/
graph.go
80 lines (66 loc) · 1.5 KB
/
graph.go
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package drawgl
import (
"fmt"
"github.com/urandom/graph"
)
type Graph struct {
}
type Result struct {
Id graph.Id
Buffer *FloatImage
NamedBuffers map[graph.ConnectorName]*FloatImage
Meta Meta
Error error
}
type Processor interface {
Process(wd graph.WalkData, buffers map[graph.ConnectorName]Result, output chan<- Result)
}
type Meta map[string]interface{}
func (g Graph) Process(start graph.Linker) error {
walker := graph.NewWalker(start)
data := walker.Walk()
output := make(chan Result)
resultSet := make(map[graph.Id]Result)
for {
select {
case wd, open := <-data:
if open {
if p, ok := wd.Node.(Processor); ok {
pb := make(map[graph.ConnectorName]Result)
for _, p := range wd.Parents {
r := resultSet[p.Node.Id()]
if p.From != graph.OutputName {
// If the image buffer comes from a secondary output, clone it
if nb, ok := r.NamedBuffers[p.From]; ok && nb != nil {
r.Buffer = CopyImage(nb)
} else if r.Buffer != nil {
r.Buffer = CopyImage(r.Buffer)
}
}
r.Meta = copyMeta(r.Meta)
pb[p.To] = r
}
go p.Process(wd, pb, output)
} else {
wd.Close()
}
} else {
return nil
}
case r := <-output:
if r.Error != nil {
return fmt.Errorf("Error processing node %v: %v\n", r.Id, r.Error)
}
resultSet[r.Id] = r
}
}
}
func copyMeta(meta Meta) (cp Meta) {
cp = make(Meta)
if meta != nil {
for k, v := range meta {
cp[k] = v
}
}
return
}