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author angelosa <salese_corp_ltd@email.it>2017-08-29 10:00:06 +0200
committer angelosa <salese_corp_ltd@email.it>2017-08-29 10:01:37 +0200
commit3a9849a5b3006743bf1d3eaa974749a0248a1261 (patch)
tree4b1d24b54c434c760b9bc41380dc559e64c02ba8
parente1e3ba3bcefdbf724845cf021318d28032985326 (diff)
mb60553.cpp: improved zooming alignment, mostly noticeable in Tecmo World Cup '94 [Angelo Salese]
-rw-r--r--src/mame/video/mb60553.cpp26
1 files changed, 17 insertions, 9 deletions
diff --git a/src/mame/video/mb60553.cpp b/src/mame/video/mb60553.cpp
index 5bd10492d33..f9510d7c470 100644
--- a/src/mame/video/mb60553.cpp
+++ b/src/mame/video/mb60553.cpp
@@ -5,7 +5,12 @@
the actual line scroll / zoom is not properly understood
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"
@@ -257,7 +262,7 @@ void mb60553_zooming_tilemap_device::draw( screen_device &screen, bitmap_ind16&
{
int line;
rectangle clip;
-
+
clip.min_x = screen.visible_area().min_x;
clip.max_x = screen.visible_area().max_x;
@@ -267,20 +272,23 @@ 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];
+ 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 += (24<<4); // maybe not..
+ 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;
- incxx = m_lineram[(line)*8+0]<<4;
incyy = m_lineram[(line)*8+3]<<4;
-
+
clip.min_y = clip.max_y = line;
draw_roz_core(screen, bitmap, clip, startx<<12,starty<<12,