Refactoring

graphics/opengl/context.go

@@ -23,29 +23,26 @@ type Context struct {
 	screenId     graphics.RenderTargetId
 	defaultId    graphics.RenderTargetId
 	currentId    graphics.RenderTargetId
-	ids          *ids
 	screenWidth  int
 	screenHeight int
 	screenScale  int
 }
 
-func newContext(ids *ids, screenWidth, screenHeight, screenScale int) *Context {
+func NewContext(screenWidth, screenHeight, screenScale int) *Context {
 	context := &Context{
-		ids:          ids,
 		screenWidth:  screenWidth,
 		screenHeight: screenHeight,
 		screenScale:  screenScale,
 	}
 	defaultRenderTarget := &RenderTarget{
-		framebuffer: C.GLuint(0),
 		width:  screenWidth * screenScale,
 		height: screenHeight * screenScale,
 		flipY:  true,
 	}
-	context.defaultId = context.ids.addRenderTarget(defaultRenderTarget)
+	context.defaultId = idsInstance.addRenderTarget(defaultRenderTarget)
 
 	var err error
-	context.screenId, err = ids.createRenderTarget(
+	context.screenId, err = idsInstance.createRenderTarget(
 		screenWidth, screenHeight, graphics.FilterNearest)
 	if err != nil {
 		panic("initializing the offscreen failed: " + err.Error())
@@ -60,7 +57,7 @@ func newContext(ids *ids, screenWidth, screenHeight, screenScale int) *Context {
 
 func (c *Context) Dispose() {
 	// TODO: remove the default framebuffer?
-	c.ids.deleteRenderTarget(c.screenId)
+	idsInstance.deleteRenderTarget(c.screenId)
 }
 
 func (c *Context) Update(draw func(graphics.Context)) {
@@ -90,7 +87,7 @@ func (c *Context) Clear() {
 }
 
 func (c *Context) Fill(r, g, b uint8) {
-	c.ids.fillRenderTarget(c.currentId, r, g, b)
+	idsInstance.fillRenderTarget(c.currentId, r, g, b)
 }
 
 func (c *Context) Texture(id graphics.TextureId) graphics.Drawer {
@@ -98,7 +95,7 @@ func (c *Context) Texture(id graphics.TextureId) graphics.Drawer {
 }
 
 func (c *Context) RenderTarget(id graphics.RenderTargetId) graphics.Drawer {
-	return &textureWithContext{c.ids.toTexture(id), c}
+	return &textureWithContext{idsInstance.toTexture(id), c}
 }
 
 func (c *Context) ResetOffscreen() {
@@ -118,5 +115,5 @@ func (t *textureWithContext) Draw(
 	parts []graphics.TexturePart,
 	geo matrix.Geometry,
 	color matrix.Color) {
-	t.context.ids.drawTexture(t.context.currentId, t.id, parts, geo, color)
+	idsInstance.drawTexture(t.context.currentId, t.id, parts, geo, color)
 }

graphics/opengl/ids.go

@@ -13,10 +13,30 @@ import (
 	"sync"
 )
 
-var idsInstance *ids = newIds()
+func glMatrix(matrix [4][4]float64) [16]float32 {
+	result := [16]float32{}
+	for j := 0; j < 4; j++ {
+		for i := 0; i < 4; i++ {
+			result[i+j*4] = float32(matrix[i][j])
+		}
+	}
+	return result
+}
 
-func NewContext(screenWidth, screenHeight, screenScale int) *Context {
-	return newContext(idsInstance, screenWidth, screenHeight, screenScale)
+type ids struct {
+	textures              map[graphics.TextureId]*Texture
+	renderTargets         map[graphics.RenderTargetId]*RenderTarget
+	renderTargetToTexture map[graphics.RenderTargetId]graphics.TextureId
+	lastId                int
+	currentRenderTargetId graphics.RenderTargetId
+	sync.RWMutex
+}
+
+var idsInstance = &ids{
+	textures:              map[graphics.TextureId]*Texture{},
+	renderTargets:         map[graphics.RenderTargetId]*RenderTarget{},
+	renderTargetToTexture: map[graphics.RenderTargetId]graphics.TextureId{},
+	currentRenderTargetId: -1,
 }
 
 func CreateRenderTarget(
@@ -31,26 +51,6 @@ func CreateTexture(
 	return idsInstance.createTexture(img, filter)
 }
 
-type ids struct {
-	textures              map[graphics.TextureId]*Texture
-	renderTargets         map[graphics.RenderTargetId]*RenderTarget
-	renderTargetToTexture map[graphics.RenderTargetId]graphics.TextureId
-	lastId                int
-	currentRenderTargetId graphics.RenderTargetId
-	sync.RWMutex
-}
-
-func newIds() *ids {
-	ids := &ids{
-		textures:              map[graphics.TextureId]*Texture{},
-		renderTargets:         map[graphics.RenderTargetId]*RenderTarget{},
-		renderTargetToTexture: map[graphics.RenderTargetId]graphics.TextureId{},
-		lastId:                0,
-		currentRenderTargetId: -1,
-	}
-	return ids
-}
-
 func (i *ids) textureAt(id graphics.TextureId) *Texture {
 	i.RLock()
 	defer i.RUnlock()
@@ -94,7 +94,11 @@ func (i *ids) createRenderTarget(width, height int, filter graphics.Filter) (
 	framebuffer := createFramebuffer(texture.native)
 	// The current binded framebuffer can be changed.
 	i.currentRenderTargetId = -1
-	renderTarget := &RenderTarget{framebuffer, texture.width, texture.height, false}
+	renderTarget := &RenderTarget{
+		framebuffer: framebuffer,
+		width:       texture.width,
+		height:      texture.height,
+	}
 
 	i.Lock()
 	defer i.Unlock()

graphics/opengl/render_target.go

@@ -9,16 +9,6 @@ import (
 	"github.com/hajimehoshi/go-ebiten/graphics"
 )
 
-func glMatrix(matrix [4][4]float64) [16]float32 {
-	result := [16]float32{}
-	for j := 0; j < 4; j++ {
-		for i := 0; i < 4; i++ {
-			result[i+j*4] = float32(matrix[i][j])
-		}
-	}
-	return result
-}
-
 type RenderTarget struct {
 	framebuffer C.GLuint
 	width       int

readme.rm

@@ -9,6 +9,11 @@ Please read example/main.go and example/blocks/*.
 Be careful that this library is now being developed actively and API can be
 changed easily.
 
+## How to execute the example
+
+ :; cd example
+ :; go run *.go
+
 ## License
 
 Copyright 2014 Hajime Hoshi