[gl4java-usergroup] finally found the way to get correct alpha

[Alban C. <aco...@mi...>]

Hello,

I finally found out I was mistaken loading alpha channel, and as usual this
gl4java is made by too damn good programmers !!!

I was in fact using a dangerous approach specifying the image format with
hard coding :

gl=2EglTexImage2D(gl=2EGL_TEXTURE_2D,0,3,texLoader=2EgetImageWidth(),texLoad=
er=2Eget
ImageHeight(),0,  gl=2EGL_RGB  ,gl=2EGL_UNSIGNED_BYTE,texLoader=2EgetTexture=
());

And there was my mistake, I had two functions loading textures, and didn't
figure the one my program was using was the one with GL_RGB hard coded ! So
when loading a RGBA image, it was in fact considered as RGB and my pixels
were all messed up=2E


A much smarter approach is to let the loader decide of the format of the
file, replacing GL_RGB by texLoader=2EgetGLFormat()

So a smart glTexImage2D function looks like this :

gl=2EglTexImage2D(gl=2EGL_TEXTURE_2D,0,3,texLoader=2EgetImageWidth(),texLoad=
er=2Eget
ImageHeight(),0,texLoader=2EgetGLFormat(),gl=2EGL_UNSIGNED_BYTE,texLoader=2E=
getTex
ture());


Hope this can be usefull for everybody,

Regards,

Alban Cousini=E9
http://www=2Emind2machine=2Ecom
tel : +33 491 246 734
fax : +33 491 246 702