Texture filtering: Is the minification or the magnification filter used when rendering at the exact texture size?

Question

Suppose you have a texture where the minification filter is linear, but the magnification filter is nearest-neighbor (point filtering). If the texture is rendered at exactly 1:1 pixels, but at a non-whole-number pixel position, it is being neither minified or magnified.

Is there a convention for whether the min or mag filter will be used? What is the justification?

Answer 1

The OpenGL documentation specifies that OpenGL uses the magnification filter.

The texture magnification function is used when the pixel being textured maps to an area less than or equal to one texture element.

https://www.khronos.org/opengles/sdk/docs/man/xhtml/glTexParameter.xml

I couldn't find any such documentation for Direct3D so if someone can confirm the D3D behavior it would be helpful.