rust/lib-hedgewars-engine/src/lib.rs
author unc0rr
Fri, 22 Mar 2019 21:29:10 +0100
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child 14854 aed75d439027
permissions -rw-r--r--
Allow to move camera around
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pub mod instance;
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pub mod ipc;
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mod render;
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mod world;
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use std::{
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    ffi::CString,
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    io::{Read, Write},
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    mem::replace,
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    os::raw::{c_char, c_void},
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};
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use integral_geometry::Point;
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use self::instance::EngineInstance;
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#[repr(C)]
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#[derive(Copy, Clone)]
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pub struct PreviewInfo {
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    width: u32,
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    height: u32,
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    hedgehogs_number: u8,
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    land: *const u8,
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}
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#[no_mangle]
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pub extern "C" fn hedgewars_engine_protocol_version() -> u32 {
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}
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#[no_mangle]
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pub extern "C" fn start_engine() -> *mut EngineInstance {
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    let engine_state = Box::new(EngineInstance::new());
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    Box::leak(engine_state)
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}
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#[no_mangle]
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pub extern "C" fn generate_preview(engine_state: &mut EngineInstance, preview: &mut PreviewInfo) {
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    (*engine_state).process_ipc_queue();
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    (*engine_state).world.generate_preview();
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    if let Some(land_preview) = (*engine_state).world.preview() {
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        *preview = PreviewInfo {
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            width: land_preview.width() as u32,
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            height: land_preview.height() as u32,
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            hedgehogs_number: 0,
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            land: land_preview.raw_pixels().as_ptr(),
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        };
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    }
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}
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#[no_mangle]
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pub extern "C" fn dispose_preview(engine_state: &mut EngineInstance, preview: &mut PreviewInfo) {
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    (*engine_state).world.dispose_preview();
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}
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#[no_mangle]
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pub extern "C" fn send_ipc(engine_state: &mut EngineInstance, buf: *const u8, size: usize) {
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    unsafe {
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        (*engine_state)
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            .ipc
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            .write(std::slice::from_raw_parts(buf, size))
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            .unwrap();
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    }
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}
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#[no_mangle]
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pub extern "C" fn read_ipc(engine_state: &mut EngineInstance, buf: *mut u8, size: usize) -> usize {
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    unsafe {
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        (*engine_state)
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            .ipc
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            .read(std::slice::from_raw_parts_mut(buf, size))
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            .unwrap_or(0)
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    }
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}
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#[no_mangle]
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pub extern "C" fn setup_current_gl_context(
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    engine_state: &mut EngineInstance,
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    width: u16,
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    height: u16,
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    gl_loader: extern "C" fn(*const c_char) -> *const c_void,
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) {
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    gl::load_with(|name| {
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        let c_name = CString::new(name).unwrap();
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        gl_loader(c_name.as_ptr())
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    });
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    unsafe {
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        gl::Viewport(0, 0, width as i32, height as i32);
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    }
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    engine_state.world.create_renderer(width, height);
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}
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#[no_mangle]
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pub extern "C" fn render_frame(engine_state: &mut EngineInstance) {
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    engine_state.render()
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}
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#[no_mangle]
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pub extern "C" fn advance_simulation(engine_state: &mut EngineInstance, ticks: u32) -> bool {
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    engine_state.world.step();
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    true
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}
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#[no_mangle]
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pub extern "C" fn move_camera(engine_state: &mut EngineInstance, delta_x: i32, delta_y: i32) {
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    engine_state
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        .world
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        .move_camera(Point::new(delta_x, delta_y), 0.0);
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}
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#[no_mangle]
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pub extern "C" fn cleanup(engine_state: *mut EngineInstance) {
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    unsafe {
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        Box::from_raw(engine_state);
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    }
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}