/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package demos.util;
import java.io.*;
import java.nio.*;
import java.nio.channels.*;
/** A reader for DirectDraw Surface (.dds) files, which are used to
describe textures. These files can contain multiple mipmap levels
in one file. This reader is currently minimal and does not support
all of the possible file formats. */
public class DDSReader {
/** Simple class describing images and data; does not encapsulate
image format information. User is responsible for transmitting
that information in another way. */
public static class ImageInfo {
private ByteBuffer data;
private int width;
private int height;
public ImageInfo(ByteBuffer data, int width, int height) {
this.data = data; this.width = width; this.height = height;
}
public int getWidth() { return width; }
public int getHeight() { return height; }
public ByteBuffer getData() { return data; }
}
private FileInputStream fis;
private FileChannel chan;
private ByteBuffer buf;
private Header header;
// FourCC codes (compression formats)
public static final int DXT1 = 0x31545844;
public static final int DXT2 = 0x32545844;
public static final int DXT3 = 0x33545844;
public static final int DXT4 = 0x34545844;
public static final int DXT5 = 0x35545844;
//
// Selected bits in header flags
//
public static final int DDSD_CAPS = 0x00000001; // Capacities are valid
public static final int DDSD_HEIGHT = 0x00000002; // Height is valid
public static final int DDSD_WIDTH = 0x00000004; // Width is valid
public static final int DDSD_PITCH = 0x00000008; // Pitch is valid
public static final int DDSD_BACKBUFFERCOUNT = 0x00000020; // Back buffer count is valid
public static final int DDSD_ZBUFFERBITDEPTH = 0x00000040; // Z-buffer bit depth is valid (shouldn't be used in DDSURFACEDESC2)
public static final int DDSD_ALPHABITDEPTH = 0x00000080; // Alpha bit depth is valid
public static final int DDSD_LPSURFACE = 0x00000800; // lpSurface is valid
public static final int DDSD_PIXELFORMAT = 0x00001000; // ddpfPixelFormat is valid
public static final int DDSD_MIPMAPCOUNT = 0x00020000; // Mip map count is valid
public static final int DDSD_LINEARSIZE = 0x00080000; // dwLinearSize is valid
public static final int DDSD_DEPTH = 0x00800000; // dwDepth is valid
public static final int DDPF_ALPHAPIXELS = 0x00000001; // Alpha channel is present
public static final int DDPF_ALPHA = 0x00000002; // Only contains alpha information
public static final int DDPF_RGB = 0x00000040; // RGB data is present
// Selected bits in DDS capabilities flags
public static final int DDSCAPS_TEXTURE = 0x00001000; // Can be used as a texture
public static final int DDSCAPS_MIPMAP = 0x00400000; // Is one level of a mip-map
// Known pixel formats
public static final int D3DFMT_UNKNOWN = 0;
public static final int D3DFMT_R8G8B8 = 20;
public static final int D3DFMT_A8R8G8B8 = 21;
public static final int D3DFMT_X8R8G8B8 = 22;
public void loadFile(String filename) throws IOException {
File file = new File(filename);
fis = new FileInputStream(filename);
chan = fis.getChannel();
buf = chan.map(FileChannel.MapMode.READ_ONLY,
0, (int) file.length());
buf.order(ByteOrder.LITTLE_ENDIAN);
header = new Header();
header.read(buf);
}
public void close() {
try {
chan.close();
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/** Test for presence/absence of surface description flags (DDSD_*) */
public boolean isSurfaceDescFlagSet(int flag) {
return ((header.flags & flag) != 0);
}
/** Test for presence/absence of pixel format flags (DDPF_*) */
public boolean isPixelFormatFlagSet(int flag) {
return ((header.pfFlags & flag) != 0);
}
/** Gets the pixel format of this texture (D3DFMT_*) based on some
heuristics. Returns D3DFMT_UNKNOWN if could not recognize the
pixel format. */
public int getPixelFormat() {
if (isPixelFormatFlagSet(DDPF_RGB)) {
if (isPixelFormatFlagSet(DDPF_ALPHAPIXELS)) {
if (getDepth() == 32 &&
header.pfRBitMask == 0x00FF0000 &&
header.pfGBitMask == 0x0000FF00 &&
header.pfBBitMask == 0x000000FF &&
header.pfABitMask == 0xFF000000) {
return D3DFMT_A8R8G8B8;
}
} else {
if (getDepth() == 24 &&
header.pfRBitMask == 0x00FF0000 &&
header.pfGBitMask == 0x0000FF00 &&
header.pfBBitMask == 0x000000FF) {
return D3DFMT_R8G8B8;
} else if (getDepth() == 32 &&
header.pfRBitMask == 0x00FF0000 &&
header.pfGBitMask == 0x0000FF00 &&
header.pfBBitMask == 0x000000FF) {
return D3DFMT_X8R8G8B8;
}
}
}
return D3DFMT_UNKNOWN;
}
/** Indicates whether this texture is compressed. */
public boolean isCompressed() {
return (getCompressionFormat() != 0);
}
/** If this surface is compressed, returns the kind of compression
used (DXT1..DXT5). */
public int getCompressionFormat() {
return header.pfFourCC;
}
/** Width of the texture (or the top-most mipmap if mipmaps are
present) */
public int getWidth() {
return header.width;
}
/** Height of the texture (or the top-most mipmap if mipmaps are
present) */
public int getHeight() {
return header.height;
}
/** Total number of bits per pixel. Only valid if DDPF_RGB is
present. For A8R8G8B8, would be 32. */
public int getDepth() {
return header.pfRGBBitCount;
}
/** Number of mip maps in the texture */
public int getNumMipMaps() {
if (!isSurfaceDescFlagSet(DDSD_MIPMAPCOUNT)) {
return 0;
}
return header.mipMapCountOrAux;
}
/** Gets the <i>i</i>th mipmap data (0..getNumMipMaps() - 1) */
public ImageInfo getMipMap(int map) {
if (isCompressed()) {
throw new RuntimeException("Sorry, compressed textures not supported yet");
}
// Figure out how far to seek
int seek = 4 + header.size;
for (int i = 0; i < map; i++) {
seek += mipMapSizeInBytes(i);
}
buf.limit(seek + mipMapSizeInBytes(map));
buf.position(seek);
ByteBuffer next = buf.slice();
buf.position(0);
buf.limit(buf.capacity());
return new ImageInfo(next, mipMapWidth(map), mipMapHeight(map));
}
/** Returns an array of ImageInfos corresponding to all mipmap
levels of this DDS file. */
public ImageInfo[] getAllMipMaps() {
int numLevels = getNumMipMaps();
if (numLevels == 0) {
numLevels = 1;
}
ImageInfo[] result = new ImageInfo[numLevels];
for (int i = 0; i < numLevels; i++) {
result[i] = getMipMap(i);
}
return result;
}
public void debugPrint() {
PrintStream tty = System.err;
tty.println("Compressed texture: " + isCompressed());
if (isCompressed()) {
int fmt = getCompressionFormat();
StringBuffer buf = new StringBuffer();
for (int i = 0; i < 4; i++) {
char c = (char) (fmt & 0xFF);
buf.append(c);
fmt = fmt >> 8;
}
tty.println("Compression format: 0x" + Integer.toHexString(getCompressionFormat()) + " (" + buf + ")");
}
tty.println("SurfaceDesc flags:");
boolean recognizedAny = false;
recognizedAny |= printIfRecognized(tty, header.flags, DDSD_CAPS, "DDSD_CAPS");
recognizedAny |= printIfRecognized(tty, header.flags, DDSD_HEIGHT, "DDSD_HEIGHT");
recognizedAny |= printIfRecognized(tty, header.flags, DDSD_WIDTH, "DDSD_WIDTH");
recognizedAny |= printIfRecognized(tty, header.flags, DDSD_PITCH, "DDSD_PITCH");
recognizedAny |= printIfRecognized(tty, header.flags, DDSD_BACKBUFFERCOUNT, "DDSD_BACKBUFFERCOUNT");
recognizedAny |= printIfRecognized(tty, header.flags, DDSD_ZBUFFERBITDEPTH, "DDSD_ZBUFFERBITDEPTH");
recognizedAny |= printIfRecognized(tty, header.flags, DDSD_ALPHABITDEPTH, "DDSD_ALPHABITDEPTH");
recognizedAny |= printIfRecognized(tty, header.flags, DDSD_LPSURFACE, "DDSD_LPSURFACE");
recognizedAny |= printIfRecognized(tty, header.flags, DDSD_PIXELFORMAT, "DDSD_PIXELFORMAT");
recognizedAny |= printIfRecognized(tty, header.flags, DDSD_MIPMAPCOUNT, "DDSD_MIPMAPCOUNT");
recognizedAny |= printIfRecognized(tty, header.flags, DDSD_LINEARSIZE, "DDSD_LINEARSIZE");
recognizedAny |= printIfRecognized(tty, header.flags, DDSD_DEPTH, "DDSD_DEPTH");
if (!recognizedAny) {
tty.println("(none)");
}
tty.println("Raw SurfaceDesc flags: 0x" + Integer.toHexString(header.flags));
tty.println("Pixel format flags:");
recognizedAny = false;
recognizedAny |= printIfRecognized(tty, header.pfFlags, DDPF_RGB, "DDPF_RGB");
recognizedAny |= printIfRecognized(tty, header.pfFlags, DDPF_ALPHA, "DDPF_ALPHA");
recognizedAny |= printIfRecognized(tty, header.pfFlags, DDPF_ALPHAPIXELS, "DDPF_ALPHAPIXELS");
if (!recognizedAny) {
tty.println("(none)");
}
tty.println("Raw pixel format flags: 0x" + Integer.toHexString(header.pfFlags));
tty.println("Depth: " + getDepth());
tty.println("Number of mip maps: " + getNumMipMaps());
int fmt = getPixelFormat();
tty.print("Pixel format: ");
switch (fmt) {
case D3DFMT_R8G8B8: tty.println("D3DFMT_R8G8B8"); break;
case D3DFMT_A8R8G8B8: tty.println("D3DFMT_A8R8G8B8"); break;
case D3DFMT_X8R8G8B8: tty.println("D3DFMT_X8R8G8B8"); break;
case D3DFMT_UNKNOWN: tty.println("D3DFMT_UNKNOWN"); break;
default: tty.println("(unknown pixel format " + fmt + ")"); break;
}
}
//----------------------------------------------------------------------
// Internals only below this point
//
private static final int MAGIC = 0x20534444;
static class Header {
int size; // size of the DDSURFACEDESC structure
int flags; // determines what fields are valid
int height; // height of surface to be created
int width; // width of input surface
int pitchOrLinearSize;
int backBufferCountOrDepth;
int mipMapCountOrAux; // number of mip-map levels requested (in this context)
int alphaBitDepth; // depth of alpha buffer requested
int reserved1; // reserved
int surface; // pointer to the associated surface memory
// NOTE: following two entries are from DDCOLORKEY data structure
// Are overlaid with color for empty cubemap faces (unused in this reader)
int colorSpaceLowValue;
int colorSpaceHighValue;
int destBltColorSpaceLowValue;
int destBltColorSpaceHighValue;
int srcOverlayColorSpaceLowValue;
int srcOverlayColorSpaceHighValue;
int srcBltColorSpaceLowValue;
int srcBltColorSpaceHighValue;
// NOTE: following entries are from DDPIXELFORMAT data structure
// Are overlaid with flexible vertex format description of vertex
// buffers (unused in this reader)
int pfSize; // size of DDPIXELFORMAT structure
int pfFlags; // pixel format flags
int pfFourCC; // (FOURCC code)
// Following five entries have multiple interpretations, not just
// RGBA (but that's all we support right now)
int pfRGBBitCount; // how many bits per pixel
int pfRBitMask; // mask for red bits
int pfGBitMask; // mask for green bits
int pfBBitMask; // mask for blue bits
int pfABitMask; // mask for alpha channel
int ddsCaps1; // Texture and mip-map flags
int ddsCaps2; // Advanced capabilities, not yet used
int ddsCapsReserved1;
int ddsCapsReserved2;
int textureStage; // stage in multitexture cascade
void read(ByteBuffer buf) throws IOException {
int magic = buf.getInt();
if (magic != MAGIC) {
throw new IOException("Incorrect magic number 0x" +
Integer.toHexString(magic) +
" (expected " + MAGIC + ")");
}
size = buf.getInt();
flags = buf.getInt();
height = buf.getInt();
width = buf.getInt();
pitchOrLinearSize = buf.getInt();
backBufferCountOrDepth = buf.getInt();
mipMapCountOrAux = buf.getInt();
alphaBitDepth = buf.getInt();
reserved1 = buf.getInt();
surface = buf.getInt();
colorSpaceLowValue = buf.getInt();
colorSpaceHighValue = buf.getInt();
destBltColorSpaceLowValue = buf.getInt();
destBltColorSpaceHighValue = buf.getInt();
srcOverlayColorSpaceLowValue = buf.getInt();
srcOverlayColorSpaceHighValue = buf.getInt();
srcBltColorSpaceLowValue = buf.getInt();
srcBltColorSpaceHighValue = buf.getInt();
pfSize = buf.getInt();
pfFlags = buf.getInt();
pfFourCC = buf.getInt();
pfRGBBitCount = buf.getInt();
pfRBitMask = buf.getInt();
pfGBitMask = buf.getInt();
pfBBitMask = buf.getInt();
pfABitMask = buf.getInt();
ddsCaps1 = buf.getInt();
ddsCaps2 = buf.getInt();
ddsCapsReserved1 = buf.getInt();
ddsCapsReserved2 = buf.getInt();
textureStage = buf.getInt();
}
}
private int mipMapWidth(int map) {
int width = getWidth();
for (int i = 0; i < map; i++) {
width >>= 1;
}
return width;
}
private int mipMapHeight(int map) {
int height = getHeight();
for (int i = 0; i < map; i++) {
height >>= 1;
}
return height;
}
private int mipMapSizeInBytes(int map) {
int width = mipMapWidth(map);
int height = mipMapHeight(map);
return width * height * (getDepth() / 8);
}
private boolean printIfRecognized(PrintStream tty, int flags, int flag, String what) {
if ((flags & flag) != 0) {
tty.println(what);
return true;
}
return false;
}
}