Drawing transparent PNGs

[blue_tomato]

I have PNG images with an alpha channel, and I want to draw them to the screen, mixing each pixel to the screen according to it's alpha value.

Anyone know how to do this using LWGL?

[napier]

The general idea is to enable alpha blending and define how you want to blend:

       GL11.glEnable(GL11.GL_BLEND);
        GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);

Load the image as RGBA pixels then draw it as a texture on a quad.

If you need more details I have a demo here
http://potatoland.org/code/gl/lwjgl_demoOrtho.zip
that draws a transparent gif over a scene.  Works the same way with a png.

Also a class http://potatoland.org/code/gl/GLImage.java
that loads png/gif/jpg as a java image then converts to RGBA for use in opengl.

[blue_tomato]

By simply enabling blend it works..