GL_ARB_texture_float on Intel Iris and Nvidia

Hi folks!

(I'm posting on the forum and also here, because maybe it's something under the hood. Hope it's okay.)

Got a problem here with some compute shaders. If I understood correctly, the issue relies on GL_ARB_texture_float extension.

On the CPU, I'm creating the textures with the internal format GL_RGBA16F.
On the compute shader, the layouts are set as rgba16.

And yet, I got nothing.

This works perfectly on two other PCs I have with AMD GPUs.
Or, if I switch to RGB8, I can see some stuff but it doesn't have the precision I need.

I'm running on the maximum supported openGL version, which because of the Intel Iris, is 4.4.
I also have the Intel Iris drivers up-to-date, and according to them the extension is supported.

When I run the glInfoExample on the Intel Iris, it says that GL_ARB_texture_float is on the available extensions. But when I run on my app, or try to enable it on the shader, it's not available.

(Edit: Also, when I do ofGLCheckExtension("GL_ARB_texture_float") it returns false.)

(Edit 2: Forgot to mention that the computeShaderTextureExample runs fine on the Intel Iris, but that just uses GL_RGBA8 and GL_R8.)

Edit 3: Same happens on Nvidia. It seems that when it’s running on openGL 2.1 the extension is enabled, but not on 3.2+.

So it seems that the change for the Programmable Renderer is disabling the extension on Intel and Nvidia. Any suggestions for a new step?

Thanks!

Begin with glInfoExample and computeShaderTextureExample on Intel Iris and Nvidia, comparing their reported extensions and texture formats. Trace the Programmable Renderer path and ofGLCheckExtension("GL_ARB_texture_float") behavior; done means explaining or correcting why GL_RGBA16F/rgba16 fails on these drivers while the examples and AMD systems work.