mirror of https://github.com/weiju/amiga-stuff
908 lines
21 KiB
C
908 lines
21 KiB
C
#include <exec/exec.h>
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#include <dos/dos.h>
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#include <intuition/intuition.h>
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#include <graphics/gfx.h>
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#include <hardware/custom.h>
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#include <hardware/dmabits.h>
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#include <clib/exec_protos.h>
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#include <clib/dos_protos.h>
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#include <clib/graphics_protos.h>
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#include <clib/intuition_protos.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "hardware.h"
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#include "cop_all.h"
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#include "global_defs.h"
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#include "common.h"
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#define EXTRAWIDTH 64
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#define EXTRAHEIGHT 32
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#define BITMAPWIDTH (SCREENWIDTH + EXTRAWIDTH)
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#define BITMAPBYTESPERROW (BITMAPWIDTH / 8)
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#define BITMAPHEIGHT (SCREENHEIGHT + EXTRAHEIGHT)
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#define BLOCKSWIDTH 320
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#define BLOCKSHEIGHT 200
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#define BLOCKSBYTESPERROW (BLOCKSWIDTH / 8)
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#define BLOCKSPERROW (BLOCKSWIDTH / BLOCKWIDTH)
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#define NUMSTEPS_X BLOCKWIDTH
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#define NUMSTEPS_Y BLOCKHEIGHT
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#define BITMAPBLOCKSPERROW (BITMAPWIDTH / BLOCKWIDTH)
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#define BITMAPBLOCKSPERCOL (BITMAPHEIGHT / BLOCKHEIGHT)
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#define VISIBLEBLOCKSX (SCREENWIDTH / BLOCKWIDTH)
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#define VISIBLEBLOCKSY (SCREENHEIGHT / BLOCKHEIGHT)
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#define BITMAPPLANELINES (BITMAPHEIGHT * BLOCKSDEPTH)
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#define BLOCKPLANELINES (BLOCKHEIGHT * BLOCKSDEPTH)
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#define PLANEPIXELBITMAPWIDTH (BITMAPWIDTH * BLOCKSDEPTH)
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#define BLOCKSFILESIZE (BLOCKSWIDTH * BLOCKSHEIGHT * BLOCKSPLANES / 8 + PALSIZE)
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#define DIRECTION_IGNORE 0
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#define DIRECTION_LEFT 1
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#define DIRECTION_RIGHT 2
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#define UP 1
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#define DOWN 2
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// calculate how many times (steps) y-scrolling needs to
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// blit two blocks instead of one block to make sure a
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// complete row is blitted after 16 pixels of y-scrolling
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//
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// x * 2 + (16 - x) = BITMAPBLOCKSPERROW
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// 2x + 16 - x = BITMAPBLOCKSPERROW
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// x = BITMAPBLOCKSPERROW - 16
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#define TWOBLOCKS (BITMAPBLOCKSPERROW - NUMSTEPS_Y)
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#define TWOBLOCKSTEP TWOBLOCKS
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struct Screen *scr;
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struct RastPort *ScreenRastPort;
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struct BitMap *BlocksBitmap,*ScreenBitmap;
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UBYTE *frontbuffer,*blocksbuffer;
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WORD mapposx,mapposy,videoposx,videoposy,block_videoposy;
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WORD mapblockx,mapblocky,stepx,stepy;
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WORD bitmapheight,bitplanemodulo;
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WORD *savewordpointer;
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WORD saveword;
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BYTE previous_xdirection;
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struct PrgOptions options;
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struct LevelMap level_map;
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UWORD colors[BLOCKSCOLORS];
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char s[256];
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#if EXTRAWIDTH == 32
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// bitmap width aligned to 32 Pixels
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#define MAX_FETCHMODE 2
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#define MAX_FETCHMODE_S "2"
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#elif EXTRAWIDTH == 64
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// bitmap width aligned to 64 Pixels
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#define MAX_FETCHMODE 3
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#define MAX_FETCHMODE_S "3"
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#else
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// bad extrawidth
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#error "EXTRAWIDTH must be either 32 or 64"
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#endif
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struct FetchInfo fetchinfo [] =
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{
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{0x30,0xD0,2,0,16}, /* normal */
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{0x28,0xC8,4,16,32}, /* BPL32 */
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{0x28,0xC8,4,16,32}, /* BPAGEM */
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{0x18,0xB8,8,48,64} /* BPL32 + BPAGEM */
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};
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/************* SETUP/CLEANUP ROUTINES ***************/
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static void Cleanup (char *msg)
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{
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WORD rc;
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if (msg) {
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printf("Error: %s\n",msg);
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rc = RETURN_WARN;
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} else {
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rc = RETURN_OK;
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}
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if (scr) CloseScreen(scr);
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if (ScreenBitmap) {
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WaitBlit();
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FreeBitMap(ScreenBitmap);
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}
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if (BlocksBitmap) {
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WaitBlit();
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FreeBitMap(BlocksBitmap);
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}
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if (level_map.raw_map) FreeVec(level_map.raw_map);
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exit(rc);
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}
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static void OpenDisplay(void)
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{
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struct DimensionInfo diminfo;
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DisplayInfoHandle dih;
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ULONG modeid;
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LONG l;
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bitmapheight = BITMAPHEIGHT + 3;
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if (!(ScreenBitmap = AllocBitMap(BITMAPWIDTH, bitmapheight, BLOCKSDEPTH,
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BMF_STANDARD | BMF_INTERLEAVED | BMF_CLEAR,0))) {
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Cleanup("Can't alloc screen bitmap!");
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}
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frontbuffer = ScreenBitmap->Planes[0];
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frontbuffer += (fetchinfo[options.fetchmode].bitmapoffset / 8);
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if (!(TypeOfMem(ScreenBitmap->Planes[0]) & MEMF_CHIP)) {
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Cleanup("Screen bitmap is not in CHIP RAM!?? If you have a gfx card try disabling \"planes to fast\" or similiar options in your RTG system!");
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}
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l = GetBitMapAttr(ScreenBitmap,BMA_FLAGS);
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if (!(GetBitMapAttr(ScreenBitmap,BMA_FLAGS) & BMF_INTERLEAVED)) {
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Cleanup("Screen bitmap is not in interleaved format!??");
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}
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modeid = get_mode_id(options.how, options.ntsc);
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if (!(scr = OpenScreenTags(0,SA_Width,BITMAPWIDTH,
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SA_Height,bitmapheight,
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SA_Depth,BLOCKSDEPTH,
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SA_DisplayID,modeid,
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SA_BitMap,ScreenBitmap,
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options.how ? SA_Overscan : TAG_IGNORE,OSCAN_TEXT,
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options.how ? SA_AutoScroll : TAG_IGNORE,TRUE,
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SA_Quiet,TRUE,
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TAG_DONE))) {
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Cleanup("Can't open screen!");
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}
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if (scr->RastPort.BitMap->Planes[0] != ScreenBitmap->Planes[0]) {
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Cleanup("Screen was not created with the custom bitmap I supplied!??");
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}
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ScreenRastPort = &scr->RastPort;
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LoadRGB4(&scr->ViewPort,colors,BLOCKSCOLORS);
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}
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static void InitCopperlist(void)
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{
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WORD *wp;
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ULONG plane,plane2;
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LONG l;
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wait_vbl();
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custom->dmacon = 0x7FFF;
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custom->beamcon0 = options.ntsc ? 0 : DISPLAYPAL;
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CopFETCHMODE[1] = options.fetchmode;
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// bitplane control registers
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CopBPLCON0[1] = ((BLOCKSDEPTH * BPL0_BPU0_F) & BPL0_BPUMASK) +
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((BLOCKSDEPTH / 8) * BPL0_BPU3_F) +
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BPL0_COLOR_F +
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(options.speed ? 0 : BPL0_USEBPLCON3_F);
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CopBPLCON1[1] = 0;
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CopBPLCON3[1] = BPLCON3_BRDNBLNK;
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// bitplane modulos
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l = BITMAPBYTESPERROW * BLOCKSDEPTH -
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SCREENBYTESPERROW - fetchinfo[options.fetchmode].modulooffset;
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CopBPLMODA[1] = l;
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CopBPLMODB[1] = l;
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CopVIDEOSPLITRESETMODULO[1] = l;
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CopVIDEOSPLITRESETMODULO[3] = l;
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bitplanemodulo = l;
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// display window start/stop
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CopDIWSTART[1] = DIWSTART;
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CopDIWSTOP[1] = DIWSTOP;
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// display data fetch start/stop
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CopDDFSTART[1] = fetchinfo[options.fetchmode].ddfstart;
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CopDDFSTOP[1] = fetchinfo[options.fetchmode].ddfstop;
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// plane pointers
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wp = CopPLANE1H;
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for(l = 0;l < BLOCKSDEPTH;l++)
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{
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plane = (ULONG)ScreenBitmap->Planes[l];
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wp[1] = plane >> 16;
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wp[3] = plane & 0xFFFF;
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wp += 4;
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}
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// setup modulo trick
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plane = (ULONG)ScreenBitmap->Planes[0];
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plane2 = plane +
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(BITMAPHEIGHT - 1) * BITMAPBYTESPERROW * BLOCKSDEPTH +
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SCREENBYTESPERROW +
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fetchinfo[options.fetchmode].modulooffset;
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l = (plane - plane2) & 0xFFFF;
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CopVIDEOSPLITMODULO[1] = l;
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CopVIDEOSPLITMODULO[3] = l;
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CopVIDEOSPLITMODULO[1] = l;
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CopVIDEOSPLITMODULO[3] = l;
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custom->intena = 0x7FFF;
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custom->dmacon = DMAF_SETCLR | DMAF_BLITTER | DMAF_COPPER | DMAF_RASTER | DMAF_MASTER;
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custom->cop2lc = (ULONG)CopperList;
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}
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/******************* SCROLLING **********************/
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static void DrawBlock(LONG x,LONG y,LONG mapx,LONG mapy)
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{
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UBYTE block;
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// x = in pixels
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// y = in "planelines" (1 realline = BLOCKSDEPTH planelines)
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x = (x / 8) & 0xFFFE;
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block = level_map.data[mapy * level_map.width + mapx];
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mapx = (block % BLOCKSPERROW) * (BLOCKWIDTH / 8);
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mapy = (block / BLOCKSPERROW) * (BLOCKPLANELINES * BLOCKSBYTESPERROW);
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if (options.how) OwnBlitter();
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if (y + BLOCKPLANELINES <= BITMAPPLANELINES) {
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// blit does not cross bitmap's bottom boundary
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hard_wait_blit();
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custom->bltcon0 = 0x9F0; // use A and D. Op: D = A
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custom->bltcon1 = 0;
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custom->bltafwm = 0xFFFF;
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custom->bltalwm = 0xFFFF;
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custom->bltamod = BLOCKSBYTESPERROW - (BLOCKWIDTH / 8);
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custom->bltdmod = BITMAPBYTESPERROW - (BLOCKWIDTH / 8);
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custom->bltapt = blocksbuffer + mapy + mapx;
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custom->bltdpt = frontbuffer + y * BITMAPBYTESPERROW + x;
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custom->bltsize = BLOCKPLANELINES * 64 + (BLOCKWIDTH / 16);
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} else {
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// blit does cross bitmap's bottom boundary
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// --> need to split blit = do two blit operations
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hard_wait_blit();
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custom->bltcon0 = 0x9F0; // use A and D. Op: D = A
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custom->bltcon1 = 0;
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custom->bltafwm = 0xFFFF;
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custom->bltalwm = 0xFFFF;
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custom->bltamod = BLOCKSBYTESPERROW - (BLOCKWIDTH / 8);
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custom->bltdmod = BITMAPBYTESPERROW - (BLOCKWIDTH / 8);
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custom->bltapt = blocksbuffer + mapy + mapx;
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custom->bltdpt = frontbuffer + y * BITMAPBYTESPERROW + x;
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y = BITMAPPLANELINES - y;
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custom->bltsize = y * 64 + (BLOCKWIDTH / 16);
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hard_wait_blit();
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custom->bltdpt = frontbuffer + x;
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custom->bltsize = (BLOCKPLANELINES - y) * 64 + (BLOCKWIDTH / 16);
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}
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if (options.how) DisownBlitter();
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}
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static void FillScreen(void)
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{
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WORD a,b,x,y;
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for (b = 0;b < BITMAPBLOCKSPERCOL;b++)
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{
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for (a = 0;a < BITMAPBLOCKSPERROW;a++)
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{
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x = a * BLOCKWIDTH;
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y = b * BLOCKPLANELINES;
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DrawBlock(x,y,a,b);
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}
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}
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}
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static void BlitExtraLine(WORD dest)
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{
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UBYTE *a,*b;
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a = frontbuffer;
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b = frontbuffer + BITMAPPLANELINES * BITMAPBYTESPERROW;
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hard_wait_blit();
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custom->bltcon0 = 0x9F0;
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custom->bltcon1 = 0;
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custom->bltafwm = 0xFFFF;
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custom->bltalwm = 0xFFFF;
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custom->bltamod = 0;
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custom->bltdmod = 0;
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custom->bltapt = (dest == UP) ? b : a;
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custom->bltdpt = (dest == UP) ? a : b;
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custom->bltsize = 1 * BLOCKSDEPTH * 64 + (BITMAPBYTESPERROW / 2);
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}
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static void ScrollUp(void)
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{
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WORD mapx,mapy,x,y;
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if (mapposy < 1) return;
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mapposy--;
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mapblocky = mapposy / BLOCKHEIGHT;
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stepy = mapposy & (NUMSTEPS_Y - 1);
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videoposy--;
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if (videoposy < 0) videoposy += BITMAPHEIGHT;
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if (stepy == (NUMSTEPS_Y - 1)) {
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block_videoposy -= BLOCKHEIGHT;
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if (block_videoposy < 0) block_videoposy += BITMAPHEIGHT;
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}
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if (stepy == (NUMSTEPS_Y - 1)) {
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// a complete row is filled up
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// : the next fill up row will be BLOCKHEIGHT (16)
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// pixels at the top, so we have to adjust
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// the fillup column (for x scrolling), but
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// only if the fillup column (x) contains some
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// fill up blocks
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if (stepx) {
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// step 1: blit the 1st block in the fillup
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// col (x). There can only be 0 or
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// [2 or more] fill up blocks in the
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// actual implementation, so we do
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// not need to check previous_xdirection
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// for this blit
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mapx = mapblockx + BITMAPBLOCKSPERROW;
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mapy = mapblocky + 1;
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x = ROUND2BLOCKWIDTH(videoposx);
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y = (block_videoposy + BLOCKHEIGHT) % BITMAPHEIGHT;
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y *= BLOCKSDEPTH;
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DrawBlock(x + BITMAPWIDTH,y,mapx,mapy);
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// step 2: remove the (former) bottommost fill up
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// block
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if (previous_xdirection == DIRECTION_RIGHT) {
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*savewordpointer = saveword;
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}
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mapy = stepx + 2;
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// we blit a 'left' block
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y = (block_videoposy + (mapy * BLOCKHEIGHT)) % BITMAPHEIGHT;
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y *= BLOCKSDEPTH;
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savewordpointer = (WORD *)(frontbuffer + (y * BITMAPBYTESPERROW) + (x / 8));
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saveword = *savewordpointer;
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mapx -= BITMAPBLOCKSPERROW;
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mapy += mapblocky;
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DrawBlock(x,y,mapx,mapy);
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previous_xdirection = DIRECTION_LEFT;
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} /* if (stepx) */
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} /* if (stepy == NUMSTEPS_Y - 1) */
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mapx = stepy;
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mapy = mapblocky;
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y = block_videoposy * BLOCKSDEPTH;
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if (mapx >= TWOBLOCKSTEP) {
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// blit only one block
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mapx += TWOBLOCKSTEP;
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x = mapx * BLOCKWIDTH + ROUND2BLOCKWIDTH(videoposx);
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mapx += mapblockx;
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DrawBlock(x,y,mapx,mapy);
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} else {
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// blit two blocks
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mapx *= 2;
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x = mapx * BLOCKWIDTH + ROUND2BLOCKWIDTH(videoposx);
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mapx += mapblockx;
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DrawBlock(x,y,mapx,mapy);
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x += BLOCKWIDTH;
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DrawBlock(x,y,mapx + 1,mapy);
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}
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}
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static void ScrollDown(void)
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{
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WORD mapx,mapy,x,y,y2;
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if (mapposy >= (level_map.height * BLOCKHEIGHT - SCREENHEIGHT - BLOCKHEIGHT)) return;
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mapx = stepy;
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mapy = mapblocky + BITMAPBLOCKSPERCOL;
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y = block_videoposy * BLOCKSDEPTH;
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if (mapx >= TWOBLOCKSTEP) {
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// blit only one block
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mapx += TWOBLOCKSTEP;
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x = mapx * BLOCKWIDTH + ROUND2BLOCKWIDTH(videoposx);
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mapx += mapblockx;
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DrawBlock(x,y,mapx,mapy);
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} else {
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// blit two blocks
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mapx *= 2;
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x = mapx * BLOCKWIDTH + ROUND2BLOCKWIDTH(videoposx);
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mapx += mapblockx;
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DrawBlock(x,y,mapx,mapy);
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x += BLOCKWIDTH;
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DrawBlock(x,y,mapx + 1,mapy);
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}
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mapposy++;
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mapblocky = mapposy / BLOCKHEIGHT;
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stepy = mapposy & (NUMSTEPS_Y - 1);
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videoposy++;
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if (videoposy >= BITMAPHEIGHT) videoposy -= BITMAPHEIGHT;
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if (!stepy) {
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block_videoposy += BLOCKHEIGHT;
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if (block_videoposy >= BITMAPHEIGHT) block_videoposy -= BITMAPHEIGHT;
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}
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if (stepy == 0) {
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// a complete row is filled up
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// : the next fill up row will be BLOCKHEIGHT (16)
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// pixels at the bottom, so we have to adjust
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// the fillup column (for x scrolling), but
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// only if the fillup column (x) contains some
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// fill up blocks
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if (stepx) {
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// step 1: blit the 1st block in the fillup
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// row (y) because this block must
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// not be part of the fillup col (x)
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// instead it is for exclusive use
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// by the fillup row
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mapx = mapblockx;
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mapy = mapblocky;
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x = ROUND2BLOCKWIDTH(videoposx);
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y = block_videoposy * BLOCKSDEPTH;
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DrawBlock(x,y,mapx,mapy);
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// step 2: blit the (new) bottommost fill up
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// block
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if (previous_xdirection == DIRECTION_LEFT) {
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*savewordpointer = saveword;
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}
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mapy = stepx + 1;
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// we blit a 'right-block'
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x += BITMAPWIDTH;
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y = (block_videoposy + (mapy * BLOCKHEIGHT)) % BITMAPHEIGHT;
|
|
y *= BLOCKSDEPTH;
|
|
|
|
y2 = (y + BLOCKPLANELINES - 1) % BITMAPPLANELINES;
|
|
|
|
savewordpointer = (WORD *)(frontbuffer + (y2 * BITMAPBYTESPERROW) + (x / 8));
|
|
saveword = *savewordpointer;
|
|
|
|
mapx += BITMAPBLOCKSPERROW;
|
|
mapy += mapblocky;
|
|
|
|
DrawBlock(x,y,mapx,mapy);
|
|
previous_xdirection = DIRECTION_RIGHT;
|
|
} /* if (stepx) */
|
|
} /* if (stepy == 0) */
|
|
}
|
|
|
|
static void ScrollLeft(void)
|
|
{
|
|
WORD mapx,mapy,x,y;
|
|
|
|
if (mapposx < 1) return;
|
|
|
|
mapposx--;
|
|
mapblockx = mapposx / BLOCKWIDTH;
|
|
stepx = mapposx & (NUMSTEPS_X - 1);
|
|
|
|
videoposx--;
|
|
if (videoposx < 0) {
|
|
BlitExtraLine(DOWN);
|
|
|
|
videoposx = PLANEPIXELBITMAPWIDTH - 1;
|
|
|
|
videoposy--;
|
|
if (videoposy < 0) videoposy = BITMAPHEIGHT - 1;
|
|
|
|
block_videoposy--;
|
|
if (block_videoposy < 0) block_videoposy = BITMAPHEIGHT - 1;
|
|
}
|
|
|
|
if (stepx == (NUMSTEPS_X - 1)) {
|
|
// a complete column is filled up
|
|
// : the next fill up column will be BLOCKWIDTH (16)
|
|
// pixels at the left, so we have to adjust
|
|
// the fillup row (for y scrolling)
|
|
|
|
// step 1: blit the block which came in at
|
|
// the left side and which might or
|
|
// might not be a fill up block
|
|
mapx = mapblockx;
|
|
mapy = mapblocky;
|
|
|
|
if (stepy) {
|
|
// there is a fill up block
|
|
// so block which comes in left is
|
|
// a fillup block
|
|
mapy += BITMAPBLOCKSPERCOL;
|
|
}
|
|
|
|
x = ROUND2BLOCKWIDTH(videoposx);
|
|
y = block_videoposy * BLOCKSDEPTH;
|
|
DrawBlock(x,y,mapx,mapy);
|
|
|
|
// step 2: remove the (former) rightmost fillup-block
|
|
mapx = stepy;
|
|
if (mapx) {
|
|
// there is a fill up block;
|
|
if (mapx >= TWOBLOCKSTEP) {
|
|
mapx += TWOBLOCKSTEP;
|
|
} else {
|
|
mapx *= 2;
|
|
}
|
|
x = ROUND2BLOCKWIDTH(videoposx) + (mapx * BLOCKWIDTH);
|
|
y = block_videoposy * BLOCKSDEPTH;
|
|
mapx += mapblockx;
|
|
mapy -= BITMAPBLOCKSPERCOL;
|
|
DrawBlock(x,y,mapx,mapy);
|
|
}
|
|
}
|
|
|
|
mapx = mapblockx;
|
|
mapy = stepx + 1;
|
|
|
|
x = ROUND2BLOCKWIDTH(videoposx);
|
|
|
|
if (previous_xdirection == DIRECTION_RIGHT) {
|
|
hard_wait_blit();
|
|
*savewordpointer = saveword;
|
|
}
|
|
|
|
if (mapy == 1) {
|
|
// blit two blocks
|
|
mapy += mapblocky;
|
|
y = (block_videoposy + (1 * BLOCKHEIGHT)) % BITMAPHEIGHT;
|
|
y *= BLOCKSDEPTH;
|
|
|
|
savewordpointer = (WORD *)(frontbuffer + (y * BITMAPBYTESPERROW) + (x / 8));
|
|
saveword = *savewordpointer;
|
|
|
|
DrawBlock(x,y,mapx,mapy);
|
|
|
|
y = (y + BLOCKPLANELINES) % BITMAPPLANELINES;
|
|
|
|
DrawBlock(x,y,mapx,mapy + 1);
|
|
|
|
} else {
|
|
// blit one block
|
|
mapy ++;
|
|
|
|
y = (block_videoposy + (mapy * BLOCKHEIGHT)) % BITMAPHEIGHT;
|
|
y *= BLOCKSDEPTH;
|
|
|
|
mapy += mapblocky;
|
|
|
|
savewordpointer = (WORD *)(frontbuffer + (y * BITMAPBYTESPERROW) + (x / 8));
|
|
saveword = *savewordpointer;
|
|
|
|
DrawBlock(x,y,mapx,mapy);
|
|
}
|
|
|
|
if (stepx) {
|
|
previous_xdirection = DIRECTION_LEFT;
|
|
} else {
|
|
previous_xdirection = DIRECTION_IGNORE;
|
|
}
|
|
}
|
|
|
|
static void ScrollRight(void)
|
|
{
|
|
WORD mapx,mapy,x,y,y2;
|
|
|
|
if (mapposx >= (level_map.width * BLOCKWIDTH - SCREENWIDTH - BLOCKWIDTH)) return;
|
|
|
|
mapx = mapblockx + BITMAPBLOCKSPERROW;
|
|
mapy = stepx + 1;
|
|
|
|
x = ROUND2BLOCKWIDTH(videoposx);
|
|
|
|
if (previous_xdirection == DIRECTION_LEFT) {
|
|
hard_wait_blit();
|
|
*savewordpointer = saveword;
|
|
}
|
|
|
|
if (mapy == 1) {
|
|
// blit two blocks
|
|
mapy += mapblocky;
|
|
|
|
y = (block_videoposy + (1 * BLOCKHEIGHT)) % BITMAPHEIGHT;
|
|
y *= BLOCKSDEPTH;
|
|
|
|
DrawBlock(x + BITMAPWIDTH,y,mapx,mapy);
|
|
y = (y + BLOCKPLANELINES) % BITMAPPLANELINES;
|
|
y2 = (y + BLOCKPLANELINES - 1) % BITMAPPLANELINES;
|
|
savewordpointer = (WORD *)(frontbuffer + (y2 * BITMAPBYTESPERROW) + ((x + BITMAPWIDTH) / 8));
|
|
saveword = *savewordpointer;
|
|
|
|
DrawBlock(x + BITMAPWIDTH,y,mapx,mapy + 1);
|
|
|
|
} else {
|
|
// blit one block
|
|
mapy ++;
|
|
y = (block_videoposy + (mapy * BLOCKHEIGHT)) % BITMAPHEIGHT;
|
|
y *= BLOCKSDEPTH;
|
|
y2 = (y + BLOCKPLANELINES - 1) % BITMAPPLANELINES;
|
|
mapy += mapblocky;
|
|
|
|
savewordpointer = (WORD *)(frontbuffer + (y2 * BITMAPBYTESPERROW) + ((x + BITMAPWIDTH) / 8));
|
|
saveword = *savewordpointer;
|
|
|
|
DrawBlock(x + BITMAPWIDTH,y,mapx,mapy);
|
|
}
|
|
mapposx++;
|
|
mapblockx = mapposx / BLOCKWIDTH;
|
|
stepx = mapposx & (NUMSTEPS_X - 1);
|
|
|
|
videoposx++;
|
|
|
|
if (videoposx == PLANEPIXELBITMAPWIDTH) {
|
|
BlitExtraLine(UP);
|
|
|
|
videoposx = 0;
|
|
videoposy++;
|
|
if (videoposy == BITMAPHEIGHT) videoposy = 0;
|
|
|
|
block_videoposy++;
|
|
if (block_videoposy == BITMAPHEIGHT) block_videoposy = 0;
|
|
}
|
|
|
|
if (stepx == 0) {
|
|
// a complete column is filled up
|
|
// : the next fill up column will be BLOCKWIDTH (16)
|
|
// pixels at the right, so we have to adjust
|
|
// the fillup row (for y scrolling)
|
|
|
|
// step 1: blit the block which came in at
|
|
// the right side and which is never
|
|
// a fill up block
|
|
|
|
mapx = mapblockx + BITMAPBLOCKSPERROW - 1;
|
|
mapy = mapblocky;
|
|
|
|
x = ROUND2BLOCKWIDTH(videoposx) + (BITMAPBLOCKSPERROW - 1) * BLOCKWIDTH;
|
|
y = block_videoposy * BLOCKSDEPTH;
|
|
|
|
DrawBlock(x,y,mapx,mapy);
|
|
|
|
// step 2: blit the (new) rightmost fillup-block
|
|
mapx = stepy;
|
|
if (mapx) {
|
|
// there is a fill up block;
|
|
if (mapx >= TWOBLOCKSTEP) {
|
|
mapx += (TWOBLOCKSTEP - 1);
|
|
} else {
|
|
mapx = mapx * 2 - 1;
|
|
}
|
|
x = ROUND2BLOCKWIDTH(videoposx) + (mapx * BLOCKWIDTH);
|
|
y = block_videoposy * BLOCKSDEPTH;
|
|
mapx += mapblockx;
|
|
DrawBlock(x,y,mapx,mapy + BITMAPBLOCKSPERCOL);
|
|
}
|
|
}
|
|
|
|
if (stepx) {
|
|
previous_xdirection = DIRECTION_RIGHT;
|
|
} else {
|
|
previous_xdirection = DIRECTION_IGNORE;
|
|
}
|
|
}
|
|
|
|
static void CheckJoyScroll(void)
|
|
{
|
|
WORD i,count;
|
|
|
|
if (joy_fire()) count = 4; else count = 1;
|
|
|
|
if (joy_up()) {
|
|
for (i = 0; i < count; i++) {
|
|
ScrollUp();
|
|
}
|
|
}
|
|
|
|
if (joy_down()) {
|
|
for (i = 0; i < count; i++) {
|
|
ScrollDown();
|
|
}
|
|
}
|
|
|
|
if (joy_left()) {
|
|
for (i = 0; i < count; i++) {
|
|
ScrollLeft();
|
|
}
|
|
}
|
|
|
|
if (joy_right()) {
|
|
for (i = 0; i < count; i++) {
|
|
ScrollRight();
|
|
}
|
|
}
|
|
}
|
|
|
|
static void UpdateCopperlist(void)
|
|
{
|
|
ULONG pl;
|
|
LONG planeadd,planeaddx;
|
|
WORD i,xpos,scroll,yoffset;
|
|
WORD *wp;
|
|
|
|
i = fetchinfo[options.fetchmode].scrollpixels;
|
|
|
|
xpos = videoposx + i - 1;
|
|
|
|
planeaddx = (xpos / i) * (i / 8);
|
|
i = (i - 1) - (xpos & (i - 1));
|
|
|
|
scroll = (i & 15) * 0x11;
|
|
if (i & 16) scroll |= (0x400 + 0x4000);
|
|
if (i & 32) scroll |= (0x800 + 0x8000);
|
|
|
|
// set scroll register in BPLCON1
|
|
CopBPLCON1[1] = scroll;
|
|
|
|
// set top plane pointers
|
|
yoffset = (videoposy + BLOCKHEIGHT) % BITMAPHEIGHT;
|
|
planeadd = ((LONG)yoffset) * BLOCKSDEPTH * BITMAPBYTESPERROW;
|
|
|
|
wp = CopPLANE1H;
|
|
|
|
for (i = 0; i < BLOCKSDEPTH; i++) {
|
|
pl = ((ULONG)ScreenBitmap->Planes[i]) + planeadd + planeaddx;
|
|
|
|
wp[1] = (WORD)(pl >> 16);
|
|
wp[3] = (WORD)(pl & 0xFFFF);
|
|
|
|
wp += 4;
|
|
}
|
|
|
|
// set video split wait
|
|
|
|
yoffset = BITMAPHEIGHT - yoffset;
|
|
yoffset += (DIWSTART >> 8);
|
|
|
|
/* CopVIDEOSPLIT must wait for line (yoffset -1 )
|
|
CopVIDEOSPLIT2 must wait for line (yoffset) */
|
|
|
|
if (yoffset <= 255) {
|
|
CopVIDEOSPLIT[0] = 0x0001;
|
|
CopVIDEOSPLIT[2] = (yoffset - 1) * 256 + 0x1;
|
|
|
|
CopVIDEOSPLIT2[0] = 0x0001;
|
|
CopVIDEOSPLIT2[2] = yoffset * 256 + 0x1;
|
|
} else if (yoffset == 256) {
|
|
CopVIDEOSPLIT[0] = 0x0001;
|
|
CopVIDEOSPLIT[2] = 255 * 256 + 0x1;
|
|
|
|
CopVIDEOSPLIT2[0] = 0xFFDF;
|
|
CopVIDEOSPLIT2[2] = (256 - 256) * 256 + 0x1;
|
|
} else {
|
|
CopVIDEOSPLIT[0] = 0xFFDF;
|
|
CopVIDEOSPLIT[2] = (yoffset - 256 - 1) * 256 + 0x1;
|
|
|
|
CopVIDEOSPLIT2[0] = 0x001;
|
|
CopVIDEOSPLIT2[2] = (yoffset - 256) * 256 + 0x1;
|
|
}
|
|
|
|
/* Set video split plane pointers (to top of bitmap):
|
|
|
|
We only set the hiwords. The lowords are automatically
|
|
correct thanks to the modulo-trick in the copperlist
|
|
which is setup in UpdateCopperlist().
|
|
*/
|
|
pl = (ULONG)ScreenBitmap->Planes[0] + planeaddx;
|
|
|
|
wp = CopPLANE2_1H;
|
|
|
|
for (i = 0; i < BLOCKSDEPTH; i++) {
|
|
wp[1] = (WORD) (pl >> 16);
|
|
pl += BITMAPBYTESPERROW * BLOCKSDEPTH;
|
|
wp += 2;
|
|
}
|
|
}
|
|
|
|
static void MainLoop(void)
|
|
{
|
|
if (!options.how) {
|
|
// activate copperlist
|
|
hard_wait_blit();
|
|
wait_vbl();
|
|
|
|
custom->copjmp2 = 0;
|
|
}
|
|
|
|
while (!lmb_down()) {
|
|
if (!options.how) {
|
|
wait_vbeam(1);
|
|
UpdateCopperlist();
|
|
wait_vbeam(200);
|
|
} else {
|
|
Delay(1);
|
|
}
|
|
|
|
if (options.speed) *(WORD *)0xdff180 = 0xFF0;
|
|
CheckJoyScroll();
|
|
if (options.speed) *(WORD *)0xdff180 = 0xF00;
|
|
}
|
|
}
|
|
|
|
/********************* MAIN *************************/
|
|
|
|
int main(int argc, char *argv)
|
|
{
|
|
BOOL res = get_arguments(&options, s);
|
|
if (!res) Cleanup(s);
|
|
res = read_level_map(SCROLLER_MAP_PATH, &level_map, s);
|
|
if (!res) Cleanup(s);
|
|
|
|
BlocksBitmap = read_blocks(DEMO_BLOCKS_PATH, colors, s, BLOCKSWIDTH, BLOCKSHEIGHT);
|
|
if (!BlocksBitmap) Cleanup(s);
|
|
blocksbuffer = BlocksBitmap->Planes[0];
|
|
|
|
OpenDisplay();
|
|
|
|
if (!options.how) {
|
|
Delay(2*50);
|
|
kill_system();
|
|
InitCopperlist();
|
|
}
|
|
FillScreen();
|
|
MainLoop();
|
|
if (!options.how) {
|
|
activate_system();
|
|
}
|
|
Cleanup(0);
|
|
return 0;
|
|
}
|