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/**
\file G3D/unorm16.h
\maintainer Morgan McGuire, http://graphics.cs.williams.edu
\created 2012-03-02 by Zina Cigolle
\edited 2012-03-02
Copyright 2000-2012, Morgan McGuire.
All rights reserved.
*/
#ifndef G3D_unorm16_h
#define G3D_unorm16_h
#include "G3D/platform.h"
#include "G3D/g3dmath.h"
namespace G3D {
/** Represents numbers on [0, 1] in 16 bits as an unsigned normalized
0.8 fixed-point value using the same encoding scheme as OpenGL.
Note that arithmetic operations may over and under-flow, just like
uint16 arithmetic.
OpenGL specifications can be found here:
http://www.opengl.org/registry/specs/ARB/shading_language_packing.txt
*/
G3D_BEGIN_PACKED_CLASS(1)
unorm16 {
private:
uint16 m_bits;
/** Private to prevent illogical conversions without explicitly
stating that the input should be treated as bits; see fromBits. */
explicit unorm16(uint16 b) : m_bits(b) {}
public:
/** Equivalent to: \code unorm16 u = reinterpret_cast<const unorm16&>(255);\endcode */
static unorm16 fromBits(uint16 b) {
return unorm16(b);
}
/** \copydoc fromBits */
static unorm16 reinterpretFrom(uint16 b) {
return unorm16(b);
}
unorm16() : m_bits(0) {}
unorm16(const unorm16& other) : m_bits(other.m_bits) {}
explicit unorm16(const class Any& a);
class Any toAny() const;
/** Maps f to round(f * 65535).*/
explicit unorm16(float f) {
m_bits = uint16(clamp(f, 0.0f, 1.0f) * 65535.0f + 0.5f);
}
explicit unorm16(double f) {
m_bits = uint16(clamp(f, 0.0, 1.0) * 65535.0 + 0.5);
}
/** Returns a number on [0.0f, 1.0f] */
operator float() const {
return float(m_bits) * (1.0f / 65535.0f);
}
operator double() const {
return double(m_bits) * (1.0 / 65535.0);
}
static unorm16 one() {
return fromBits(65535);
}
static unorm16 zero() {
return fromBits(0);
}
/**\brief Returns the underlying bits in this representation.
Equivalent to:
\code uint16 i = reinterpret_cast<const uint16&>(u); \endcode */
uint16 bits() const {
return m_bits;
}
/** \copydoc bits */
uint16 reinterpretAsUInt16() const {
return m_bits;
}
bool operator>(const unorm16 other) const {
return m_bits > other.m_bits;
}
bool operator<(const unorm16 other) const {
return m_bits < other.m_bits;
}
bool operator>=(const unorm16 other) const {
return m_bits >= other.m_bits;
}
bool operator<=(const unorm16 other) const {
return m_bits <= other.m_bits;
}
bool operator==(const unorm16 other) const {
return m_bits <= other.m_bits;
}
bool operator!=(const unorm16 other) const {
return m_bits != other.m_bits;
}
unorm16 operator+(const unorm16 other) const {
return unorm16(uint16(m_bits + other.m_bits));
}
unorm16& operator+=(const unorm16 other) {
m_bits += other.m_bits;
return *this;
}
unorm16 operator-(const unorm16 other) const {
return unorm16(uint16(m_bits - other.m_bits));
}
unorm16& operator-=(const unorm16 other) {
m_bits -= other.m_bits;
return *this;
}
unorm16 operator*(const int i) const {
return unorm16(uint16(m_bits * i));
}
unorm16& operator*=(const int i) {
m_bits *= i;
return *this;
}
unorm16 operator/(const int i) const {
return unorm16(uint16(m_bits / i));
}
unorm16& operator/=(const int i) {
m_bits /= i;
return *this;
}
unorm16 operator<<(const int i) const {
return unorm16((uint16)(m_bits << i));
}
unorm16& operator<<=(const int i) {
m_bits <<= i;
return *this;
}
unorm16 operator>>(const int i) const {
return unorm16(uint16(m_bits >> i));
}
unorm16& operator>>=(const int i) {
m_bits >>= i;
return *this;
}
}
G3D_END_PACKED_CLASS(1)
} // namespace G3D
#endif // G3D_unorm16
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