forked from g3n/engine
/
common.go
442 lines (385 loc) · 10.1 KB
/
common.go
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// Copyright 2016 The G3N Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package collada
import (
"bytes"
"encoding/xml"
"fmt"
"io"
"strconv"
"strings"
)
//
// Source
//
type Source struct {
Id string // Source id
Name string // Source name
ArrayElement interface{} // Array element (FloatArray|others)
TechniqueCommon struct {
Accessor Accessor
}
}
// Dump prints out information about the Source
func (s *Source) Dump(out io.Writer, indent int) {
fmt.Fprintf(out, "%sSource id:%s name:%s\n", sIndent(indent), s.Id, s.Name)
ind := indent + step
switch at := s.ArrayElement.(type) {
case *FloatArray:
at.Dump(out, ind)
case *NameArray:
at.Dump(out, ind)
}
fmt.Fprintf(out, "%sTechniqueCommon\n", sIndent(ind))
s.TechniqueCommon.Accessor.Dump(out, ind+3)
}
//
// NameArray
//
type NameArray struct {
Id string
Name string
Count int
Data []string
}
// Dump prints out information about the NameArray
func (na *NameArray) Dump(out io.Writer, indent int) {
fmt.Fprintf(out, "%sNameArray id:%s count:%d\n", sIndent(indent), na.Id, na.Count)
ind := indent + step
fmt.Fprintf(out, "%sData(%d):%s\n", sIndent(ind), len(na.Data), na.Data)
}
//
// FloatArray
//
type FloatArray struct {
Id string
Count int
Data []float32
}
// Dump prints out information about the FloatArray
func (fa *FloatArray) Dump(out io.Writer, indent int) {
fmt.Fprintf(out, "%sFloatArray id:%s count:%d\n", sIndent(indent), fa.Id, fa.Count)
ind := indent + step
fmt.Fprintf(out, "%sData(%d):%s\n", sIndent(ind), len(fa.Data), f32sToString(fa.Data, 20))
}
//
// Accessor
//
type Accessor struct {
Source string
Count int
Stride int
Params []Param
}
// Dump prints out information about the Accessor
func (ac *Accessor) Dump(out io.Writer, indent int) {
fmt.Fprintf(out, "%sAccessor source:%s count:%d stride:%d\n",
sIndent(indent), ac.Source, ac.Count, ac.Stride)
ind := indent + step
for _, p := range ac.Params {
p.Dump(out, ind)
}
}
//
// Param for <bind_material> and <accessor>
//
type Param struct {
Name string
Type string
}
// Dump prints out information about the Param
func (p *Param) Dump(out io.Writer, indent int) {
fmt.Fprintf(out, "%sParam name:%s type:%s\n", sIndent(indent), p.Name, p.Type)
}
// decSource decodes the source from the specified mesh
func (d *Decoder) decSource(start xml.StartElement) (*Source, error) {
// Create source and adds it to the mesh
source := new(Source)
source.Id = findAttrib(start, "id").Value
source.Name = findAttrib(start, "name").Value
// Decodes source children
for {
// Get next child
child, data, err := d.decNextChild(start)
if err != nil || child.Name.Local == "" {
return source, err
}
if child.Name.Local == "float_array" {
err = d.decFloatArray(child, data, source)
if err != nil {
return nil, err
}
continue
}
if child.Name.Local == "Name_array" {
err = d.decNameArray(child, data, source)
if err != nil {
return nil, err
}
continue
}
// Decodes technique_common which should contain an Acessor
if child.Name.Local == "technique_common" {
err = d.decSourceTechniqueCommon(child, source)
if err != nil {
return nil, err
}
continue
}
}
}
// decSource decodes the float array from the specified source
func (d *Decoder) decFloatArray(start xml.StartElement, data []byte, source *Source) error {
// Create float array and associates it to the parent source
farray := &FloatArray{}
farray.Id = findAttrib(start, "id").Value
farray.Count, _ = strconv.Atoi(findAttrib(start, "count").Value)
source.ArrayElement = farray
// Allocates memory for array
farray.Data = make([]float32, farray.Count, farray.Count)
// Reads the numbers from the data
err := decFloat32Sequence(data, farray.Data)
if err != nil {
return err
}
return nil
}
func (d *Decoder) decNameArray(start xml.StartElement, data []byte, source *Source) error {
narray := new(NameArray)
narray.Id = findAttrib(start, "id").Value
narray.Count, _ = strconv.Atoi(findAttrib(start, "count").Value)
source.ArrayElement = narray
// Allocates memory for array
narray.Data = make([]string, narray.Count, narray.Count)
// Reads the strings from the data
err := decStringSequence(data, narray.Data)
if err != nil {
return err
}
return nil
}
func (d *Decoder) decSourceTechniqueCommon(start xml.StartElement, source *Source) error {
// Decodes source technique common children
for {
// Get next child
child, _, err := d.decNextChild(start)
if err != nil || child.Name.Local == "" {
return err
}
//log.Debug("decSourceTechniqueCommon(%s): %s", start.Name.Local, child.Name.Local)
if child.Name.Local == "accessor" {
err = d.decAcessor(child, source)
if err != nil {
return err
}
continue
}
}
}
// decAcessore decodes the acessor from the specified source
func (d *Decoder) decAcessor(start xml.StartElement, source *Source) error {
// Sets accessor fields
source.TechniqueCommon.Accessor.Source = findAttrib(start, "source").Value
source.TechniqueCommon.Accessor.Count, _ = strconv.Atoi(findAttrib(start, "count").Value)
source.TechniqueCommon.Accessor.Stride, _ = strconv.Atoi(findAttrib(start, "stride").Value)
// Decodes accessor children
for {
// Get next child
child, _, err := d.decNextChild(start)
if err != nil || child.Name.Local == "" {
return err
}
// param
if child.Name.Local == "param" {
err = d.decParam(child, &source.TechniqueCommon.Accessor)
if err != nil {
return err
}
}
}
}
func (d *Decoder) decParam(start xml.StartElement, accessor *Accessor) error {
p := Param{}
p.Name = findAttrib(start, "name").Value
p.Type = findAttrib(start, "type").Value
accessor.Params = append(accessor.Params, p)
return nil
}
func (d *Decoder) decNextChild(parent xml.StartElement) (xml.StartElement, []byte, error) {
for {
var tok interface{}
var err error
// Reads next token
if d.lastToken == nil {
tok, err = d.xmldec.Token()
if err != nil {
return xml.StartElement{}, nil, err
}
} else {
tok = d.lastToken
d.lastToken = nil
}
// Checks if it is the end element of this parent
el, ok := tok.(xml.EndElement)
if ok {
if el.Name.Local == parent.Name.Local {
return xml.StartElement{}, nil, nil
}
continue
}
// Checks if it is a start element
start, ok := tok.(xml.StartElement)
if !ok {
continue
}
// Get this start element optional char data (should be next token)
tok, err = d.xmldec.Token()
if err != nil {
return xml.StartElement{}, nil, err
}
// If token read is CharData, return the start element and its CharData
cdata, ok := tok.(xml.CharData)
if ok {
return start, cdata, nil
}
// Token read was not CharData and was not processed
// Save it into "lastToken" to be processed at the next call
d.lastToken = tok
return start, nil, nil
}
}
func findAttrib(s xml.StartElement, name string) xml.Attr {
for _, attr := range s.Attr {
if attr.Name.Local == name {
return attr
}
}
return xml.Attr{}
}
const tokenSep string = " \r\n\t"
type bytesReader struct {
pos int
source []byte
}
func (br *bytesReader) Init(source []byte) {
br.pos = 0
br.source = source
}
func (br *bytesReader) TokenNext() []byte {
// Skip leading separators
for br.pos < len(br.source) {
if bytes.IndexByte([]byte(tokenSep), br.source[br.pos]) < 0 {
break
}
br.pos++
}
if br.pos >= len(br.source) {
return nil
}
// Advance till the end of the token
start := br.pos
for br.pos < len(br.source) {
if bytes.IndexByte([]byte(tokenSep), br.source[br.pos]) >= 0 {
break
}
br.pos++
}
res := br.source[start:br.pos]
if len(res) == 0 {
return nil
}
return res
}
const step = 3
func sIndent(indent int) string {
return strings.Repeat(" ", indent)
}
// decFloat32Sequence receives a byte slice with float numbers separated
// by spaces and a preallocated destination slice.
// It reads numbers from the source byte slice, converts them to float32 and
// stores in the destination array.
func decFloat32Sequence(cdata []byte, dest []float32) error {
var br bytesReader
br.Init(cdata)
idx := 0
for {
tok := br.TokenNext()
if tok == nil {
break
}
if idx >= len(dest) {
return fmt.Errorf("To much float array data")
}
v, err := strconv.ParseFloat(string(tok), 32)
if err != nil {
return err
}
dest[idx] = float32(v)
idx++
}
if idx < len(dest)-1 {
return fmt.Errorf("Expected %d floats, got %d", len(dest), idx)
}
return nil
}
// decStringSequence receives a byte slice with strings separated
// by spaces and a preallocated destination slice.
// It reads strings from the source byte slice and
// stores in the destination array.
func decStringSequence(cdata []byte, dest []string) error {
var br bytesReader
br.Init(cdata)
idx := 0
for {
tok := br.TokenNext()
if tok == nil {
break
}
if idx >= len(dest) {
return fmt.Errorf("To many string array data")
}
dest[idx] = string(tok)
idx++
}
if idx < len(dest)-1 {
return fmt.Errorf("Expected %d strings, got %d", len(dest), idx)
}
return nil
}
func f32sToString(a []float32, max int) string {
parts := []string{"["}
if len(a) > max {
for i := 0; i < max/2; i++ {
parts = append(parts, strconv.FormatFloat(float64(a[i]), 'f', -1, 32))
}
parts = append(parts, " ... ")
for i := len(a) - max/2; i < len(a); i++ {
parts = append(parts, strconv.FormatFloat(float64(a[i]), 'f', -1, 32))
}
} else {
for i := 0; i < len(a); i++ {
parts = append(parts, strconv.FormatFloat(float64(a[i]), 'f', -1, 32))
}
}
parts = append(parts, "]")
return strings.Join(parts, " ")
}
func intsToString(a []int, max int) string {
parts := []string{"["}
if len(a) > max {
for i := 0; i < max/2; i++ {
parts = append(parts, strconv.FormatInt(int64(a[i]), 10))
}
parts = append(parts, " ... ")
for i := len(a) - max/2; i < len(a); i++ {
parts = append(parts, strconv.FormatInt(int64(a[i]), 10))
}
} else {
for i := 0; i < len(a); i++ {
parts = append(parts, strconv.FormatInt(int64(a[i]), 10))
}
}
parts = append(parts, "]")
return strings.Join(parts, " ")
}