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More likely implementation for line zoom in psikyosh. No whatsnew.

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This commit is contained in:
Paul Priest 2010-01-16 16:36:56 +00:00
parent 5ba7e63961
commit e6c8cc813d
1 changed files with 3 additions and 3 deletions
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6
src/mame/video/psikyosh.c
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@ -414,10 +414,10 @@ static void draw_bglayerscroll( running_machine *machine, int layer, bitmap_t *b
/* very slow bit, needs optimising. apply scrollx and zoomx by assembling scanline from row */ /* very slow bit, needs optimising. apply scrollx and zoomx by assembling scanline from row */
profiler_mark_start(PROFILER_USER3); profiler_mark_start(PROFILER_USER3);
if(bg_zoom[scanline]) { if(bg_zoom[scanline]) {
int jj = 0x10000 << 6; // ensure +ve for mod int jj = 0x10000 << 8; // ensure +ve for mod
for(int ii = 0; ii < scr_width; ii++) { for(int ii = 0; ii < scr_width; ii++) {
scr_line[ii] = tilemap_line[(int)((jj>>6) - bg_scrollx[scanline]) % width]; scr_line[ii] = tilemap_line[(int)((jj>>8) - bg_scrollx[scanline]) % width];
jj += (1<<6) + bg_zoom[scanline]; /* This is a guess, will need to verify on my board. not 6.10 like the sprites */ jj += (1<<8) - bg_zoom[scanline]; /* This is a guess, will need to verify on my board. not 6.10 like the sprites */
} }
} }
else { else {