flake-engine 0.1.1

Immediate-mode game framework built on wgpu + winit
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pub mod camera3d;
pub mod camera2d;
pub mod render_target;

pub const OPENGL_TO_WGPU_MATRIX: cgmath::Matrix4<f32> = cgmath::Matrix4::from_cols(
    cgmath::Vector4::new(1.0, 0.0, 0.0, 0.0),
    cgmath::Vector4::new(0.0, 1.0, 0.0, 0.0),
    cgmath::Vector4::new(0.0, 0.0, 0.5, 0.0),
    cgmath::Vector4::new(0.0, 0.0, 0.5, 1.0),
);

pub trait Camera {
    fn matrix(&self) -> cgmath::Matrix4<f32>;
}

#[repr(C)]
#[derive(Debug, Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
pub struct CameraUniform {
    view_proj: [[f32; 4]; 4],
}

impl CameraUniform {
    pub fn new() -> Self {
        use cgmath::SquareMatrix;
        Self {
            view_proj: cgmath::Matrix4::identity().into(),
        }
    }

    pub fn update_view_proj(&mut self, camera: &impl Camera) {
        self.view_proj = (OPENGL_TO_WGPU_MATRIX * camera.matrix()).into();
    }
}