core_func_packing Module Reference
Provides GLSL functions to pack and unpack half, single and double-precision floating point values into more compact integer types.
These functions do not operate component-wise, rather as described in each case.
Include < glm/packing.hpp > to use these core features.
Public Member Functions
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GLM_FUNC_QUALIFIER uintpackUnorm2x16 (vec2 const &v)
First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values. Then, the results are packed into the returned 32-bit unsigned integer.
The conversion for component c of v to fixed point is done as follows: packUnorm2x16: round(clamp(c, 0, +1) * 65535.0)
The first component of the vector will be written to the least significant bits of the output; the last component will be written to the most significant bits.
- See Also
- See Also
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
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GLM_FUNC_QUALIFIER uintpackSnorm2x16 (vec2 const &v)
First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values. Then, the results are packed into the returned 32-bit unsigned integer.
The conversion for component c of v to fixed point is done as follows: packSnorm2x16: round(clamp(v, -1, +1) * 32767.0)
The first component of the vector will be written to the least significant bits of the output; the last component will be written to the most significant bits.
- See Also
- See Also
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
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GLM_FUNC_QUALIFIER uintpackUnorm4x8 (vec4 const &v)
First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values. Then, the results are packed into the returned 32-bit unsigned integer.
The conversion for component c of v to fixed point is done as follows: packUnorm4x8: round(clamp(c, 0, +1) * 255.0)
The first component of the vector will be written to the least significant bits of the output; the last component will be written to the most significant bits.
- See Also
- See Also
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
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GLM_FUNC_QUALIFIER uintpackSnorm4x8 (vec4 const &v)
First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values. Then, the results are packed into the returned 32-bit unsigned integer.
The conversion for component c of v to fixed point is done as follows: packSnorm4x8: round(clamp(c, -1, +1) * 127.0)
The first component of the vector will be written to the least significant bits of the output; the last component will be written to the most significant bits.
- See Also
- See Also
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
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GLM_FUNC_QUALIFIER vec2unpackUnorm2x16 (uint p)
First, unpacks a single 32-bit unsigned integer p into a pair of 16-bit unsigned integers, four 8-bit unsigned integers, or four 8-bit signed integers. Then, each component is converted to a normalized floating-point value to generate the returned two- or four-component vector.
The conversion for unpacked fixed-point value f to floating point is done as follows: unpackUnorm2x16: f / 65535.0
The first component of the returned vector will be extracted from the least significant bits of the input; the last component will be extracted from the most significant bits.
- See Also
- See Also
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
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GLM_FUNC_QUALIFIER vec2unpackSnorm2x16 (uint p)
First, unpacks a single 32-bit unsigned integer p into a pair of 16-bit unsigned integers, four 8-bit unsigned integers, or four 8-bit signed integers. Then, each component is converted to a normalized floating-point value to generate the returned two- or four-component vector.
The conversion for unpacked fixed-point value f to floating point is done as follows: unpackSnorm2x16: clamp(f / 32767.0, -1, +1)
The first component of the returned vector will be extracted from the least significant bits of the input; the last component will be extracted from the most significant bits.
- See Also
- See Also
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
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GLM_FUNC_QUALIFIER vec4unpackUnorm4x8 (uint p)
First, unpacks a single 32-bit unsigned integer p into a pair of 16-bit unsigned integers, four 8-bit unsigned integers, or four 8-bit signed integers. Then, each component is converted to a normalized floating-point value to generate the returned two- or four-component vector.
The conversion for unpacked fixed-point value f to floating point is done as follows: unpackUnorm4x8: f / 255.0
The first component of the returned vector will be extracted from the least significant bits of the input; the last component will be extracted from the most significant bits.
- See Also
- See Also
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
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GLM_FUNC_QUALIFIER glm::vec4unpackSnorm4x8 (uint p)
First, unpacks a single 32-bit unsigned integer p into a pair of 16-bit unsigned integers, four 8-bit unsigned integers, or four 8-bit signed integers. Then, each component is converted to a normalized floating-point value to generate the returned two- or four-component vector.
The conversion for unpacked fixed-point value f to floating point is done as follows: unpackSnorm4x8: clamp(f / 127.0, -1, +1)
The first component of the returned vector will be extracted from the least significant bits of the input; the last component will be extracted from the most significant bits.
- See Also
- See Also
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
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GLM_FUNC_QUALIFIER doublepackDouble2x32 (uvec2 const &v)
Returns a double-qualifier value obtained by packing the components of v into a 64-bit value. If an IEEE 754 Inf or NaN is created, it will not signal, and the resulting floating point value is unspecified. Otherwise, the bit- level representation of v is preserved. The first vector component specifies the 32 least significant bits; the second component specifies the 32 most significant bits.
- See Also
- See Also
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
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GLM_FUNC_QUALIFIER uvec2unpackDouble2x32 (double v)
Returns a two-component unsigned integer vector representation of v. The bit-level representation of v is preserved. The first component of the vector contains the 32 least significant bits of the double; the second component consists the 32 most significant bits.
- See Also
- See Also
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
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GLM_FUNC_QUALIFIER uintpackHalf2x16 (vec2 const &v)
Returns an unsigned integer obtained by converting the components of a two-component floating-point vector to the 16-bit floating-point representation found in the OpenGL Specification, and then packing these two 16- bit integers into a 32-bit unsigned integer. The first vector component specifies the 16 least-significant bits of the result; the second component specifies the 16 most-significant bits.
- See Also
- See Also
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
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GLM_FUNC_QUALIFIER vec2unpackHalf2x16 (uint v)
Returns a two-component floating-point vector with components obtained by unpacking a 32-bit unsigned integer into a pair of 16-bit values, interpreting those values as 16-bit floating-point numbers according to the OpenGL Specification, and converting them to 32-bit floating-point values. The first component of the vector is obtained from the 16 least-significant bits of v; the second component is obtained from the 16 most-significant bits of v.
- See Also
- See Also
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions