libgm 0.5.1

A tool for modding, unpacking and decompiling GameMaker games
Documentation 
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mod constant;
mod flags;
mod new;
mod old;

pub use constant::Constant;
pub use flags::Flags;

use crate::prelude::*;
use crate::wad::chunk::ChunkName;
use crate::wad::deserialize::reader::DataReader;
use crate::wad::elements::GMChunk;
use crate::wad::elements::GMElement;
use crate::wad::elements::texture_page_item::GMTexturePageItem;
use crate::wad::reference::GMRef;
use crate::wad::serialize::builder::DataBuilder;

/// Most (if not all) of these options are probably unused and remnant from GM8.
#[derive(Debug, Clone, Default, PartialEq, Eq)]
pub struct GMOptions {
    is_new_format: bool,
    pub flags: Flags,
    pub window_scale: i32,
    pub window_color: u32,
    pub color_depth: u32,
    pub resolution: u32,
    pub frequency: u32,
    pub vertex_sync: i32,
    pub priority: i32,
    pub back_image: Option<GMRef<GMTexturePageItem>>,
    pub front_image: Option<GMRef<GMTexturePageItem>>,
    pub load_image: Option<GMRef<GMTexturePageItem>>,
    pub load_alpha: u32,
    pub constants: Vec<Constant>,
    pub exists: bool,
}

impl GMChunk for GMOptions {
    const NAME: ChunkName = ChunkName::new("OPTN");

    fn exists(&self) -> bool {
        self.exists
    }
}

impl GMElement for GMOptions {
    fn deserialize(reader: &mut DataReader) -> Result<Self> {
        let is_new_format: bool = reader.read_u32()? == 0x8000_0000;
        reader.cur_pos -= 4;
        if is_new_format {
            new::parse(reader)
        } else {
            old::parse(reader)
        }
    }

    fn serialize(&self, builder: &mut DataBuilder) -> Result<()> {
        if self.is_new_format {
            new::build(builder, self)?;
        } else {
            old::build(builder, self);
        }
        Ok(())
    }
}