ona/src/demos/graphics.zig

const ona = @import("ona");

const std = @import("std");

const CRT = extern struct {
    width: f32,
    height: f32,
    time: f32,
    padding: [4]u8 = undefined,
};

const Effects = struct {
    render_texture: ona.AssetHandle = .default,
    image_textures: [2]ona.AssetHandle = [_]ona.AssetHandle{.default} ** 2,
    last_time: f64 = 0,
    image_index: usize = 0,
    crt_effect: ona.AssetHandle = .default,
};

pub fn main() void {
    ona.realtime_app
        .with(.initModule(ona.hid))
        .with(.initModule(ona.gfx))
        // .with(.initSystem(.render, .of(render)))
        .run();
}

// fn update(effects: ona.Write(Effects), loop: ona.Read(ona.Loop)) void {
//     const update_seconds = 5;

//     if ((loop.state.elapsed_time - effects.state.last_time) > update_seconds) {
//         effects.state.image_index = (effects.state.image_index + 1) % effects.state.image_textures.len;
//         effects.state.last_time = loop.state.elapsed_time;
//     }
// }

// fn render(commands: ona.gfx.Commands) void {
//     try commands.setTarget(.{
//         .texture = effects.state.render_texture,
//         .clear_color = gfx.colors.black,
//         .clear_depth = 0,
//         .clear_stencil = 0,
//     });

//     const width: f32 = @floatFromInt(display.state.width);
//     const height: f32 = @floatFromInt(display.state.height);

//     try commands.draw_texture(.{
//         .texture = effects.state.image_textures[effects.state.image_index],
//         .size = .{ width, height },
//     });

//     try commands.set_effect(.{
//         .effect = effects.state.crt_effect,

//         .properties = std.mem.asBytes(&CRT{
//             .width = width,
//             .height = height,
//             .time = @floatCast(loop.state.elapsed_time),
//         }),
//     });

//     try commands.set_target(.{
//         .clear_color = null,
//         .clear_depth = null,
//         .clear_stencil = null,
//     });

//     try commands.draw_texture(.{
//         .texture = effects.state.render_texture,
//         .size = .{ width, height },
//     });
// }