From a60976f260f3d9257a87281a4860fac00d7dca8c Mon Sep 17 00:00:00 2001
From: Andrew Gerrand <nf@wh3rd.net>
Date: Thu, 8 Mar 2018 13:53:49 +1100
Subject: [PATCH] internal/graphics: increase defaultViewportSize to 8192
 (#538)

This makes it possible to run ebiten applications in full screen on 5k
displays, such as Apple's 27" iMac.

Fix issue #537
---
 internal/graphics/framebuffer.go | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/internal/graphics/framebuffer.go b/internal/graphics/framebuffer.go
index f8999c55e..320dcc2ee 100644
--- a/internal/graphics/framebuffer.go
+++ b/internal/graphics/framebuffer.go
@@ -70,8 +70,11 @@ func newScreenFramebuffer(width, height int) *framebuffer {
 
 // defaultViewportSize is the default size (width or height) of viewport.
 //
-// defaultViewportSize also represents the maximum size of a framebuffer.
-const defaultViewportSize = 4096
+// defaultViewportSize also represents the maximum size of a framebuffer
+// and of an Image (it is used to declare MaxImageSize).
+//
+// For portability reasons it must be a power of two.
+const defaultViewportSize = 8192
 
 // viewportSize returns the viewport size of the framebuffer.
 func (f *framebuffer) viewportSize() (int, int) {