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ebiten: add DefaultDrawFinalScreen

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Closes #3139
This commit is contained in:
Hajime Hoshi 2024-10-21 11:17:00 +09:00
parent 6452cbc895
commit 94fee8be55
1 changed files with 34 additions and 18 deletions
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52
gameforui.go
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@ -18,6 +18,7 @@ import (
"fmt"
"image"
"math"
"sync"
"sync/atomic"
"github.com/hajimehoshi/ebiten/v2/internal/atlas"
@ -32,12 +33,11 @@ func init() {
}
type gameForUI struct {
game Game
offscreen *Image
screen *Image
screenShader *Shader
imageDumper imageDumper
transparent bool
game Game
offscreen *Image
screen *Image
imageDumper imageDumper
transparent bool
}
func newGameForUI(game Game, transparent bool) *gameForUI {
@ -45,13 +45,6 @@ func newGameForUI(game Game, transparent bool) *gameForUI {
game: game,
transparent: transparent,
}
s, err := newShader(builtinshader.ScreenShaderSource, "screen")
if err != nil {
panic(fmt.Sprintf("ebiten: compiling the screen shader failed: %v", err))
}
g.screenShader = s
return g
}
@ -136,21 +129,44 @@ func (g *gameForUI) DrawFinalScreen(scale, offsetX, offsetY float64) {
return
}
DefaultDrawFinalsScreen(g.screen, g.offscreen, geoM)
}
var (
theScreenShader *Shader
theScreenShaderOnce sync.Once
)
// DefaultDrawFinalsScreen is the default implementation of [FinalScreenDrawer.DrawFinalScreen],
// used when a [Game] doesn't implement [FinalScreenDrawer].
//
// DefaultDrawFinalsScreen is used when you need the default implementation of [FinalScreenDrawer.DrawFinalScreen]
// in your implementation of [FinalScreenDrawer], for example.
func DefaultDrawFinalsScreen(screen *Image, offscreen *Image, geoM GeoM) {
theScreenShaderOnce.Do(func() {
s, err := newShader(builtinshader.ScreenShaderSource, "screen")
if err != nil {
panic(fmt.Sprintf("ebiten: compiling the screen shader failed: %v", err))
}
theScreenShader = s
})
scale := geoM.Element(0, 0)
switch {
case !screenFilterEnabled.Load(), math.Floor(scale) == scale:
op := &DrawImageOptions{}
op.GeoM = geoM
g.screen.DrawImage(g.offscreen, op)
screen.DrawImage(offscreen, op)
case scale < 1:
op := &DrawImageOptions{}
op.GeoM = geoM
op.Filter = FilterLinear
g.screen.DrawImage(g.offscreen, op)
screen.DrawImage(offscreen, op)
default:
op := &DrawRectShaderOptions{}
op.Images[0] = g.offscreen
op.Images[0] = offscreen
op.GeoM = geoM
w, h := g.offscreen.Bounds().Dx(), g.offscreen.Bounds().Dy()
g.screen.DrawRectShader(w, h, g.screenShader, op)
w, h := offscreen.Bounds().Dx(), offscreen.Bounds().Dy()
screen.DrawRectShader(w, h, theScreenShader, op)
}
}