Remove Offscreen

graphics/opengl/context.go

@@ -8,14 +8,14 @@ import "C"
 import (
 	"github.com/hajimehoshi/go-ebiten/graphics"
 	"github.com/hajimehoshi/go-ebiten/graphics/matrix"
-	"github.com/hajimehoshi/go-ebiten/graphics/opengl/offscreen"
 	"github.com/hajimehoshi/go-ebiten/graphics/opengl/rendertarget"
 )
 
 type Context struct {
 	screenId    graphics.RenderTargetId
+	mainId      graphics.RenderTargetId
+	currentId   graphics.RenderTargetId
 	ids         *ids
-	offscreen   *offscreen.Offscreen
 	screenScale int
 }
 
@@ -25,9 +25,9 @@ func newContext(ids *ids, screenWidth, screenHeight, screenScale int) *Context {
 		screenHeight*screenScale)
 	context := &Context{
 		ids:         ids,
-		offscreen:   offscreen.New(mainFramebuffer),
 		screenScale: screenScale,
 	}
+	context.mainId = context.ids.AddRenderTarget(mainFramebuffer)
 
 	var err error
 	context.screenId, err = ids.CreateRenderTarget(
@@ -56,7 +56,7 @@ func (context *Context) update(draw func(graphics.Context)) {
 	draw(context)
 
 	C.glFlush()
-	context.offscreen.SetMainFramebuffer()
+	context.SetOffscreen(context.mainId)
 	context.Clear()
 
 	scale := float64(context.screenScale)
@@ -72,36 +72,36 @@ func (context *Context) Clear() {
 }
 
 func (context *Context) Fill(r, g, b uint8) {
-	context.offscreen.Fill(r, g, b)
+	context.ids.FillRenderTarget(context.currentId, r, g, b)
 }
 
 func (context *Context) DrawTexture(
 	id graphics.TextureId, geo matrix.Geometry, color matrix.Color) {
-	context.ids.DrawTexture(id, context.offscreen, geo, color)
+	context.ids.DrawTexture(context.currentId, id, geo, color)
 }
 
 func (context *Context) DrawRenderTarget(
 	id graphics.RenderTargetId,
 	geo matrix.Geometry, color matrix.Color) {
-	context.ids.DrawRenderTarget(id, context.offscreen, geo, color)
+	context.ids.DrawRenderTarget(context.currentId, id, geo, color)
 }
 
 func (context *Context) DrawTextureParts(
 	id graphics.TextureId, parts []graphics.TexturePart,
 	geometryMatrix matrix.Geometry, colorMatrix matrix.Color) {
-	context.ids.DrawTextureParts(id, context.offscreen, parts, geometryMatrix, colorMatrix)
+	context.ids.DrawTextureParts(context.currentId, id, parts, geometryMatrix, colorMatrix)
 }
 
 func (context *Context) DrawRenderTargetParts(
 	id graphics.RenderTargetId, parts []graphics.TexturePart,
 	geometryMatrix matrix.Geometry, colorMatrix matrix.Color) {
-	context.ids.DrawRenderTargetParts(id, context.offscreen, parts, geometryMatrix, colorMatrix)
+	context.ids.DrawRenderTargetParts(context.currentId, id, parts, geometryMatrix, colorMatrix)
 }
 
 func (context *Context) ResetOffscreen() {
-	context.SetOffscreen(context.screenId)
+	context.currentId = context.screenId
 }
 
 func (context *Context) SetOffscreen(renderTargetId graphics.RenderTargetId) {
-	context.ids.SetRenderTargetAsOffscreen(renderTargetId, context.offscreen)
+	context.currentId = renderTargetId
 }

graphics/opengl/ids.go

@@ -3,7 +3,6 @@ package opengl
 import (
 	"github.com/hajimehoshi/go-ebiten/graphics"
 	"github.com/hajimehoshi/go-ebiten/graphics/matrix"
-	"github.com/hajimehoshi/go-ebiten/graphics/opengl/offscreen"
 	"github.com/hajimehoshi/go-ebiten/graphics/opengl/rendertarget"
 	"github.com/hajimehoshi/go-ebiten/graphics/opengl/texture"
 	"image"
@@ -86,6 +85,17 @@ func (i *ids) CreateRenderTarget(width, height int, filter graphics.Filter) (
 	return renderTargetId, nil
 }
 
+// NOTE: renderTarget can't be used as a texture.
+func (i *ids) AddRenderTarget(renderTarget *rendertarget.RenderTarget) graphics.RenderTargetId {
+	id := graphics.RenderTargetId(<-i.counts)
+
+	i.lock.Lock()
+	defer i.lock.Unlock()
+	i.renderTargets[id] = renderTarget
+
+	return id
+}
+
 func (i *ids) DeleteRenderTarget(id graphics.RenderTargetId) {
 	i.lock.Lock()
 	defer i.lock.Unlock()
@@ -102,28 +112,28 @@ func (i *ids) DeleteRenderTarget(id graphics.RenderTargetId) {
 	delete(i.textures, textureId)
 }
 
-func (i *ids) DrawTexture(id graphics.TextureId, offscreen *offscreen.Offscreen,
+func (i *ids) FillRenderTarget(id graphics.RenderTargetId, r, g, b uint8) {
+	i.renderTargetAt(id).Fill(r, g, b)
+}
+
+func (i *ids) DrawTexture(target graphics.RenderTargetId, id graphics.TextureId,
 	geo matrix.Geometry, color matrix.Color) {
 	texture := i.textureAt(id)
-	offscreen.DrawTexture(texture, geo, color)
+	i.renderTargetAt(target).DrawTexture(texture, geo, color)
 }
 
-func (i *ids) DrawTextureParts(id graphics.TextureId, offscreen *offscreen.Offscreen,
+func (i *ids) DrawTextureParts(target graphics.RenderTargetId, id graphics.TextureId,
 	parts []graphics.TexturePart, geo matrix.Geometry, color matrix.Color) {
 	texture := i.textureAt(id)
-	offscreen.DrawTextureParts(texture, parts, geo, color)
+	i.renderTargetAt(target).DrawTextureParts(texture, parts, geo, color)
 }
 
-func (i *ids) DrawRenderTarget(id graphics.RenderTargetId, offscreen *offscreen.Offscreen,
+func (i *ids) DrawRenderTarget(target graphics.RenderTargetId, id graphics.RenderTargetId,
 	geo matrix.Geometry, color matrix.Color) {
-	i.DrawTexture(i.toTexture(id), offscreen, geo, color)
+	i.DrawTexture(target, i.toTexture(id), geo, color)
 }
 
-func (i *ids) DrawRenderTargetParts(id graphics.RenderTargetId, offscreen *offscreen.Offscreen,
+func (i *ids) DrawRenderTargetParts(target graphics.RenderTargetId, id graphics.RenderTargetId,
 	parts []graphics.TexturePart, geo matrix.Geometry, color matrix.Color) {
-	i.DrawTextureParts(i.toTexture(id), offscreen, parts, geo, color)
+	i.DrawTextureParts(target, i.toTexture(id), parts, geo, color)
-}
-
-func (i *ids) SetRenderTargetAsOffscreen(id graphics.RenderTargetId, offscreen *offscreen.Offscreen) {
-	offscreen.Set(i.renderTargetAt(id))
 }

graphics/opengl/offscreen/offscreen.go

@@ -1,62 +0,0 @@
-package offscreen
-
-import (
-	"github.com/hajimehoshi/go-ebiten/graphics"
-	"github.com/hajimehoshi/go-ebiten/graphics/matrix"
-)
-
-type Texture interface {
-	Draw(projectionMatrix [4][4]float64,
-		geometryMatrix matrix.Geometry, colorMatrix matrix.Color)
-	DrawParts(parts []graphics.TexturePart, projectionMatrix [4][4]float64,
-		geometryMatrix matrix.Geometry, colorMatrix matrix.Color)
-}
-
-type RenderTarget interface {
-	SetAsViewport()
-	ProjectionMatrix() [4][4]float64
-	Clear()
-	Fill(r, g, b uint8)
-}
-
-type Offscreen struct {
-	currentRenderTarget RenderTarget
-	mainFramebuffer     RenderTarget
-}
-
-func New(mainFramebuffer RenderTarget) *Offscreen {
-	return &Offscreen{
-		mainFramebuffer: mainFramebuffer,
-	}
-}
-
-func (o *Offscreen) Set(rt RenderTarget) {
-	o.currentRenderTarget = rt
-}
-
-func (o *Offscreen) SetMainFramebuffer() {
-	o.Set(o.mainFramebuffer)
-}
-
-func (o *Offscreen) DrawTexture(texture Texture,
-	geometryMatrix matrix.Geometry, colorMatrix matrix.Color) {
-	o.currentRenderTarget.SetAsViewport()
-	projectionMatrix := o.currentRenderTarget.ProjectionMatrix()
-	texture.Draw(projectionMatrix, geometryMatrix, colorMatrix)
-}
-
-func (o *Offscreen) DrawTextureParts(texture Texture,
-	parts []graphics.TexturePart,
-	geometryMatrix matrix.Geometry, colorMatrix matrix.Color) {
-	o.currentRenderTarget.SetAsViewport()
-	projectionMatrix := o.currentRenderTarget.ProjectionMatrix()
-	texture.DrawParts(parts, projectionMatrix, geometryMatrix, colorMatrix)
-}
-
-func (o *Offscreen) Clear() {
-	o.currentRenderTarget.Clear()
-}
-
-func (o *Offscreen) Fill(r, g, b uint8) {
-	o.currentRenderTarget.Fill(r, g, b)
-}

graphics/opengl/rendertarget/render_target.go

@@ -7,9 +7,17 @@ import "C"
 import (
 	"fmt"
 	"github.com/hajimehoshi/go-ebiten/graphics"
+	"github.com/hajimehoshi/go-ebiten/graphics/matrix"
 	"math"
 )
 
+type Texture interface {
+	Draw(projectionMatrix [4][4]float64,
+		geometryMatrix matrix.Geometry, colorMatrix matrix.Color)
+	DrawParts(parts []graphics.TexturePart, projectionMatrix [4][4]float64,
+		geometryMatrix matrix.Geometry, colorMatrix matrix.Color)
+}
+
 type NativeTexture C.GLuint
 
 type RenderTarget struct {
@@ -97,10 +105,6 @@ func (r *RenderTarget) Dispose() {
 	C.glDeleteFramebuffers(1, &r.framebuffer)
 }
 
-func (r *RenderTarget) Clear() {
-	r.Fill(0, 0, 0)
-}
-
 func (r *RenderTarget) Fill(red, green, blue uint8) {
 	r.SetAsViewport()
 	const max = float64(math.MaxUint8)
@@ -111,3 +115,18 @@ func (r *RenderTarget) Fill(red, green, blue uint8) {
 		1)
 	C.glClear(C.GL_COLOR_BUFFER_BIT)
 }
+
+func (r *RenderTarget) DrawTexture(texture Texture,
+	geometryMatrix matrix.Geometry, colorMatrix matrix.Color) {
+	r.SetAsViewport()
+	projectionMatrix := r.ProjectionMatrix()
+	texture.Draw(projectionMatrix, geometryMatrix, colorMatrix)
+}
+
+func (r *RenderTarget) DrawTextureParts(texture Texture,
+	parts []graphics.TexturePart,
+	geometryMatrix matrix.Geometry, colorMatrix matrix.Color) {
+	r.SetAsViewport()
+	projectionMatrix := r.ProjectionMatrix()
+	texture.DrawParts(parts, projectionMatrix, geometryMatrix, colorMatrix)
+}