vrust 0.0.1

VRust game engine
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use std::mem::transmute;
use super::super::super::objc::runtime::{Object, Sel};
use super::super::super::render::engine::RenderEngine;
use super::super::super::core::application::ApplicationTrait;
use super::super::metal as mtl;
use super::application::Application as App;

pub const DEVICE_VAR_NAME: &str = "mtl_device";
pub const APP_VAR_NAME: &str = "vukust_os_app";
pub const CLASS_NAME: &str = "GameViewController";
pub const SUPER_CLASS_NAME: &str = "NSViewController";

//- (void)metalViewDidLoad
extern "C" fn metal_view_did_load<CoreApp>(this: &mut Object, _cmd: Sel)
where
    CoreApp: ApplicationTrait,
{
    let this: mtl::Id = this;
    let view: mtl::Id = unsafe { msg_send![this, view] };
    let app: *mut App<CoreApp> =
        unsafe { transmute(*(*this).get_ivar::<mtl::NSUInteger>(APP_VAR_NAME)) };
    let bounds: mtl::NSRect = unsafe { msg_send![view, bounds] };
    unsafe {
        (*(*app).render_engine).draw_rect_resized(&bounds.size);
    }
}

// Called whenever view changes orientation or layout is changed
// - (void)mtkView:(nonnull MTKView *)view drawableSizeWillChange:(CGSize)size
extern "C" fn mtl_view<CoreApp>(this: &mut Object, _cmd: Sel, view: mtl::Id, _size: mtl::NSSize)
where
    CoreApp: ApplicationTrait,
{
    let bounds: mtl::NSRect = unsafe { msg_send![view, bounds] };
    let app: *mut App<CoreApp> =
        unsafe { transmute(*(*this).get_ivar::<mtl::NSUInteger>(APP_VAR_NAME)) };
    unsafe {
        (*(*app).render_engine).draw_rect_resized(&bounds.size);
    }
}

// Called whenever the view needs to render
// - (void)drawInMTKView:(nonnull MTKView *)view
extern "C" fn draw_in_mtk_view<CoreApp>(this: &mut Object, _cmd: Sel, _view: mtl::Id)
where
    CoreApp: ApplicationTrait,
{
    let release_pool = mtl::NsAutoReleasePool::new();
    let app: &mut App<CoreApp> =
        unsafe { transmute(*this.get_ivar::<mtl::NSUInteger>(APP_VAR_NAME)) };
    let renderer: &mut RenderEngine<CoreApp> = unsafe { transmute(app.render_engine) };
    renderer.render();
    let _ = release_pool;
}

// Methods to get and set state of the our ultimate render destination (i.e. the drawable)
// # pragma mark RenderDestinationProvider implementation
// - (MTLRenderPassDescriptor*) currentRenderPassDescriptor
extern "C" fn get_current_render_pass_descriptor(this: &mut Object, _cmd: Sel) -> mtl::Id {
    let view: mtl::Id = unsafe { msg_send![this, view] };
    let desc: mtl::Id = unsafe { msg_send![view, currentRenderPassDescriptor] };
    return desc;
}

// - (MTLPixelFormat) colorPixelFormat
extern "C" fn get_color_pixel_format(this: &mut Object, _cmd: Sel) -> mtl::NSUInteger {
    let view: mtl::Id = unsafe { msg_send![this, view] };
    unsafe { msg_send![view, colorPixelFormat] }
}

// - (void) setColorPixelFormat: (MTLPixelFormat) pixelFormat
extern "C" fn set_color_pixel_format(this: &mut Object, _cmd: Sel, frmt: mtl::NSUInteger) {
    let view: mtl::Id = unsafe { msg_send![this, view] };
    unsafe {
        let _: () = msg_send![view, setColorPixelFormat: frmt];
    }
}

// - (MTLPixelFormat) depthStencilPixelFormat
extern "C" fn get_depth_stencil_pixel_format(this: &mut Object, _cmd: Sel) -> mtl::NSUInteger {
    let view: mtl::Id = unsafe { msg_send![this, view] };
    unsafe { msg_send![view, depthStencilPixelFormat] }
}

// - (void) setDepthStencilPixelFormat: (MTLPixelFormat) pixelFormat
extern "C" fn set_depth_stencil_pixel_format(this: &mut Object, _cmd: Sel, frmt: mtl::NSUInteger) {
    let view: mtl::Id = unsafe { msg_send![this, view] };
    unsafe {
        let _: () = msg_send![view, setDepthStencilPixelFormat: frmt];
    }
}

// - (NSUInteger) sampleCount
extern "C" fn get_sample_count(this: &mut Object, _cmd: Sel) -> mtl::NSUInteger {
    let view: mtl::Id = unsafe { msg_send![this, view] };
    return unsafe { msg_send![view, sampleCount] };
}

// - (void) setSampleCount:(NSUInteger) sampleCount
extern "C" fn set_sample_count(this: &mut Object, _cmd: Sel, sample_count: mtl::NSUInteger) {
    let view: mtl::Id = unsafe { msg_send![this, view] };
    unsafe {
        let _: () = msg_send![view, setSampleCount: sample_count];
    }
}

// - (id<MTLDrawable>) currentDrawable
extern "C" fn get_current_drawable(this: &mut Object, _cmd: Sel) -> mtl::Id {
    let view: mtl::Id = unsafe { msg_send![this, view] };
    return unsafe { msg_send![view, currentDrawable] };
}

pub fn register<CoreApp>()
where
    CoreApp: ApplicationTrait,
{
    let mut self_class = mtl::dec_class_s(CLASS_NAME, SUPER_CLASS_NAME);
    self_class.add_ivar::<mtl::Id>(DEVICE_VAR_NAME);
    self_class.add_ivar::<mtl::NSUInteger>(APP_VAR_NAME);

    unsafe {
        self_class.add_method(
            sel!(metalViewDidLoad),
            metal_view_did_load::<CoreApp> as extern "C" fn(&mut Object, Sel),
        );
        self_class.add_method(
            sel!(mtkView:drawableSizeWillChange:),
            mtl_view::<CoreApp> as extern "C" fn(&mut Object, Sel, mtl::Id, mtl::NSSize),
        );
        self_class.add_method(
            sel!(drawInMTKView:),
            draw_in_mtk_view::<CoreApp> as extern "C" fn(&mut Object, Sel, mtl::Id),
        );
        self_class.add_method(
            sel!(currentRenderPassDescriptor),
            get_current_render_pass_descriptor as extern "C" fn(&mut Object, Sel) -> mtl::Id,
        );
        self_class.add_method(
            sel!(colorPixelFormat),
            get_color_pixel_format as extern "C" fn(&mut Object, Sel) -> mtl::NSUInteger,
        );
        self_class.add_method(
            sel!(setColorPixelFormat:),
            set_color_pixel_format as extern "C" fn(&mut Object, Sel, mtl::NSUInteger),
        );
        self_class.add_method(
            sel!(depthStencilPixelFormat),
            get_depth_stencil_pixel_format as extern "C" fn(&mut Object, Sel) -> mtl::NSUInteger,
        );
        self_class.add_method(
            sel!(setDepthStencilPixelFormat:),
            set_depth_stencil_pixel_format as extern "C" fn(&mut Object, Sel, mtl::NSUInteger),
        );
        self_class.add_method(
            sel!(sampleCount),
            get_sample_count as extern "C" fn(&mut Object, Sel) -> mtl::NSUInteger,
        );
        self_class.add_method(
            sel!(setSampleCount:),
            set_sample_count as extern "C" fn(&mut Object, Sel, mtl::NSUInteger),
        );
        self_class.add_method(
            sel!(currentDrawable),
            get_current_drawable as extern "C" fn(&mut Object, Sel) -> mtl::Id,
        );
    }
    self_class.register();
}