From e0d97d42dd59b6cb048e97fe7a4612ad4f53aef7 Mon Sep 17 00:00:00 2001
From: RadialApps <radialapps@gmail.com>
Date: Wed, 14 Jun 2017 15:50:16 +0530
Subject: [PATCH] Allow Downsizing Textures For some reason, this leads to a
 huge performance benefit on mobile devices, especially when using MegaSurface

---
 src/sharedstate.cpp | 35 +++++++++++------------------------
 src/window.cpp      | 27 +++++++--------------------
 2 files changed, 18 insertions(+), 44 deletions(-)

diff --git a/src/sharedstate.cpp b/src/sharedstate.cpp
index 0778da9..68d1097 100644
--- a/src/sharedstate.cpp
+++ b/src/sharedstate.cpp
@@ -263,39 +263,26 @@ void SharedState::bindTex()
 
 void SharedState::ensureTexSize(int minW, int minH, Vec2i &currentSizeOut)
 {
-	if (minW > p->globalTexW)
+	minW = findNextPow2(minW); minH = findNextPow2(minH);
+	
+	if (minW != p->globalTexW || minH != p->globalTexH)
 	{
+		p->globalTexW = minW;
+		p->globalTexH = minH;
 		p->globalTexDirty = true;
-		p->globalTexW = findNextPow2(minW);
 	}
-
-	if (minH > p->globalTexH)
-	{
-		p->globalTexDirty = true;
-		p->globalTexH = findNextPow2(minH);
-	}
-
+	
 	currentSizeOut = Vec2i(p->globalTexW, p->globalTexH);
 }
 
 TEXFBO &SharedState::gpTexFBO(int minW, int minH)
 {
-	bool needResize = false;
-
-	if (minW > p->gpTexFBO.width)
-	{
-		p->gpTexFBO.width = findNextPow2(minW);
-		needResize = true;
-	}
-
-	if (minH > p->gpTexFBO.height)
-	{
-		p->gpTexFBO.height = findNextPow2(minH);
-		needResize = true;
-	}
-
-	if (needResize)
+	minW = findNextPow2(minW); minH = findNextPow2(minH);
+	
+	if (minW != p->gpTexFBO.width || minH != p->gpTexFBO.height)
 	{
+		p->gpTexFBO.width = minW;
+		p->gpTexFBO.height = minH;
 		TEX::bind(p->gpTexFBO.tex);
 		TEX::allocEmpty(p->gpTexFBO.width, p->gpTexFBO.height);
 	}
diff --git a/src/window.cpp b/src/window.cpp
index 71a8cc9..9c450d0 100644
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -388,29 +388,16 @@ struct WindowPrivate
 
 	void ensureBaseTexReady()
 	{
-		/* Make sure texture is big enough */
-		int newW = baseTex.width;
-		int newH = baseTex.height;
-		bool resizeNeeded = false;
+		/* Make sure texture is properly sized */
+		int newW = findNextPow2(size.x);
+		int newH = findNextPow2(size.y);
 
-		if (size.x > baseTex.width)
+		if (newW != baseTex.width || newH != baseTex.height)
 		{
-			newW = findNextPow2(size.x);
-			resizeNeeded = true;
+			shState->texPool().release(baseTex);
+			baseTex = shState->texPool().request(newW, newH);
+			baseTexDirty = true;
 		}
-		if (size.y > baseTex.height)
-		{
-			newH = findNextPow2(size.y);
-			resizeNeeded = true;
-		}
-
-		if (!resizeNeeded)
-			return;
-
-		shState->texPool().release(baseTex);
-		baseTex = shState->texPool().request(newW, newH);
-
-		baseTexDirty = true;
 	}
 
 	void redrawBaseTex()