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349 lines
12 KiB
C
349 lines
12 KiB
C
//-------------------------------------------------------------------------
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/*
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Copyright (C) 1996, 2003 - 3D Realms Entertainment
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This file is part of Duke Nukem 3D version 1.5 - Atomic Edition
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Duke Nukem 3D is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program 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.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; 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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Original Source: 1996 - Todd Replogle
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Prepared for public release: 03/21/2003 - Charlie Wiederhold, 3D Realms
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Modifications for JonoF's port by Jonathon Fowler (jf@jonof.id.au)
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*/
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//-------------------------------------------------------------------------
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#include "compat.h"
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#include "animlib.h"
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//****************************************************************************
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//
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// LOCALS
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//
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//****************************************************************************
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# pragma pack(push,1)
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/* structure declarations for deluxe animate large page files, doesn't
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need to be in the header because there are no exposed functions
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that use any of this directly */
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typedef struct lpfileheaderstruct
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{
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uint32_t id; /* 4 uint8_tacter ID == "LPF " */
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uint16_t maxLps; /* max # largePages allowed. 256 FOR NOW. */
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uint16_t nLps; /* # largePages in this file. */
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uint32_t nRecords; /* # records in this file. 65534 is current limit + ring */
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uint16_t maxRecsPerLp; /* # records permitted in an lp. 256 FOR NOW. */
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uint16_t lpfTableOffset; /* Absolute Seek position of lpfTable. 1280 FOR NOW. */
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uint32_t contentType; /* 4 character ID == "ANIM" */
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uint16_t width; /* Width of screen in pixels. */
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uint16_t height; /* Height of screen in pixels. */
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uint8_t variant; /* 0==ANIM. */
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uint8_t version; /* 0==frame rate in 18/sec, 1= 70/sec */
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uint8_t hasLastDelta; /* 1==Last record is a delta from last-to-first frame. */
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uint8_t lastDeltaValid; /* 0==Ignore ring frame. */
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uint8_t pixelType; /* 0==256 color. */
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uint8_t CompressionType; /* 1==(RunSkipDump) Only one used FOR NOW. */
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uint8_t otherRecsPerFrm; /* 0 FOR NOW. */
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uint8_t bitmaptype; /* 1==320x200, 256-color. Only one implemented so far. */
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uint8_t recordTypes[32]; /* Not yet implemented. */
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uint32_t nFrames; /* Number of actual frames in the file, includes ring frame. */
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uint16_t framesPerSecond; /* Number of frames to play per second. */
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uint16_t pad2[29]; /* 58 bytes of filler to round up to 128 bytes total. */
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}
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lpfileheader; /* (comments from original source) */
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// this is the format of a large page structure
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typedef struct
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{
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uint16_t baseRecord; // Number of first record in this large page.
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uint16_t nRecords; // Number of records in lp.
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// bit 15 of "nRecords" == "has continuation from previous lp".
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// bit 14 of "nRecords" == "final record continues on next lp".
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uint16_t nBytes; // Total number of bytes of contents, excluding header.
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} lp_descriptor;
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#pragma pack(pop)
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#define IMAGEBUFFERSIZE 0x10000
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typedef struct
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{
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uint16_t framecount; // current frame of anim
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lpfileheader * lpheader; // file header will be loaded into this structure
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lp_descriptor * LpArray; // arrays of large page structs used to find frames
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uint16_t curlpnum; // initialize to an invalid Large page number
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lp_descriptor * curlp; // header of large page currently in memory
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uint16_t * thepage; // buffer where current large page is loaded
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uint8_t imagebuffer[IMAGEBUFFERSIZE]; // buffer where anim frame is decoded
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const uint8_t * buffer;
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uint8_t pal[768];
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int32_t currentframe;
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} anim_t;
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static anim_t * anim = NULL;
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//****************************************************************************
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//
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// findpage ()
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// - return the large page number a given frame resides in
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//
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//****************************************************************************
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static inline uint16_t findpage(uint16_t framenumber)
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{
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// curlpnum is initialized to 0xffff, obviously
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uint16_t i = (uint16_t)(anim->curlpnum & ~0xffff);
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int32_t j = 0;
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if (framenumber < anim->currentframe)
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i = 0, j++;
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// this scans the last used page and higher first and then scans the
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// previously accessed pages afterwards if it doesn't find anything
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do
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{
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for (; i<anim->lpheader->nLps; i++)
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if (anim->LpArray[i].baseRecord <= framenumber &&
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anim->LpArray[i].baseRecord + anim->LpArray[i].nRecords > framenumber)
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return i;
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if (!j && i == anim->lpheader->nLps)
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{
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// handle out of order pages... I don't think any Duke .ANM files
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// have them, but they're part of the file spec
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i = 0, j++;
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continue;
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}
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}
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while (0);
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return i;
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}
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//****************************************************************************
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//
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// loadpage ()
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// - seek out and set pointers to the large page specified
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//
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//****************************************************************************
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static inline void loadpage(uint16_t pagenumber, uint16_t **pagepointer)
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{
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if (anim->curlpnum == pagenumber)
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return;
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anim->curlp = &anim->LpArray[(anim->curlpnum = pagenumber)];
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*pagepointer = (uint16_t *)(anim->buffer + 0xb00 + (pagenumber*IMAGEBUFFERSIZE) +
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sizeof(lp_descriptor) + sizeof(uint16_t));
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}
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//****************************************************************************
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//
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// decodeframe ()
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// - I found this less obfuscated version of the .ANM "decompressor",
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// (c) 1998 "Jari Komppa aka Sol/Trauma". This code is public domain
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// but has been mostly rewritten by me.
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//
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// - As a side note, it looks like this format came about in 1989 and
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// never went anywhere after that, and appears to have been the format
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// used by Electronic Arts' DeluxePaint Animation, which never made it
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// past version 1.0.
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//
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//****************************************************************************
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static void decodeframe(uint8_t * srcP, uint8_t * dstP)
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{
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do
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{
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int32_t count=*srcP++;
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if (!count) /* Short RLE */
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{
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int32_t color = *(srcP+1);
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count = *(uint8_t *)((srcP += sizeof(int16_t)) - sizeof(int16_t));
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Bmemset((dstP += count) - count, color, count);
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continue;
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}
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else if ((count & 0x80) == 0) /* Short copy */
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{
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Bmemcpy((dstP += count) - count, (srcP += count) - count, count);
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continue;
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}
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else if ((count &= ~0x80) > 0) /* short skip */
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{
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dstP += count;
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continue;
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}
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/* long op */
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count = B_LITTLE16(B_UNBUF16(srcP));
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srcP += sizeof(int16_t);
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if (!count) /* stop sign */
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return;
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else if ((count & 0x8000) == 0) /* long skip */
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{
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dstP += count;
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continue;
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}
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else if ((count &= ~0x8000) & 0x4000) /* long RLE */
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{
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int32_t color = *srcP++;
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count &= ~0x4000;
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Bmemset((dstP += count) - count, color, count);
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continue;
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}
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/* long copy */
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Bmemcpy((dstP += count) - count, (srcP += count) - count, count);
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}
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while (1);
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}
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//****************************************************************************
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//
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// renderframe ()
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// - draw the frame sepcified from the large page in the buffer pointed to
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//
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//****************************************************************************
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static void renderframe(uint16_t framenumber, uint16_t *pagepointer)
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{
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uint8_t *ppointer;
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uint16_t offset = 0;
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uint16_t frame = framenumber - anim->curlp->baseRecord;
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while (frame--) offset += B_LITTLE16(pagepointer[frame]);
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ppointer = (uint8_t *)(pagepointer) + anim->curlp->nRecords*2 + offset + 4;
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if ((ppointer-4)[1])
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ppointer += B_LITTLE16(((uint16_t *)(ppointer-4))[1]) + (B_LITTLE16(((uint16_t *)(ppointer-4))[1]) & 1);
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decodeframe((uint8_t *)ppointer, (uint8_t *)anim->imagebuffer);
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}
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//****************************************************************************
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//
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// drawframe ()
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// - high level frame draw routine
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//
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//****************************************************************************
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static inline void drawframe(uint16_t framenumber)
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{
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loadpage(findpage(framenumber), &anim->thepage);
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renderframe(framenumber, anim->thepage);
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}
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// <length> is the file size, for consistency checking.
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int32_t ANIM_LoadAnim(const uint8_t *buffer, int32_t length)
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{
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int32_t i;
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length -= sizeof(lpfileheader)+128+768;
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if (length < 0)
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return -1;
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anim = (anim_t *)Xrealloc(anim, sizeof(anim_t));
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anim->curlpnum = 0xffff;
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anim->currentframe = -1;
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// this just modifies the data in-place instead of copying it elsewhere now
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anim->lpheader = (lpfileheader *)(anim->buffer = (uint8_t *)buffer);
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anim->lpheader->id = B_LITTLE32(anim->lpheader->id);
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anim->lpheader->maxLps = B_LITTLE16(anim->lpheader->maxLps);
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anim->lpheader->nLps = B_LITTLE16(anim->lpheader->nLps);
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anim->lpheader->nRecords = B_LITTLE32(anim->lpheader->nRecords);
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anim->lpheader->maxRecsPerLp = B_LITTLE16(anim->lpheader->maxRecsPerLp);
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anim->lpheader->lpfTableOffset = B_LITTLE16(anim->lpheader->lpfTableOffset);
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anim->lpheader->contentType = B_LITTLE32(anim->lpheader->contentType);
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anim->lpheader->width = B_LITTLE16(anim->lpheader->width);
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anim->lpheader->height = B_LITTLE16(anim->lpheader->height);
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anim->lpheader->nFrames = B_LITTLE32(anim->lpheader->nFrames);
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anim->lpheader->framesPerSecond = B_LITTLE16(anim->lpheader->framesPerSecond);
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length -= anim->lpheader->nLps * sizeof(lp_descriptor);
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if (length < 0)
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return -2;
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buffer += sizeof(lpfileheader)+128;
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// load the color palette
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for (i = 0; i < 768; i += 3)
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{
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anim->pal[i+2] = *buffer++;
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anim->pal[i+1] = *buffer++;
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anim->pal[i] = *buffer++;
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buffer++;
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}
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// set up large page descriptors
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anim->LpArray = (lp_descriptor *)buffer;
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// theoretically we should be able to play files with more than 256 frames now
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// assuming the utilities to create them can make them that way
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for (i = 0; i < anim->lpheader->nLps; i++)
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{
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anim->LpArray[i].baseRecord = B_LITTLE16(anim->LpArray[i].baseRecord);
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anim->LpArray[i].nRecords = B_LITTLE16(anim->LpArray[i].nRecords);
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anim->LpArray[i].nBytes = B_LITTLE16(anim->LpArray[i].nBytes);
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}
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return 0;
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}
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void ANIM_FreeAnim(void)
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{
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Bfree(anim);
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anim = NULL;
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}
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int32_t ANIM_NumFrames(void)
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{
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return anim->lpheader->nRecords;
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}
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uint8_t * ANIM_DrawFrame(int32_t framenumber)
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{
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int32_t cnt = anim->currentframe;
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// handle first play and looping or rewinding
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if (cnt < 0 || cnt > framenumber)
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cnt = 0;
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do drawframe(cnt++);
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while (cnt < framenumber);
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anim->currentframe = framenumber;
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return anim->imagebuffer;
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}
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uint8_t * ANIM_GetPalette(void)
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{
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return anim->pal;
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}
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