Without VK_EXT_depth_range_unrestricted a viewport depth range outside
[0, 1] threw. Minecraft (PPSA17221) draws its world with scale 1 and
offset 0 in negative-one-to-one clip space, so its depth is the raw z/w
clamped by PA_SC_VPORT_ZMIN/ZMAX. On such a device the vertex shader now
scales clip z so z/w is the console's depth, the pipeline clamps depth at
the console's bounds, and two clip distances restore the near and far
planes that depth clamping removes. Mode, scale and offset travel as
pipeline specialization constants from the draw's vertex stage info, in
both the per-draw and the registration-module path; mesh and tessellation
draws with such a range still throw.
The console's depth clamp bounds are clipped to [0, 1]: exact for a
normalized depth target or none, and reported once for a tested or
written float depth target, where a depth below 0 is stored as 0
(Minecraft clamps its float depth target to [-1, 1]). The shader
validator accepts the remap's two extra clip distances next to the one
a program may already export.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
