1 files changed, 98 insertions, 0 deletions
diff --git a/sys/src/lib.rs b/sys/src/lib.rs
new file mode 100644
index 0000000..f3fae9c
--- /dev/null
+++ b/sys/src/lib.rs
@@ -0,0 +1,98 @@
+use std::ffi::{c_uchar, c_uint, c_void};
+use std::os::raw::c_char;
+
+mod renderer;
+mod window;
+
+pub use renderer::Renderer;
+pub use window::{Window, WindowConfig, WindowEvent};
+
+type CRenderer = *mut ();
+type CWindow = *mut ();
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[repr(C)]
+pub struct RendererConfig {
+	pub width: c_uint,
+	pub height: c_uint,
+	pub instance_capacity: c_uint,
+	pub fullscreen: bool,
+	pub vsync: bool,
+}
+
+#[repr(C)]
+pub struct Vertex {
+	x: f32,
+	y: f32,
+	z: f32,
+	curve_a: f32,
+	curve_b: f32,
+	color1_r: f32,
+	color1_g: f32,
+	color1_b: f32,
+	color1_a: f32,
+	normal_x: f32,
+	normal_y: f32,
+	normal_z: f32,
+}
+
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+struct CWindowConfig {
+	default_width: c_uint,
+	default_height: c_uint,
+	default_x: c_uint,
+	default_y: c_uint,
+	title: *const c_char,
+	visible: bool,
+	borderless_fullscreen: bool,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[repr(C)]
+pub enum CWindowEvent {
+	AboutToWait,
+	Other,
+	CloseRequest,
+	ScaleFactorChange,
+	Resume,
+	RedrawRequest,
+}
+
+#[link(name = "alligator_backend", kind = "static")]
+extern "C" {
+	fn new_renderer(config: RendererConfig, window: CWindow) -> CRenderer;
+	fn resize_renderer(renderer: CRenderer, width: c_uint, height: c_uint);
+	fn set_vsync(renderer: CRenderer, vsync: bool);
+	fn create_vertex_buffer(renderer: CRenderer, count: c_uint, instances: *const Vertex);
+	fn set_camera(
+		renderer: CRenderer,
+		x: f32,
+		y: f32,
+		zoom: f32,
+		rotation: f32,
+		width: f32,
+		height: f32,
+	);
+	fn render_frame(renderer: CRenderer);
+	fn destroy_renderer(renderer: CRenderer);
+
+	fn create_window(config: CWindowConfig) -> CWindow;
+	fn set_visible(window: CWindow, visible: bool);
+	fn resize_window(window: CWindow, width: c_uint, height: c_uint);
+	fn set_fullscreen(window: CWindow, fullscreen: bool);
+	fn set_title(window: CWindow, title: *const c_char);
+	fn wait_for_event(window: CWindow);
+	fn pop_event(window: CWindow) -> bool;
+	fn wait_for_resume(window: CWindow);
+	fn set_event_handler(window: CWindow, closure: *mut c_void);
+	fn run_event_handler(window: CWindow, event: CWindowEvent);
+	fn request_redraw(window: CWindow);
+	fn destroy_window(window: CWindow);
+}
+
+#[no_mangle]
+unsafe extern "C" fn alligator_run_closure(closure: *mut c_void, event: CWindowEvent) {
+	let closure: &mut &mut dyn FnMut(CWindowEvent) = unsafe { &mut *closure.cast() };
+	closure(event)
+}