174 lines
11 KiB
C++
174 lines
11 KiB
C++
/// @ref core
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/// @file glm/packing.hpp
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///
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/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions</a>
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/// @see gtc_packing
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///
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/// @defgroup core_func_packing Floating-Point Pack and Unpack Functions
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/// @ingroup core
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///
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/// Provides GLSL functions to pack and unpack half, single and double-precision floating point values into more compact integer types.
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///
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/// These functions do not operate component-wise, rather as described in each case.
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///
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/// Include <glm/packing.hpp> to use these core features.
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#pragma once
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#include "./ext/vector_uint2.hpp"
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#include "./ext/vector_float2.hpp"
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#include "./ext/vector_float4.hpp"
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namespace glm
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{
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/// @addtogroup core_func_packing
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/// @{
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/// First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values.
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/// Then, the results are packed into the returned 32-bit unsigned integer.
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///
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/// The conversion for component c of v to fixed point is done as follows:
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/// packUnorm2x16: round(clamp(c, 0, +1) * 65535.0)
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///
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/// The first component of the vector will be written to the least significant bits of the output;
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/// the last component will be written to the most significant bits.
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///
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/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/packUnorm2x16.xml">GLSL packUnorm2x16 man page</a>
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/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions</a>
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GLM_FUNC_DECL uint packUnorm2x16(vec2 const& v);
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/// First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values.
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/// Then, the results are packed into the returned 32-bit unsigned integer.
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///
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/// The conversion for component c of v to fixed point is done as follows:
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/// packSnorm2x16: round(clamp(v, -1, +1) * 32767.0)
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///
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/// The first component of the vector will be written to the least significant bits of the output;
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/// the last component will be written to the most significant bits.
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///
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/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/packSnorm2x16.xml">GLSL packSnorm2x16 man page</a>
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/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions</a>
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GLM_FUNC_DECL uint packSnorm2x16(vec2 const& v);
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/// First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values.
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/// Then, the results are packed into the returned 32-bit unsigned integer.
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///
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/// The conversion for component c of v to fixed point is done as follows:
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/// packUnorm4x8: round(clamp(c, 0, +1) * 255.0)
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///
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/// The first component of the vector will be written to the least significant bits of the output;
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/// the last component will be written to the most significant bits.
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///
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/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/packUnorm4x8.xml">GLSL packUnorm4x8 man page</a>
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/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions</a>
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GLM_FUNC_DECL uint packUnorm4x8(vec4 const& v);
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/// First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values.
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/// Then, the results are packed into the returned 32-bit unsigned integer.
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///
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/// The conversion for component c of v to fixed point is done as follows:
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/// packSnorm4x8: round(clamp(c, -1, +1) * 127.0)
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///
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/// The first component of the vector will be written to the least significant bits of the output;
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/// the last component will be written to the most significant bits.
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///
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/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/packSnorm4x8.xml">GLSL packSnorm4x8 man page</a>
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/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions</a>
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GLM_FUNC_DECL uint packSnorm4x8(vec4 const& v);
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/// 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.
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/// Then, each component is converted to a normalized floating-point value to generate the returned two- or four-component vector.
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///
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/// The conversion for unpacked fixed-point value f to floating point is done as follows:
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/// unpackUnorm2x16: f / 65535.0
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///
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/// The first component of the returned vector will be extracted from the least significant bits of the input;
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/// the last component will be extracted from the most significant bits.
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///
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/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/unpackUnorm2x16.xml">GLSL unpackUnorm2x16 man page</a>
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/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions</a>
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GLM_FUNC_DECL vec2 unpackUnorm2x16(uint p);
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/// 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.
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/// Then, each component is converted to a normalized floating-point value to generate the returned two- or four-component vector.
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///
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/// The conversion for unpacked fixed-point value f to floating point is done as follows:
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/// unpackSnorm2x16: clamp(f / 32767.0, -1, +1)
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///
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/// The first component of the returned vector will be extracted from the least significant bits of the input;
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/// the last component will be extracted from the most significant bits.
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///
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/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/unpackSnorm2x16.xml">GLSL unpackSnorm2x16 man page</a>
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/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions</a>
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GLM_FUNC_DECL vec2 unpackSnorm2x16(uint p);
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/// 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.
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/// Then, each component is converted to a normalized floating-point value to generate the returned two- or four-component vector.
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///
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/// The conversion for unpacked fixed-point value f to floating point is done as follows:
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/// unpackUnorm4x8: f / 255.0
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///
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/// The first component of the returned vector will be extracted from the least significant bits of the input;
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/// the last component will be extracted from the most significant bits.
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///
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/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/unpackUnorm4x8.xml">GLSL unpackUnorm4x8 man page</a>
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/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions</a>
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GLM_FUNC_DECL vec4 unpackUnorm4x8(uint p);
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/// 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.
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/// Then, each component is converted to a normalized floating-point value to generate the returned two- or four-component vector.
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///
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/// The conversion for unpacked fixed-point value f to floating point is done as follows:
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/// unpackSnorm4x8: clamp(f / 127.0, -1, +1)
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///
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/// The first component of the returned vector will be extracted from the least significant bits of the input;
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/// the last component will be extracted from the most significant bits.
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///
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/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/unpackSnorm4x8.xml">GLSL unpackSnorm4x8 man page</a>
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/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions</a>
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GLM_FUNC_DECL vec4 unpackSnorm4x8(uint p);
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/// Returns a double-qualifier value obtained by packing the components of v into a 64-bit value.
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/// If an IEEE 754 Inf or NaN is created, it will not signal, and the resulting floating point value is unspecified.
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/// Otherwise, the bit- level representation of v is preserved.
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/// The first vector component specifies the 32 least significant bits;
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/// the second component specifies the 32 most significant bits.
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///
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/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/packDouble2x32.xml">GLSL packDouble2x32 man page</a>
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/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions</a>
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GLM_FUNC_DECL double packDouble2x32(uvec2 const& v);
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/// Returns a two-component unsigned integer vector representation of v.
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/// The bit-level representation of v is preserved.
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/// The first component of the vector contains the 32 least significant bits of the double;
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/// the second component consists the 32 most significant bits.
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///
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/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/unpackDouble2x32.xml">GLSL unpackDouble2x32 man page</a>
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/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions</a>
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GLM_FUNC_DECL uvec2 unpackDouble2x32(double v);
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/// Returns an unsigned integer obtained by converting the components of a two-component floating-point vector
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/// to the 16-bit floating-point representation found in the OpenGL Specification,
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/// and then packing these two 16- bit integers into a 32-bit unsigned integer.
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/// The first vector component specifies the 16 least-significant bits of the result;
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/// the second component specifies the 16 most-significant bits.
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///
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/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/packHalf2x16.xml">GLSL packHalf2x16 man page</a>
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/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions</a>
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GLM_FUNC_DECL uint packHalf2x16(vec2 const& v);
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/// Returns a two-component floating-point vector with components obtained by unpacking a 32-bit unsigned integer into a pair of 16-bit values,
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/// interpreting those values as 16-bit floating-point numbers according to the OpenGL Specification,
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/// and converting them to 32-bit floating-point values.
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/// The first component of the vector is obtained from the 16 least-significant bits of v;
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/// the second component is obtained from the 16 most-significant bits of v.
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///
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/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/unpackHalf2x16.xml">GLSL unpackHalf2x16 man page</a>
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/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions</a>
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GLM_FUNC_DECL vec2 unpackHalf2x16(uint v);
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/// @}
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}//namespace glm
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#include "detail/func_packing.inl"
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