gpu: cache quad splitting and transform

Cache also CPU operations by moving pathCache into
drawOps and use it in collectOps to avoid splitting and
transformation of quads if in cache. In order to support
this use a concrete type in opCache instead of interface.

Signed-off-by: Viktor <viktor.ogeman@gmail.com>

gpu/gpu.go

@@ -29,8 +29,7 @@ import (
 )
 
 type GPU struct {
-	pathCache *opCache
-	cache     *resourceCache
+	cache *resourceCache
 
 	defFBO                                            backend.Framebuffer
 	profile                                           string
@@ -65,6 +64,7 @@ type drawOps struct {
 	pathOps          []*pathOp
 	pathOpCache      []pathOp
 	qs               quadSplitter
+	pathCache        *opCache
 	uniqueKeyCounter int
 }
 
@@ -86,6 +86,7 @@ type pathOp struct {
 	// clip is the union of all
 	// later clip rectangles.
 	clip      image.Rectangle
+	bounds    f32.Rectangle
 	pathKey   ops.Key
 	path      bool
 	pathVerts []byte
@@ -277,10 +278,10 @@ const (
 func New(ctx backend.Device) (*GPU, error) {
 	defFBO := ctx.CurrentFramebuffer()
 	g := &GPU{
-		defFBO:    defFBO,
-		pathCache: newOpCache(),
-		cache:     newResourceCache(),
+		defFBO: defFBO,
+		cache:  newResourceCache(),
 	}
+	g.drawOps.pathCache = newOpCache()
 	if err := g.init(ctx); err != nil {
 		return nil, err
 	}
@@ -295,7 +296,7 @@ func (g *GPU) init(ctx backend.Device) error {
 
 func (g *GPU) Release() {
 	g.renderer.release()
-	g.pathCache.release()
+	g.drawOps.pathCache.release()
 	g.cache.release()
 	if g.timers != nil {
 		g.timers.release()
@@ -316,9 +317,12 @@ func (g *GPU) Collect(viewport image.Point, frameOps *op.Ops) {
 		g.cleanupTimer = g.timers.newTimer()
 	}
 	for _, p := range g.drawOps.pathOps {
-		if _, exists := g.pathCache.get(p.pathKey); !exists {
+		if _, exists := g.drawOps.pathCache.get(p.pathKey); !exists {
 			data := buildPath(g.ctx, p.pathVerts)
-			g.pathCache.put(p.pathKey, data)
+			g.drawOps.pathCache.put(p.pathKey, opCacheValue{
+				data:   data,
+				bounds: p.bounds,
+			})
 		}
 		p.pathVerts = nil
 	}
@@ -344,7 +348,7 @@ func (g *GPU) BeginFrame() {
 	g.stencilTimer.begin()
 	g.ctx.SetBlend(true)
 	g.renderer.packStencils(&g.drawOps.pathOps)
-	g.renderer.stencilClips(g.pathCache, g.drawOps.pathOps)
+	g.renderer.stencilClips(g.drawOps.pathCache, g.drawOps.pathOps)
 	g.renderer.packIntersections(g.drawOps.imageOps)
 	g.renderer.intersect(g.drawOps.imageOps)
 	g.stencilTimer.end()
@@ -361,7 +365,7 @@ func (g *GPU) BeginFrame() {
 func (g *GPU) EndFrame() {
 	g.cleanupTimer.begin()
 	g.cache.frame()
-	g.pathCache.frame()
+	g.drawOps.pathCache.frame()
 	g.cleanupTimer.end()
 	if g.drawOps.profile && g.timers.ready() {
 		zt, st, covt, cleant := g.zopsTimer.Elapsed, g.stencilTimer.Elapsed, g.coverTimer.Elapsed, g.cleanupTimer.Elapsed
@@ -505,8 +509,8 @@ func (r *renderer) stencilClips(pathCache *opCache, ops []*pathOp) {
 			r.ctx.BindFramebuffer(f.fbo)
 			r.ctx.Clear(0.0, 0.0, 0.0, 0.0)
 		}
-		data, _ := pathCache.get(p.pathKey)
-		r.pather.stencilPath(p.clip, p.place.Pos, data.(*pathData))
+		v, _ := pathCache.get(p.pathKey)
+		r.pather.stencilPath(p.clip, p.place.Pos, v.data)
 	}
 }
 
@@ -681,10 +685,11 @@ func (d *drawOps) newPathOp() *pathOp {
 	return &d.pathOpCache[len(d.pathOpCache)-1]
 }
 
-func (d *drawOps) addClipPath(state *drawState, aux []byte, auxKey ops.Key) {
+func (d *drawOps) addClipPath(state *drawState, aux []byte, auxKey ops.Key, bounds f32.Rectangle) {
 	npath := d.newPathOp()
 	*npath = pathOp{
 		parent: state.cpath,
+		bounds: bounds,
 	}
 	state.cpath = npath
 	if len(aux) > 0 {
@@ -724,9 +729,14 @@ loop:
 			if len(aux) > 0 {
 				// There is a clipping path, build the gpu data and update the
 				// cache key such that it will be equal only if the transform is the
-				// same also.
-				aux, op.bounds = d.buildVerts(aux, state.t)
+				// same also. Use cached data if we have it.
 				auxKey = auxKey.SetTransform(state.t)
+				if v, ok := d.pathCache.get(auxKey); ok {
+					// Since the GPU data exists in the cache aux will not be used.
+					op.bounds = v.bounds
+				} else {
+					aux, op.bounds = d.buildVerts(aux, state.t)
+				}
 			} else {
 				aux, op.bounds, _ = d.boundsForTransformedRect(bounds, state.t)
 				auxKey = d.noCacheKey()
@@ -736,7 +746,7 @@ loop:
 				continue
 			}
 
-			d.addClipPath(&state, aux, auxKey)
+			d.addClipPath(&state, aux, auxKey, op.bounds)
 			aux = nil
 			auxKey = ops.Key{}
 		case opconst.TypeColor:
@@ -760,7 +770,7 @@ loop:
 			if clipData != nil {
 				// The paint operation is sheared or rotated, add a clip path representing
 				// this transformed rectangle.
-				d.addClipPath(&state, clipData, d.noCacheKey())
+				d.addClipPath(&state, clipData, d.noCacheKey(), bnd)
 			}
 
 			bounds := boundRectF(clip)