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gpu: separate the construction and placing of material quads

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We're about to cache the transformed materials. It's easier to do when
quads can be constructed before determining their atlas position.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-03-08 20:10:11 +01:00
parent 57750fc8a0
commit 1b142c07e0
1 changed files with 23 additions and 26 deletions
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gpu/compute.go
+23 -26
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@@ -507,9 +507,9 @@ func pow2Ceil(v int) int {
return 1 << exp
}
// addMaterialQuad appends a render of an image to materials and returns the pixel offset
// that maps the material texture to the correct position in the rendered image.
func (g *compute) addMaterialQuad(M f32.Affine2D, img imageOpData) (image.Point, error) {
// materialQuad constructs a quad that represents the transformed image. It returns the quad
// and its bounds.
func (g *compute) materialQuad(M f32.Affine2D, img imageOpData) ([4]materialVertex, image.Rectangle) {
imgSize := layout.FPt(img.src.Bounds().Size())
sx, hx, ox, hy, sy, oy := M.Elems()
transOff := f32.Pt(ox, oy)
@@ -534,21 +534,6 @@ func (g *compute) addMaterialQuad(M f32.Affine2D, img imageOpData) (image.Point,
}
bounds := boundRectF(boundsf)
size := bounds.Size()
// A material is clipped to avoid drawing outside its bounds inside the atlas. However,
// imprecision in the clipping may cause a single pixel overflow. Be safe.
size = size.Add(image.Pt(1, 1))
place, fits := g.materials.packer.tryAdd(size)
if !fits {
return image.Point{}, errors.New("compute: no space left in image atlas")
}
// Position quad to match place.
offset := place.Pos.Sub(bounds.Min)
offsetf := layout.FPt(offset)
q0 = q0.Add(offsetf)
q1 = q1.Add(offsetf)
q2 = q2.Add(offsetf)
q3 = q3.Add(offsetf)
uvPos, ok := g.images.positions[img.handle]
if !ok {
panic("compute: internal error: image not placed")
@@ -565,9 +550,7 @@ func (g *compute) addMaterialQuad(M f32.Affine2D, img imageOpData) (image.Point,
{posX: q2.X, posY: q2.Y, u: uvBounds.Max.X, v: uvBounds.Max.Y},
{posX: q3.X, posY: q3.Y, u: uvBounds.Max.X, v: uvBounds.Min.Y},
}
// Draw quad as two triangles.
g.materials.quads = append(g.materials.quads, quad[0], quad[1], quad[3], quad[3], quad[1], quad[2])
return offset, nil
return quad, bounds
}
func max(p1, p2 f32.Point) f32.Point {
@@ -603,12 +586,26 @@ func (g *compute) encodeOps(trans f32.Affine2D, viewport image.Point, ops []imag
switch m.material {
case materialTexture:
t := trans.Mul(m.trans)
off, err := g.addMaterialQuad(t, m.data)
if err != nil {
return err
}
quad, bounds := g.materialQuad(t, m.data)
g.enc.fillImage(0, off)
// A material is clipped to avoid drawing outside its bounds inside the atlas. However,
// imprecision in the clipping may cause a single pixel overflow. Be safe.
size := bounds.Size().Add(image.Pt(1, 1))
place, fits := g.materials.packer.tryAdd(size)
if !fits {
return errors.New("compute: no space left in image atlas")
}
// Position quad to match place.
offset := place.Pos.Sub(bounds.Min)
offsetf := layout.FPt(offset)
for i := range quad {
quad[i].posX += offsetf.X
quad[i].posY += offsetf.Y
}
// Draw quad as two triangles.
g.materials.quads = append(g.materials.quads, quad[0], quad[1], quad[3], quad[3], quad[1], quad[2])
g.enc.fillImage(0, offset)
case materialColor:
g.enc.fill(f32color.NRGBAToRGBA(op.material.color.SRGB()))
case materialLinearGradient: