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go-opengl-pixel
mirror of https://github.com/faiface/pixel.git
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don't call Len() when it can't change 

updateData()'s loops checking gt.Len() turns out to have been costing
significant computation, not least because each call then in turn
called gt.vs.Stride().
This commit is contained in:
Seebs 2017-06-09 19:19:32 -05:00
parent 31fc049ab7
commit 9a6e6066bd
1 changed files with 16 additions and 15 deletions
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31
pixelgl/gltriangles.go
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@ -101,16 +101,17 @@ func (gt *GLTriangles) updateData(t pixel.Triangles) {
}
// TrianglesData short path
stride := gt.vs.Stride()
length := gt.Len()
if t, ok := t.(*pixel.TrianglesData); ok {
for i := 0; i < gt.Len(); i++ {
for i := 0; i < length; i++ {
var (
px, py = (*t)[i].Position.XY()
col = (*t)[i].Color
tx, ty = (*t)[i].Picture.XY()
in = (*t)[i].Intensity
)
s := gt.vs.Stride()
d := gt.data[i*s : i*s+9]
d := gt.data[i*stride : i*stride+9]
d[0] = float32(px)
d[1] = float32(py)
d[2] = float32(col.R)
@ -125,27 +126,27 @@ func (gt *GLTriangles) updateData(t pixel.Triangles) {
}
if t, ok := t.(pixel.TrianglesPosition); ok {
for i := 0; i < gt.Len(); i++ {
for i := 0; i < length; i++ {
px, py := t.Position(i).XY()
gt.data[i*gt.vs.Stride()+0] = float32(px)
gt.data[i*gt.vs.Stride()+1] = float32(py)
gt.data[i*stride+0] = float32(px)
gt.data[i*stride+1] = float32(py)
}
}
if t, ok := t.(pixel.TrianglesColor); ok {
for i := 0; i < gt.Len(); i++ {
for i := 0; i < length; i++ {
col := t.Color(i)
gt.data[i*gt.vs.Stride()+2] = float32(col.R)
gt.data[i*gt.vs.Stride()+3] = float32(col.G)
gt.data[i*gt.vs.Stride()+4] = float32(col.B)
gt.data[i*gt.vs.Stride()+5] = float32(col.A)
gt.data[i*stride+2] = float32(col.R)
gt.data[i*stride+3] = float32(col.G)
gt.data[i*stride+4] = float32(col.B)
gt.data[i*stride+5] = float32(col.A)
}
}
if t, ok := t.(pixel.TrianglesPicture); ok {
for i := 0; i < gt.Len(); i++ {
for i := 0; i < length; i++ {
pic, intensity := t.Picture(i)
gt.data[i*gt.vs.Stride()+6] = float32(pic.X)
gt.data[i*gt.vs.Stride()+7] = float32(pic.Y)
gt.data[i*gt.vs.Stride()+8] = float32(intensity)
gt.data[i*stride+6] = float32(pic.X)
gt.data[i*stride+7] = float32(pic.Y)
gt.data[i*stride+8] = float32(intensity)
}
}
}