From f6523b28f4d26094610d1ef0c776aec9278b85df Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@hajimehoshi.com>
Date: Sun, 27 Oct 2013 22:12:28 +0900
Subject: [PATCH] Add texture.NewEmpty

---
 graphics/opengl/context.go                    | 3 +--
 graphics/opengl/rendertarget/render_target.go | 6 +++---
 graphics/opengl/texture/texture.go            | 7 +++++++
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/graphics/opengl/context.go b/graphics/opengl/context.go
index a4713a86a..edb58a4b8 100644
--- a/graphics/opengl/context.go
+++ b/graphics/opengl/context.go
@@ -52,8 +52,7 @@ func (context *Context) Init() {
 	context.mainFramebufferTexture, err = rendertarget.NewWithFramebuffer(
 		context.screenWidth*context.screenScale,
 		context.screenHeight*context.screenScale,
-		rendertarget.Framebuffer(mainFramebuffer),
-		texture.FilterLinear)
+		rendertarget.Framebuffer(mainFramebuffer))
 	if err != nil {
 		panic("creating main framebuffer failed: " + err.Error())
 	}
diff --git a/graphics/opengl/rendertarget/render_target.go b/graphics/opengl/rendertarget/render_target.go
index 46ef34860..717a36959 100644
--- a/graphics/opengl/rendertarget/render_target.go
+++ b/graphics/opengl/rendertarget/render_target.go
@@ -46,9 +46,9 @@ func New(width, height int, filter texture.Filter) (
 		Framebuffer(framebuffer.(C.GLuint))), tex, nil
 }
 
-func NewWithFramebuffer(width, height int, framebuffer Framebuffer,
-	filter texture.Filter) (*rendertarget.RenderTarget, error) {
-	tex, err := texture.New(width, height, filter)
+func NewWithFramebuffer(width, height int, framebuffer Framebuffer) (
+	*rendertarget.RenderTarget, error) {
+	tex, err := texture.NewEmpty(width, height)
 	if err != nil {
 		return nil, err
 	}
diff --git a/graphics/opengl/texture/texture.go b/graphics/opengl/texture/texture.go
index fcef9a7cf..b6e2ee9d2 100644
--- a/graphics/opengl/texture/texture.go
+++ b/graphics/opengl/texture/texture.go
@@ -70,6 +70,13 @@ func New(width, height int, filter Filter) (*gtexture.Texture, error) {
 	return gtexture.New(width, height, f)
 }
 
+func NewEmpty(width, height int) (*gtexture.Texture, error) {
+	f := func(textureWidth, textureHeight int) (interface{}, error) {
+		return nil, nil
+	}
+	return gtexture.New(width, height, f)
+}
+
 func NewFromImage(img image.Image) (*gtexture.Texture, error) {
 	return gtexture.NewFromImage(img, createFromImage)
 }