interesting
/
go-opengl-pixel
mirror of https://github.com/faiface/pixel.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

update lights example code

This commit is contained in:
faiface 2017-04-15 14:09:06 +02:00
parent b51b3e8f38
commit 420e83bc61
1 changed files with 33 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
examples/lights/main.go
View File

@ -44,7 +44,7 @@ type colorlight struct {
imd *imdraw.IMDraw
}
func (cl *colorlight) apply(src, noise drawer, tmp, dst *pixelgl.Canvas) {
func (cl *colorlight) apply(src, noise drawer, dst pixel.ComposeTarget) {
// create the light arc if not created already
if cl.imd == nil {
imd := imdraw.New(nil)
@ -59,32 +59,26 @@ func (cl *colorlight) apply(src, noise drawer, tmp, dst *pixelgl.Canvas) {
}
// draw the light arc
tmp.Clear(pixel.Alpha(0))
tmp.SetMatrix(pixel.IM.Scaled(0, cl.radius).Rotated(0, cl.angle).Moved(cl.point))
tmp.SetColorMask(pixel.Alpha(1))
tmp.SetComposeMethod(pixel.ComposeCopy)
cl.imd.Draw(tmp)
dst.SetMatrix(pixel.IM.Scaled(0, cl.radius).Rotated(0, cl.angle).Moved(cl.point))
dst.SetColorMask(pixel.Alpha(1))
dst.SetComposeMethod(pixel.ComposeCopy)
cl.imd.Draw(dst)
// draw the noise inside the light
tmp.SetMatrix(pixel.IM)
tmp.SetComposeMethod(pixel.ComposeIn)
noise.Draw(tmp)
dst.SetMatrix(pixel.IM)
dst.SetComposeMethod(pixel.ComposeIn)
noise.Draw(dst)
// draw an image inside the noisy light
tmp.SetColorMask(cl.color)
tmp.SetComposeMethod(pixel.ComposeIn)
src.Draw(tmp)
dst.SetColorMask(cl.color)
dst.SetComposeMethod(pixel.ComposeIn)
src.Draw(dst)
// draw the light reflected from the dust
tmp.SetMatrix(pixel.IM.Scaled(0, cl.radius).Rotated(0, cl.angle).Moved(cl.point))
tmp.SetColorMask(cl.color.Mul(pixel.Alpha(cl.dust)))
tmp.SetComposeMethod(pixel.ComposeOver)
cl.imd.Draw(tmp)
// draw the result to the dst
dst.SetColorMask(pixel.Alpha(1))
dst.SetComposeMethod(pixel.ComposePlus)
tmp.Draw(dst)
dst.SetMatrix(pixel.IM.Scaled(0, cl.radius).Rotated(0, cl.angle).Moved(cl.point))
dst.SetColorMask(cl.color.Mul(pixel.Alpha(cl.dust)))
dst.SetComposeMethod(pixel.ComposeOver)
cl.imd.Draw(dst)
}
func run() {
@ -147,8 +141,8 @@ func run() {
speed := []float64{11.0 / 23, 13.0 / 23, 17.0 / 23, 19.0 / 23}
tmp := pixelgl.NewCanvas(win.Bounds())
dst := pixelgl.NewCanvas(win.Bounds())
oneLight := pixelgl.NewCanvas(win.Bounds())
allLight := pixelgl.NewCanvas(win.Bounds())
var (
frames = 0
@ -181,17 +175,27 @@ func run() {
}
win.Clear(pixel.RGB(0, 0, 0))
dst.Clear(pixel.Alpha(0))
dst.SetColorMask(pixel.Alpha(0.4))
dst.SetComposeMethod(pixel.ComposeOver)
panda.Draw(dst)
// draw the panda visible outside the light
win.SetColorMask(pixel.Alpha(0.4))
win.SetComposeMethod(pixel.ComposeOver)
panda.Draw(win)
allLight.Clear(pixel.Alpha(0))
allLight.SetComposeMethod(pixel.ComposePlus)
// accumulate all the lights
for i := range lights {
lights[i].apply(panda, noise, tmp, dst)
oneLight.Clear(pixel.Alpha(0))
lights[i].apply(panda, noise, oneLight)
oneLight.Draw(allLight)
}
dst.Draw(win)
// compose the final result
win.SetColorMask(pixel.Alpha(1))
win.SetComposeMethod(pixel.ComposePlus)
allLight.Draw(win)
win.Update()
<-fps30 // maintain 30 fps, because my computer couldn't handle 60 here