16 bit float texture upload

[V-man]

To upload, the only way seems to be

glTexImage2D(target, 0, GL_RGBAF16_ARB, w, h, 0, GL_RGBA, GL_HALF_FLOAT_NV, pixels);

I`m not sure why GL_HALF_FLOAT_NV hasn`t been inserted into ARB_texture_float.
I guess the alternative is GL_FLOAT but I`m pretty sure that means 32 bit float.

[sqrt[-1]]

It would also be nice to have some GLU functions to convert from float->half and half->float.

[zxmvb23]

@ V-man: Try GL_HALF_FLOAT_ARB

@ sqrt[-1]: do you know the OpenEXR library? It provides float <-> half conversions

[V-man]

I just found out about ARB_half_float_pixel which has GL_HALF_FLOAT_ARB. I don't see why they have designed it like this.
ARB_texture_float should just offer GL_HALF_FLOAT_ARB

or better yet,
ARB_texture_float (for 32 bit, if GPU can do it)
and
ARB_texture_halffloat (if GPU can do it)

and perhaps someday they can make
ARB_texture_double

PS: GLU should be updated IMO.

[arekkusu]

gluBuild*Mipmaps should support half/float.

[V-man]

gluBuild*Mipmaps should support half/float.

No need. Mipmap generation is a requirement since a long time ago so the GL drivers can generate mipmaps.

[noncopyable]

I just found out about ARB_half_float_pixel which has GL_HALF_FLOAT_ARB. I don't see why they have designed it like this.
ARB_texture_float should just offer GL_HALF_FLOAT_ARB

or better yet,
ARB_texture_float (for 32 bit, if GPU can do it)
and
ARB_texture_halffloat (if GPU can do it)

and perhaps someday they can make
ARB_texture_double

PS: GLU should be updated IMO.

The only reason i could think why they didn't include GL_HALF_FLOAT_ARB in ARB_texture_float is, Nvidia was supporting half filtering from the begining and ATI wasn't (still?), without half filtering maybe GL_HALF_FLOAT_ARB pointless?

[noncopyable]

@ V-man: Try GL_HALF_FLOAT_ARB

@ sqrt[-1]: do you know the OpenEXR library? It provides float <-> half conversions

Nvidia and OpenEXR both use same library.
But why would you need a conversion if you can't upload results to gpu? And if you can upload, you can convert your data to any format using shader, you wouldn't need any other extension/library/GLU function.

[V-man]

@ V-man: Try GL_HALF_FLOAT_ARB

@ sqrt[-1]: do you know the OpenEXR library? It provides float <-> half conversions

Nvidia and OpenEXR both use same library.
But why would you need a conversion if you can't upload results to gpu? And if you can upload, you can convert your data to any format using shader, you wouldn't need any other extension/library/GLU function.

The extension should have been properly done so that we could upload it to the GPU. This is an issue on ATI.

I don't know what you mean by "convert your data to any format using shader"

[noncopyable]

Yes, what we need is a proper support to what we have (arb_texture_float), not another library/GLU function.

By "convert your data to any format using shader", nothing special, i just mean using a shader you can convert any format to another one, for example 32bit integer to fp16 texture, or rgbe to fp16 etc.

I just don't like the idea of adding new functions to GLU, or new libraries like GLU, i just want a solid, standard, low level graphic language.