diff --git a/src/gl.c b/src/gl.c
index aea90d3..f449db7 100644
--- a/src/gl.c
+++ b/src/gl.c
@@ -146,7 +146,7 @@ int heliGLIsIntegerClipping() {
 	return TRUE;
 }
 
-int heliGLBackTransform(double *x, double *y) {
+int heliGLTransform(double *x, double *y, int reverse) {
 	double proj[16] = {};
 	double model[16] = {};
 	double viewproj[16] = {};
@@ -158,7 +158,7 @@ int heliGLBackTransform(double *x, double *y) {
 		{ *x, *y, 1, 1 } };
 	double vv[2][4] = {};
 	*x = 0; *y = 0;
-
+	
 	int rect[4] = {}; // x, y, w, h
 	glGetIntegerv(GL_VIEWPORT, rect);
 	double hw = 0.5*rect[2], hh = 0.5*rect[3];
@@ -173,9 +173,15 @@ int heliGLBackTransform(double *x, double *y) {
 	heliMatrix4Mult(viewproj, view, proj);
 	heliMatrix4Mult(viewmodel, viewproj, model);
 	
-	if (!heliMatrix4Invert(inv, viewmodel)) return FALSE;
-	heliMatrix4MultVec(vv[0], inv, v[0]);
-	heliMatrix4MultVec(vv[1], inv, v[1]);
+	if (reverse) {
+		if (!heliMatrix4Invert(inv, viewmodel))
+			return FALSE;
+		heliMatrix4MultVec(vv[0], inv, v[0]);
+		heliMatrix4MultVec(vv[1], inv, v[1]);
+	} else {
+		heliMatrix4MultVec(vv[0], viewmodel, v[0]);
+		heliMatrix4MultVec(vv[1], viewmodel, v[1]);
+	}
 	
 	double l = vv[0][2] - vv[1][2];
 	if (fabs(l) <= HELI_PRECISION) return FALSE;
diff --git a/src/private.h b/src/private.h
index 7fcfa66..e7301d7 100644
--- a/src/private.h
+++ b/src/private.h
@@ -172,7 +172,7 @@ extern unsigned int heliGLWindowFramebufferDrawId;
 double heliGLGetAAResolution();
 double heliGLGetPixelSize();
 int heliGLIsIntegerClipping();
-int heliGLBackTransform(double *x, double *y);
+int heliGLTransform(double *x, double *y, int reverse);
 void heliGLGetCommonState(HeliGLCommonState *state, unsigned int flags);
 void heliGLSetCommonState(const HeliGLCommonState *state);
 
diff --git a/src/window.c b/src/window.c
index 333d4cf..8c4c945 100644
--- a/src/window.c
+++ b/src/window.c
@@ -229,16 +229,31 @@ double mouseY()
 
 double mouseTransformedX() {
 	double x = mouseX(), y = mouseY();
-	heliGLBackTransform(&x, &y);
+	heliGLTransform(&x, &y, TRUE);
 	return x;
 }
 
 double mouseTransformedY() {
 	double x = mouseX(), y = mouseY();
-	heliGLBackTransform(&x, &y);
+	heliGLTransform(&x, &y, TRUE);
 	return y;
 }
 
+void mouseWarp(double x, double y) {
+	if (isnan(x)) x = 0;
+	if (isnan(y)) y = 0;
+	if (started && !stopped && window)
+		SDL_WarpMouseInWindow(window, (int)x, (int)y);
+	_mouseX = x;
+	_mouseY = y;
+}
+
+void mouseTransformedWarp(double x, double y) {
+	heliGLTransform(&x, &y, FALSE);
+	mouseWarp(x, y);
+}
+
+
 static void resize(int w, int h) {
 	w = w > minWidth ? w : minWidth;
 	h = h > minHeight ? h : minHeight;
diff --git a/src/window.h b/src/window.h
index ec90965..9fdfc14 100644
--- a/src/window.h
+++ b/src/window.h
@@ -39,9 +39,10 @@ int mouseScrolledX();
 int mouseScrolledY();
 double mouseX();
 double mouseY();
-
 double mouseTransformedX();
 double mouseTransformedY();
+void mouseWarp(double x, double y);
+void mouseTransformedWarp(double x, double y);
 
 void messageBox(const char *message);
 int questionBox(const char *question, const char *answer0, const char *answer1);