rust/lib-hedgewars-engine/src/lib.rs
author alfadur
Sun, 25 Nov 2018 05:52:06 +0300
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child 14299 21be7838a127
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add gfx setup ffi
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mod ipc;
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mod world;
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pub mod instance;
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use std::{
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    io::{Read, Write},
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    ffi::{CString},
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    os::raw::{c_void, c_char},
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    mem::replace
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};
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use gfx::{
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    Encoder,
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    format::Formatted,
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};
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use gfx_device_gl as gfx_gl;
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use self::instance::{
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    EngineInstance,
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    EngineGlContext
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};
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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 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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    let 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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#[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).ipc.write(std::slice::from_raw_parts(buf, size)).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(
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    engine_state: &mut EngineInstance,
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    buf: *mut u8,
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    size: usize,
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) -> usize {
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    unsafe { (*engine_state).ipc.read(std::slice::from_raw_parts_mut(buf, size)).unwrap_or(0) }
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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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    let (device, mut factory) = gfx_gl::create(|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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    let dimensions = (width, height, 1u16, gfx::texture::AaMode::Single);
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    let (render_target, depth_buffer) = gfx_gl::create_main_targets_raw(
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        dimensions,
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        gfx::format::Rgba8::get_format().0,
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        gfx::format::Depth::get_format().0
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    );
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    let mut command_buffer: Encoder<_, _> = factory.create_command_buffer().into();
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    engine_state.gl_context = Some(EngineGlContext {
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        device,
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        factory,
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        render_target: gfx::memory::Typed::new(render_target),
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        depth_buffer: gfx::memory::Typed::new(depth_buffer),
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        command_buffer
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    })
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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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    let mut context = replace(&mut engine_state.gl_context, None);
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    if let Some(ref mut c) = context {
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        engine_state.render(&mut c.command_buffer, &mut c.render_target)
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    }
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    replace(&mut engine_state.gl_context, context);
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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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}