From 57c8c089e966c4c75d9ae3332c3991e2fdc17c88 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Tue, 6 Nov 2018 03:18:45 +0900
Subject: [PATCH] opengl: Unexport BlendFunc

---
 internal/graphicscommand/command.go | 3 +--
 internal/opengl/context_desktop.go  | 4 ++--
 internal/opengl/context_js.go       | 4 ++--
 internal/opengl/context_mobile.go   | 4 ++--
 internal/opengl/program.go          | 3 ++-
 5 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/internal/graphicscommand/command.go b/internal/graphicscommand/command.go
index 1081962e0..54ccf2688 100644
--- a/internal/graphicscommand/command.go
+++ b/internal/graphicscommand/command.go
@@ -233,7 +233,6 @@ func (c *drawImageCommand) Exec(indexOffsetInBytes int) error {
 	if err := c.dst.image.SetViewport(); err != nil {
 		return err
 	}
-	opengl.GetContext().BlendFunc(c.mode)
 
 	if c.nindices == 0 {
 		return nil
@@ -241,7 +240,7 @@ func (c *drawImageCommand) Exec(indexOffsetInBytes int) error {
 	proj := c.dst.image.ProjectionMatrix()
 	dw, dh := c.dst.Size()
 	sw, sh := c.src.Size()
-	opengl.UseProgram(proj, c.src.image, dw, dh, sw, sh, c.color, c.filter)
+	opengl.UseProgram(c.mode, proj, c.src.image, dw, dh, sw, sh, c.color, c.filter)
 	opengl.GetContext().DrawElements(c.nindices, indexOffsetInBytes)
 
 	// glFlush() might be necessary at least on MacBook Pro (a smilar problem at #419),
diff --git a/internal/opengl/context_desktop.go b/internal/opengl/context_desktop.go
index 9199e4f2c..db9debe01 100644
--- a/internal/opengl/context_desktop.go
+++ b/internal/opengl/context_desktop.go
@@ -102,7 +102,7 @@ func (c *Context) reset() error {
 		gl.Enable(gl.BLEND)
 		return nil
 	})
-	c.BlendFunc(graphics.CompositeModeSourceOver)
+	c.blendFunc(graphics.CompositeModeSourceOver)
 	_ = mainthread.Run(func() error {
 		f := int32(0)
 		gl.GetIntegerv(gl.FRAMEBUFFER_BINDING, &f)
@@ -112,7 +112,7 @@ func (c *Context) reset() error {
 	return nil
 }
 
-func (c *Context) BlendFunc(mode graphics.CompositeMode) {
+func (c *Context) blendFunc(mode graphics.CompositeMode) {
 	_ = mainthread.Run(func() error {
 		if c.lastCompositeMode == mode {
 			return nil
diff --git a/internal/opengl/context_js.go b/internal/opengl/context_js.go
index a891b1f6f..bda5d85d7 100644
--- a/internal/opengl/context_js.go
+++ b/internal/opengl/context_js.go
@@ -158,13 +158,13 @@ func (c *Context) reset() error {
 	c.ensureGL()
 	gl := c.gl
 	gl.Call("enable", blend)
-	c.BlendFunc(graphics.CompositeModeSourceOver)
+	c.blendFunc(graphics.CompositeModeSourceOver)
 	f := gl.Call("getParameter", framebufferBinding)
 	c.screenFramebuffer = framebufferNative(f)
 	return nil
 }
 
-func (c *Context) BlendFunc(mode graphics.CompositeMode) {
+func (c *Context) blendFunc(mode graphics.CompositeMode) {
 	if c.lastCompositeMode == mode {
 		return
 	}
diff --git a/internal/opengl/context_mobile.go b/internal/opengl/context_mobile.go
index b49246f4d..4b3125ae0 100644
--- a/internal/opengl/context_mobile.go
+++ b/internal/opengl/context_mobile.go
@@ -111,14 +111,14 @@ func (c *Context) reset() error {
 	c.lastViewportHeight = 0
 	c.lastCompositeMode = graphics.CompositeModeUnknown
 	c.gl.Enable(mgl.BLEND)
-	c.BlendFunc(graphics.CompositeModeSourceOver)
+	c.blendFunc(graphics.CompositeModeSourceOver)
 	f := c.gl.GetInteger(mgl.FRAMEBUFFER_BINDING)
 	c.screenFramebuffer = framebufferNative(mgl.Framebuffer{uint32(f)})
 	// TODO: Need to update screenFramebufferWidth/Height?
 	return nil
 }
 
-func (c *Context) BlendFunc(mode graphics.CompositeMode) {
+func (c *Context) blendFunc(mode graphics.CompositeMode) {
 	gl := c.gl
 	if c.lastCompositeMode == mode {
 		return
diff --git a/internal/opengl/program.go b/internal/opengl/program.go
index 2713c391b..f6b0c02a1 100644
--- a/internal/opengl/program.go
+++ b/internal/opengl/program.go
@@ -265,7 +265,8 @@ func BufferSubData(vertices []float32, indices []uint16) {
 	c.elementArrayBufferSubData(indices)
 }
 
-func UseProgram(proj []float32, src *Image, dstW, dstH, srcW, srcH int, colorM *affine.ColorM, filter graphics.Filter) {
+func UseProgram(mode graphics.CompositeMode, proj []float32, src *Image, dstW, dstH, srcW, srcH int, colorM *affine.ColorM, filter graphics.Filter) {
+	GetContext().blendFunc(mode)
 	theOpenGLState.useProgram(proj, src.textureNative, dstW, dstH, srcW, srcH, colorM, filter)
 }