//! ----------------------------------------------------
//! ----------------------------------------------------

const std = @import("std");
const gtl = @import("gtl");
const Material = @import("../../common/component/material.zig");
const Mesh = @import("../../cache/resource/mesh_cache.zig").MeshID;
const Handle = gtl.Handle;
const Self = @This();

// TODO:
const Camera = struct {};

/// ----------------------------------------------------
/// ----------------------------------------------------
pub const DrawCMD = union(enum) {
    draw: struct {
        mesh: Mesh,
        material: Material.Unique,
    },

    draw_indexed: struct {
        mesh: Mesh,
        material: Material.Unique,
    },

    begin_pass: struct {
        camera: Handle(Camera),
        color: [4]f32 = .{ 0, 0, 0, 255 },
    },

    end_pass,
};

//
// FIELDS
//

commands: std.ArrayList(DrawCMD),
alloc: std.mem.Allocator,

/// ----------------------------------------------------
/// ----------------------------------------------------
pub fn init(alloc: std.mem.Allocator) Self {
    return .{
        .commands = .empty,
        .alloc = alloc,
    };
}

/// ----------------------------------------------------
/// ----------------------------------------------------
pub fn deinit(self: *Self) void {
    self.commands.deinit(self.alloc);
}

/// ----------------------------------------------------
/// ----------------------------------------------------
pub fn clear(self: *Self) void {
    self.commands.clearRetainingCapacity();
}

/// ----------------------------------------------------
/// ----------------------------------------------------
pub fn draw(
    self: *Self,
    cmd: DrawCMD,
) !void {
    try self.commands.append(
        self.alloc,
        cmd,
    );
}