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aleck64.cpp: improved Magical Tetris Challenge tetrominoes display (ghost pieces and colors) [Angelo Salese]

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angelosa 2018-04-05 23:50:08 +02:00
parent 7ec12d1a0a
commit a0c8fa4961
1 changed files with 49 additions and 17 deletions
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66
src/mame/drivers/aleck64.cpp
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@ -948,42 +948,74 @@ MACHINE_CONFIG_END
uint32_t aleck64_state::screen_update_e90(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
bitmap.fill(0, cliprect);
screen_update_n64(screen,bitmap,cliprect);
screen_update_n64(screen,bitmap,cliprect);
// TODO: extract from the real tables (maybe RLEd inside paletteram words 0xa - 0xf?)
static constexpr u8 pal_table[8*8] =
{
8, 6, 6, 6, 6, 5, 4, 3,
9, 7, 5, 6, 4, 1, 1, 4,
9, 8, 6, 5, 1, 1, 1, 5,
9, 8, 7, 5, 1, 1, 4, 6,
9, 8, 7, 6, 5, 5, 6, 6,
9, 8, 6, 7, 7, 6, 5, 6,
9, 8, 8, 8, 8, 8, 7, 6,
8, 9, 9, 9, 9, 9, 9, 8
};
for(int offs=0;offs<0x1000/4;offs+=2)
{
int xi,yi;
int r,g,b;
int pal_offs;
int pal_shift;
// 0x400 is another enable? end code if off?
//uint16_t tile = m_e90_vram[offs] >> 16;
uint16_t pal = m_e90_vram[offs] & 0xff; // guess: 0x1000 entries / word / 4bpp = 0x7f, divided by two below (TODO: why?)
// TODO: mask 0x300 on tile seems to be tile number
// (active piece drawn with 0x100, special square blocks drawn with cycling 0x1c0, 0x200 & 0x240)
uint16_t attr = m_e90_vram[offs] & 0xffff;
// bit 5 disables?
if(attr & 0x20)
continue;
// guess: 0x1000 entries / word / 4bpp = 0x7f, divided by two below
// bits 5 and 6 of palette bank seems to be highlight and shadow, separated from this bank
uint16_t pal = (attr & 0x06) >> 1;
int16_t x = m_e90_vram[offs+1] >> 16;
int16_t y = m_e90_vram[offs+1] & 0xffff;
pal>>=1;
x>>=1;
pal_offs = (pal*0x20);
pal_offs+= 1; // edit this to get the other colors in the range
pal_shift = pal_offs & 1 ? 0 : 16;
r = m_e90_pal[pal_offs>>1] >> pal_shift;
g = (m_e90_pal[pal_offs>>1] >> (5+pal_shift));
b = (m_e90_pal[pal_offs>>1] >> (10+pal_shift));
r&=0x1f;
g&=0x1f;
b&=0x1f;
r = (r << 3) | (r >> 2);
g = (g << 3) | (g >> 2);
b = (b << 3) | (b >> 2);
// ghost piece, probably enabled thru one bit of these (as weird as it sounds)
if((y & 0xff00) == 0xbc00)
pal |= (0x40 >> 1);
// color banks
// some pieces needs this color adjustment (see T piece / 5 block version of I piece)
pal |= (attr & 0xc0) >> 4;
for(yi=0;yi<8;yi++)
{
for(xi=0;xi<8;xi++)
{
int res_x,res_y;
uint16_t raw_rgb;
res_x = x+xi + 4;
res_y = y+yi + 7;
res_y = (y & 0xff)+yi + 7;
pal_offs = (pal*0x10);
pal_offs+= pal_table[xi+yi*8];
pal_shift = pal_offs & 1 ? 0 : 16;
raw_rgb = m_e90_pal[pal_offs>>1] >> pal_shift;
r = (raw_rgb & 0x001f) >> 0;
g = (raw_rgb & 0x03e0) >> 5;
b = (raw_rgb & 0x7c00) >> 10;
r = pal5bit(r);
g = pal5bit(g);
b = pal5bit(b);
if(cliprect.contains(res_x, res_y))
bitmap.pix32(res_y, res_x) = r << 16 | g << 8 | b;
}
}
}
return 0;
}