info_address = struct.unpack(`${this.bom}Q`, stream.bytes(8))[0].toNumber();
this.data_block_address = struct.unpack(`${this.bom}Q`, stream.bytes(8))[0].toNumber();
this.dict_address = struct.unpack(`${this.bom}Q`, stream.bytes(8))[0].toNumber();
this.string_dict_length = struct.unpack(`${this.bom}I`, stream.bytes(4))[0];
for (let i = 0; i < this.texture_count; i++) {
stream.seek(this.offset + (this.info_address + (i * 8)));
stream.seek(this.offset + struct.unpack(`${this.bom}Q`, stream.bytes(8))[0].toNumber());
const new_texture = new Texture(stream);
stream.seek(this.offset + new_texture.name_address);
new_texture.name = stream.String(struct.unpack(`${this.bom}H`, stream.bytes(2))[0]);
stream.seek(this.offset + new_texture.ptrs_address);
const base_offset = struct.unpack(`${this.bom}Q`, stream.bytes(8))[0].toNumber();
for (let mip = 1; mip < new_texture.mipmap_count; mip++) {
new_texture.mip_offsets[mip] = struct.unpack(`${this.bom}Q`, stream.bytes(8))[0].toNumber() - base_offset;
}
stream.seek(this.offset + base_offset);
new_texture.data = stream.bytes(new_texture.data_length);
this.textures.push(new_texture);
}
}
}
class Texture {
constructor(stream) {
this.mip_offsets = [];
const magic = stream.String(4);
if (magic != BRTI_MAGIC) {
throw new Error('Failed to find BRTI header');
}
this.BRTI_length_0 = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.BRTI_length_1 = struct.unpack(`${stream.bom}q`, stream.bytes(8))[0].toNumber();
this.flags = stream.Int8();
this.dimensions = stream.Int8();
this.tile_mode = struct.unpack(`${stream.bom}h`, stream.bytes(2))[0];
this.swizzle_size = struct.unpack(`${stream.bom}h`, stream.bytes(2))[0];
this.mipmap_count = struct.unpack(`${stream.bom}h`, stream.bytes(2))[0];
this.multi_sample_count = struct.unpack(`${stream.bom}h`, stream.bytes(2))[0];
this.reversed_1A = struct.unpack(`${stream.bom}h`, stream.bytes(2))[0];
this.format = struct.unpack(`${stream.bom}I`, stream.bytes(4))[0];
this.access_flags = struct.unpack(`${stream.bom}I`, stream.bytes(4))[0];
this.width = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.height = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.depth = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.array_count = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.block_height_log_2 = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.reserved_38 = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.reserved_3C = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.reserved_40 = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.reserved_44 = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.reserved_48 = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.reserved_4C = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.data_length = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.alignment = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.channel_types = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.texture_type = struct.unpack(`${stream.bom}i`, stream.bytes(4))[0];
this.name_address = struct.unpack(`${stream.bom}q`, stream.bytes(8))[0].toNumber();
this.parent_address = struct.unpack(`${stream.bom}q`, stream.bytes(8))[0].toNumber();
this.ptrs_address = struct.unpack(`${stream.bom}q`, stream.bytes(8))[0].toNumber();
this.channel_0_type = (this.channel_types >> 0) & 0xff;
this.channel_1_type = (this.channel_types >> 8) & 0xff;
this.channel_2_type = (this.channel_types >> 16) & 0xff;
this.channel_3_type = (this.channel_types >> 24) & 0xff;
this.format_type = (this.format >> 8) & 0xff;
this.format_variant = (this.format >> 0) & 0xff;
}
getSwizzle() {
return new BlockLinearSwizzle(this.getWidthInTexels(), this.getBytesPerTexel(), this.getBlockHeight());
}
getWidthInTexels() {
switch (this.format_type) {
case TEXTURE_FORMAT_TYPES.BC1:
case TEXTURE_FORMAT_TYPES.BC2:
case TEXTURE_FORMAT_TYPES.BC3:
case TEXTURE_FORMAT_TYPES.BC4:
case TEXTURE_FORMAT_TYPES.BC5:
case TEXTURE_FORMAT_TYPES.ASTC4x4:
return (this.width + 3) / 4;
case TEXTURE_FORMAT_TYPES.ASTC5x4:
case TEXTURE_FORMAT_TYPES.ASTC5x5:
return (this.width + 4) / 5;
case TEXTURE_FORMAT_TYPES.ASTC6x5:
case TEXTURE_FORMAT_TYPES.ASTC6x6:
return (this.width + 5) / 6;
case TEXTURE_FORMAT_TYPES.ASTC8x5:
case TEXTURE_FORMAT_TYPES.ASTC8x6:
case TEXTURE_FORMAT_TYPES.ASTC8x8:
return (this.width + 7) / 8;
case TEXTURE_FORMAT_TYPES.ASTC10x5:
case TEXTURE_FORMAT_TYPES.ASTC10x6:
case TEXTURE_FORMAT_TYPES.ASTC10x8:
case TEXTURE_FORMAT_TYPES.ASTC10x10:
return (this.width + 9) / 10;
case TEXTURE_FORMAT_TYPES.ASTC12x10:
case TEXTURE_FORMAT_TYPES.ASTC12x12:
return (this.width + 11) / 12;
}
return this.width;
}
getPow2HeightInTexels() {
const pow_2_height = Math.pow(this.height, 2);
switch (this.format_type) {
case TEXTURE_FORMAT_TYPES.BC1:
case TEXTURE_FORMAT_TYPES.BC2:
case TEXTURE_FORMAT_TYPES.BC3:
case TEXTURE_FORMAT_TYPES.BC4:
case TEXTURE_FORMAT_TYPES.BC5:
case TEXTURE_FORMAT_TYPES.ASTC4x4:
case TEXTURE_FORMAT_TYPES.ASTC5x4:
return (pow_2_height + 3) / 4;
case TEXTURE_FORMAT_TYPES.ASTC5x5:
case TEXTURE_FORMAT_TYPES.ASTC6x5:
case TEXTURE_FORMAT_TYPES.ASTC8x5:
return (pow_2_height + 4) / 5;
case TEXTURE_FORMAT_TYPES.ASTC6x6:
case TEXTURE_FORMAT_TYPES.ASTC8x6:
case TEXTURE_FORMAT_TYPES.ASTC10x6:
return (pow_2_height + 5) / 6;
case TEXTURE_FORMAT_TYPES.ASTC8x8:
case TEXTURE_FORMAT_TYPES.ASTC10x8:
return (pow_2_height + 7) / 8;
case TEXTURE_FORMAT_TYPES.ASTC10x10:
case TEXTURE_FORMAT_TYPES.ASTC12x10:
return (pow_2_height + 9) / 10;
case TEXTURE_FORMAT_TYPES.ASTC12x12:
return (pow_2_height + 11) / 12;
}
return pow_2_height;
}
getBytesPerTexel() {
switch (this.format_type) {
case TEXTURE_FORMAT_TYPES.R5G6B5:
case TEXTURE_FORMAT_TYPES.R8G8:
case TEXTURE_FORMAT_TYPES.R16:
return 2;
case TEXTURE_FORMAT_TYPES.R8G8B8A8:
case TEXTURE_FORMAT_TYPES.R11G11B10:
case TEXTURE_FORMAT_TYPES.R32:
return 4;
case TEXTURE_FORMAT_TYPES.BC1:
case TEXTURE_FORMAT_TYPES.BC4:
return 8;
case TEXTURE_FORMAT_TYPES.BC2:
case TEXTURE_FORMAT_TYPES.BC3:
case TEXTURE_FORMAT_TYPES.BC5:
case TEXTURE_FORMAT_TYPES.ASTC4x4:
case TEXTURE_FORMAT_TYPES.ASTC5x4:
case TEXTURE_FORMAT_TYPES.ASTC5x5:
case TEXTURE_FORMAT_TYPES.ASTC6x5:
case TEXTURE_FORMAT_TYPES.ASTC6x6:
case TEXTURE_FORMAT_TYPES.ASTC8x5:
case TEXTURE_FORMAT_TYPES.ASTC8x6:
case TEXTURE_FORMAT_TYPES.ASTC8x8:
case TEXTURE_FORMAT_TYPES.ASTC10x5:
case TEXTURE_FORMAT_TYPES.ASTC10x6:
case TEXTURE_FORMAT_TYPES.ASTC10x8:
case TEXTURE_FORMAT_TYPES.ASTC10x10:
case TEXTURE_FORMAT_TYPES.ASTC12x10:
case TEXTURE_FORMAT_TYPES.ASTC12x12:
return 16;
}
throw new Error(`Texture format ${this.format_type} not implemented`);
}
getBlockHeight() {
return 1 << this.block_height_log_2;
}
}
class BlockLinearSwizzle {
constructor(width, bpp, block_height = 16) {
this.bh_mask = (block_height * 8) - 1;
this.bh_shift = this.countLsbZeros(block_height * 8);
this.bpp_shift = this.countLsbZeros(bpp);
const GOD_width = Math.ceil(width * bpp / 64.00);
this.stride = 512 * block_height * GOD_width;
this.x_shift = this.countLsbZeros(512 * block_height);
}
countLsbZeros(val) {
let count = 0;
while (((val >> count) & 1) == 0) {
count++;
}
return count;
}
getSwizzleOffset(x, y) {
x <<= this.bpp_shift;
let pos = (y >> this.bh_shift) * this.stride;
pos += (x >> 6) << this.x_shift;
pos += ((y & this.bh_mask) >> 3) << 9;
pos += ((x & 0x3f) >> 5) << 8;
pos += ((y & 0x07) >> 1) << 6;
pos += ((x & 0x1f) >> 4) << 5;
pos += ((y & 0x01) >> 0) << 4;
pos += ((x & 0x0f) >> 0) << 0;
return pos;
}
}
module.exports = BNTX;