tweaks

src/main.rs

@@ -7,6 +7,7 @@ mod worker;
 mod zeroes;
 mod integer;
 mod physics;
+mod sniffer;
 mod graphics;
 mod settings;
 mod primitives;

src/physics.rs

@@ -18,9 +18,7 @@ pub enum PhysicsInstruction {
 	Input(PhysicsInputInstruction),
 }
 #[derive(Debug)]
-pub enum PhysicsInputInstruction {
-	ReplaceMouse(MouseState,MouseState),
-	SetNextMouse(MouseState),
+pub enum PhysicsInputInstruction{
 	SetMoveRight(bool),
 	SetMoveUp(bool),
 	SetMoveBack(bool),
@@ -29,12 +27,51 @@ pub enum PhysicsInputInstruction {
 	SetMoveForward(bool),
 	SetJump(bool),
 	SetZoom(bool),
+	ReplaceMouse(MouseState,MouseState),
+	SetNextMouse(MouseState),
 	Reset,
 	Idle,
+}
+#[derive(Debug)]
+#[repr(u32)]
+pub enum InputInstruction {
+	MoveRight(bool)=0,
+	MoveUp(bool)=1,
+	MoveBack(bool)=2,
+	MoveLeft(bool)=3,
+	MoveDown(bool)=4,
+	MoveForward(bool)=5,
+	Jump(bool)=6,
+	Zoom(bool)=7,
+	MoveMouse(glam::IVec2)=64,
+	Reset=100,
+	Idle=127,
 		//Idle: there were no input events, but the simulation is safe to advance to this timestep
 		//for interpolation / networking / playback reasons, most playback heads will always want
 		//to be 1 instruction ahead to generate the next state for interpolation.
 }
+impl InputInstruction{
+	pub fn id(&self)->u32{
+		let parity=match self{
+			crate::physics::InputInstruction::MoveRight(s)
+			|crate::physics::InputInstruction::MoveUp(s)
+			|crate::physics::InputInstruction::MoveBack(s)
+			|crate::physics::InputInstruction::MoveLeft(s)
+			|crate::physics::InputInstruction::MoveDown(s)
+			|crate::physics::InputInstruction::MoveForward(s)
+			|crate::physics::InputInstruction::Jump(s)
+			|crate::physics::InputInstruction::Zoom(s)=>(*s as u32)<<31,
+			crate::physics::InputInstruction::MoveMouse(_)
+			|crate::physics::InputInstruction::Reset
+			|crate::physics::InputInstruction::Idle=>0u32,
+		};
+		self.discriminant()|parity
+	}
+	pub fn discriminant(&self)->u32{
+		//from documentation for std::mem::discriminant(&self)
+		unsafe{*<*const _>::from(self).cast::<u32>()}
+	}
+}
 
 #[derive(Clone,Hash,Default)]
 pub struct Body{
@@ -1887,4 +1924,4 @@ fn already_inside_hit_nothing(){
 		Planar64Vec3::int(0,1,0),
 		Time::ZERO
 	),None);
-}
+}

src/sniffer.rs

@@ -0,0 +1,134 @@
+//file format "sniff"
+
+/* spec
+
+//begin global header
+
+//global metadata (32 bytes)
+b"SNFB"
+u32 format_version
+u64 priming_bytes
+	//how many bytes of the file must be read to guarantee all of the expected
+	//format-specific metadata is available to facilitate streaming the remaining contents
+	//used by the database to guarantee that it serves at least the bare minimum
+u128 resource_uuid
+	//identifies the file from anywhere for any other file
+
+//global block layout (variable size)
+u64 num_blocks
+for block_id in 0..num_blocks{
+	u64 first_byte
+}
+
+//end global header
+
+//begin blocks
+
+//each block is compressed with zstd or gz or something
+
+*/
+
+/* block types
+BLOCK_MAP_HEADER:
+DefaultStyleInfo style_info
+//bvh goes here
+u64 num_nodes
+//node 0 parent node is implied to be None
+for node_id in 1..num_nodes{
+	u64 parent_node
+}
+u64 num_spacial_blocks
+for spacial_block_id in 0..num_spacial_blocks{
+	u64 node_id
+	u64 block_id //data block
+	Aabb block_extents
+}
+//ideally spacial blocks are sorted from distance to start zone
+//texture blocks are inserted before the first spacial block they are used in
+
+BLOCK_MAP_RESOURCE:
+//an individual one of the following:
+	- model (IndexedModel)
+	- shader (compiled SPIR-V)
+	- image (JpegXL)
+	- sound (Opus)
+	- video (AV1)
+	- animation (Trey thing)
+
+BLOCK_MAP_OBJECT:
+//an individual one of the following:
+	- model instance
+	- located resource
+//for a list of resources, parse the object.
+//alternatively, BLOCK_MAP_REGION lists a group of objects to be decoded all at once
+
+BLOCK_BOT_HEADER:
+u128 map_resource_uuid //which map is this bot running
+u128 time_resource_uuid //resource database time
+//don't include style info in bot header because it's in the physics state
+//blocks are laid out in chronological order, but indices may jump around.
+u64 num_segments
+for _ in 0..num_segments{
+	i64 time //physics_state timestamp
+	u64 block_id
+}
+
+BLOCK_BOT_SEGMENT:
+//format version indicates what version of these structures to use
+PhysicsState physics_state 
+//to read, greedily decode instructions until eof
+loop{
+	//delta encode as much as possible (time,mousepos)
+	//strafe ticks are implied
+	//physics can be implied in an input-only bot file
+	TimedInstruction<PhysicsInstruction> instruction
+}
+
+BLOCK_DEMO_HEADER:
+//timeline of loading maps, player equipment, bots
+*/
+struct InputInstructionCodecState{
+	mouse_pos:glam::IVec2,
+	time:crate::integer::Time,
+}
+//8B - 12B
+impl InputInstructionCodecState{
+	pub fn encode(&mut self,ins:&crate::instruction::TimedInstruction<crate::physics::InputInstruction>)->([u8;12],usize){
+		let dt=ins.time-self.time;
+		self.time=ins.time;
+		let mut data=[0u8;12];
+		[data[0],data[1],data[2],data[3]]=(dt.nanos() as u32).to_le_bytes();//4B
+		//instruction id packed with game control parity bit.  This could be 1 byte but it ruins the alignment
+		[data[4],data[5],data[6],data[7]]=ins.instruction.id().to_le_bytes();//4B
+		match &ins.instruction{
+			&crate::physics::InputInstruction::MoveMouse(m)=>{//4B
+				let dm=m-self.mouse_pos;
+				[data[8],data[9]]=(dm.x as i16).to_le_bytes();
+				[data[10],data[11]]=(dm.y as i16).to_le_bytes();
+				self.mouse_pos=m;
+				(data,12)
+			},
+			//0B
+			crate::physics::InputInstruction::MoveRight(_)
+			|crate::physics::InputInstruction::MoveUp(_)
+			|crate::physics::InputInstruction::MoveBack(_)
+			|crate::physics::InputInstruction::MoveLeft(_)
+			|crate::physics::InputInstruction::MoveDown(_)
+			|crate::physics::InputInstruction::MoveForward(_)
+			|crate::physics::InputInstruction::Jump(_)
+			|crate::physics::InputInstruction::Zoom(_)
+			|crate::physics::InputInstruction::Reset
+			|crate::physics::InputInstruction::Idle=>(data,8),
+		}
+	}
+}
+
+//everything must be 4 byte aligned, it's all going to be compressed so don't think too had about saving less than 4 bytes
+//TODO: Omit (mouse only?) instructions that don't surround an actual physics instruction
+fn write_input_instruction<W:std::io::Write>(state:&mut InputInstructionCodecState,w:&mut W,ins:&crate::instruction::TimedInstruction<crate::physics::InputInstruction>)->Result<usize,std::io::Error>{
+	//TODO: insert idle instruction if gap is over u32 nanoseconds
+	//TODO: don't write idle instructions
+	//OR: end the data block! the full state at the start of the next block will contain an absolute timestamp
+	let (data,size)=state.encode(ins);
+	w.write(&data[0..size])//8B-12B
+}