/**************************************************************************
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*
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* Copyright 2008 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/**
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* @file
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* Functions to produce packed colors/Z from floats.
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*/
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#ifndef U_PACK_COLOR_H
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#define U_PACK_COLOR_H
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#include "pipe/p_compiler.h"
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#include "pipe/p_format.h"
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#include "util/u_debug.h"
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#include "util/u_format.h"
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#include "util/u_math.h"
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/**
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* Helper union for packing pixel values.
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* Will often contain values in formats which are too complex to be described
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* in simple terms, hence might just effectively contain a number of bytes.
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* Must be big enough to hold data for all formats (currently 256 bits).
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*/
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union util_color {
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ubyte ub;
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ushort us;
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uint ui[4];
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ushort h[4]; /* half float */
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float f[4];
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double d[4];
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};
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/**
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* Pack 4 ubytes into a 4-byte word
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*/
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static inline unsigned
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pack_ub4(ubyte b0, ubyte b1, ubyte b2, ubyte b3)
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{
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return ((((unsigned int)b0) << 0) |
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(((unsigned int)b1) << 8) |
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(((unsigned int)b2) << 16) |
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(((unsigned int)b3) << 24));
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}
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/**
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* Pack/convert 4 floats into one 4-byte word.
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*/
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static inline unsigned
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pack_ui32_float4(float a, float b, float c, float d)
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{
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return pack_ub4( float_to_ubyte(a),
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float_to_ubyte(b),
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float_to_ubyte(c),
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float_to_ubyte(d) );
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}
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#endif /* U_PACK_COLOR_H */
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