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FUN GAME SAVE FILE FORMAT VERSION 0.3
- little endian
- 32-bit IEEE-754 floats
- UTF-8 strings which are *not* null terminated
- units are metric and 1 unit is 1 meter
- quaternions are xyzw and need normalization
- pids start at 1 and are monotonic, 0 is reserved for null parent
VERSION CHANGES
0.3:
Added root_body to identify which body drives the entity pose.
Stored after body_cnt; adds 4 bytes per physics component.
Zero-based body index. Empty rigs store 0.
0.2:
Replaced axis_a/axis_b with frame_rot_a/frame_rot_b.
Joint records increased from 85 to 93 bytes.
CHUNK LABELS
- ENVR
- ENTT
- TRFM
- MODL
- MTEX
- MUVS
- MSHD
- PHYS
DATA RECORDS
- environment record
- entity record
- transform component record
- model component record
- texture override record
- texcoord override record
- shader override record
- physics component record
- physics body record
- physics shape record
- box
- sphere
- cylinder
- capsule
- convex hull
- static trimesh
- physics joint record
FILE HEADER
char[4] magic "FGSF"
u16 major
u16 minor
CHUNK
char[4] label
u32 size
u8[size] data
ENVR
f32 day_start
f32 day_len
ENTT
u64 next_pid
u32 entity_cnt
repeat entity_cnt:
u64 pid
u32 name_len
char[name_len] name
TRFM
u32 transform_cnt
repeat transform_cnt:
u64 pid
u64 parent_pid
f32[3] pos
f32[4] rot
f32[3] scale
MODL
u32 model_cnt
repeat model_cnt:
u64 entity_pid
u32 key_len
char[key_len] key
bool(u8) draw
MTEX
u32 texture_override_cnt
repeat texture_override_cnt:
u64 entity_pid
u32 material_idx
u32 key_len
char[key_len] texture_key
MUVS
u32 material_uv_cnt
repeat material_uv_cnt:
u64 entity_pid
u32 material_idx
f32[2] uv_scale
f32[2] uv_offset
MSHD
u32 shader_override_cnt
repeat shader_override_cnt:
u64 entity_pid
u32 material_idx
u32 key_len
char[key_len] shader_key
PHYS
u32 physics_cnt
repeat physics_cnt:
u64 pid
u32 body_cnt
u32 root_body
body[body_cnt]
u32 joint_cnt
joint[joint_cnt]
PHYSICS BODY
f32[3] pos
f32[4] rot
f32 linear_damping
f32 angular_damping
f32 gravity_scale
u8 physics_mode
bool(u8) enable_sleep
u32 shape_cnt
shape[shape_cnt]
PHYSICS SHAPE
u8 tag
f32[3] pos
f32[4] rot
f32 density
f32 friction
f32 restitution
u32 category_bits
u32 mask_bits
switch tag:
BOX
f32[3] sz
SPHERE
f32 radius
CYLINDER or CAPSULE
f32 height
f32 radius
CONVEX HULL
u32 points_cnt
f32[points_cnt][3] points
TRIMESH
u32 point_cnt
u32 index_cnt
f32[point_cnt][3] points
u32[index_cnt] indices
PHYSICS JOINT
u8 tag
u32 body_a
u32 body_b
u32 flags
f32[3] anchor_a
f32[3] anchor_b
f32[4] axis_a
f32[4] axis_b
f32 lower
f32 upper
f32 spring_hz
f32 spring_damping
f32 motor_speed
f32 motor_force
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