GLES3: Reset anisotropic filtering when changing texture filtering mode

[LRFLEW]

This fixes #79567. This is simply the part of the code change from #79367 that relates to anisotropic filtering. The existing implementation of Texture::gl_set_filter() only calls glTexParameterf with _GL_TEXTURE_MAX_ANISOTROPY_EXT when anisotropic filter is enabled. This has the problem that it won't ever disable anisotropic filtering when switching to a filtering mode that doesn't use it. This PR simply makes it so that it calls it with a value of 1.0f when disabling anisotropic filtering.

This PR targets the master branch, but it should be safe to cherry-pick for a 4.1.X release.

[clayjohn]

Looks great!

[LRFLEW]

I just noticed something. This is more stylistic than functional, so it isn't a major issue, but I still wanted to bring it up. Should I change float anisotropy to GLfloat anisotropy? Using GLfloat would match the other variables in the function, but both would work basically the same in this context (even for platforms where they aren't the same type, which I don't think Godot even supports). Notably, config->anisotropic_level is a float, not GLfloat, so either way there would be an implicit conversion from float to GLfloat.

[LRFLEW]

Just a heads up, this PR may interact with #79685, and may need a rebase if that gets merged first.

[clayjohn]

I just noticed something. This is more stylistic than functional, so it isn't a major issue, but I still wanted to bring it up. Should I change float anisotropy to GLfloat anisotropy? Using GLfloat would match the other variables in the function, but both would work basically the same in this context (even for platforms where they aren't the same type, which I don't think Godot even supports). Notably, config->anisotropic_level is a float, not GLfloat, so either way there would be an implicit conversion from float to GLfloat.

That's fine GLfloat is just a typdef for float.

[YuriSizov]

Thanks! And congrats on your first merged Godot PR!

[YuriSizov]

Cherry-picked for 4.1.2.