From c3b52343dceaae253df9324a417a526f13c52333 Mon Sep 17 00:00:00 2001
From: Johannes Schickel
Date: Fri, 24 Feb 2012 01:44:17 +0100
Subject: IPHONE: Only update on screen mouse coordinates when it's needed.

---
 backends/platform/iphone/iphone_video.h  |  2 ++
 backends/platform/iphone/iphone_video.mm | 41 ++++++++++++++++----------------
 backends/platform/iphone/osys_video.mm   |  2 +-
 3 files changed, 24 insertions(+), 21 deletions(-)

diff --git a/backends/platform/iphone/iphone_video.h b/backends/platform/iphone/iphone_video.h
index 135f4e64c3..168f9a4244 100644
--- a/backends/platform/iphone/iphone_video.h
+++ b/backends/platform/iphone/iphone_video.h
@@ -60,6 +60,7 @@
 	GLfloat _overlayTexCoords[4 * 2];
 	CGRect _overlayRect;
 
+	GLfloat _mouseVertCoords[4 * 2];
 	GLfloat _mouseTexCoords[4 * 2];
 	GLint _mouseHotspotX, _mouseHotspotY;
 	GLint _mouseWidth, _mouseHeight;
@@ -85,6 +86,7 @@
 - (void)updateMouseSurface;
 - (void)clearColorBuffer;
 
+- (void)notifyMouseMove;
 - (void)updateMouseCursorScaling;
 - (void)updateMouseCursor;
 
diff --git a/backends/platform/iphone/iphone_video.mm b/backends/platform/iphone/iphone_video.mm
index da954199ea..3aa76681ab 100644
--- a/backends/platform/iphone/iphone_video.mm
+++ b/backends/platform/iphone/iphone_video.mm
@@ -217,6 +217,11 @@ const char *iPhone_getDocumentsDir() {
 	    _overlayTexCoords[4] = _overlayTexCoords[5] =
 	    _overlayTexCoords[6] = _overlayTexCoords[7] = 0;
 
+	_mouseVertCoords[0] = _mouseVertCoords[1] =
+	    _mouseVertCoords[2] = _mouseVertCoords[3] =
+	    _mouseVertCoords[4] = _mouseVertCoords[5] =
+	    _mouseVertCoords[6] = _mouseVertCoords[7] = 0;
+
 	_mouseTexCoords[0] = _mouseTexCoords[1] =
 	    _mouseTexCoords[2] = _mouseTexCoords[3] =
 	    _mouseTexCoords[4] = _mouseTexCoords[5] =
@@ -304,6 +309,16 @@ const char *iPhone_getDocumentsDir() {
 
 }
 
+- (void)notifyMouseMove {
+	const GLint mouseX = (GLint)(_videoContext.mouseX * _mouseScaleX) - _mouseHotspotX;
+	const GLint mouseY = (GLint)(_videoContext.mouseY * _mouseScaleY) - _mouseHotspotY;
+
+	_mouseVertCoords[0] = _mouseVertCoords[4] = mouseX;
+	_mouseVertCoords[1] = _mouseVertCoords[3] = mouseY;
+	_mouseVertCoords[2] = _mouseVertCoords[6] = mouseX + _mouseWidth;
+	_mouseVertCoords[5] = _mouseVertCoords[7] = mouseY + _mouseHeight;
+}
+
 - (void)updateMouseCursorScaling {
 	CGRect *rect;
 	int maxWidth, maxHeight;
@@ -338,6 +353,11 @@ const char *iPhone_getDocumentsDir() {
 	// since the hotspot offset is substracted from the position.
 	_mouseHotspotX -= (GLint)CGRectGetMinX(*rect);
 	_mouseHotspotY -= (GLint)CGRectGetMinY(*rect);
+
+	// FIXME: For now we also adapt the mouse position here. In reality we
+	// would be better off to also adjust the event position when switching
+	// from overlay to game screen or vica versa.
+	[self notifyMouseMove];
 }
 
 - (void)updateMouseCursor {
@@ -378,26 +398,7 @@ const char *iPhone_getDocumentsDir() {
 }
 
 - (void)updateMouseSurface {
-	int mouseX = _videoContext.mouseX;
-	int mouseY = _videoContext.mouseY;
-
-	mouseX = (int)(mouseX * _mouseScaleX) - _mouseHotspotX;
-	mouseY = (int)(mouseY * _mouseScaleY) - _mouseHotspotY;
-
-	GLfloat vertices[] = {
-		// Top left
-		mouseX              , mouseY,
-		// Top right
-		mouseX + _mouseWidth, mouseY,
-		// Bottom left
-		mouseX              , mouseY + _mouseHeight,
-		// Bottom right
-		mouseX + _mouseWidth, mouseY + _mouseHeight
-	};
-
-	//printf("Cursor: width %u height %u\n", _videoContext.mouseWidth, _videoContext.mouseHeight);
-
-	glVertexPointer(2, GL_FLOAT, 0, vertices); printOpenGLError();
+	glVertexPointer(2, GL_FLOAT, 0, _mouseVertCoords); printOpenGLError();
 	glTexCoordPointer(2, GL_FLOAT, 0, _mouseTexCoords); printOpenGLError();
 
 	glBindTexture(GL_TEXTURE_2D, _mouseCursorTexture); printOpenGLError();
diff --git a/backends/platform/iphone/osys_video.mm b/backends/platform/iphone/osys_video.mm
index 0efeb78aef..31db4c70e7 100644
--- a/backends/platform/iphone/osys_video.mm
+++ b/backends/platform/iphone/osys_video.mm
@@ -332,9 +332,9 @@ bool OSystem_IPHONE::showMouse(bool visible) {
 
 void OSystem_IPHONE::warpMouse(int x, int y) {
 	//printf("warpMouse()\n");
-
 	_videoContext->mouseX = x;
 	_videoContext->mouseY = y;
+	[g_iPhoneViewInstance performSelectorOnMainThread:@selector(notifyMouseMove) withObject:nil waitUntilDone: YES];
 	_mouseDirty = true;
 }
 
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