From 7f5719faddbc75c573613028948ec594c461e34b Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Sat, 14 Apr 2018 17:59:10 +0900
Subject: [PATCH] graphics: Call glFlush after glTexSubImage2D for MacBook Pro

---
 internal/graphics/command.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/internal/graphics/command.go b/internal/graphics/command.go
index bc77c74f9..77d448f88 100644
--- a/internal/graphics/command.go
+++ b/internal/graphics/command.go
@@ -149,7 +149,17 @@ func (q *commandQueue) Flush() error {
 		}
 		numc := len(g)
 		indexOffsetInBytes := 0
+		var lastC command
 		for _, c := range g {
+			// On MacBook Pro (2013 Late?), glTexSubImage2D might not be finished
+			// before the next different comand. Call glFlush explicitly.
+			if _, ok := lastC.(*replacePixelsCommand); ok {
+				if _, ok := c.(*replacePixelsCommand); !ok {
+					opengl.GetContext().Flush()
+				}
+			}
+			lastC = c
+
 			if err := c.Exec(indexOffsetInBytes); err != nil {
 				return err
 			}