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system32 - allow individual x/y flipping on tilemaps, 2nd screen on arescue needs this

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This commit is contained in:
David Haywood 2015-06-10 21:12:35 +01:00
parent eefbf671bb
commit 3ca05f596d
1 changed files with 22 additions and 7 deletions
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29
src/mame/video/segas32.c
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@ -41,8 +41,9 @@
$31FF00 : w--- ---- ---- ---- : Screen width (0= 320, 1= 412)
---- f--- ---- ---- : Bitmap format (1= 8bpp, 0= 4bpp)
---- -t-- ---- ---- : Tile banking related
---- --f- ---- ---- : 1= All layers X+Y flip
---- ---- ---- 4--- : 1= X+Y flip for NBG3
---- --f- ---- ---- : 1= Global X/Y flip? (most games?)
---- ---f ---- ---- : 1= All layers Y flip (or one layer?) (Air Rescue 2nd screen)
---- ---- ---- 4--- : 1= X+Y flip for NBG3
---- ---- ---- -2-- : 1= X+Y flip for NBG2
---- ---- ---- --1- : 1= X+Y flip for NBG1
---- ---- ---- ---0 : 1= X+Y flip for NBG0
@ -866,7 +867,7 @@ void segas32_state::update_tilemap_zoom(screen_device &screen, struct segas32_st
UINT32 srcx, srcx_start, srcy;
UINT32 srcxstep, srcystep;
int dstxstep, dstystep;
int flip, opaque;
int opaque;
int x, y;
/* get the tilemaps */
@ -879,7 +880,15 @@ void segas32_state::update_tilemap_zoom(screen_device &screen, struct segas32_st
//if (screen.machine().input().code_pressed(KEYCODE_X) && bgnum == 1) opaque = 1;
/* determine if we're flipped */
flip = ((m_system32_videoram[0x1ff00/2] >> 9) ^ (m_system32_videoram[0x1ff00/2] >> bgnum)) & 1;
int global_flip = (m_system32_videoram[0x1ff00 / 2] >> 9)&1;
int flipx = global_flip;
int flipy = global_flip ^ ((m_system32_videoram[0x1ff00 / 2] >> 8)&1);
int layer_flip = (m_system32_videoram[0x1ff00 / 2] >> bgnum) & 1;
flipy ^= layer_flip;
flipx ^= layer_flip;
/* determine the clipping */
clipenable = (m_system32_videoram[0x1ff02/2] >> (11 + bgnum)) & 1;
@ -919,14 +928,20 @@ void segas32_state::update_tilemap_zoom(screen_device &screen, struct segas32_st
srcy += cliprect.min_y * srcystep;
/* if we're flipped, simply adjust the start/step parameters */
if (flip)
if (flipy)
{
const rectangle &visarea = screen.visible_area();
srcy += (visarea.max_y - 2 * cliprect.min_y) * srcystep;
srcystep = -srcystep;
}
if (flipx)
{
const rectangle &visarea = screen.visible_area();
srcx_start += (visarea.max_x - 2 * cliprect.min_x) * srcxstep;
srcy += (visarea.max_y - 2 * cliprect.min_y) * srcystep;
srcxstep = -srcxstep;
srcystep = -srcystep;
}
/* loop over the target rows */