graphicsdriver: Refactoring: ReplacePixels takes multiple arguments

This reduces the number of graphics commands, and this works more
efficiently if the driver has an efficient way.

internal/driver/graphics.go

@@ -44,7 +44,15 @@ type Image interface {
 	Pixels() ([]byte, error)
 	SetAsDestination()
 	SetAsSource()
-	ReplacePixels(pixels []byte, x, y, width, height int)
+	ReplacePixels(args []*ReplacePixelsArgs)
+}
+
+type ReplacePixelsArgs struct {
+	Pixels []byte
+	X      int
+	Y      int
+	Width  int
+	Height int
 }
 
 type VDirection int

internal/graphicscommand/command.go

@@ -434,21 +434,17 @@ func (c *drawTrianglesCommand) CanMergeWithDrawTrianglesCommand(dst, src *Image,
 
 // replacePixelsCommand represents a command to replace pixels of an image.
 type replacePixelsCommand struct {
-	dst    *Image
-	pixels []byte
-	x      int
-	y      int
-	width  int
-	height int
+	dst  *Image
+	args []*driver.ReplacePixelsArgs
 }
 
 func (c *replacePixelsCommand) String() string {
-	return fmt.Sprintf("replace-pixels: dst: %d, x: %d, y: %d, width: %d, height: %d", c.dst.id, c.x, c.y, c.width, c.height)
+	return fmt.Sprintf("replace-pixels: dst: %d, len(args): %d", c.dst.id, len(c.args))
 }
 
 // Exec executes the replacePixelsCommand.
 func (c *replacePixelsCommand) Exec(indexOffset int) error {
-	c.dst.image.ReplacePixels(c.pixels, c.x, c.y, c.width, c.height)
+	c.dst.image.ReplacePixels(c.args)
 	return nil
 }
 

internal/graphicscommand/image.go

@@ -45,6 +45,8 @@ type Image struct {
 	screen         bool
 	id             int
 
+	bufferedRP []*driver.ReplacePixelsArgs
+
 	lastCommand lastCommand
 }
 
@@ -90,6 +92,18 @@ func NewScreenFramebufferImage(width, height int) *Image {
 	return i
 }
 
+func (i *Image) resolveBufferedReplacePixels() {
+	if len(i.bufferedRP) == 0 {
+		return
+	}
+	c := &replacePixelsCommand{
+		dst:  i,
+		args: i.bufferedRP,
+	}
+	theCommandQueue.Enqueue(c)
+	i.bufferedRP = nil
+}
+
 func (i *Image) Dispose() {
 	c := &disposeCommand{
 		target: i,
@@ -134,6 +148,9 @@ func (i *Image) DrawTriangles(src *Image, vertices []float32, indices []uint16,
 		}
 	}
 
+	src.resolveBufferedReplacePixels()
+	i.resolveBufferedReplacePixels()
+
 	theCommandQueue.EnqueueDrawTrianglesCommand(i, src, vertices, indices, clr, mode, filter, address)
 
 	if i.lastCommand == lastCommandNone && !i.screen {
@@ -146,6 +163,7 @@ func (i *Image) DrawTriangles(src *Image, vertices []float32, indices []uint16,
 // Pixels returns the image's pixels.
 // Pixels might return nil when OpenGL error happens.
 func (i *Image) Pixels() []byte {
+	i.resolveBufferedReplacePixels()
 	c := &pixelsCommand{
 		result: nil,
 		img:    i,
@@ -162,15 +180,13 @@ func (i *Image) ReplacePixels(pixels []byte, x, y, width, height int) {
 			panic("graphicscommand: ReplacePixels for a part after DrawTriangles is forbidden")
 		}
 	}
-	c := &replacePixelsCommand{
-		dst:    i,
-		pixels: pixels,
-		x:      x,
-		y:      y,
-		width:  width,
-		height: height,
-	}
-	theCommandQueue.Enqueue(c)
+	i.bufferedRP = append(i.bufferedRP, &driver.ReplacePixelsArgs{
+		Pixels: pixels,
+		X:      x,
+		Y:      y,
+		Width:  width,
+		Height: height,
+	})
 	i.lastCommand = lastCommandReplacePixels
 }
 

internal/graphicsdriver/metal/driver.go

@@ -809,7 +809,7 @@ func (i *Image) SetAsSource() {
 	})
 }
 
-func (i *Image) ReplacePixels(pixels []byte, x, y, width, height int) {
+func (i *Image) ReplacePixels(args []*driver.ReplacePixelsArgs) {
 	d := i.driver
 	if d.drawCalled {
 		d.flush(true, false)
@@ -817,10 +817,12 @@ func (i *Image) ReplacePixels(pixels []byte, x, y, width, height int) {
 	}
 
 	d.t.Call(func() error {
-		i.texture.ReplaceRegion(mtl.Region{
-			Origin: mtl.Origin{X: x, Y: y, Z: 0},
-			Size:   mtl.Size{Width: width, Height: height, Depth: 1},
-		}, 0, unsafe.Pointer(&pixels[0]), 4*width)
+		for _, a := range args {
+			i.texture.ReplaceRegion(mtl.Region{
+				Origin: mtl.Origin{X: a.X, Y: a.Y, Z: 0},
+				Size:   mtl.Size{Width: a.Width, Height: a.Height, Depth: 1},
+			}, 0, unsafe.Pointer(&a.Pixels[0]), 4*a.Width)
+		}
 		return nil
 	})
 }

internal/graphicsdriver/opengl/image.go

@@ -15,17 +15,10 @@
 package opengl
 
 import (
+	"github.com/hajimehoshi/ebiten/internal/driver"
 	"github.com/hajimehoshi/ebiten/internal/graphics"
 )
 
-type bufferedRP struct {
-	pixels []byte
-	x      int
-	y      int
-	width  int
-	height int
-}
-
 type Image struct {
 	driver        *Driver
 	textureNative textureNative
@@ -34,8 +27,6 @@ type Image struct {
 	width         int
 	height        int
 	screen        bool
-
-	bufferedRPs []bufferedRP
 }
 
 func (i *Image) IsInvalidated() bool {
@@ -55,7 +46,6 @@ func (i *Image) Dispose() {
 }
 
 func (i *Image) SetAsDestination() {
-	i.resolveReplacePixels()
 	i.driver.state.destination = i
 }
 
@@ -68,7 +58,6 @@ func (i *Image) setViewport() error {
 }
 
 func (i *Image) Pixels() ([]byte, error) {
-	i.resolveReplacePixels()
 	if err := i.ensureFramebuffer(); err != nil {
 		return nil, err
 	}
@@ -101,34 +90,14 @@ func (i *Image) ensureFramebuffer() error {
 	return nil
 }
 
-func (i *Image) ReplacePixels(p []byte, x, y, width, height int) {
+func (i *Image) ReplacePixels(args []*driver.ReplacePixelsArgs) {
 	if i.screen {
 		panic("opengl: ReplacePixels cannot be called on the screen, that doesn't have a texture")
 	}
-
-	i.bufferedRPs = append(i.bufferedRPs, bufferedRP{
-		pixels: p,
-		x:      x,
-		y:      y,
-		width:  width,
-		height: height,
-	})
-}
-
-func (i *Image) SetAsSource() {
-	i.resolveReplacePixels()
-	i.driver.state.source = i
-}
-
-func (i *Image) resolveReplacePixels() {
-	if len(i.bufferedRPs) == 0 {
+	if len(args) == 0 {
 		return
 	}
 
-	defer func() {
-		i.bufferedRPs = nil
-	}()
-
 	// glFlush is necessary on Android.
 	// glTexSubImage2D didn't work without this hack at least on Nexus 5x and NuAns NEO [Reloaded] (#211).
 	if i.driver.drawCalled {
@@ -137,15 +106,19 @@ func (i *Image) resolveReplacePixels() {
 	i.driver.drawCalled = false
 
 	if !canUsePBO {
-		for _, rp := range i.bufferedRPs {
-			i.driver.context.texSubImage2D(i.textureNative, rp.pixels, rp.x, rp.y, rp.width, rp.height)
+		for _, a := range args {
+			i.driver.context.texSubImage2D(i.textureNative, a.Pixels, a.X, a.Y, a.Width, a.Height)
 		}
 		return
 	}
 
 	thePBOState.mapPBO(i)
-	for _, rp := range i.bufferedRPs {
-		thePBOState.draw(rp.pixels, rp.x, rp.y, rp.width, rp.height)
+	for _, a := range args {
+		thePBOState.draw(a.Pixels, a.X, a.Y, a.Width, a.Height)
 	}
 	thePBOState.unmapPBO()
 }
+
+func (i *Image) SetAsSource() {
+	i.driver.state.source = i
+}