loading textures

OpenGL Development
#1

Hello.
I’m learning with NeHe tutorials and I’ve come to loading textures. LWJGL port that CaptainJester wrote uses DevIL, but DevIL has lost support as I know and has some problems across platforms as I’ve read on lwjgl forums. My question is how to load textures now? I know how to use ImageIO and load and image… but in what format they need to be? Do I need to make some modifications on it after it is loaded or can I just use glBindTexture()? Also I’ve read that TGA is best solution for storing images for games, since it has fastest loading time. True?
Thank you.

#2

just convert any image to ARGB or BGRA, put it in a ByteBuffer and upload it, just like in the NeHe tutorials.

#3

I’ve found a neat solution… used Texture, TextureLoader classes from Kev’s space invaders tutorial. All you need to do is:

Texture = TextureLoader.getTexture(path); (note: it’s not really static, just abstraction)

and

Texture.bind()

later

But I have one problem… App crashes when using GL_LINEAR_MIPMAP_NEAREST as GL_TEXTURE_MIN_FILTER. If I comment following code it works fine, this is advanced (overloaded) getTexture().


           texture[2] = texture_loader.getTexture("Data/Crate.bmp",
                   GL11.GL_TEXTURE_2D,
                   GL11.GL_RGBA,
                   GL11.GL_LINEAR,
                   GL11.GL_LINEAR_MIPMAP_NEAREST);

Exception is thrown on Display.update(). Anybody knows why? Google wasn’t too helpful. Thank you.


org.lwjgl.opengl.OpenGLException: Invalid enum (1280)
	at org.lwjgl.opengl.Util.checkGLError(Util.java:56)
	at org.lwjgl.opengl.Display.swapBuffers(Display.java:555)
	at org.lwjgl.opengl.Display.update(Display.java:571)
	at Lesson07.run(Lesson07.java:82)
	at Lesson07.main(Lesson07.java:72)
#4

Exception was because I can’t use mipmap on MAG filter (not MIN filter as I wrote the first time)… people told me that it’s logical but I’m a noob in opengl and don’t see that :slight_smile: Shame Exception is thrown on Display.update() instead of apply filter statement.