based on this source code,
http://www.71squared.com/2009/03/iphone-...utorial-1/

i had tried to load a grayscale and loading as alpha...
what i have changed is:
in eglview, in init functions i have loaded 2 images, one grayscale, and rendered them with this gl init
in texture2d:
but what is displayed is a rectangle all white
do someone have an example od loading grayscale as alpha or can someone look this code?
example
i'm not able to find the error
thanks

I don't know, but the first thing you should do is get rid of that texEnv call. The default is


and I can't imagine why you'd use anything else.

thanks for the fast reply.
i have putted glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND_SRC);
because in other threads around the web i have found it as a fix for this problem.
however, i tried glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); and doesn't solve this problem.

strange thing:
if i load the image as a rgb without alpha, the image is displayed correcly...
i gave managed the image in photoshop, and it results (as it say) grayscale/8.
i have opened windows paint and copy/paste the image and saved as bmp, nothing changed