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fix(input): mouse_dx/dy report no motion on the first frame or across a cursor-mode change

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The delta was this frame's position minus the last, and the last started at 0,0, so the
first frame reported the cursor's whole distance from the corner as motion. A cursor-mode
change did the same, switching between a locked cursor's virtual reticle and the real
cursor. Maroon Lake's camera adds mouse_dy to its pitch and came up pointing at the ground.

examples/library/input_mouse_rebase.ludic covers both cases, plus ordinary motion and
re-setting the mode already in force.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-14 15:35:26 +03:00
parent dc9138846f
commit 28e8769a8b
4 changed files with 62 additions and 0 deletions
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9
runtime/native/input.ludic
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@ -226,6 +226,10 @@ var in_mdy: int = 0
var in_rdx: int = 0 # the raw motion the platform reports while captured
var in_rdy: int = 0
var in_cursor_mode: int = 0
# the next commit reports no mouse delta: true before the first position is read (the previous one
# is not a position, it is 0,0) and after a cursor-mode change (the position source switches between
# the virtual reticle and the real cursor, which are unrelated points)
var in_mouse_rebase: bool = true
var in_mbtn: int = 0 # button bitmask (bit 0 left, 1 right, 2 middle)
var in_wheel: int = 0 # wheel delta this frame
# gamepads: connected flag, button bitmask, and IN_AXES fixed axes each
@ -341,6 +345,10 @@ function input_device_commit(k: int, replaying: int) -> void {
in_mdy = in_my - in_my0
# captured (mode 2): the cursor is a clamped reticle, the motion is the raw delta
if is_windowed() and in_cursor_mode == 2 { in_mdx = in_rdx; in_mdy = in_rdy }
# No motion on the first frame or across a cursor-mode change. The previous position there is
# 0,0 or a point in another coordinate source, so the difference is the cursor's whole distance
# from it: a camera that adds mouse_dy to its pitch came up pointing at the ground.
if in_mouse_rebase { in_mdx = 0; in_mdy = 0; in_mouse_rebase = false }
in_mx0 = in_mx
in_my0 = in_my
}
@ -445,6 +453,7 @@ enum CursorMode { Normal, Hidden, Locked, Confined } # Input.cursor_mode(mode:
enum PadButton { A, B, X, Y, LeftShoulder, RightShoulder, Back, Start } # Input.bind_pad(button:) / pad_button
enum MouseButton { Left, Right, Middle } # Input.mouse_down(button:)
function input_cursor_mode(mode: int) -> void {
if mode != in_cursor_mode { in_mouse_rebase = true }
in_cursor_mode = mode
if is_windowed() { win_cursor_mode(mode) }
}