GL_ALPHA, GL_LUMINANCE

Question

I'm trying to bind a texture that I want to interpret as either Alpha, Luminance or Intensity. I'm using OpenGL 4.0. I can bind them as GL_RED OK with no problems, i.e. :

glTexImage2D(   GL_TEXTURE_2D,
                i,
                GL_RED,
                mipSizeX,
                mipSizeY,
                0,
                GL_RED, 
                GL_UNSIGNED_BYTE, 
                nullptr);

However whenever I try to bind as GL_ALPHA, GL_LUMINANCE or GL_INTENSITY, I get an error 1280. Are those formats deprecated with GL 4.0, or am I doing something wrong? E.g. this fails:

glTexImage2D(   GL_TEXTURE_2D,
                i,
                GL_ALPHA8
                mipSizeX,
                mipSizeY,
                0,
                GL_ALPHA, 
                GL_UNSIGNED_BYTE, 
                nullptr);

EDIT: Ok as these formats are deprecated, this page contains tables showing what the valid formats actually are.

Lilla

Answer 1

Are those formats deprecated with GL 4.0

Yes, they are.

Marieann