lua图像库_libdevil: Developer's Image Library (DevIL) 是一个 Lua 的开发包，用来实现非常强大的图像加载功能...

Developer's Image Library version 1.7.8 Readme, Notes and Quick Use

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DevIL song: "la la la, a cross-platform image library utilizing a

simple syntax to load, save, convert, manipulate, filter and display

a variety of images with ease, la la la"

What is it?

-----------

DevIL is an Open Source image library whose distribution is done under the

terms of the GNU LGPL license. See the COPYING file for more details.

DevIL offers you a simple way to implement loading, manipulating, filtering,

converting, displaying, saving from/to several different image formats in your

own project.

Where can I find it?

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DevIL can be found at http://openil.sourceforge.net

How do I build and install the 3 libraries ?

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*nix users should read README.unix

VisualC users should read README.win

Cygwin users should read README.cygwin

MacOSX users should read README.macosx

PS: *nix stands for GNU/Linux, *BSD, SunOS/Solaris and perhaps some more.

More Extensive Documentation

----------------------------

This file is only a quick guide to point you to more detailed information on

how to use DevIL. More extensive documentation can currently be found on the

DevIL site at http://openil.sf.net and in the /Docs directory in a normal

install.

Why the hell another image library?

-----------------------------------

I have never seen an image library that can do everything DevIL does. Sure,

various different libraries can do part of what DevIL can do as well or even

better, but I wanted a simple to use library that encompassed all of these

features. I also wanted an extremely portable image library that could be used

from a variety of languages and utilized the OpenGL syntax.

Basic Readme

------------

Most anything stated in this document applies to DevIL as well as DevILU and

DevILUT, unless otherwise stated. (This file is best viewed with word wrap on.)

Errors:

-------

All errors generated inside DevIL, along with illegal parameters passed to

DevIL functions are caught and passed to ilSetError(), an internal library

function. The calling program can call ilGetError() to get the value of the

error generated. Error types are defined in il.h, using the 0x501 - 0x5FF

range. ilGetError() will return 0 (IL_NO_ERROR) if no error has occurred.

Basic Usage:

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This demonstrates loading an image through DevIL for OpenGL. Don't forget to

call ilInit before you before you do anything:

#include

#include

#include

...

ILuint devilError;

ilInit();

devilError = ilGetError();

if (devilError != IL_NO_ERROR) {

printf ("Devil Error (ilInit: %s\n", iluGetErrorString (devilError));

exit (2);

}

....

ILuint devilID;

ilGenImages(1, &devilID);

ilBindImage(devilID);

ilLoadImage("default1.tga"); // Loads into the current bound image

devilError = ilGetError();

if (devilError != IL_NO_ERROR) {

printf ("Devil Error (ilLoadImage: %s\n", iluGetErrorString (devilError));

exit (2);

}

....

ilutRenderer(IL_OPENGL); // Switch the renderer

....

GLuint openglID, openglError;

openglID = ilutGLBindTexImage(); // This generates the texture for you

devilError = ilGetError();

if (devilError != IL_NO_ERROR) {

printf ("Error: %s\n", iluGetErrorString (devilError));

exit (2);

}

if (openglError != GL_NO_ERROR) {

printf ("Opengl Error (ilutGLBindTexImage): %s\n", gluGetErrorString (openglError));

exit (2);

}

// Make sure to close the image when you are done with it (though DevIL

// automatically deletes them when the program exits):

glDeleteTextures(1, &openglID);

ilDeleteImages (1, &devilID);

More Examples:

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The TestIL project is included to test features of DevIL.

DevIL includes a project called GLTest. This is a simple test of DevIL's

capabilities. All it does it load any image and displays it in a window

created by FreeGlut, which is available on http://freeglut.sourceforge.net. It

is also included to let the user have an idea of what the library can really

be used for.

Several other test projects are included to test support with various display

APIs. The WindowsTest project is a basic image program that only runs in

Windows right now but showcases several of DevIL's features through various

menus.

If you want more in-depth tutorials, you can find them on

http://openil.sf.net, or they may be in your installation under the /examples

directory. Documents are also available in the /docs directory.

Additional Reading

------------------

All image formats used in DevIL have corresponding documents on

http://www.wotsit.org, under the Graphics Files section. These documents

proved invaluable for the creation of this library when there was no library

already available for that image format.

Legalese

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All contents of this file are intellectual property of Denton Woods,

copyright 2001-2008.