98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
/**
|
|
* @file patch_dct.h
|
|
* @brief Function declarations for DCT and IDCT routines
|
|
*
|
|
* $LicenseInfo:firstyear=2000&license=viewergpl$
|
|
*
|
|
* Copyright (c) 2000-2009, 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://secondlifegrid.net/programs/open_source/licensing/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://secondlifegrid.net/programs/open_source/licensing/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
|