transparency in textures

OpenGL OpenGL: Basic Coding
1

I am applying textures on entity,how do I get
transparency on entity?what kind of opengl commands should I use?

2

Make sure your texture has an alpha channel. Then enable alpha testing (see glAlphaFunc) and/or blending (see glBlendFunc). If you use blending you probably want to disable zbuffer writes for the blended geometry (see glDepthMask).

3

I have problens with transparency in textures too, I load image from tiff format (having alfa channel) and loading with

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);

The image is printed ok, but the transparency are printed black, or all image are translucid.
Actualy I use blend as:

glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

I render images in 2d (no depth test) on windows 2000.

Thanks

4

Can you post your code?

5

I can solve it,
I change

glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);

to

glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

Thanks a lot