92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/**
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* @file patch_dct.h
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* @brief Function declarations for DCT and IDCT routines
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*
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* $LicenseInfo:firstyear=2000&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#ifndef LL_PATCH_DCT_H
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#define LL_PATCH_DCT_H
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class LLVector3;
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// Code Values
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const U8 ZERO_CODE = 0x0;
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const U8 ZERO_EOB = 0x2;
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const U8 POSITIVE_VALUE = 0x6;
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const U8 NEGATIVE_VALUE = 0x7;
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const S8 NORMAL_PATCH_SIZE = 16;
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const S8 LARGE_PATCH_SIZE = 32;
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const U8 END_OF_PATCHES = 97;
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#define _PATCH_SIZE_16_AND_32_ONLY
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// Top level header for group of headers
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//typedef struct LL_Group_Header
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//{
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// U16 stride; // 2 = 2
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// U8 patch_size; // 1 = 3
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// U8 layer_type; // 1 = 4
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//} LLGroupHeader;
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class LLGroupHeader
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{
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public:
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U16 stride; // 2 = 2
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U8 patch_size; // 1 = 3
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U8 layer_type; // 1 = 4
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};
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// Individual patch header
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//typedef struct LL_Patch_Header
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//{
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// F32 dc_offset; // 4 bytes
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// U16 range; // 2 = 7 ((S16) FP range (breaks if we need > 32K meters in 1 patch)
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// U8 quant_wbits; // 1 = 8 (upper 4 bits is quant - 2, lower 4 bits is word bits - 2)
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// U16 patchids; // 2 = 10 (actually only uses 10 bits, 5 for each)
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//} LLPatchHeader;
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class LLPatchHeader
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{
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public:
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F32 dc_offset; // 4 bytes
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U16 range; // 2 = 7 ((S16) FP range (breaks if we need > 32K meters in 1 patch)
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U8 quant_wbits; // 1 = 8 (upper 4 bits is quant - 2, lower 4 bits is word bits - 2)
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U16 patchids; // 2 = 10 (actually only uses 10 bits, 5 for each)
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};
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// Compression routines
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void init_patch_compressor(S32 patch_size, S32 patch_stride, S32 layer_type);
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void prescan_patch(F32 *patch, LLPatchHeader *php, F32 &zmax, F32 &zmin);
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void compress_patch(F32 *patch, S32 *cpatch, LLPatchHeader *php, S32 prequant);
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void get_patch_group_header(LLGroupHeader *gopp);
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// Decompression routines
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void set_group_of_patch_header(LLGroupHeader *gopp);
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void init_patch_decompressor(S32 size);
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void decompress_patch(F32 *patch, S32 *cpatch, LLPatchHeader *ph);
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void decompress_patchv(LLVector3 *v, S32 *cpatch, LLPatchHeader *ph);
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#endif
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