Loading mesh metadata

src/main.rs

@@ -15,28 +15,144 @@ use std::io::Read;
 use std::path::Path;
 use std::time::Duration;
 
-pub struct Iqm {
-	version: u32,
-	filesize: u32,
-	flags: u32,
+mod iqm_consts {
+	pub const VERSION: usize           =  0;
+	pub const FILESIZE: usize          =  1;
+	pub const FLAGS: usize             =  2;
+	pub const NUM_TEXT: usize          =  3;
+	pub const OFS_TEXT: usize          =  4;
+	pub const NUM_MESHES: usize        =  5;
+	pub const OFS_MESHES: usize        =  6;
+	pub const NUM_VERTEXARRAYS: usize  =  7;
+	pub const NUM_VERTEXES: usize      =  8;
+	pub const OFS_VERTEXARRAYS: usize  =  9;
+	pub const NUM_TRIANGLES: usize     = 10;
+	pub const OFS_TRIANGLES: usize     = 11;
+	pub const OFS_ADJACENCY: usize     = 12;
+	pub const NUM_JOINTS: usize        = 13;
+	pub const OFS_JOINTS: usize        = 14;
+	pub const NUM_POSES: usize         = 15;
+	pub const OFS_POSES: usize         = 16;
+	pub const NUM_ANIMS: usize         = 17;
+	pub const OFS_ANIMS: usize         = 18;
+	pub const NUM_FRAMES: usize        = 19;
+	pub const NUM_FRAMECHANNELS: usize = 20;
+	pub const OFS_FRAMES: usize        = 21;
+	pub const OFS_BOUNDS: usize        = 22;
+	pub const NUM_COMMENT: usize       = 23;
+	pub const OFS_COMMENT: usize       = 24;
+	pub const NUM_EXTENSIONS: usize    = 25;
+	pub const OFS_EXTENSIONS: usize    = 26;
 }
 
-pub fn parse_iqm (input: &[u8]) -> IResult<&[u8], Iqm> {
+#[derive (Debug)]
+pub struct IqmMesh {
+	name: u32,
+	material: u32,
+	first_vertex: u32,
+	num_vertexes: u32,
+	first_triangle: u32,
+	num_triangles: u32,
+}
+
+#[derive (Debug)]
+pub struct IqmHeader {
+	fields: [u32; 27],
+}
+
+#[derive (Debug)]
+pub struct IqmModel {
+	header: IqmHeader,
+	text: Vec <u8>,
+	meshes: Vec <IqmMesh>,
+}
+
+impl IqmHeader {
+	pub fn from_slice (input: &[u8]) -> IResult <&[u8], IqmHeader> {
 		let (input, _) = tag (b"INTERQUAKEMODEL\0")(input)?;
 		let (input, version) = le_u32 (input)?;
 		
 		// I only know how to parse version 2
 		assert_eq! (version, 2);
 		
-	let (input, filesize) = le_u32 (input)?;
-	let (input, flags) = le_u32 (input)?;
+		let mut input = input;
+		let mut fields = [0; 27];
+		fields [0] = version;
 		
-	Ok ((input, Iqm {
-		version,
-		filesize,
-		flags,
+		for index in 1..fields.len () {
+			let (i, h) = le_u32 (input)?;
+			input = i;
+			fields [usize::from (index)] = h;
+		}
+		
+		Ok ((input, IqmHeader {
+			fields,
 		}))
 	}
+}
+
+impl IqmMesh {
+	pub fn from_slice (input: &[u8]) -> IResult <&[u8], IqmMesh> {
+		let mut result = IqmMesh {
+			name: 0,
+			material: 0,
+			first_vertex: 0,
+			num_vertexes: 0,
+			first_triangle: 0,
+			num_triangles: 0,
+		};
+		
+		let mut input = input;
+		for field in [
+			&mut result.name,
+			&mut result.material,
+			&mut result.first_vertex,
+			&mut result.num_vertexes,
+			&mut result.first_triangle,
+			&mut result.num_triangles,
+		].iter_mut () {
+			let (i, f) = le_u32 (input)?;
+			input = i;
+			**field = f;
+		}
+		
+		Ok ((input, result))
+	}
+}
+
+impl IqmModel {
+	pub fn from_slice (input: &[u8]) -> IqmModel {
+		let header = IqmHeader::from_slice (input).unwrap ().1;
+		
+		let text = {
+			let offset: usize = header.fields [iqm_consts::OFS_TEXT].try_into ().unwrap ();
+			let num: usize = header.fields [iqm_consts::NUM_TEXT].try_into ().unwrap ();
+			Vec::from (&input [offset..offset + num])
+		};
+		
+		let meshes = {
+			let mut meshes = vec! [];
+			let mesh_size = 6 * 4;
+			let meshes_offset: usize = header.fields [iqm_consts::OFS_MESHES].try_into ().unwrap ();
+			
+			for i in 0..header.fields [iqm_consts::NUM_MESHES] {
+				let i: usize = i.try_into ().unwrap ();
+				
+				let offset = meshes_offset + i * mesh_size;
+				let mesh_slice = &input [offset..offset + mesh_size];
+				
+				meshes.push (IqmMesh::from_slice (mesh_slice).unwrap ().1);
+			}
+			meshes
+		};
+		
+		IqmModel {
+			header,
+			text,
+			meshes,
+		}
+	}
+}
 
 pub fn load_small_file <P> (name: P) -> Vec <u8>
 where P: AsRef <Path> 
@@ -364,9 +480,19 @@ mod tests {
 	#[test]
 	pub fn iqm () {
 		let data = load_small_file ("pumpking.iqm");
-		let model = parse_iqm (&data [..]).unwrap ().1;
 		
-		assert_eq! (model.filesize, 90368);
-		assert_eq! (model.flags, 0);
+		{
+			let model = IqmHeader::from_slice (&data [..]).unwrap ().1;
+			
+			assert_eq! (model.fields [1], 90368);
+			assert_eq! (model.fields [2], 0);
+			assert_eq! (model.fields [iqm_consts::VERSION], 2);
+		}
+		
+		{
+			let model = IqmModel::from_slice (&data [..]);
+			
+			println! ("{:?}", model.meshes);
+		}
 	}
 }