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package encoding_hxa
import "core:os"
import "core:mem"
Write_Error :: enum {
None,
Buffer_Too_Small,
Failed_File_Write,
}
write_to_file :: proc(filepath: string, file: File) -> (err: Write_Error) {
required := required_write_size(file)
buf, alloc_err := make([]byte, required)
if alloc_err == .Out_Of_Memory {
return .Failed_File_Write
}
defer delete(buf)
write_internal(&Writer{data = buf}, file)
if !os.write_entire_file(filepath, buf) {
err =.Failed_File_Write
}
return
}
write :: proc(buf: []byte, file: File) -> (n: int, err: Write_Error) {
required := required_write_size(file)
if len(buf) < required {
err = .Buffer_Too_Small
return
}
n = required
write_internal(&Writer{data = buf}, file)
return
}
required_write_size :: proc(file: File) -> (n: int) {
writer := &Writer{dummy_pass = true}
write_internal(writer, file)
n = writer.offset
return
}
@(private)
Writer :: struct {
data: []byte,
offset: int,
dummy_pass: bool,
}
@(private)
write_internal :: proc(w: ^Writer, file: File) {
write_value :: proc(w: ^Writer, value: $T) {
if !w.dummy_pass {
remaining := len(w.data) - w.offset
assert(size_of(T) <= remaining)
ptr := raw_data(w.data[w.offset:])
(^T)(ptr)^ = value
}
w.offset += size_of(T)
}
write_array :: proc(w: ^Writer, array: []$T) {
if !w.dummy_pass {
remaining := len(w.data) - w.offset
assert(size_of(T)*len(array) <= remaining)
ptr := raw_data(w.data[w.offset:])
dst := mem.slice_ptr((^T)(ptr), len(array))
copy(dst, array)
}
w.offset += size_of(T)*len(array)
}
write_string :: proc(w: ^Writer, str: string) {
if !w.dummy_pass {
remaining := len(w.data) - w.offset
assert(size_of(byte)*len(str) <= remaining)
ptr := raw_data(w.data[w.offset:])
dst := mem.slice_ptr((^byte)(ptr), len(str))
copy(dst, str)
}
w.offset += size_of(byte)*len(str)
}
write_metadata :: proc(w: ^Writer, meta_data: []Meta) {
for m in meta_data {
name_len := max(len(m.name), 255)
write_value(w, u8(name_len))
write_string(w, m.name[:name_len])
meta_data_type: Meta_Value_Type
length: u32le = 0
switch v in m.value {
case []i64le:
meta_data_type = .Int64
length = u32le(len(v))
case []f64le:
meta_data_type = .Double
length = u32le(len(v))
case []Node_Index:
meta_data_type = .Node
length = u32le(len(v))
case string:
meta_data_type = .Text
length = u32le(len(v))
case []byte:
meta_data_type = .Binary
length = u32le(len(v))
case []Meta:
meta_data_type = .Meta
length = u32le(len(v))
}
write_value(w, meta_data_type)
write_value(w, length)
switch v in m.value {
case []i64le: write_array(w, v)
case []f64le: write_array(w, v)
case []Node_Index: write_array(w, v)
case string: write_string(w, v)
case []byte: write_array(w, v)
case []Meta: write_metadata(w, v)
}
}
return
}
write_layer_stack :: proc(w: ^Writer, layers: Layer_Stack) {
write_value(w, u32(len(layers)))
for layer in layers {
name_len := max(len(layer.name), 255)
write_value(w, u8(name_len))
write_string(w, layer .name[:name_len])
write_value(w, layer.components)
layer_data_type: Layer_Data_Type
switch v in layer.data {
case []u8: layer_data_type = .Uint8
case []i32le: layer_data_type = .Int32
case []f32le: layer_data_type = .Float
case []f64le: layer_data_type = .Double
}
write_value(w, layer_data_type)
switch v in layer.data {
case []u8: write_array(w, v)
case []i32le: write_array(w, v)
case []f32le: write_array(w, v)
case []f64le: write_array(w, v)
}
}
return
}
write_value(w, &Header{
magic_number = MAGIC_NUMBER,
version = LATEST_VERSION,
internal_node_count = u32le(len(file.nodes)),
})
for node in file.nodes {
node_type: Node_Type
switch content in node.content {
case Node_Geometry: node_type = .Geometry
case Node_Image: node_type = .Image
}
write_value(w, node_type)
write_value(w, u32(len(node.meta_data)))
write_metadata(w, node.meta_data)
switch content in node.content {
case Node_Geometry:
write_value(w, content.vertex_count)
write_layer_stack(w, content.vertex_stack)
write_value(w, content.edge_corner_count)
write_layer_stack(w, content.corner_stack)
write_layer_stack(w, content.edge_stack)
write_value(w, content.face_count)
write_layer_stack(w, content.face_stack)
case Node_Image:
write_value(w, content.type)
dimensions := int(content.type)
if content.type == .Image_Cube {
dimensions = 2
}
for d in 0..<dimensions {
write_value(w, content.resolution[d])
}
write_layer_stack(w, content.image_stack)
}
}
}
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