1 files changed, 24 insertions, 0 deletions
diff --git a/src/VBox/GuestHost/OpenGL/util/warp.c b/src/VBox/GuestHost/OpenGL/util/warp.c
new file mode 100644
index 00000000..0e008db9
--- /dev/null
+++ b/src/VBox/GuestHost/OpenGL/util/warp.c
@@ -0,0 +1,24 @@
+/* Copyright (c) 2001, Stanford University
+ * All rights reserved
+ *
+ * See the file LICENSE.txt for information on redistributing this software.
+ */
+
+#include "cr_error.h"
+#include "cr_warp.h"
+
+void
+crWarpPoint(const float *align, const float *point, float *result)
+{
+	float w, x, y;
+
+	x = align[0] * point[0] + align[1] * point[1] + align[2];
+	y = align[3] * point[0] + align[4] * point[1] + align[5];
+	w = align[6] * point[0] + align[7] * point[1] + align[8];
+
+	if (w == 0)
+		crError("Crud in alignment matrix --> w == 0. bleh!");
+
+	result[0] = x / w;
+	result[1] = y / w;
+}