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commodore/c65.cpp: working sprite-background priorities

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This commit is contained in:
angelosa 2024-08-08 10:22:52 +02:00
parent 74300293ff
commit 3c000d5387
1 changed files with 21 additions and 10 deletions
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31
src/mame/commodore/c65.cpp
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@ -381,13 +381,14 @@ private:
u8 m_sprite_exp_x, m_sprite_exp_y;
u8 m_sprite_multicolor_enable;
u8 m_sprite_multicolor_clut[2];
u8 m_sprite_priority;
bool m_blink_enable = false;
bitmap_ind16 m_bitmap;
emu_timer *m_scanline_timer;
TIMER_CALLBACK_MEMBER(scanline_cb);
std::tuple<u8, bool> get_tile_pixel(int y, int x);
std::tuple<u8, u8, bool> get_sprite_pixel(int y, int x);
std::tuple<u8, u8, u8, bool> get_sprite_pixel(int y, int x);
void PalEntryFlush(uint8_t offset);
void IRQCheck(uint8_t irq_cause);
@ -523,7 +524,15 @@ void c65_state::vic4567_map(address_map &map)
IRQCheck(0);
})
);
// map(0x1b, 0x1b) Sprite-Background priority
// 53275/$d01b Sprite-Background priority
map(0x1b, 0x1b).lrw8(
NAME([this] (offs_t offset) {
return m_sprite_priority;
}),
NAME([this] (offs_t offset, u8 data) {
m_sprite_priority = data;
})
);
// 53276/$d01c Sprite multicolor enable
map(0x1c, 0x1c).lrw8(
NAME([this] (offs_t offset) {
@ -684,13 +693,14 @@ std::tuple<u8, bool> c65_state::get_tile_pixel(int y, int x)
return std::make_tuple(highlight_color + ((enable_dot) ? foreground_color : background_color), enable_dot != 0);
}
std::tuple<u8, u8, bool> c65_state::get_sprite_pixel(int y, int x)
std::tuple<u8, u8, u8, bool> c65_state::get_sprite_pixel(int y, int x)
{
if (!m_sprite_enable)
return std::make_tuple(0, 0, false);
return std::make_tuple(0, 0, 0, false);
u8 enable_dot = 0;
u8 sprite_mask = 0;
u8 idx = 0;
const u32 base_offs = ((m_VIC2_VS_CB_Base & 0xf0) << 6) + 0x3f8;
// sprite #7 < #6 < ... < #0
@ -732,10 +742,11 @@ std::tuple<u8, u8, bool> c65_state::get_sprite_pixel(int y, int x)
{
const std::array<u8, 4> color_map = { 0, m_sprite_multicolor_clut[0], m_sprite[i].clut, m_sprite_multicolor_clut[1] };
sprite_mask |= 1 << i;
idx = i;
enable_dot = color_map[sprite_dot << color_shift];
}
}
return std::make_tuple(enable_dot, sprite_mask, enable_dot != 0);
return std::make_tuple(enable_dot, sprite_mask, idx, enable_dot != 0);
}
TIMER_CALLBACK_MEMBER(c65_state::scanline_cb)
@ -772,19 +783,19 @@ TIMER_CALLBACK_MEMBER(c65_state::scanline_cb)
p[x] = m_VIC2_EXTColor;
for (;x < active_right; x++)
{
u8 tile_dot, sprite_dot, sprite_mask;
u8 tile_dot, sprite_dot, sprite_mask, sprite_active;
bool is_foreground, is_sprite;
// TODO: functional depending on mode
// NOTE: VIC-II and VIC-III can switch mid-frame, but latches occur in 8 scanline steps
// at least from/to a base C=64 tilemap mode.
std::tie(tile_dot, is_foreground) = get_tile_pixel(y - active_top, x - active_left);
// HACK: are sprite positions in native coordinates from the border?
std::tie(sprite_dot, sprite_mask, is_sprite) = get_sprite_pixel(y + 20, x + active_left);
std::tie(sprite_dot, sprite_mask, sprite_active, is_sprite) = get_sprite_pixel(y + 20, x + active_left);
if (is_sprite)
p[x] = m_palette->pen(sprite_dot);
else
if (is_foreground && !(BIT(sprite_mask, sprite_active) & (BIT(m_sprite_priority ^ 0xff, sprite_active))))
p[x] = m_palette->pen(tile_dot);
else
p[x] = m_palette->pen(is_sprite ? sprite_dot : tile_dot);
}
for (;x < border_right; x++)
p[x] = m_VIC2_EXTColor;