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op/paint: add opacity operation

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The new paint.PushOpacity allows for adjusting the opacity of a group
of drawing operations.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2023-09-07 14:44:56 -05:00
parent ae43d18ced
commit ae3bd2a1e1
8 changed files with 270 additions and 53 deletions
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gpu/gpu.go
+188 -42
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@@ -68,22 +68,40 @@ type renderer struct {
pather *pather
packer packer
intersections packer
layers packer
layerFBOs fboSet
}
type drawOps struct {
profile bool
reader ops.Reader
states []f32.Affine2D
transStack []f32.Affine2D
vertCache []byte
viewport image.Point
clear bool
clearColor f32color.RGBA
imageOps []imageOp
pathOps []*pathOp
pathOpCache []pathOp
qs quadSplitter
pathCache *opCache
profile bool
reader ops.Reader
states []f32.Affine2D
transStack []f32.Affine2D
layers []opacityLayer
opacityStack []int
vertCache []byte
viewport image.Point
clear bool
clearColor f32color.RGBA
imageOps []imageOp
pathOps []*pathOp
pathOpCache []pathOp
qs quadSplitter
pathCache *opCache
}
type opacityLayer struct {
opacity float32
parent int
// depth of the opacity stack. Layers of equal depth are
// independent and may be packed into one atlas.
depth int
// opStart and opEnd denote the range of drawOps.imageOps
// that belong to the layer.
opStart, opEnd int
// clip of the layer operations.
clip image.Rectangle
place placement
}
type drawState struct {
@@ -127,7 +145,12 @@ type imageOp struct {
clip image.Rectangle
material material
clipType clipType
place placement
// place is either a placement in the path fbos or intersection fbos,
// depending on clipType.
place placement
// layerOps is the number of operations this
// operation replaces.
layerOps int
}
func decodeStrokeOp(data []byte) float32 {
@@ -154,10 +177,12 @@ type material struct {
// For materialTypeColor.
color f32color.RGBA
// For materialTypeLinearGradient.
color1 f32color.RGBA
color2 f32color.RGBA
color1 f32color.RGBA
color2 f32color.RGBA
opacity float32
// For materialTypeTexture.
data imageOpData
tex driver.Texture
uvTrans f32.Affine2D
}
@@ -222,8 +247,6 @@ func decodeLinearGradientOp(data []byte) linearGradientOpData {
}
}
type clipType uint8
type resource interface {
release()
}
@@ -273,6 +296,8 @@ type blitUniforms struct {
transform [4]float32
uvTransformR1 [4]float32
uvTransformR2 [4]float32
opacity float32
_ [3]float32
}
type colorUniforms struct {
@@ -284,7 +309,7 @@ type gradientUniforms struct {
color2 f32color.RGBA
}
type materialType uint8
type clipType uint8
const (
clipTypeNone clipType = iota
@@ -292,6 +317,8 @@ const (
clipTypeIntersection
)
type materialType uint8
const (
materialColor materialType = iota
materialLinearGradient
@@ -391,6 +418,8 @@ func (g *gpu) frame(target RenderTarget) error {
g.coverTimer.begin()
g.renderer.uploadImages(g.cache, g.drawOps.imageOps)
g.renderer.prepareDrawOps(g.cache, g.drawOps.imageOps)
g.drawOps.layers = g.renderer.packLayers(g.drawOps.layers)
g.renderer.drawLayers(g.cache, g.drawOps.layers, g.drawOps.imageOps)
d := driver.LoadDesc{
ClearColor: g.drawOps.clearColor,
}
@@ -400,7 +429,7 @@ func (g *gpu) frame(target RenderTarget) error {
}
g.ctx.BeginRenderPass(defFBO, d)
g.ctx.Viewport(0, 0, viewport.X, viewport.Y)
g.renderer.drawOps(g.cache, g.drawOps.imageOps)
g.renderer.drawOps(g.cache, image.Point{}, g.renderer.blitter.viewport, g.drawOps.imageOps)
g.coverTimer.end()
g.ctx.EndRenderPass()
g.cleanupTimer.begin()
@@ -464,15 +493,18 @@ func newRenderer(ctx driver.Device) *renderer {
if cap := 8192; maxDim > cap {
maxDim = cap
}
d := image.Pt(maxDim, maxDim)
r.packer.maxDims = image.Pt(maxDim, maxDim)
r.intersections.maxDims = image.Pt(maxDim, maxDim)
r.packer.maxDims = d
r.intersections.maxDims = d
r.layers.maxDims = d
return r
}
func (r *renderer) release() {
r.pather.release()
r.blitter.release()
r.layerFBOs.delete(r.ctx, 0)
}
func newBlitter(ctx driver.Device) *blitter {
@@ -747,8 +779,7 @@ func (r *renderer) packStencils(pops *[]*pathOp) {
ops = ops[:len(ops)-1]
continue
}
sz := image.Point{X: p.clip.Dx(), Y: p.clip.Dy()}
place, ok := r.packer.add(sz)
place, ok := r.packer.add(p.clip.Size())
if !ok {
// The clip area is at most the entire screen. Hopefully no
// screen is larger than GL_MAX_TEXTURE_SIZE.
@@ -760,6 +791,83 @@ func (r *renderer) packStencils(pops *[]*pathOp) {
*pops = ops
}
func (r *renderer) packLayers(layers []opacityLayer) []opacityLayer {
// Make every layer bounds contain nested layers; cull empty layers.
for i := len(layers) - 1; i >= 0; i-- {
l := layers[i]
if l.parent != -1 {
b := layers[l.parent].clip
layers[l.parent].clip = b.Union(l.clip)
}
if l.clip.Empty() {
layers = append(layers[:i], layers[i+1:]...)
}
}
// Pack layers.
r.layers.clear()
depth := 0
for i := range layers {
l := &layers[i]
// Only layers of the same depth may be packed together.
if l.depth != depth {
r.layers.newPage()
}
place, ok := r.layers.add(l.clip.Size())
if !ok {
// The layer area is at most the entire screen. Hopefully no
// screen is larger than GL_MAX_TEXTURE_SIZE.
panic(fmt.Errorf("layer size %v is larger than maximum texture size %v", l.clip.Size(), r.layers.maxDims))
}
l.place = place
}
return layers
}
func (r *renderer) drawLayers(cache *resourceCache, layers []opacityLayer, ops []imageOp) {
if len(r.layers.sizes) == 0 {
return
}
fbo := -1
r.layerFBOs.resize(r.ctx, driver.TextureFormatSRGBA, r.layers.sizes)
for i := len(layers) - 1; i >= 0; i-- {
l := layers[i]
if fbo != l.place.Idx {
if fbo != -1 {
r.ctx.EndRenderPass()
r.ctx.PrepareTexture(r.layerFBOs.fbos[fbo].tex)
}
fbo = l.place.Idx
f := r.layerFBOs.fbos[fbo]
r.ctx.BeginRenderPass(f.tex, driver.LoadDesc{Action: driver.LoadActionClear})
}
v := image.Rectangle{
Min: l.place.Pos,
Max: l.place.Pos.Add(l.clip.Size()),
}
r.ctx.Viewport(v.Min.X, v.Min.Y, v.Max.X, v.Max.Y)
f := r.layerFBOs.fbos[fbo]
r.drawOps(cache, l.clip.Min.Mul(-1), l.clip.Size(), ops[l.opStart:l.opEnd])
sr := f32.FRect(v)
uvScale, uvOffset := texSpaceTransform(sr, f.size)
uvTrans := f32.Affine2D{}.Scale(f32.Point{}, uvScale).Offset(uvOffset)
// Replace layer ops with one textured op.
ops[l.opStart] = imageOp{
clip: l.clip,
material: material{
material: materialTexture,
tex: f.tex,
uvTrans: uvTrans,
opacity: l.opacity,
},
layerOps: l.opEnd - l.opStart - 1,
}
}
if fbo != -1 {
r.ctx.EndRenderPass()
r.ctx.PrepareTexture(r.layerFBOs.fbos[fbo].tex)
}
}
func (d *drawOps) reset(viewport image.Point) {
d.profile = false
d.viewport = viewport
@@ -768,6 +876,8 @@ func (d *drawOps) reset(viewport image.Point) {
d.pathOpCache = d.pathOpCache[:0]
d.vertCache = d.vertCache[:0]
d.transStack = d.transStack[:0]
d.layers = d.layers[:0]
d.opacityStack = d.opacityStack[:0]
}
func (d *drawOps) collect(root *op.Ops, viewport image.Point) {
@@ -866,6 +976,27 @@ loop:
state.t = d.transStack[n-1]
d.transStack = d.transStack[:n-1]
case ops.TypePushOpacity:
opacity := ops.DecodeOpacity(encOp.Data)
parent := -1
depth := len(d.opacityStack)
if depth > 0 {
parent = d.opacityStack[depth-1]
}
lidx := len(d.layers)
d.layers = append(d.layers, opacityLayer{
opacity: opacity,
parent: parent,
depth: depth,
opStart: len(d.imageOps),
})
d.opacityStack = append(d.opacityStack, lidx)
case ops.TypePopOpacity:
n := len(d.opacityStack)
idx := d.opacityStack[n-1]
d.layers[idx].opEnd = len(d.imageOps)
d.opacityStack = d.opacityStack[:n-1]
case ops.TypeStroke:
quads.key.strokeWidth = decodeStrokeOp(encOp.Data)
@@ -958,7 +1089,7 @@ loop:
mat := state.materialFor(bnd, off, partialTrans, bounds)
rect := state.cpath == nil || state.cpath.rect
if bounds.Min == (image.Point{}) && bounds.Max == d.viewport && rect && mat.opaque && (mat.material == materialColor) {
if bounds.Min == (image.Point{}) && bounds.Max == d.viewport && rect && mat.opaque && (mat.material == materialColor) && len(d.opacityStack) == 0 {
// The image is a uniform opaque color and takes up the whole screen.
// Scrap images up to and including this image and set clear color.
d.imageOps = d.imageOps[:0]
@@ -971,6 +1102,15 @@ loop:
clip: bounds,
material: mat,
}
if n := len(d.opacityStack); n > 0 {
idx := d.opacityStack[n-1]
lb := d.layers[idx].clip
if lb.Empty() {
d.layers[idx].clip = img.clip
} else {
d.layers[idx].clip = lb.Union(img.clip)
}
}
d.imageOps = append(d.imageOps, img)
if clipData != nil {
@@ -1000,7 +1140,9 @@ func expandPathOp(p *pathOp, clip image.Rectangle) {
}
func (d *drawState) materialFor(rect f32.Rectangle, off f32.Point, partTrans f32.Affine2D, clip image.Rectangle) material {
var m material
m := material{
opacity: 1.,
}
switch d.matType {
case materialColor:
m.material = materialColor
@@ -1040,10 +1182,11 @@ func (d *drawState) materialFor(rect f32.Rectangle, off f32.Point, partTrans f32
}
func (r *renderer) uploadImages(cache *resourceCache, ops []imageOp) {
for _, img := range ops {
for i := range ops {
img := &ops[i]
m := img.material
if m.material == materialTexture {
r.texHandle(cache, m.data)
img.material.tex = r.texHandle(cache, m.data)
}
}
}
@@ -1053,10 +1196,10 @@ func (r *renderer) prepareDrawOps(cache *resourceCache, ops []imageOp) {
m := img.material
switch m.material {
case materialTexture:
r.ctx.PrepareTexture(r.texHandle(cache, m.data))
r.ctx.PrepareTexture(m.tex)
}
var fbo stencilFBO
var fbo FBO
switch img.clipType {
case clipTypeNone:
continue
@@ -1069,24 +1212,26 @@ func (r *renderer) prepareDrawOps(cache *resourceCache, ops []imageOp) {
}
}
func (r *renderer) drawOps(cache *resourceCache, ops []imageOp) {
func (r *renderer) drawOps(cache *resourceCache, opOff image.Point, viewport image.Point, ops []imageOp) {
var coverTex driver.Texture
for _, img := range ops {
for i := 0; i < len(ops); i++ {
img := ops[i]
i += img.layerOps
m := img.material
switch m.material {
case materialTexture:
r.ctx.BindTexture(0, r.texHandle(cache, m.data))
r.ctx.BindTexture(0, m.tex)
}
drc := img.clip
drc := img.clip.Add(opOff)
scale, off := clipSpaceTransform(drc, r.blitter.viewport)
var fbo stencilFBO
scale, off := clipSpaceTransform(drc, viewport)
var fbo FBO
switch img.clipType {
case clipTypeNone:
p := r.blitter.pipelines[m.material]
r.ctx.BindPipeline(p.pipeline)
r.ctx.BindVertexBuffer(r.blitter.quadVerts, 0)
r.blitter.blit(m.material, m.color, m.color1, m.color2, scale, off, m.uvTrans)
r.blitter.blit(m.material, m.color, m.color1, m.color2, scale, off, m.opacity, m.uvTrans)
continue
case clipTypePath:
fbo = r.pather.stenciler.cover(img.place.Idx)
@@ -1109,7 +1254,7 @@ func (r *renderer) drawOps(cache *resourceCache, ops []imageOp) {
}
}
func (b *blitter) blit(mat materialType, col f32color.RGBA, col1, col2 f32color.RGBA, scale, off f32.Point, uvTrans f32.Affine2D) {
func (b *blitter) blit(mat materialType, col f32color.RGBA, col1, col2 f32color.RGBA, scale, off f32.Point, opacity float32, uvTrans f32.Affine2D) {
p := b.pipelines[mat]
b.ctx.BindPipeline(p.pipeline)
var uniforms *blitUniforms
@@ -1119,18 +1264,19 @@ func (b *blitter) blit(mat materialType, col f32color.RGBA, col1, col2 f32color.
uniforms = &b.colUniforms.blitUniforms
case materialTexture:
t1, t2, t3, t4, t5, t6 := uvTrans.Elems()
b.texUniforms.blitUniforms.uvTransformR1 = [4]float32{t1, t2, t3, 0}
b.texUniforms.blitUniforms.uvTransformR2 = [4]float32{t4, t5, t6, 0}
uniforms = &b.texUniforms.blitUniforms
uniforms.uvTransformR1 = [4]float32{t1, t2, t3, 0}
uniforms.uvTransformR2 = [4]float32{t4, t5, t6, 0}
case materialLinearGradient:
b.linearGradientUniforms.color1 = col1
b.linearGradientUniforms.color2 = col2
t1, t2, t3, t4, t5, t6 := uvTrans.Elems()
b.linearGradientUniforms.blitUniforms.uvTransformR1 = [4]float32{t1, t2, t3, 0}
b.linearGradientUniforms.blitUniforms.uvTransformR2 = [4]float32{t4, t5, t6, 0}
uniforms = &b.linearGradientUniforms.blitUniforms
uniforms.uvTransformR1 = [4]float32{t1, t2, t3, 0}
uniforms.uvTransformR2 = [4]float32{t4, t5, t6, 0}
}
uniforms.opacity = opacity
uniforms.transform = [4]float32{scale.X, scale.Y, off.X, off.Y}
p.UploadUniforms(b.ctx)
b.ctx.DrawArrays(0, 4)