I'm trying to implement Hi-Z Screen-Space Cone-Traced Reflections using Direct3D9. I already know how to render to specific mip-level texture using Direct3D11, but not using Direct3D9.
Has anyone tried the same before?
How would I generate a custom mip-texture using D3D9? Not just switch between two different sized textures from system memory.
Maybe something involving StretchRect functions might work?