51 lines
1.1 KiB
Rust
51 lines
1.1 KiB
Rust
use glam::{mat4, vec3, vec4};
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use iced::Rectangle;
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#[derive(Copy, Clone)]
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pub struct Camera {
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eye: glam::Vec3,
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target: glam::Vec3,
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up: glam::Vec3,
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fov_y: f32,
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near: f32,
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far: f32,
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}
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impl Default for Camera {
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fn default() -> Self {
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Self {
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eye: vec3(0.0, 2.0, 3.0),
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target: glam::Vec3::ZERO,
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up: glam::Vec3::Y,
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fov_y: 45.0,
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near: 0.1,
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far: 100.0,
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}
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}
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}
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pub const OPENGL_TO_WGPU_MATRIX: glam::Mat4 = mat4(
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vec4(1.0, 0.0, 0.0, 0.0),
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vec4(0.0, 1.0, 0.0, 0.0),
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vec4(0.0, 0.0, 0.5, 0.0),
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vec4(0.0, 0.0, 0.5, 1.0),
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);
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impl Camera {
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pub fn build_view_proj_matrix(&self, bounds: Rectangle) -> glam::Mat4 {
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let aspect_ratio = bounds.width / bounds.height;
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let view = glam::Mat4::look_at_rh(self.eye, self.target, self.up);
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let proj = glam::Mat4::perspective_rh(
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self.fov_y,
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aspect_ratio,
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self.near,
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self.far,
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);
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OPENGL_TO_WGPU_MATRIX * proj * view
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}
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pub fn position(&self) -> glam::Vec4 {
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glam::Vec4::from((self.eye, 0.0))
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}
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}
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