1 /* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

     2  *

     3  * Permission is hereby granted, free of charge, to any person obtaining a

     4  * copy of this software and associated documentation files (the "Software"),

     5  * to deal in the Software without restriction, including without limitation

     6  * the rights to use, copy, modify, merge, publish, distribute, sublicense,

     7  * and/or sell copies of the Software, and to permit persons to whom the

     8  * Software is furnished to do so, subject to the following conditions:

     9  *

    10  * The above copyright notice and this permission notice shall be included

    11  * in all copies or substantial portions of the Software.

    12  *

    13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

    14  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

    15  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

    16  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

    17  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

    18  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

    19  *

    20  * Initial Contributors:

    21  * Nokia Corporation - initial contribution.

    22  *

    23  * Contributors:

    24  *

    25  * Description:

    26  *

    27  */

    28 

    29 #include "half.h"

    30 

    31 GLfloat dglConvertHalfToFloat(khronos_int16_t half)

    32 {

    33 	// INF and NaN are mapped to floating point values.

    34 

    35 	khronos_int32_t exponent = half & 0x7c00;

    36 	khronos_int16_t mantissa = half & 0x03ff;

    37 	if(!exponent)

    38 	{

    39 		if(mantissa)

    40 		{

    41 			// Subnormals are mapped to zero.

    42 			mantissa = 0;

    43 		}

    44 	}

    45 	else

    46 	{

    47 		// Convert bias.

    48 		exponent += 0x1c000;

    49 	}

    50 

    51 	{

    52 		khronos_int32_t conv = ((half & 0x8000) << 16) |

    53 							   (exponent << 13) |

    54 							   (mantissa << 13);

    55 		return *(GLfloat*)&conv;

    56 	}

    57 }