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snk/mainsnk.cpp: Suppress side effects for debugger reads and cleaned up code. (#13445)

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Cleaned up graphics decoding layouts, use bit helpers, made some variables const.
This commit is contained in:
cam900 2025-03-05 23:55:53 +09:00 committed by GitHub
parent a90981be5f
commit 4d7370bcbc
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GPG Key ID: B5690EEEBB952194
1 changed files with 14 additions and 14 deletions
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28
src/mame/snk/mainsnk.cpp
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@ -138,7 +138,7 @@ public:
m_fgram(*this, "fgram")
{ }
void mainsnk(machine_config &config);
void mainsnk(machine_config &config) ATTR_COLD;
protected:
virtual void video_start() override ATTR_COLD;
@ -213,7 +213,7 @@ TILEMAP_MAPPER_MEMBER(mainsnk_state::tx_scan_cols)
// tilemap is 36x28, the central part is from the first RAM page and the
// extra 4 columns are from the second page
col -= 2;
if (col & 0x20)
if (BIT(col, 5))
return 0x400 + row + ((col & 0x1f) << 5);
else
return row + (col << 5);
@ -221,17 +221,17 @@ TILEMAP_MAPPER_MEMBER(mainsnk_state::tx_scan_cols)
TILE_GET_INFO_MEMBER(mainsnk_state::get_tx_tile_info)
{
int code = m_fgram[tile_index];
int const code = m_fgram[tile_index];
tileinfo.set(0,
code,
0,
tile_index & 0x400 ? TILE_FORCE_LAYER0 : 0);
BIT(tile_index, 10) ? TILE_FORCE_LAYER0 : 0);
}
TILE_GET_INFO_MEMBER(mainsnk_state::get_bg_tile_info)
{
int code = (m_bgram[tile_index]);
int const code = (m_bgram[tile_index]);
tileinfo.set(0,
m_bg_tile_offset + code,
@ -257,7 +257,7 @@ void mainsnk_state::video_start()
void mainsnk_state::c600_w(uint8_t data)
{
int total_elements = m_gfxdecode->gfx(0)->elements();
int const total_elements = m_gfxdecode->gfx(0)->elements();
flip_screen_set(BIT(data, 7));
@ -299,13 +299,13 @@ void mainsnk_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect
while (source < finish)
{
int attributes = source[3];
int const attributes = source[3];
int tile_number = source[1];
int sy = source[0];
int sx = source[2];
int color = attributes & 0xf;
int flipx = 0;
int flipy = 0;
int const color = attributes & 0xf;
bool flipx = false;
bool flipy = false;
if (sy > 240) sy -= 256;
tile_number |= attributes << 4 & 0x300;
@ -344,7 +344,8 @@ uint32_t mainsnk_state::screen_update(screen_device &screen, bitmap_ind16 &bitma
uint8_t mainsnk_state::sound_ack_r()
{
m_audiocpu->set_input_line(0, CLEAR_LINE);
if (!machine().side_effects_disabled())
m_audiocpu->set_input_line(0, CLEAR_LINE);
return 0xff;
}
@ -573,9 +574,8 @@ static const gfx_layout sprite_layout =
RGN_FRAC(1,3),
3,
{ RGN_FRAC(2,3),RGN_FRAC(1,3),RGN_FRAC(0,3) },
{ 7,6,5,4,3,2,1,0, 15,14,13,12,11,10,9,8 },
{ 0*16, 1*16, 2*16, 3*16, 4*16, 5*16, 6*16, 7*16,
8*16, 9*16, 10*16, 11*16, 12*16, 13*16, 14*16, 15*16 },
{ STEP8(7,-1), STEP8(15,-1) },
{ STEP16(0,16) },
256
};