Making triangle from a quad with mask

I want to make a triangle with mask from a quad.

I try to use a png with alpha channel and blend it with other quad.
But the combined output are not really transparent?
The background in the renderer still be covered by the quad.

What could I do to solve this issue?
The image and v4p file are attachced.

alpha_test.v4p (4.1 kB)

Can’t see your image, but maybe this helps.

In DX9 you don’t need to use a blend mode, alpha blending is on by default (assuming you have an alpha channel, see patch for that)

alpha_test_1.v4p (15.5 kB)

Thank you. Your example is very helpful.