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run.go
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run.go
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package main
import (
"image/png"
"math/rand"
"os"
"path/filepath"
)
func run(pxWide, pxHigh int, filename string, samples int, debug bool, scn scene) error {
acc := newAccumulator(pxWide, pxHigh)
rng := rand.New(rand.NewSource(0))
eng := &engine{acc, scn.cam, scn.fn, scn.sk, rng, samples, false}
eng.renderFrame()
if err := writeAccAsImage(acc, filename, false); err != nil {
return err
}
if debug {
acc := newAccumulator(pxWide, pxHigh)
rng := rand.New(rand.NewSource(0))
eng := &engine{acc, scn.cam, scn.fn, scn.sk, rng, 1, true}
eng.renderFrame()
if err := writeAccAsImage(acc, debugNormsFilename(filename), true); err != nil {
return err
}
}
return nil
}
func debugNormsFilename(filename string) string {
ext := filepath.Ext(filename)
return filename[:len(ext)-1] + "_debug_norms" + ext
}
func writeAccAsImage(acc *accumulator, filename string, raw bool) error {
img := acc.image(raw)
f, err := os.OpenFile(filename, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0644)
if err != nil {
return err
}
if err := png.Encode(f, img); err != nil {
return err
}
return f.Close()
}