147 lines
3.4 KiB
Go
147 lines
3.4 KiB
Go
package pixel
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import (
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"fmt"
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"image/color"
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"github.com/go-gl/mathgl/mgl64"
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)
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// Batch is a Target that allows for efficient drawing of many objects with the same Picture (but
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// different slices of the same Picture are allowed).
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//
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// To put an object into a Batch, just draw it onto it:
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// object.Draw(batch)
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type Batch struct {
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cont Drawer
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mat Matrix
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col NRGBA
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}
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var _ BasicTarget = (*Batch)(nil)
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// NewBatch creates an empty Batch with the specified Picture and container.
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//
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// The container is where objects get accumulated. Batch will support precisely those vertex
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// properties, that the supplied container supports.
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//
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// Note, that if the container does not support TrianglesColor, color masking will not work.
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func NewBatch(container Triangles, pic Picture) *Batch {
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return &Batch{
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cont: Drawer{Triangles: container, Picture: pic},
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mat: ZM,
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col: NRGBA{1, 1, 1, 1},
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}
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}
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// Clear removes all objects from the Batch.
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func (b *Batch) Clear() {
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b.cont.Triangles.SetLen(0)
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b.cont.Dirty()
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}
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// Draw draws all objects that are currently in the Batch onto another Target.
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func (b *Batch) Draw(t Target) {
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b.cont.Draw(t)
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}
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// SetMatrix sets a Matrix that every point will be projected by.
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func (b *Batch) SetMatrix(m Matrix) {
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b.mat = m
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}
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// SetColorMask sets a mask color used in the following draws onto the Batch.
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func (b *Batch) SetColorMask(c color.Color) {
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if c == nil {
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b.col = NRGBA{1, 1, 1, 1}
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return
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}
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b.col = NRGBAModel.Convert(c).(NRGBA)
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}
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// MakeTriangles returns a specialized copy of the provided Triangles that draws onto this Batch.
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func (b *Batch) MakeTriangles(t Triangles) TargetTriangles {
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bt := &batchTriangles{
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Triangles: t.Copy(),
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orig: MakeTrianglesData(t.Len()),
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trans: MakeTrianglesData(t.Len()),
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dst: b,
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}
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bt.orig.Update(t)
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bt.trans.Update(bt.orig)
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return bt
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}
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// MakePicture returns a specialized copy of the provided Picture that draws onto this Batch.
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func (b *Batch) MakePicture(p Picture) TargetPicture {
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if p.Original() != b.cont.Picture.Original() {
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panic(fmt.Errorf("(%T).MakePicture: Picture is not a slice of Batch's Picture", b))
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}
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bp := &batchPicture{
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Picture: p,
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dst: b,
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}
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bp.orig = bp
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return bp
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}
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type batchTriangles struct {
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Triangles
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orig, trans *TrianglesData
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dst *Batch
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}
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func (bt *batchTriangles) draw(bp *batchPicture) {
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for i := range *bt.trans {
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transPos := mgl64.Mat3(bt.dst.mat).Mul3x1(mgl64.Vec3{
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(*bt.orig)[i].Position.X(),
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(*bt.orig)[i].Position.Y(),
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1,
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})
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(*bt.trans)[i].Position = V(float64(transPos.X()), float64(transPos.Y()))
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(*bt.trans)[i].Color = (*bt.orig)[i].Color.Mul(bt.dst.col)
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(*bt.trans)[i].Picture = (*bt.orig)[i].Picture
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(*bt.trans)[i].Intensity = (*bt.orig)[i].Intensity
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}
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bt.Triangles.Update(bt.trans)
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cont := bt.dst.cont.Triangles
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cont.SetLen(cont.Len() + bt.Triangles.Len())
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cont.Slice(cont.Len()-bt.Triangles.Len(), cont.Len()).Update(bt.Triangles)
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bt.dst.cont.Dirty()
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}
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func (bt *batchTriangles) Draw() {
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bt.draw(nil)
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}
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type batchPicture struct {
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Picture
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orig *batchPicture
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dst *Batch
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}
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func (bp *batchPicture) Slice(r Rect) Picture {
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return &batchPicture{
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Picture: bp.Picture.Slice(r),
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orig: bp.orig,
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dst: bp.dst,
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}
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}
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func (bp *batchPicture) Original() Picture {
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return bp.orig
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}
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func (bp *batchPicture) Draw(t TargetTriangles) {
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bt := t.(*batchTriangles)
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if bp.dst != bt.dst {
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panic(fmt.Errorf("(%T).Draw: TargetTriangles generated by different Batch", bp))
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}
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bt.draw(bp)
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}
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