nightshade 0.13.0

A cross-platform data-oriented game engine.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169

use openxr as xr;

#[derive(Clone)]
pub struct XrInput {
    pub thumbstick: nalgebra_glm::Vec2,
    pub right_thumbstick: nalgebra_glm::Vec2,
    pub left_trigger: f32,
    pub right_trigger: f32,
    pub left_grip: f32,
    pub right_grip: f32,
    pub a_button: bool,
    pub b_button: bool,
    pub left_thumbstick_click: bool,
    pub left_hand_pose: Option<xr::Posef>,
    pub right_hand_pose: Option<xr::Posef>,
    pub player_position: nalgebra_glm::Vec3,
    pub player_yaw: f32,
    pub head_yaw: f32,
    pub head_position: nalgebra_glm::Vec3,
    pub head_orientation: nalgebra_glm::Quat,
}

impl Default for XrInput {
    fn default() -> Self {
        Self {
            thumbstick: nalgebra_glm::vec2(0.0, 0.0),
            right_thumbstick: nalgebra_glm::vec2(0.0, 0.0),
            left_trigger: 0.0,
            right_trigger: 0.0,
            left_grip: 0.0,
            right_grip: 0.0,
            a_button: false,
            b_button: false,
            left_thumbstick_click: false,
            left_hand_pose: None,
            right_hand_pose: None,
            player_position: nalgebra_glm::vec3(0.0, 0.0, 0.0),
            player_yaw: 0.0,
            head_yaw: 0.0,
            head_position: nalgebra_glm::vec3(0.0, 0.0, 0.0),
            head_orientation: nalgebra_glm::quat_identity(),
        }
    }
}

impl XrInput {
    pub fn left_trigger_pressed(&self) -> bool {
        self.left_trigger > 0.5
    }

    pub fn right_trigger_pressed(&self) -> bool {
        self.right_trigger > 0.5
    }

    pub fn left_grip_pressed(&self) -> bool {
        self.left_grip > 0.5
    }

    pub fn right_grip_pressed(&self) -> bool {
        self.right_grip > 0.5
    }

    pub fn a_button_pressed(&self) -> bool {
        self.a_button
    }

    pub fn b_button_pressed(&self) -> bool {
        self.b_button
    }

    fn raw_quat(pose: &xr::Posef) -> nalgebra_glm::Quat {
        nalgebra_glm::quat(
            pose.orientation.w,
            pose.orientation.z,
            pose.orientation.y,
            pose.orientation.x,
        )
    }

    fn aim_rotation(&self, pose: &xr::Posef) -> nalgebra_glm::Quat {
        let player_rotation =
            nalgebra_glm::quat_angle_axis(self.player_yaw, &nalgebra_glm::vec3(0.0, 1.0, 0.0));
        player_rotation * Self::raw_quat(pose)
    }

    pub fn left_hand_aim_rotation(&self) -> Option<nalgebra_glm::Quat> {
        self.left_hand_pose.map(|pose| self.aim_rotation(&pose))
    }

    pub fn right_hand_aim_rotation(&self) -> Option<nalgebra_glm::Quat> {
        self.right_hand_pose.map(|pose| self.aim_rotation(&pose))
    }

    pub fn left_hand_aim_direction(&self) -> Option<nalgebra_glm::Vec3> {
        self.left_hand_aim_rotation()
            .map(|rot| nalgebra_glm::quat_rotate_vec3(&rot, &nalgebra_glm::vec3(0.0, 0.0, 1.0)))
    }

    pub fn right_hand_aim_direction(&self) -> Option<nalgebra_glm::Vec3> {
        self.right_hand_aim_rotation()
            .map(|rot| nalgebra_glm::quat_rotate_vec3(&rot, &nalgebra_glm::vec3(0.0, 0.0, 1.0)))
    }

    pub fn left_hand_position(&self) -> Option<nalgebra_glm::Vec3> {
        self.left_hand_pose.map(|pose| {
            let local_x = -pose.position.x;
            let local_z = -pose.position.z;
            let rotated_x = local_x * self.player_yaw.cos() + local_z * self.player_yaw.sin();
            let rotated_z = -local_x * self.player_yaw.sin() + local_z * self.player_yaw.cos();
            nalgebra_glm::vec3(
                rotated_x + self.player_position.x,
                pose.position.y + self.player_position.y,
                rotated_z + self.player_position.z,
            )
        })
    }

    pub fn right_hand_position(&self) -> Option<nalgebra_glm::Vec3> {
        self.right_hand_pose.map(|pose| {
            let local_x = -pose.position.x;
            let local_z = -pose.position.z;
            let rotated_x = local_x * self.player_yaw.cos() + local_z * self.player_yaw.sin();
            let rotated_z = -local_x * self.player_yaw.sin() + local_z * self.player_yaw.cos();
            nalgebra_glm::vec3(
                rotated_x + self.player_position.x,
                pose.position.y + self.player_position.y,
                rotated_z + self.player_position.z,
            )
        })
    }

    pub fn left_hand_rotation(&self) -> Option<nalgebra_glm::Quat> {
        self.left_hand_pose.map(|pose| {
            let openxr_orientation = pose.orientation;
            let openxr_quat = nalgebra_glm::quat(
                openxr_orientation.w,
                openxr_orientation.z,
                openxr_orientation.y,
                openxr_orientation.x,
            );
            let flip_x = nalgebra_glm::quat_angle_axis(
                180.0_f32.to_radians(),
                &nalgebra_glm::vec3(1.0, 0.0, 0.0),
            );
            let player_rotation =
                nalgebra_glm::quat_angle_axis(self.player_yaw, &nalgebra_glm::vec3(0.0, 1.0, 0.0));
            player_rotation * flip_x * openxr_quat
        })
    }

    pub fn right_hand_rotation(&self) -> Option<nalgebra_glm::Quat> {
        self.right_hand_pose.map(|pose| {
            let openxr_orientation = pose.orientation;
            let openxr_quat = nalgebra_glm::quat(
                openxr_orientation.w,
                openxr_orientation.z,
                openxr_orientation.y,
                openxr_orientation.x,
            );
            let flip_x = nalgebra_glm::quat_angle_axis(
                180.0_f32.to_radians(),
                &nalgebra_glm::vec3(1.0, 0.0, 0.0),
            );
            let player_rotation =
                nalgebra_glm::quat_angle_axis(self.player_yaw, &nalgebra_glm::vec3(0.0, 1.0, 0.0));
            player_rotation * flip_x * openxr_quat
        })
    }
}