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render.go
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render.go
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package engine
import (
"github.com/mumax/3/cuda"
"github.com/mumax/3/data"
"github.com/mumax/3/draw"
"image"
"image/jpeg"
"log"
"net/http"
"strings"
)
var compstr = map[string]int{"x": 2, "y": 1, "z": 0} // also swaps XYZ user space
var (
rescaleBuf *data.Slice // GPU
imgBuf *data.Slice // CPU
img = new(image.NRGBA)
renderScale = 1
renderLayer = 0
renderComp string
)
// Render image of quantity.
// Accepts url: /render/name and /render/name/component
func serveRender(w http.ResponseWriter, r *http.Request) {
url := r.URL.Path[len("/render/"):]
words := strings.Split(url, "/")
quant := words[0]
comp := renderComp
if len(words) > 1 {
comp = words[1]
}
if quant == "" {
quant = renderQ
}
q, ok := quants[quant]
if !ok {
err := "render: unknown quantity: " + url
log.Println(err)
http.Error(w, err, http.StatusNotFound)
return
} else {
render(q, comp)
jpeg.Encode(w, img, &jpeg.Options{Quality: 100})
}
}
func render(quant Slicer, comp string) {
// defer func() { // TODO: remove
// err := recover()
// if err != nil {
// log.Println("render:", err)
// }
// }()
size := quant.Mesh().Size()
// don't slice out of bounds
if renderLayer >= size[0] {
renderLayer = size[0] - 1
// TODO: update slider
}
if renderLayer < 0 {
renderLayer = 0
}
if quant.NComp() == 1 {
renderComp = ""
}
// scale the size
for i := range size {
size[i] /= renderScale
if size[i] == 0 {
size[i] = 1
}
}
size[0] = 1 // selects one layer
// make sure buffers are there
if imgBuf.Mesh().Size() != size {
mesh := data.NewMesh(size[0], size[1], size[2], 1, 1, 1)
imgBuf = data.NewSlice(3, mesh) // always 3-comp, may be re-used
}
// rescale and download
InjectAndWait(func() {
//defer func() { // TODO: remove
// err := recover()
// if err != nil {
// log.Println("render inject:", err)
// }
//}()
buf, r := quant.Slice()
if r {
defer cuda.Recycle(buf)
}
if !buf.GPUAccess() {
log.Println("no GPU access for", quant.Name)
imgBuf = Download(quant) // fallback (no zoom)
return
}
// make sure buffers are there (in CUDA context)
if rescaleBuf.Mesh().Size() != size {
mesh := data.NewMesh(size[0], size[1], size[2], 1, 1, 1)
rescaleBuf.Free()
rescaleBuf = cuda.NewSlice(1, mesh)
}
for c := 0; c < quant.NComp(); c++ {
cuda.Resize(rescaleBuf, buf.Comp(c), renderLayer)
data.Copy(imgBuf.Comp(c), rescaleBuf)
}
})
d := imgBuf
if comp != "" && d.NComp() > 1 {
c := compstr[comp]
d = d.Comp(c)
}
draw.On(img, d, "auto", "auto")
}