1 files changed, 66 insertions, 0 deletions
diff --git a/ANGLE/src/libGLESv2/mathutil.h b/ANGLE/src/libGLESv2/mathutil.h
new file mode 100644
index 0000000..31fa16f
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+++ b/ANGLE/src/libGLESv2/mathutil.h
@@ -0,0 +1,66 @@
+//
+// Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// mathutil.h: Math and bit manipulation functions.
+
+#ifndef LIBGLESV2_MATHUTIL_H_
+#define LIBGLESV2_MATHUTIL_H_
+
+#include <math.h>
+
+namespace gl
+{
+inline bool isPow2(int x)
+{
+    return (x & (x - 1)) == 0 && (x != 0);
+}
+
+inline int log2(int x)
+{
+    int r = 0;
+    while ((x >> r) > 1) r++;
+    return r;
+}
+
+inline unsigned int ceilPow2(unsigned int x)
+{
+    if (x != 0) x--;
+    x |= x >> 1;
+    x |= x >> 2;
+    x |= x >> 4;
+    x |= x >> 8;
+    x |= x >> 16;
+    x++;
+
+    return x;
+}
+
+inline float clamp01(float x)
+{
+    return x < 0 ? 0 : (x > 1 ? 1 : x);
+}
+
+template<const int n>
+inline unsigned int unorm(float x)
+{
+    const unsigned int max = 0xFFFFFFFF >> (32 - n);
+
+    if (x > 1)
+    {
+        return max;
+    }
+    else if (x < 0)
+    {
+        return 0;
+    }
+    else
+    {
+        return (unsigned int)(max * x + 0.5f);
+    }
+}
+}
+
+#endif   // LIBGLESV2_MATHUTIL_H_