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1 /* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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2 * |
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3 * Permission is hereby granted, free of charge, to any person obtaining a |
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4 * copy of this software and associated documentation files (the "Software"), |
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5 * to deal in the Software without restriction, including without limitation |
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6 * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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7 * and/or sell copies of the Software, and to permit persons to whom the |
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8 * Software is furnished to do so, subject to the following conditions: |
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9 * |
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10 * The above copyright notice and this permission notice shall be included |
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11 * in all copies or substantial portions of the Software. |
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12 * |
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13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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14 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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16 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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17 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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18 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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19 * |
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20 * Initial Contributors: |
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21 * Nokia Corporation - initial contribution. |
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22 * |
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23 * Contributors: |
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24 * |
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25 * Description: |
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26 * |
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27 */ |
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28 |
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29 #include "half.h" |
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30 |
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31 GLfloat dglConvertHalfToFloat(khronos_int16_t half) |
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32 { |
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33 // INF and NaN are mapped to floating point values. |
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34 |
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35 khronos_int32_t exponent = half & 0x7c00; |
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36 khronos_int16_t mantissa = half & 0x03ff; |
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37 if(!exponent) |
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38 { |
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39 if(mantissa) |
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40 { |
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41 // Subnormals are mapped to zero. |
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42 mantissa = 0; |
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43 } |
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44 } |
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45 else |
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46 { |
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47 // Convert bias. |
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48 exponent += 0x1c000; |
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49 } |
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50 |
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51 { |
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52 khronos_int32_t conv = ((half & 0x8000) << 16) | |
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53 (exponent << 13) | |
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54 (mantissa << 13); |
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55 return *(GLfloat*)&conv; |
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56 } |
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57 } |