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popobear - change how we handle transpen

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This commit is contained in:
David Haywood 2013-03-13 22:47:31 +00:00
parent ee1c2e5fed
commit acdd062d5d
1 changed files with 29 additions and 9 deletions
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38
src/mame/drivers/popobear.c
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@ -6,11 +6,12 @@
TODO:
- auto-animation speed is erratic (way too fast);
- tilemap effects (scrolling, colscroll, linescroll);
(high score table?)
- BGM seems quite off, YM2413 core bug?
- IRQ generation;
- all possible related to some timers?
- I/Os;
- IRQ generation;
- Port 0x620000 is quite a mystery, some silly protection?
============================================================================================
@ -267,7 +268,7 @@ void popobear_state::draw_sprites(bitmap_ind16 &bitmap,const rectangle &cliprect
int width = 8 << ((param & 0x30)>>4);
int height = width; // sprites are always square?
int color_bank = ((param & 0xc)<<4);
int color_bank = ((param & 0xc)>>2);
int x_dir = param & 0x40;
int y_dir = param & 0x80;
@ -290,8 +291,18 @@ void popobear_state::draw_sprites(bitmap_ind16 &bitmap,const rectangle &cliprect
UINT8 pix = (vram[spr_num^1] & 0xff);
int x_draw = (x_dir) ? x+((width-1) - xi) : x+xi;
if(cliprect.contains(x_draw, y_draw) && pix)
bitmap.pix16(y_draw, x_draw) = machine().pens[pix+0x100+color_bank];
if(cliprect.contains(x_draw, y_draw))
{
// this is a bit strange, pix data is basically 8-bit
// but we have to treat 0x00, 0x20, 0x40, 0x60, 0x80, 0xa0, 0xc0 and 0xe0 as transpens?
// see scores when you colect an item
// granularity also means colour bank is applied *0x40
// and we have 2 more possible colour bank bits
if (pix&0x1f)
{
bitmap.pix16(y_draw, x_draw) = machine().pens[((pix+(color_bank*0x40))&0xff)+0x100];
}
}
spr_num++;
}
@ -314,7 +325,15 @@ UINT32 popobear_state::screen_update_popobear(screen_device &screen, bitmap_ind1
//popmessage("%04x",m_vregs[0/2]);
UINT16* vreg = m_vregs;
popmessage("%04x %04x %04x %04x %04x %04x %04x - %04x - %04x %04x",vreg[0x00],vreg[0x01],vreg[0x02],vreg[0x03],vreg[0x04],vreg[0x05],vreg[0x06], vreg[0x0b],vreg[0x0e],vreg[0x0f]);
// popmessage("%04x %04x %04x %04x %04x %04x %04x - %04x - %04x %04x",vreg[0x00],vreg[0x01],vreg[0x02],vreg[0x03],vreg[0x04],vreg[0x05],vreg[0x06], vreg[0x0b],vreg[0x0e],vreg[0x0f]);
// vreg[0x00] also looks like it could be some enable registers
// 0x82ff - BMC logo
// 0x8aff - some attract scenes (no sprites)
// 0x8bff - game attract scense etc. (sprites)
// vreg[0x01] is always
// 0xfefb
@ -327,8 +346,8 @@ UINT32 popobear_state::screen_update_popobear(screen_device &screen, bitmap_ind1
if ((enable0 != 0x00) && (enable0 != 0x0d) && (enable0 != 0x1f)) printf("unknown enable0 value %02x\n", enable0);
if ((enable1 != 0x00) && (enable1 != 0x0d) && (enable1 != 0x1f)) printf("unknown enable1 value %02x\n", enable1);
if ((enable2 != 0x00) && (enable2 != 0x0d) && (enable2 != 0x1f)) printf("unknown enable2 value %02x\n", enable2);
if ((enable3 != 0x00) && (enable3 != 0x0d) && (enable3 != 0x1f)) printf("unknown enable3 value %02x\n", enable3);
if ((enable2 != 0x00) && (enable2 != 0x0d)) printf("unknown enable2 value %02x\n", enable2);
if ((enable3 != 0x00) && (enable3 != 0x0d)) printf("unknown enable3 value %02x\n", enable3);
// the lower 2 tilemaps use regular scrolling
@ -574,6 +593,7 @@ TIMER_DEVICE_CALLBACK_MEMBER(popobear_state::popobear_irq)
m_maincpu->set_input_line(5, ASSERT_LINE);
/* TODO: actually a timer irq, tied with YM2413 sound chip (controls BGM tempo) */
/* the YM2413 doesn't have interrupts? */
if(scanline == 64 || scanline == 192)
m_maincpu->set_input_line(2, ASSERT_LINE);
}