From efe8866f28f229446440c6d871e4f9845a97266f Mon Sep 17 00:00:00 2001
From: Martin Ashby <martin@martin-laptop.lan>
Date: Mon, 28 May 2018 16:57:07 +0100
Subject: Added build tags. Builds & runs OK on RPi (can show test animation)

---
 unicorn/BaseFakeUnicorn.go |  2 ++
 unicorn/FakeUnicorn2.go    |  6 ++++++
 unicorn/RealUnicorn2.go    |  6 ++++++
 unicorn/Unicorn2.go        | 14 ++++++--------
 4 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/unicorn/BaseFakeUnicorn.go b/unicorn/BaseFakeUnicorn.go
index 7910814..19c1d59 100644
--- a/unicorn/BaseFakeUnicorn.go
+++ b/unicorn/BaseFakeUnicorn.go
@@ -1,3 +1,5 @@
+// +build linux,386 linux,amd64
+
 package unicorn
 
 import "github.com/veandco/go-sdl2/sdl"
diff --git a/unicorn/FakeUnicorn2.go b/unicorn/FakeUnicorn2.go
index 27629d2..1b53376 100644
--- a/unicorn/FakeUnicorn2.go
+++ b/unicorn/FakeUnicorn2.go
@@ -1,3 +1,5 @@
+// +build linux,386 linux,amd64
+
 package unicorn
 
 import (
@@ -37,6 +39,10 @@ func (u *FakeUnicorn2) renderImage(im image.Image) {
 	u.renderer.Present()
 }
 
+func (u *FakeUnicorn2) StartRender() chan bool {
+	return u.StartRenderBase(u.renderImage)
+}
+
 func NewUnicorn2() (*FakeUnicorn2, error) {
 	baseFake, err := NewBaseFakeUnicorn(300, 300)
 	if err != nil {
diff --git a/unicorn/RealUnicorn2.go b/unicorn/RealUnicorn2.go
index 991e79f..861b1d5 100644
--- a/unicorn/RealUnicorn2.go
+++ b/unicorn/RealUnicorn2.go
@@ -60,6 +60,12 @@ func NewUnicorn2() (*RealUnicorn2, error) {
 	}, nil
 }
 
+// StartRender ...
+// Passes through to base to actually do the render
+func (u *RealUnicorn2) StartRender() chan bool {
+	return u.StartRenderBase(u.renderImage)
+}
+
 // MainLoop ...
 // Just blocks until sigterm
 func (u *RealUnicorn2) MainLoop() {
diff --git a/unicorn/Unicorn2.go b/unicorn/Unicorn2.go
index 04722f7..81e3174 100644
--- a/unicorn/Unicorn2.go
+++ b/unicorn/Unicorn2.go
@@ -42,11 +42,9 @@ func (u *BaseUnicorn2) SetGif(g *gif.GIF) {
 	u.g = g
 }
 
-// StartRender ...
-// Starts rendering the image. If it's an animated image,
-// renders animation frames. Return a channel to stop the
-// image rendering.
-func (u *FakeUnicorn2) StartRender() chan bool {
+// StartRenderBase ...
+// Deals with the timing aspect of animated GIFs
+func (u *BaseUnicorn2) StartRenderBase(renderImage func(image.Image)) chan bool {
 	stopChan := make(chan bool)
 	go func() {
 		timer := time.NewTimer(0)
@@ -61,12 +59,12 @@ func (u *FakeUnicorn2) StartRender() chan bool {
 				gf := u.GetGif()
 				im := gf.Image[imageIndex]
 				delay := gf.Delay[imageIndex] //100ths of a second, 10^-2
-				u.renderImage(im)
-				
+				renderImage(im)
+
 				timer.Reset(time.Duration(delay * 10000000)) // nanoseconds 10^-9 sec
 				imageIndex = (imageIndex + 1) % len(gf.Image)
 			}
 		}
 	}()
 	return stopChan
-}
\ No newline at end of file
+}
-- 
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