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/**
* @file patch_dct.h
* @brief Function declarations for DCT and IDCT routines
*
* $LicenseInfo:firstyear=2000&license=viewergpl$
*
* Copyright (c) 2000-2007, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlife.com/developers/opensource/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlife.com/developers/opensource/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_PATCH_DCT_H
#define LL_PATCH_DCT_H
class LLVector3;
// Code Values
const U8 ZERO_CODE = 0x0;
const U8 ZERO_EOB = 0x2;
const U8 POSITIVE_VALUE = 0x6;
const U8 NEGATIVE_VALUE = 0x7;
const S8 NORMAL_PATCH_SIZE = 16;
const S8 LARGE_PATCH_SIZE = 32;
const U8 END_OF_PATCHES = 97;
#define _PATCH_SIZE_16_AND_32_ONLY
// Top level header for group of headers
//typedef struct LL_Group_Header
//{
// U16 stride; // 2 = 2
// U8 patch_size; // 1 = 3
// U8 layer_type; // 1 = 4
//} LLGroupHeader;
class LLGroupHeader
{
public:
U16 stride; // 2 = 2
U8 patch_size; // 1 = 3
U8 layer_type; // 1 = 4
};
// Individual patch header
//typedef struct LL_Patch_Header
//{
// F32 dc_offset; // 4 bytes
// U16 range; // 2 = 7 ((S16) FP range (breaks if we need > 32K meters in 1 patch)
// U8 quant_wbits; // 1 = 8 (upper 4 bits is quant - 2, lower 4 bits is word bits - 2)
// U16 patchids; // 2 = 10 (actually only uses 10 bits, 5 for each)
//} LLPatchHeader;
class LLPatchHeader
{
public:
F32 dc_offset; // 4 bytes
U16 range; // 2 = 7 ((S16) FP range (breaks if we need > 32K meters in 1 patch)
U8 quant_wbits; // 1 = 8 (upper 4 bits is quant - 2, lower 4 bits is word bits - 2)
U16 patchids; // 2 = 10 (actually only uses 10 bits, 5 for each)
};
// Compression routines
void init_patch_compressor(S32 patch_size, S32 patch_stride, S32 layer_type);
void prescan_patch(F32 *patch, LLPatchHeader *php, F32 &zmax, F32 &zmin);
void compress_patch(F32 *patch, S32 *cpatch, LLPatchHeader *php, S32 prequant);
void get_patch_group_header(LLGroupHeader *gopp);
// Decompression routines
void set_group_of_patch_header(LLGroupHeader *gopp);
void init_patch_decompressor(S32 size);
void decompress_patch(F32 *patch, S32 *cpatch, LLPatchHeader *ph);
void decompress_patchv(LLVector3 *v, S32 *cpatch, LLPatchHeader *ph);
#endif
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