From ab7a3e1ab36320fe75459077a18ed748984fe035 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Sun, 25 Mar 2018 23:55:38 +0900
Subject: [PATCH] graphics: Remove unneeded mutex

---
 internal/graphics/command.go | 10 ----------
 internal/graphics/image.go   |  6 +-----
 2 files changed, 1 insertion(+), 15 deletions(-)

diff --git a/internal/graphics/command.go b/internal/graphics/command.go
index 0099c6ce6..bc77c74f9 100644
--- a/internal/graphics/command.go
+++ b/internal/graphics/command.go
@@ -20,7 +20,6 @@ import (
 	"github.com/hajimehoshi/ebiten/internal/affine"
 	emath "github.com/hajimehoshi/ebiten/internal/math"
 	"github.com/hajimehoshi/ebiten/internal/opengl"
-	"github.com/hajimehoshi/ebiten/internal/sync"
 )
 
 // command represents a drawing command.
@@ -48,8 +47,6 @@ type commandQueue struct {
 	// nvertices must <= len(vertices).
 	// vertices is never shrunk since re-extending a vertices buffer is heavy.
 	nvertices int
-
-	m sync.Mutex
 }
 
 // theCommandQueue is the command queue for the current process.
@@ -72,13 +69,11 @@ func (q *commandQueue) appendVertices(vertices []float32) {
 // EnqueueDrawImageCommand enqueues a drawing-image command.
 func (q *commandQueue) EnqueueDrawImageCommand(dst, src *Image, vertices []float32, color *affine.ColorM, mode opengl.CompositeMode, filter Filter) {
 	// Avoid defer for performance
-	q.m.Lock()
 	q.appendVertices(vertices)
 	if 0 < len(q.commands) {
 		last := q.commands[len(q.commands)-1]
 		if last.CanMerge(dst, src, color, mode, filter) {
 			last.AddNumVertices(len(vertices))
-			q.m.Unlock()
 			return
 		}
 	}
@@ -91,16 +86,13 @@ func (q *commandQueue) EnqueueDrawImageCommand(dst, src *Image, vertices []float
 		filter:    filter,
 	}
 	q.commands = append(q.commands, c)
-	q.m.Unlock()
 }
 
 // Enqueue enqueues a drawing command other than a draw-image command.
 //
 // For a draw-image command, use EnqueueDrawImageCommand.
 func (q *commandQueue) Enqueue(command command) {
-	q.m.Lock()
 	q.commands = append(q.commands, command)
-	q.m.Unlock()
 }
 
 // commandGroups separates q.commands into some groups.
@@ -136,8 +128,6 @@ func (q *commandQueue) commandGroups() [][]command {
 
 // Flush flushes the command queue.
 func (q *commandQueue) Flush() error {
-	q.m.Lock()
-	defer q.m.Unlock()
 	// glViewport must be called at least at every frame on iOS.
 	opengl.GetContext().ResetViewportSize()
 	n := 0
diff --git a/internal/graphics/image.go b/internal/graphics/image.go
index de80ca578..e84631e54 100644
--- a/internal/graphics/image.go
+++ b/internal/graphics/image.go
@@ -18,20 +18,17 @@ import (
 	"github.com/hajimehoshi/ebiten/internal/affine"
 	"github.com/hajimehoshi/ebiten/internal/math"
 	"github.com/hajimehoshi/ebiten/internal/opengl"
-	"github.com/hajimehoshi/ebiten/internal/sync"
 )
 
 var (
 	// maxTextureSize is the maximum texture size
 	//
 	// maxTextureSize also represents the default size (width or height) of viewport.
-	maxTextureSize     = 0
-	maxTextureSizeLock sync.Mutex
+	maxTextureSize = 0
 )
 
 // MaxImageSize returns the maximum of width/height of an image.
 func MaxImageSize() int {
-	maxTextureSizeLock.Lock()
 	if maxTextureSize == 0 {
 		maxTextureSize = opengl.GetContext().MaxTextureSize()
 		if maxTextureSize == 0 {
@@ -39,7 +36,6 @@ func MaxImageSize() int {
 		}
 	}
 	s := maxTextureSize
-	maxTextureSizeLock.Unlock()
 	return s
 }