RAW Format loading

OpenGL Development
#1

Sorry guys, I did not know where else to post this question. There should be a General Programming group.

Anyways, maybe someone here can help me.

Working on some basic terrain, I desire to use a greyscale RAW image to use as the heightmap. However, I’m having issues loading the data. I have a piece of C code that loads RAW in the following way:


char* data;
fread(data, 1, size * size, file);

where size is the dimensions of the RAW (i.e. 128x128). I attempted to do the same in Java as follows:


Byte[] heightData = new Byte[size * size];
fis = new FileInputStream(filename);
BufferedInputStream bis = new BufferedInputStream(fis);
bis.read(heightData);

This reads the data, but the values are way off, about half are negative.

Any pointers?

Thanks.

#2

I assume you meant byte not Byte.

but anyway…

bytes are signed in java -128 to +127

#3

Use DataInputStream.readUnsignedByte() that should help.

#4

Thank you both.

That was the problem.