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mb60553.cpp: improved zooming alignment, mostly noticeable in Tecmo World Cup '94 [Angelo Salese]

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This commit is contained in:
angelosa 2017-08-29 10:00:06 +02:00
parent e1e3ba3bce
commit 3a9849a5b3
1 changed files with 20 additions and 12 deletions
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24
src/mame/video/mb60553.cpp
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@ -7,6 +7,11 @@
interestingly the chip seems to require doubled up ROMs (2 copies of each ROM) to draw just the single layer.
*/
/*
Tecmo World Cup '94 "service mode" has an item for testing zooming, this is:
0xffdf12 target zoom code
0xffdf16 current zoom code
*/
#include "emu.h"
#include "mb60553.h"
@ -267,18 +272,21 @@ void mb60553_zooming_tilemap_device::draw( screen_device &screen, bitmap_ind16&
// int scrolly;
uint32_t startx,starty;
uint32_t incxx,incyy;
float xoffset;
// x origin is offset by 384
startx = m_regs[0] + 384;
starty = m_regs[1];
// startx += (24<<4); // maybe not..
// startx -= m_lineram[(line)*8+7]/2;
incxx = m_lineram[(line)*8+0]<<4;
// startx has an offset based off current x zoom value
// This is confirmed by Tecmo World Cup '94 startx being 0xff40 (-192) when showing footballer pics on attract mode (incxx is 0x800)
xoffset = (float)incxx/(float)0x10000 * 384.0;
startx = m_regs[0] + (uint32_t)xoffset;
starty = m_regs[1];
// TODO: what's this? Used by Grand Striker playfield
// startx -= m_lineram[(line)*8+7]/2;
incyy = m_lineram[(line)*8+3]<<4;
clip.min_y = clip.max_y = line;