From 0a2694e935fa8a79f1a399f2d2cbc643f8c3734e Mon Sep 17 00:00:00 2001 From: Gabriel Schneider Date: Tue, 29 Sep 2026 08:28:40 -0300 Subject: G13: Parallax, lapis's dots drift with the text at a quarter of its speed Parallax on|off (off, a pixel shell's; Chrome.fx bit 3). A body region carries its first line (Region.line, a file's scroll or a terminal's grid offset; the wire's region record grows a u32). The GUI offsets each body's page dots by a quarter of its line in rows, and of G6's glide offset while one runs, so the pattern drifts with the text and settles with it; the cell shader reads it from the instance's serial slot, whose per-cell dissolve noise G7 left unused (the dead noise code goes). Tests: a scrolled body tells its line; the shift handed to the shader is a quarter of it within the dots' period. Measured in a capture: four lines move the dots 13 px (140 px / 4 mod 22). Gates as before, goldens byte-identical. Feel review: .scratch/render/parallax/. --- src/surface.zig | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'src/surface.zig') diff --git a/src/surface.zig b/src/surface.zig index 02e4bb5d..d1ea78b1 100644 --- a/src/surface.zig +++ b/src/surface.zig @@ -370,6 +370,10 @@ pub const Region = struct { /// focus (Lift, on a spring), a notice's while Lift is on. A pixel shell /// casts a soft shadow from it; the tier it is drawn in never changes. lift: f32 = 0, + /// A body's view: the first line it shows (a file's scroll, a + /// terminal's grid offset), for what a pixel shell moves with the text + /// (G13's parallax). + line: i32 = 0, /// Cells the column-move rail takes off the right edge while it runs /// there: layers and pixel shells stop short of them, the grid does not. clip: u16 = 0, @@ -451,7 +455,7 @@ pub const Chrome = struct { /// A pixel shell's small effects: bit 0 a glow round the body's /// selection (G9, SelectionGlow), bit 1 one under the word a look-hover /// would open (G11, HoverGlow), bit 2 the bodies' edge shade (G12, - /// Occlusion). + /// Occlusion), bit 3 the page pattern's parallax (G13, Parallax). fx: u8 = 0, }; -- cgit v1.3