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imgui delta time needs to use float math

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Our prior math converted to float after int which made our delta time
wrong making hovers and stuff not work.
This commit is contained in:
Mitchell Hashimoto
2026-01-27 09:25:58 -08:00
parent f85653414c
commit bdfb45bca7
2 changed files with 8 additions and 11 deletions
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7
src/apprt/embedded.zig
View File

@@ -1205,10 +1205,11 @@ pub const Inspector = struct {
// Determine our delta time
const now = try std.time.Instant.now();
io.DeltaTime = if (self.instant) |prev| delta: {
const since_ns = now.since(prev);
const since_s: f32 = @floatFromInt(since_ns / std.time.ns_per_s);
const since_ns: f64 = @floatFromInt(now.since(prev));
const ns_per_s: f64 = @floatFromInt(std.time.ns_per_s);
const since_s: f32 = @floatCast(since_ns / ns_per_s);
break :delta @max(0.00001, since_s);
} else (1 / 60);
} else (1.0 / 60.0);
self.instant = now;
}
};

12
src/apprt/gtk/class/imgui_widget.zig
View File

@@ -131,21 +131,17 @@ pub const ImguiWidget = extern struct {
/// Initialize the frame. Expects that the context is already current.
fn newFrame(self: *Self) void {
// If we can't determine the time since the last frame we default to
// 1/60th of a second.
const default_delta_time = 1 / 60;
const priv = self.private();
const io: *cimgui.c.ImGuiIO = cimgui.c.ImGui_GetIO();
// Determine our delta time
const now = std.time.Instant.now() catch unreachable;
io.DeltaTime = if (priv.instant) |prev| delta: {
const since_ns = now.since(prev);
const since_s: f32 = @floatFromInt(since_ns / std.time.ns_per_s);
const since_ns: f64 = @floatFromInt(now.since(prev));
const ns_per_s: f64 = @floatFromInt(std.time.ns_per_s);
const since_s: f32 = @floatCast(since_ns / ns_per_s);
break :delta @max(0.00001, since_s);
} else default_delta_time;
} else (1.0 / 60.0);
priv.instant = now;
}