mod world;

#[repr(C)]

pub struct EngineInstance {

    world: world::World,

}

impl EngineInstance {

    pub fn new() -> Self {

        let world = world::World::new();

        Self { world }

    }

    pub fn render<R, C>(

        &self,

        context: &mut gfx::Encoder<R, C>,

        target: &gfx::handle::RenderTargetView<R, gfx::format::Rgba8>)

        where R: gfx::Resources,

              C: gfx::CommandBuffer<R>

    {

        context.clear(target, [0.0, 0.5, 0.0, 1.0]);

    }

}

#[repr(C)]

#[derive(Copy, Clone)]

pub struct PreviewInfo {

    width: u32,

    height: u32,

    hedgehogs_number: u8,

    land: *const u8,

}

#[no_mangle]

pub extern "C" fn protocol_version() -> u32 {

    56

}

#[no_mangle]

pub extern "C" fn start_engine() -> *mut EngineInstance {

    let engine_state = Box::new(EngineInstance {

        world: world::World::new(),

    });

    Box::leak(engine_state)

}

#[no_mangle]

pub extern "C" fn generate_preview(engine_state: &mut EngineInstance, preview: &mut PreviewInfo) {

    (*engine_state).world.generate_preview();

    let land_preview = (*engine_state).world.preview();

    *preview = PreviewInfo {

        width: land_preview.width() as u32,

        height: land_preview.height() as u32,

        hedgehogs_number: 0,

        land: land_preview.raw_pixels().as_ptr(),

    };

}

#[no_mangle]

pub extern "C" fn cleanup(engine_state: *mut EngineInstance) {

    unsafe {

        Box::from_raw(engine_state);

    }

}