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glfw: ziggify Joystick hat bitmasks

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Helps hexops/mach#37

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2021-10-30 12:04:41 -07:00 • committed by Stephen Gutekanst
parent 210e12a437
commit 32fa90eca9
3 changed files with 66 additions and 31 deletions
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39
glfw/src/Joystick.zig
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@ -12,6 +12,7 @@ const getError = @import("errors.zig").getError;
const Action = @import("action.zig").Action;
const GamepadAxis = @import("gamepad_axis.zig").GamepadAxis;
const GamepadButton = @import("gamepad_button.zig").GamepadButton;
const Hat = @import("hat.zig").Hat;
const Joystick = @This();
@ -153,25 +154,24 @@ pub inline fn getButtons(self: Joystick) Error!?[]const u8 {
/// This function returns the state of all hats of the specified joystick. Each element in the array
/// is one of the following values:
///
/// | Name | Value |
/// |-----------------------|-------------------------------------|
/// | `glfw.hat.centered` | 0 |
/// | `glfw.hat.u[` | 1 |
/// | `glfw.hat.right` | 2 |
/// | `glfw.hat.down` | 4 |
/// | `glfw.hat.left` | 8 |
/// | `glfw.hat.right_up` | `glfw.hat.right` \| `glfw.hat.up` |
/// | `glfw.hat.right_down` | `glfw.hat.right` \| `glfw.hat.down` |
/// | `glfw.hat.left_up` | `glfw.hat.left` \| `glfw.hat.up` |
/// | `glfw.hat.left_down` | `glfw.hat.left` \| `glfw.hat.down` |
/// | Name | Value |
/// |---------------------------|---------------------------------------------|
/// | `glfw.RawHats.centered` | 0 |
/// | `glfw.RawHats.up` | 1 |
/// | `glfw.RawHats.right` | 2 |
/// | `glfw.RawHats.down` | 4 |
/// | `glfw.RawHats.left` | 8 |
/// | `glfw.RawHats.right_up` | `glfw.RawHats.right` \| `glfw.RawHats.up` |
/// | `glfw.RawHats.right_down` | `glfw.RawHats.right` \| `glfw.RawHats.down` |
/// | `glfw.RawHats.left_up` | `glfw.RawHats.left` \| `glfw.RawHats.up` |
/// | `glfw.RawHats.left_down` | `glfw.RawHats.left` \| `glfw.RawHats.down` |
///
/// The diagonal directions are bitwise combinations of the primary (up, right, down and left)
/// directions and you can test for these individually by ANDing it with the corresponding
/// direction.
/// directions, since the Zig GLFW wrapper returns a packed struct it is trivial to test for these:
///
/// ```
/// if (hats[2] & glfw.hat.right) {
/// // State of hat 2 could be right-up, right, or right-down.
/// if (hats.up and hats.right) {
/// // up-right!
/// }
/// ```
///
@ -189,12 +189,13 @@ pub inline fn getButtons(self: Joystick) Error!?[]const u8 {
/// @thread_safety This function must only be called from the main thread.
///
/// see also: joystick_hat
pub inline fn getHats(self: Joystick) Error!?[]const u8 {
pub inline fn getHats(self: Joystick) Error!?[]const Hat {
var count: c_int = undefined;
const hats = c.glfwGetJoystickHats(self.jid, &count);
try getError();
if (hats == null) return null;
return hats[0..@intCast(usize, count)];
const slice = hats[0..@intCast(usize, count)];
return @ptrCast(*const []const Hat, &slice).*;
}
/// Returns the name of the specified joystick.
@ -472,6 +473,10 @@ test "getHats" {
const joystick = glfw.Joystick{ .jid = glfw.Joystick.one };
_ = joystick.getHats() catch |err| std.debug.print("failed to get joystick hats, joysticks not supported? error={}\n", .{err});
const hats = std.mem.zeroes(Hat);
if (hats.down and hats.up) {
// down-up!
}
}
test "getName" {