tamamo/src/main.zig

const w4 = @import("wasm4.zig");
const sh0rk = @import("sh0rk.zig");
const sprites = @import("sprites.zig");
const palette = @import("palette.zig");

const Direction = sh0rk.Direction;
const Point = sh0rk.Point;
const Rect = sh0rk.Rect;

var frame_count: u32 = 0;
var mara_direction: Direction = Direction.Right;
var mara_frame: bool = false;
var mara_box: Rect = Rect{.base = Point{.x = 20, .y = 40}, .width = 16, .height = 16};
var mara_speed: i32 = 0;
var screen = Rect{.base = Point{.x = 0, .y = 0}, .width = 160, .height = 160};

var sound_timer: u8 = 0;

var textBuf: [160]u8 = undefined;

export fn start() void {
    palette.mist();
}

const map = @import("./maps/rpg.zig");

fn bonk() void {
    if (sound_timer != 0) {
        return;
    }

    w4.tone(
        w4.Tone.Frequency{.start = 220, .end = 40},
        w4.Tone.Duration{
            .attack = 0,
            .decay = 0,
            .sustain = 6,
            .release = 6,
        },
        w4.Tone.Volume{
            .sustain = 100,
            .attack = 100,
        },
        w4.Tone.Flags{
            .channel = .triangle,
            .pulse_duty = .@"1/2",
        },
    );

    sound_timer = 12;
}

fn drawMap() !void {
    w4.m.colors.* = .{
        ._0 = .p0,
        ._1 = .p1,
        ._2 = .p2,
        ._3 = .p3,
    };

    for (map.data) |tile, i| {
        const width = sprites.kenney_rpg_width / 16;
        const height = sprites.kenney_rpg_width / 16;
        var x: u32 = (i % width) * 16;
        var y: u32 = (i / height) * 16;

        w4.blitSub(
            &sprites.kenney_rpg, 
            x,
            y,
            16, 
            16,
            @intCast(u32, tile.x) * 16,
            @intCast(u32, tile.y) * 16,
            sprites.kenney_rpg_width, 
            w4.BlitFlags{.two_bits = true},
        );
    }
}

fn move_mara(gamepad: w4.GamePad) void {
    mara_speed -= 1;
    if (mara_speed < 0) {
        mara_speed = 0;
    }
    if (gamepad.up) {
        mara_direction = Direction.Up;
        mara_speed = 1;
    } else if (gamepad.down) {
        mara_direction = Direction.Down;
        mara_speed = 1;
    } else if (gamepad.left) {
        mara_direction = Direction.Left;
        mara_speed = 1;
    } else if (gamepad.right) {
        mara_direction = Direction.Right;
        mara_speed = 1;
    }

    switch (mara_direction) {
        .Up => {
            mara_box.base.y -= mara_speed;
        },
        .Down => {
            mara_box.base.y += mara_speed;
        },
        .Left => {
            mara_box.base.x -= mara_speed;
        },
        .Right => {
            mara_box.base.x += mara_speed;
        },
    }
}

export fn update() void {
    if (sound_timer != 0) {
        sound_timer -= 1;
    }

    drawMap() catch unreachable;

    // w4.m.colors._0 = .p3;
    // w4.m.colors._1 = .p0;
    // w4.text("Mara 2:\nTamamo's Fury", 10, 10);

    const gamepad = w4.m.gamepads[0];
    const old_speed = mara_speed;
    move_mara(gamepad);

    for (map.coll) |box| {
        if (mara_box.collides(box)) {
            switch (mara_direction) {
                .Up => {
                    mara_box.base.y += mara_speed;
                },
                .Down => {
                    mara_box.base.y -= mara_speed;
                },
                .Left => {
                    mara_box.base.x += mara_speed;
                },
                .Right => {
                    mara_box.base.x -= mara_speed;
                },
            }
            mara_speed = 0;
            bonk();
        }
    }

    if (mara_box.base.x < 0) {
        mara_box.base.x = 0;
    } else if (mara_box.base.x > 160 - mara_box.width) {
        mara_box.base.x = 160 - mara_box.width;
    }
    if (mara_box.base.y < 0) {
        mara_box.base.y = 0;
    } else if (mara_box.base.y > 160 - mara_box.height) {
        mara_box.base.y = 160 - mara_box.height;
    }

    var flags: w4.BlitFlags = w4.BlitFlags {
        .two_bits = true,
    };

    // w4.m.colors._0 = .p0;
    // w4.m.colors._1 = .p1;
    // w4.m.colors._2 = .p2;
    // w4.m.colors._3 = .p3;

    // w4.blit(&sprites.tamamotitle, 60, 60, sprites.tamamotitle_width, sprites.tamamotitle_height, flags);

    // w4.m.colors._0 = .p0;
    // w4.m.colors._1 = .p1;
    // w4.m.colors._2 = .p3;
    // w4.m.colors._3 = .transparent;
    
    // w4.blit(&sprites.glaceon, 100, 128, sprites.glaceon_width, sprites.glaceon_height, flags);
    
    w4.m.colors.* = .{
        ._0 = .transparent,
        ._1 = .p0,
        ._2 = .p1,
        ._3 = .p3,
    };

    if (mara_direction == Direction.Left) {
        flags.flip_x = true;
    }

    if (frame_count % 15 == 0 and mara_speed > 0) {
        mara_frame = !mara_frame;    
    }

    if (old_speed != mara_speed) {
        mara_frame = !mara_frame;
    }

    var frame: u32 = switch (mara_direction) {
        .Left => 4,
        .Right => 4,
        .Up => 2,
        .Down => 0,
    };
    var step: u32 =  if (mara_frame) 1 else 0;

    w4.blitSub(&sprites.Mara, @intCast(u32, mara_box.base.x), @intCast(u32, mara_box.base.y), 16, 16, 16 * (frame + step), 0, 96, flags);

    frame_count += 1;
}