// objTriangleLists produces a map of strings that can be used to write the
// triangle lists for all frames of an MD3's surface. Special variation on the
// forAllSurfaces function that handles base vertices (i.e., sequence is
// much more important).
func objTriangleLists(model *md3.Model) map[*md3.Surface]string {
numSurfs := model.NumSurfaces()
triStrings := make(map[*md3.Surface]string, numSurfs)
builtPairs := make(chan surfaceStringPair)
waitSignal := make(chan bool)
baseVertex := 1
for surfaceIndex := 0; surfaceIndex < numSurfs; surfaceIndex++ {
surf := model.Surface(surfaceIndex)
go surfaceTriangleList(surf, baseVertex, builtPairs)
baseVertex += surf.NumVertices()
}
go func(count int, builtPairs <-chan surfaceStringPair, waitSignal chan<- bool) {
for ; count > 0; count-- {
pair := <-builtPairs
triStrings[pair.surface] = pair.value
}
waitSignal <- true
}(numSurfs, builtPairs, waitSignal)
<-waitSignal
return triStrings
}
func performConvertModel(modelPath string, model *md3.Model, signal chan<- bool, writeQueue chan<- func()) {
waitSignal := make(chan bool)
triLists := objTriangleLists(model)
tcLists := objTexCoordLists(model)
var _ = triLists
var _ = tcLists
name := path.Base(modelPath)
name = name[:len(name)-len(path.Ext(name))]
dir := path.Clean(*outputPath)
os.MkdirAll(dir, 0755)
numFrames := model.NumFrames()
for frame := 0; frame < numFrames; frame++ {
go func(frame int) {
writeQueue <- func() {
defer func(waitSignal chan<- bool) {
go func() { waitSignal <- true }()
}(waitSignal)
var err error
var file *os.File
outName := fmt.Sprintf("%s+%d.obj", name, frame)
outPath := path.Join(dir, outName)
file, err = os.Create(outPath)
if err != nil {
log.Println("Error creating", outPath, "from", modelPath, "->", err)
return
}
defer file.Close()
_, err = fmt.Fprintf(file, "o %s\n", model.Name())
if err != nil {
log.Println("Error writing header for", outPath, "from", modelPath, "->", err)
}
numSurfaces := model.NumSurfaces()
posNorms := objPosNormLists(model, frame)
for surfIndex := 0; surfIndex < numSurfaces; surfIndex++ {
surf := model.Surface(surfIndex)
err = writeOBJSurface(file, surf, posNorms, tcLists, triLists)
if err != nil {
log.Println("Error writing surface for", outPath, "from", modelPath, "->", err)
return
}
}
}
}(frame)
}
for frame := 0; frame < numFrames; frame++ {
<-waitSignal
}
signal <- true
}
// forAllSurfaces loops over all surfaces of the given model and concurrently
// launches functions mapping the surfaces to string values. The results of the
// mapping operation are handled by a single goroutine to prevent writes from
// potentially parallel sources.
func forAllSurfaces(model *md3.Model, fn surfaceMappingFunc) map[*md3.Surface]string {
numSurfs := model.NumSurfaces()
pairs := make(map[*md3.Surface]string, numSurfs)
builtPairs := make(chan surfaceStringPair)
waitSignal := make(chan bool)
for surfaceIndex := 0; surfaceIndex < numSurfs; surfaceIndex++ {
surf := model.Surface(surfaceIndex)
go fn(surf, builtPairs)
}
go func(count int, builtPairs <-chan surfaceStringPair, waitSignal chan<- bool) {
for ; count > 0; count-- {
pair := <-builtPairs
pairs[pair.surface] = pair.value
}
waitSignal <- true
}(numSurfs, builtPairs, waitSignal)
<-waitSignal
return pairs
}