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469 lines
14 KiB
469 lines
14 KiB
/////////////////////////////////////////////////////////////////////////////////// |
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/// OpenGL Mathematics (glm.g-truc.net) |
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/// |
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/// Copyright (c) 2005 - 2014 G-Truc Creation (www.g-truc.net) |
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/// Permission is hereby granted, free of charge, to any person obtaining a copy |
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/// of this software and associated documentation files (the "Software"), to deal |
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/// in the Software without restriction, including without limitation the rights |
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/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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/// copies of the Software, and to permit persons to whom the Software is |
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/// furnished to do so, subject to the following conditions: |
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/// |
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/// The above copyright notice and this permission notice shall be included in |
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/// all copies or substantial portions of the Software. |
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/// |
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/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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/// THE SOFTWARE. |
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/// |
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/// @ref gtc_packing |
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/// @file glm/gtc/packing.inl |
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/// @date 2013-08-08 / 2013-08-08 |
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/// @author Christophe Riccio |
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/////////////////////////////////////////////////////////////////////////////////// |
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#include "../common.hpp" |
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#include "../vec2.hpp" |
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#include "../vec3.hpp" |
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#include "../vec4.hpp" |
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#include "../detail/type_half.hpp" |
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namespace glm{ |
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namespace detail |
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{ |
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GLM_FUNC_QUALIFIER glm::uint16 float2half(glm::uint32 f) |
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{ |
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// 10 bits => EE EEEFFFFF |
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// 11 bits => EEE EEFFFFFF |
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// Half bits => SEEEEEFF FFFFFFFF |
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// Float bits => SEEEEEEE EFFFFFFF FFFFFFFF FFFFFFFF |
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// 0x00007c00 => 00000000 00000000 01111100 00000000 |
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// 0x000003ff => 00000000 00000000 00000011 11111111 |
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// 0x38000000 => 00111000 00000000 00000000 00000000 |
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// 0x7f800000 => 01111111 10000000 00000000 00000000 |
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// 0x00008000 => 00000000 00000000 10000000 00000000 |
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return |
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((f >> 16) & 0x8000) | // sign |
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((((f & 0x7f800000) - 0x38000000) >> 13) & 0x7c00) | // exponential |
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((f >> 13) & 0x03ff); // Mantissa |
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} |
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GLM_FUNC_QUALIFIER glm::uint32 float2packed11(glm::uint32 f) |
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{ |
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// 10 bits => EE EEEFFFFF |
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// 11 bits => EEE EEFFFFFF |
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// Half bits => SEEEEEFF FFFFFFFF |
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// Float bits => SEEEEEEE EFFFFFFF FFFFFFFF FFFFFFFF |
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// 0x000007c0 => 00000000 00000000 00000111 11000000 |
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// 0x00007c00 => 00000000 00000000 01111100 00000000 |
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// 0x000003ff => 00000000 00000000 00000011 11111111 |
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// 0x38000000 => 00111000 00000000 00000000 00000000 |
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// 0x7f800000 => 01111111 10000000 00000000 00000000 |
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// 0x00008000 => 00000000 00000000 10000000 00000000 |
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return |
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((((f & 0x7f800000) - 0x38000000) >> 17) & 0x07c0) | // exponential |
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((f >> 17) & 0x003f); // Mantissa |
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} |
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GLM_FUNC_QUALIFIER glm::uint32 packed11ToFloat(glm::uint32 p) |
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{ |
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// 10 bits => EE EEEFFFFF |
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// 11 bits => EEE EEFFFFFF |
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// Half bits => SEEEEEFF FFFFFFFF |
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// Float bits => SEEEEEEE EFFFFFFF FFFFFFFF FFFFFFFF |
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// 0x000007c0 => 00000000 00000000 00000111 11000000 |
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// 0x00007c00 => 00000000 00000000 01111100 00000000 |
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// 0x000003ff => 00000000 00000000 00000011 11111111 |
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// 0x38000000 => 00111000 00000000 00000000 00000000 |
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// 0x7f800000 => 01111111 10000000 00000000 00000000 |
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// 0x00008000 => 00000000 00000000 10000000 00000000 |
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return |
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((((p & 0x07c0) << 17) + 0x38000000) & 0x7f800000) | // exponential |
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((p & 0x003f) << 17); // Mantissa |
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} |
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GLM_FUNC_QUALIFIER glm::uint32 float2packed10(glm::uint32 f) |
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{ |
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// 10 bits => EE EEEFFFFF |
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// 11 bits => EEE EEFFFFFF |
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// Half bits => SEEEEEFF FFFFFFFF |
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// Float bits => SEEEEEEE EFFFFFFF FFFFFFFF FFFFFFFF |
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// 0x0000001F => 00000000 00000000 00000000 00011111 |
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// 0x0000003F => 00000000 00000000 00000000 00111111 |
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// 0x000003E0 => 00000000 00000000 00000011 11100000 |
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// 0x000007C0 => 00000000 00000000 00000111 11000000 |
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// 0x00007C00 => 00000000 00000000 01111100 00000000 |
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// 0x000003FF => 00000000 00000000 00000011 11111111 |
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// 0x38000000 => 00111000 00000000 00000000 00000000 |
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// 0x7f800000 => 01111111 10000000 00000000 00000000 |
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// 0x00008000 => 00000000 00000000 10000000 00000000 |
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return |
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((((f & 0x7f800000) - 0x38000000) >> 18) & 0x03E0) | // exponential |
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((f >> 18) & 0x001f); // Mantissa |
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} |
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GLM_FUNC_QUALIFIER glm::uint32 packed10ToFloat(glm::uint32 p) |
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{ |
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// 10 bits => EE EEEFFFFF |
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// 11 bits => EEE EEFFFFFF |
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// Half bits => SEEEEEFF FFFFFFFF |
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// Float bits => SEEEEEEE EFFFFFFF FFFFFFFF FFFFFFFF |
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// 0x0000001F => 00000000 00000000 00000000 00011111 |
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// 0x0000003F => 00000000 00000000 00000000 00111111 |
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// 0x000003E0 => 00000000 00000000 00000011 11100000 |
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// 0x000007C0 => 00000000 00000000 00000111 11000000 |
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// 0x00007C00 => 00000000 00000000 01111100 00000000 |
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// 0x000003FF => 00000000 00000000 00000011 11111111 |
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// 0x38000000 => 00111000 00000000 00000000 00000000 |
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// 0x7f800000 => 01111111 10000000 00000000 00000000 |
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// 0x00008000 => 00000000 00000000 10000000 00000000 |
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return |
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((((p & 0x03E0) << 18) + 0x38000000) & 0x7f800000) | // exponential |
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((p & 0x001f) << 18); // Mantissa |
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} |
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GLM_FUNC_QUALIFIER glm::uint half2float(glm::uint h) |
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{ |
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return ((h & 0x8000) << 16) | ((( h & 0x7c00) + 0x1C000) << 13) | ((h & 0x03FF) << 13); |
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} |
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GLM_FUNC_QUALIFIER glm::uint floatTo11bit(float x) |
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{ |
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if(x == 0.0f) |
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return 0; |
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else if(glm::isnan(x)) |
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return ~0; |
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else if(glm::isinf(x)) |
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return 0x1f << 6; |
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float Copy = reinterpret_cast<uint&>(x); |
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return float2packed11(Pack); |
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} |
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GLM_FUNC_QUALIFIER float packed11bitToFloat(glm::uint x) |
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{ |
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if(x == 0) |
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return 0.0f; |
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else if(x == ((1 << 11) - 1)) |
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return ~0;//NaN |
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else if(x == (0x1f << 6)) |
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return ~0;//Inf |
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uint result = packed11ToFloat(x); |
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return reinterpret_cast<float&>(result); |
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} |
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GLM_FUNC_QUALIFIER glm::uint floatTo10bit(float x) |
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{ |
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if(x == 0.0f) |
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return 0; |
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else if(glm::isnan(x)) |
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return ~0; |
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else if(glm::isinf(x)) |
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return 0x1f << 5; |
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uint Pack = reinterpret_cast<uint&>(x); |
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return float2packed10(Pack); |
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} |
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GLM_FUNC_QUALIFIER float packed10bitToFloat(glm::uint x) |
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{ |
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if(x == 0) |
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return 0.0f; |
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else if(x == ((1 << 10) - 1)) |
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return ~0;//NaN |
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else if(x == (0x1f << 5)) |
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return ~0;//Inf |
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uint result = packed10ToFloat(x); |
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return reinterpret_cast<float&>(result); |
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} |
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// GLM_FUNC_QUALIFIER glm::uint f11_f11_f10(float x, float y, float z) |
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// { |
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// return ((floatTo11bit(x) & ((1 << 11) - 1)) << 0) | ((floatTo11bit(y) & ((1 << 11) - 1)) << 11) | ((floatTo10bit(z) & ((1 << 10) - 1)) << 22); |
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// } |
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union u10u10u10u2 |
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{ |
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struct |
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{ |
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uint x : 10; |
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uint y : 10; |
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uint z : 10; |
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uint w : 2; |
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} data; |
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uint32 pack; |
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}; |
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union i10i10i10i2 |
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{ |
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struct |
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{ |
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int x : 10; |
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int y : 10; |
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int z : 10; |
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int w : 2; |
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} data; |
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uint32 pack; |
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}; |
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}//namespace detail |
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GLM_FUNC_QUALIFIER uint8 packUnorm1x8(float v) |
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{ |
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return static_cast<uint8>(round(clamp(v, 0.0f, 1.0f) * 255.0f)); |
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} |
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GLM_FUNC_QUALIFIER float unpackUnorm1x8(uint8 p) |
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{ |
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float Unpack(static_cast<float>(p)); |
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return Unpack * static_cast<float>(0.0039215686274509803921568627451); // 1 / 255 |
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} |
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GLM_FUNC_QUALIFIER uint16 packUnorm2x8(vec2 const & v) |
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{ |
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u8vec2 Topack(round(clamp(v, 0.0f, 1.0f) * 255.0f)); |
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uint16* Packed = reinterpret_cast<uint16*>(&Topack); |
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return *Packed; |
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} |
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GLM_FUNC_QUALIFIER vec2 unpackUnorm2x8(uint16 p) |
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{ |
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u8vec2* Unpacked = reinterpret_cast<u8vec2*>(const_cast<uint16*>(&p)); |
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return vec2(*Unpacked) * float(0.0039215686274509803921568627451); // 1 / 255 |
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} |
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GLM_FUNC_QUALIFIER uint8 packSnorm1x8(float v) |
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{ |
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int8 Topack(static_cast<int8>(round(clamp(v ,-1.0f, 1.0f) * 127.0f))); |
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uint8* Packed = reinterpret_cast<uint8*>(&Topack); |
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return *Packed; |
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} |
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GLM_FUNC_QUALIFIER float unpackSnorm1x8(uint8 p) |
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{ |
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float Unpack(static_cast<float>(*const_cast<uint8*>(&p))); |
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return clamp( |
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Unpack * 0.00787401574803149606299212598425f, // 1.0f / 127.0f |
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-1.0f, 1.0f); |
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} |
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GLM_FUNC_QUALIFIER uint16 packSnorm2x8(vec2 const & v) |
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{ |
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i8vec2 Topack(round(clamp(v ,-1.0f, 1.0f) * 127.0f)); |
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uint16* Packed = reinterpret_cast<uint16*>(&Topack); |
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return *Packed; |
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} |
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GLM_FUNC_QUALIFIER vec2 unpackSnorm2x8(uint16 p) |
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{ |
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i8vec2* Unpack = reinterpret_cast<i8vec2*>(const_cast<uint16*>(&p)); |
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return clamp( |
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vec2(*Unpack) * 0.00787401574803149606299212598425f, // 1.0f / 127.0f |
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-1.0f, 1.0f); |
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} |
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GLM_FUNC_QUALIFIER uint16 packUnorm1x16(float s) |
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{ |
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return static_cast<uint16>(round(clamp(s, 0.0f, 1.0f) * 65535.0f)); |
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} |
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GLM_FUNC_QUALIFIER float unpackUnorm1x16(uint16 p) |
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{ |
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float Unpack = static_cast<float>(*const_cast<uint16*>(&p)); |
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return Unpack * 1.5259021896696421759365224689097e-5f; // 1.0 / 65535.0 |
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} |
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GLM_FUNC_QUALIFIER uint64 packUnorm4x16(vec4 const & v) |
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{ |
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u16vec4 Topack(round(clamp(v , 0.0f, 1.0f) * 65535.0f)); |
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uint64* Packed = reinterpret_cast<uint64*>(&Topack); |
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return *Packed; |
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} |
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GLM_FUNC_QUALIFIER vec4 unpackUnorm4x16(uint64 const & p) |
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{ |
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u16vec4* Unpack = reinterpret_cast<u16vec4*>(const_cast<uint64*>(&p)); |
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return vec4(*Unpack) * 1.5259021896696421759365224689097e-5f; // 1.0 / 65535.0 |
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} |
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GLM_FUNC_QUALIFIER uint16 packSnorm1x16(float v) |
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{ |
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int16 Topack = static_cast<int16>(round(clamp(v ,-1.0f, 1.0f) * 32767.0f)); |
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uint16* Packed = reinterpret_cast<uint16*>(&Topack); |
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return *Packed; |
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} |
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GLM_FUNC_QUALIFIER float unpackSnorm1x16(uint16 p) |
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{ |
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float Unpack = static_cast<float>(*const_cast<uint16*>(&p)); |
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return clamp( |
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Unpack * 3.0518509475997192297128208258309e-5f, //1.0f / 32767.0f, |
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-1.0f, 1.0f); |
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} |
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GLM_FUNC_QUALIFIER uint64 packSnorm4x16(vec4 const & v) |
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{ |
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i16vec4 Topack = static_cast<i16vec4>(round(clamp(v ,-1.0f, 1.0f) * 32767.0f)); |
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uint64* Packed = reinterpret_cast<uint64*>(&Topack); |
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return *Packed; |
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} |
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GLM_FUNC_QUALIFIER vec4 unpackSnorm4x16(uint64 p) |
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{ |
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i16vec4* Unpack(reinterpret_cast<i16vec4*>(const_cast<uint64*>(&p))); |
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return clamp( |
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vec4(*Unpack) * 3.0518509475997192297128208258309e-5f, //1.0f / 32767.0f, |
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-1.0f, 1.0f); |
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} |
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GLM_FUNC_QUALIFIER uint16 packHalf1x16(float v) |
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{ |
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int16 Topack = detail::toFloat16(v); |
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uint16* Packed = reinterpret_cast<uint16*>(&Topack); |
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return *Packed; |
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} |
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GLM_FUNC_QUALIFIER float unpackHalf1x16(uint16 v) |
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{ |
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int16* Unpack = reinterpret_cast<int16*>(const_cast<uint16*>(&v)); |
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return detail::toFloat32(*Unpack); |
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} |
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GLM_FUNC_QUALIFIER uint64 packHalf4x16(glm::vec4 const & v) |
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{ |
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i16vec4 Unpack( |
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detail::toFloat16(v.x), |
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detail::toFloat16(v.y), |
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detail::toFloat16(v.z), |
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detail::toFloat16(v.w)); |
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uint64* Packed = reinterpret_cast<uint64*>(&Unpack); |
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return *Packed; |
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} |
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GLM_FUNC_QUALIFIER glm::vec4 unpackHalf4x16(uint64 const & v) |
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{ |
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i16vec4* p = reinterpret_cast<i16vec4*>(const_cast<uint64*>(&v)); |
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i16vec4 Unpack(*p); |
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return vec4( |
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detail::toFloat32(Unpack.x), |
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detail::toFloat32(Unpack.y), |
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detail::toFloat32(Unpack.z), |
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detail::toFloat32(Unpack.w)); |
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} |
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GLM_FUNC_QUALIFIER uint32 packI3x10_1x2(ivec4 const & v) |
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{ |
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detail::i10i10i10i2 Result; |
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Result.data.x = v.x; |
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Result.data.y = v.y; |
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Result.data.z = v.z; |
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Result.data.w = v.w; |
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return Result.pack; |
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} |
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GLM_FUNC_QUALIFIER ivec4 unpackI3x10_1x2(uint32 v) |
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{ |
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detail::i10i10i10i2 Unpack; |
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Unpack.pack = v; |
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return ivec4( |
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Unpack.data.x, |
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Unpack.data.y, |
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Unpack.data.z, |
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Unpack.data.w); |
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} |
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GLM_FUNC_QUALIFIER uint32 packU3x10_1x2(uvec4 const & v) |
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{ |
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detail::u10u10u10u2 Result; |
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Result.data.x = v.x; |
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Result.data.y = v.y; |
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Result.data.z = v.z; |
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Result.data.w = v.w; |
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return Result.pack; |
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} |
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GLM_FUNC_QUALIFIER uvec4 unpackU3x10_1x2(uint32 v) |
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{ |
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detail::u10u10u10u2 Unpack; |
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Unpack.pack = v; |
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return uvec4( |
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Unpack.data.x, |
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Unpack.data.y, |
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Unpack.data.z, |
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Unpack.data.w); |
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} |
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GLM_FUNC_QUALIFIER uint32 packSnorm3x10_1x2(vec4 const & v) |
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{ |
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detail::i10i10i10i2 Result; |
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Result.data.x = int(round(clamp(v.x,-1.0f, 1.0f) * 511.f)); |
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Result.data.y = int(round(clamp(v.y,-1.0f, 1.0f) * 511.f)); |
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Result.data.z = int(round(clamp(v.z,-1.0f, 1.0f) * 511.f)); |
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Result.data.w = int(round(clamp(v.w,-1.0f, 1.0f) * 1.f)); |
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return Result.pack; |
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} |
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GLM_FUNC_QUALIFIER vec4 unpackSnorm3x10_1x2(uint32 v) |
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{ |
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detail::i10i10i10i2 Unpack; |
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Unpack.pack = v; |
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vec4 Result; |
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Result.x = clamp(float(Unpack.data.x) / 511.f, -1.0f, 1.0f); |
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Result.y = clamp(float(Unpack.data.y) / 511.f, -1.0f, 1.0f); |
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Result.z = clamp(float(Unpack.data.z) / 511.f, -1.0f, 1.0f); |
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Result.w = clamp(float(Unpack.data.w) / 1.f, -1.0f, 1.0f); |
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return Result; |
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} |
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GLM_FUNC_QUALIFIER uint32 packUnorm3x10_1x2(vec4 const & v) |
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{ |
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detail::i10i10i10i2 Result; |
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Result.data.x = int(round(clamp(v.x, 0.0f, 1.0f) * 1023.f)); |
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Result.data.y = int(round(clamp(v.y, 0.0f, 1.0f) * 1023.f)); |
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Result.data.z = int(round(clamp(v.z, 0.0f, 1.0f) * 1023.f)); |
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Result.data.w = int(round(clamp(v.w, 0.0f, 1.0f) * 3.f)); |
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return Result.pack; |
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} |
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GLM_FUNC_QUALIFIER vec4 unpackUnorm3x10_1x2(uint32 v) |
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{ |
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detail::i10i10i10i2 Unpack; |
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Unpack.pack = v; |
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vec4 Result; |
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Result.x = float(Unpack.data.x) / 1023.f; |
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Result.y = float(Unpack.data.y) / 1023.f; |
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Result.z = float(Unpack.data.z) / 1023.f; |
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Result.w = float(Unpack.data.w) / 3.f; |
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return Result; |
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} |
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GLM_FUNC_QUALIFIER uint32 packF2x11_1x10(vec3 const & v) |
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{ |
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return |
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((detail::floatTo11bit(v.x) & ((1 << 11) - 1)) << 0) | |
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((detail::floatTo11bit(v.y) & ((1 << 11) - 1)) << 11) | |
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((detail::floatTo10bit(v.z) & ((1 << 10) - 1)) << 22); |
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} |
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GLM_FUNC_QUALIFIER vec3 unpackF2x11_1x10(uint32 v) |
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{ |
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return vec3( |
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detail::packed11bitToFloat(v >> 0), |
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detail::packed11bitToFloat(v >> 11), |
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detail::packed10bitToFloat(v >> 22)); |
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} |
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}//namespace glm
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