UINT32 scv_state::screen_update_scv(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int x, y;
UINT8 fg = m_videoram[0x1403] >> 4;
UINT8 bg = m_videoram[0x1403] & 0x0f;
UINT8 gr_fg = m_videoram[0x1401] >> 4;
UINT8 gr_bg = m_videoram[0x1401] & 0x0f;
int clip_x = ( m_videoram[0x1402] & 0x0f ) * 2;
int clip_y = m_videoram[0x1402] >> 4;
/* Clear the screen */
bitmap.fill(gr_bg , cliprect);
/* Draw background */
for ( y = 0; y < 16; y++ )
{
int text_y = 0;
if ( y < clip_y )
{
text_y = ( m_videoram[0x1400] & 0x80 ) ? 0 : 1;
}
else
{
text_y = ( m_videoram[0x1400] & 0x80 ) ? 1 : 0;
}
for ( x = 0; x < 32; x++ )
{
int text_x = 0;
UINT8 d = m_videoram[ 0x1000 + y * 32 + x ];
if ( x < clip_x )
{
text_x = ( m_videoram[0x1400] & 0x40 ) ? 0 : 1;
}
else
{
text_x = ( m_videoram[0x1400] & 0x40 ) ? 1 : 0;
}
if ( text_x && text_y )
{
/* Text mode */
UINT8 *char_data = m_charrom->base() + ( d & 0x7f ) * 8;
draw_text( bitmap, x * 8, y * 16, char_data, fg, bg );
}
else
{
switch ( m_videoram[0x1400] & 0x03 )
{
case 0x01: /* Semi graphics mode */
draw_semi_graph( bitmap, x * 8 , y * 16 , d & 0x80, gr_fg );
draw_semi_graph( bitmap, x * 8 + 4, y * 16 , d & 0x40, gr_fg );
draw_semi_graph( bitmap, x * 8 , y * 16 + 4, d & 0x20, gr_fg );
draw_semi_graph( bitmap, x * 8 + 4, y * 16 + 4, d & 0x10, gr_fg );
draw_semi_graph( bitmap, x * 8 , y * 16 + 8, d & 0x08, gr_fg );
draw_semi_graph( bitmap, x * 8 + 4, y * 16 + 8, d & 0x04, gr_fg );
draw_semi_graph( bitmap, x * 8 , y * 16 + 12, d & 0x02, gr_fg );
draw_semi_graph( bitmap, x * 8 + 4, y * 16 + 12, d & 0x01, gr_fg );
break;
case 0x03: /* Block graphics mode */
draw_block_graph( bitmap, x * 8, y * 16 , d >> 4 );
draw_block_graph( bitmap, x * 8, y * 16 + 8, d & 0x0f );
break;
default: /* Otherwise draw nothing? */
break;
}
}
}
}
/* Draw sprites if enabled */
if ( m_videoram[0x1400] & 0x10 )
{
UINT8 screen_start_sprite_line = ( ( ( m_videoram[0x1400] & 0xf7 ) == 0x17 ) && ( ( m_videoram[0x1402] & 0xef ) == 0x4f ) ) ? 21 + 32 : 0 ;
int i;
for ( i = 0; i < 128; i++ )
{
UINT8 spr_y = m_videoram[ 0x1200 + i * 4 ] & 0xfe;
UINT8 y_32 = m_videoram[ 0x1200 + i * 4 ] & 0x01; /* Xx32 sprite */
UINT8 clip = m_videoram[ 0x1201 + i * 4 ] >> 4;
UINT8 col = m_videoram[ 0x1201 + i * 4 ] & 0x0f;
UINT8 spr_x = m_videoram[ 0x1202 + i * 4 ] & 0xfe;
UINT8 x_32 = m_videoram[ 0x1202 + i * 4 ] & 0x01; /* 32xX sprite */
UINT8 tile_idx = m_videoram[ 0x1203 + i * 4 ] & 0x7f;
UINT8 half = m_videoram[ 0x1203 + i * 4] & 0x80;
UINT8 left = 1;
UINT8 right = 1;
UINT8 top = 1;
UINT8 bottom = 1;
if ( !col )
{
continue;
}
if ( !spr_y )
{
continue;
}
if ( half )
{
if ( tile_idx & 0x40 )
{
if ( y_32 )
{
spr_y -= 8;
top = 0;
bottom = 1;
y_32 = 0;
}
else
{
top = 1;
bottom = 0;
}
}
if ( x_32 )
{
spr_x -= 8;
left = 0;
right = 1;
x_32 = 0;
}
else
{
left = 1;
right = 0;
}
}
/* Check if 2 color sprites are enabled */
if ( ( m_videoram[0x1400] & 0x20 ) && ( i & 0x20 ) )
{
/* 2 color sprite handling */
draw_sprite( bitmap, spr_x, spr_y, tile_idx, col, left, right, top, bottom, clip, screen_start_sprite_line );
if ( x_32 || y_32 )
{
static const UINT8 spr_2col_lut0[16] = { 0, 15, 12, 13, 10, 11, 8, 9, 6, 7, 4, 5, 2, 3, 1, 1 };
static const UINT8 spr_2col_lut1[16] = { 0, 1, 8, 11, 2, 3, 10, 9, 4, 5, 12, 13, 6, 7, 14, 15 };
draw_sprite( bitmap, spr_x, spr_y, tile_idx ^ ( 8 * x_32 + y_32 ), ( i & 0x40 ) ? spr_2col_lut1[col] : spr_2col_lut0[col], left, right, top, bottom, clip, screen_start_sprite_line );
}
}
else
{
/* regular sprite handling */
draw_sprite( bitmap, spr_x, spr_y, tile_idx, col, left, right, top, bottom, clip, screen_start_sprite_line );
if ( x_32 )
{
draw_sprite( bitmap, spr_x + 16, spr_y, tile_idx | 8, col, 1, 1, top, bottom, clip, screen_start_sprite_line );
}
if ( y_32 )
{
clip = ( clip & 0x08 ) ? ( clip & 0x07 ) : 0;
draw_sprite( bitmap, spr_x, spr_y + 16, tile_idx | 1, col, left, right, 1, 1, clip, screen_start_sprite_line );
if ( x_32 )
{
draw_sprite( bitmap, spr_x + 16, spr_y + 16, tile_idx | 9, col, 1, 1, 1, 1, clip, screen_start_sprite_line );
}
}
}
}
}
static SCREEN_UPDATE( scv )
{
scv_state *state = screen->machine().driver_data<scv_state>();
int x, y;
UINT8 fg = state->m_vram[0x1403] >> 4;
UINT8 bg = state->m_vram[0x1403] & 0x0f;
UINT8 gr_fg = state->m_vram[0x1401] >> 4;
UINT8 gr_bg = state->m_vram[0x1401] & 0x0f;
int clip_x = ( state->m_vram[0x1402] & 0x0f ) * 2;
int clip_y = state->m_vram[0x1402] >> 4;
/* Clear the screen */
bitmap_fill( bitmap, cliprect, gr_bg );
/* Draw background */
for ( y = 0; y < 16; y++ )
{
int text_y = 0;
if ( y < clip_y )
text_y = ( state->m_vram[0x1400] & 0x80 ) ? 0 : 1;
else
text_y = ( state->m_vram[0x1400] & 0x80 ) ? 1 : 0;
for ( x = 0; x < 32; x++ )
{
int text_x = 0;
UINT8 d = state->m_vram[ 0x1000 + y * 32 + x ];
if ( x < clip_x )
text_x = ( state->m_vram[0x1400] & 0x40 ) ? 0 : 1;
else
text_x = ( state->m_vram[0x1400] & 0x40 ) ? 1 : 0;
if ( text_x && text_y )
{
/* Text mode */
UINT8 *char_data = screen->machine().region( "charrom" )->base() + ( d & 0x7f ) * 8;
draw_text( bitmap, x * 8, y * 16, char_data, fg, bg );
}
else
{
switch ( state->m_vram[0x1400] & 0x03 )
{
case 0x01: /* Semi graphics mode */
draw_semi_graph( bitmap, x * 8 , y * 16 , d & 0x80, gr_fg );
draw_semi_graph( bitmap, x * 8 + 4, y * 16 , d & 0x40, gr_fg );
draw_semi_graph( bitmap, x * 8 , y * 16 + 4, d & 0x20, gr_fg );
draw_semi_graph( bitmap, x * 8 + 4, y * 16 + 4, d & 0x10, gr_fg );
draw_semi_graph( bitmap, x * 8 , y * 16 + 8, d & 0x08, gr_fg );
draw_semi_graph( bitmap, x * 8 + 4, y * 16 + 8, d & 0x04, gr_fg );
draw_semi_graph( bitmap, x * 8 , y * 16 + 12, d & 0x02, gr_fg );
draw_semi_graph( bitmap, x * 8 + 4, y * 16 + 12, d & 0x01, gr_fg );
break;
case 0x03: /* Block graphics mode */
draw_block_graph( bitmap, x * 8, y * 16 , d >> 4 );
draw_block_graph( bitmap, x * 8, y * 16 + 8, d & 0x0f );
break;
default: /* Otherwise draw nothing? */
break;
}
}
}
}
/* Draw sprites if enabled */
if ( state->m_vram[0x1400] & 0x10 )
{
int i;
for ( i = 0; i < 128; i++ )
{
UINT8 spr_y = state->m_vram[ 0x1200 + i * 4 ] & 0xfe;
UINT8 y_32 = state->m_vram[ 0x1200 + i * 4 ] & 0x01; /* Xx32 sprite */
UINT8 clip = state->m_vram[ 0x1201 + i * 4 ] >> 4;
UINT8 col = state->m_vram[ 0x1201 + i * 4 ] & 0x0f;
UINT8 spr_x = state->m_vram[ 0x1202 + i * 4 ] & 0xfe;
UINT8 x_32 = state->m_vram[ 0x1202 + i * 4 ] & 0x01; /* 32xX sprite */
UINT8 tile_idx = state->m_vram[ 0x1203 + i * 4 ] & 0x7f;
UINT8 half = state->m_vram[ 0x1203 + i * 4] & 0x80;
UINT8 left = 1;
UINT8 right = 1;
UINT8 top = 1;
UINT8 bottom = 1;
if ( !col )
continue;
if ( !spr_y )
continue;
if ( half )
{
if ( tile_idx & 0x40 )
{
if ( y_32 )
{
spr_y -= 8;
top = 0;
bottom = 1;
y_32 = 0;
}
else
{
top = 1;
bottom = 0;
}
}
if ( x_32 )
{
spr_x -= 8;
left = 0;
right = 1;
x_32 = 0;
}
else
{
left = 1;
right = 0;
}
}
/* Check if 2 color sprites are enabled */
if ( ( state->m_vram[0x1400] & 0x20 ) && ( i & 0x20 ) )
{
/* 2 color sprite handling */
draw_sprite( state, bitmap, spr_x, spr_y, tile_idx, col, left, right, top, bottom, clip );
if ( x_32 || y_32 )
{
static const UINT8 spr_2col_lut0[16] = { 0, 15, 12, 13, 10, 11, 8, 9, 6, 7, 4, 5, 2, 3, 1, 1 };
static const UINT8 spr_2col_lut1[16] = { 0, 1, 8, 11, 2, 3, 10, 9, 4, 5, 12, 13, 6, 7, 14, 15 };
draw_sprite( state, bitmap, spr_x, spr_y, tile_idx + 8 * x_32 + y_32, ( i & 0x40 ) ? spr_2col_lut1[col] : spr_2col_lut0[col], left, right, top, bottom, clip );
}
}
else
{
/* regular sprite handling */
draw_sprite( state, bitmap, spr_x, spr_y, tile_idx, col, left, right, top, bottom, clip );
if ( x_32 )
{
draw_sprite( state, bitmap, spr_x + 16, spr_y, tile_idx + 8, col, 1, 1, top, bottom, clip );
}
if ( y_32 )
{
clip &= 0x07;
draw_sprite( state, bitmap, spr_x, spr_y + 16, tile_idx + 1, col, left, right, 1, 1, clip );
if ( x_32 )
{
draw_sprite( state, bitmap, spr_x + 16, spr_y + 16, tile_idx + 9, col, 1, 1, 1, 1, clip );
}
}
}
}
}