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Merge pull request #6255 from cam900/twin16_clip

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twin16.cpp : Restrict sprite drawing routine into screen cliprect
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R. Belmont 2020-02-04 13:03:23 -05:00 committed by GitHub
commit e2cc495dd7
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2 changed files with 7 additions and 7 deletions
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2
src/mame/includes/twin16.h
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@ -106,7 +106,7 @@ protected:
int set_sprite_timer();
void spriteram_process();
void draw_sprites( screen_device &screen, bitmap_ind16 &bitmap );
void draw_sprites( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect );
int spriteram_process_enable();
void twin16_postload();
};

12
src/mame/video/twin16.cpp
View File

@ -260,7 +260,7 @@ void twin16_state::spriteram_process( )
m_need_process_spriteram = 0;
}
void twin16_state::draw_sprites( screen_device &screen, bitmap_ind16 &bitmap )
void twin16_state::draw_sprites( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect )
{
const uint16_t *source = 0x1800+m_spriteram->buffer() + 0x800 - 4;
const uint16_t *finish = 0x1800+m_spriteram->buffer();
@ -331,14 +331,14 @@ void twin16_state::draw_sprites( screen_device &screen, bitmap_ind16 &bitmap )
xpos = 320-xpos-width;
flipx = !flipx;
}
if( xpos>=320 ) xpos -= 65536;
if( ypos>=256 ) ypos -= 65536;
if( xpos>cliprect.max_x ) xpos -= 65536;
if( ypos>cliprect.max_y ) ypos -= 65536;
/* slow slow slow, but it's ok for now */
for( y=0; y<height; y++, pen_data += width/4 )
{
int sy = (flipy)?(ypos+height-1-y):(ypos+y);
if( sy>=16 && sy<256-16 )
if( sy>=cliprect.min_y && sy<=cliprect.max_y )
{
uint16_t *dest = &bitmap.pix16(sy);
uint8_t *pdest = &screen.priority().pix8(sy);
@ -346,7 +346,7 @@ void twin16_state::draw_sprites( screen_device &screen, bitmap_ind16 &bitmap )
for( x=0; x<width; x++ )
{
int sx = (flipx)?(xpos+width-1-x):(xpos+x);
if( sx>=0 && sx<320 )
if( sx>=cliprect.min_x && sx<=cliprect.max_x )
{
uint16_t pen = pen_data[x>>2]>>((~x&3)<<2)&0xf;
@ -538,7 +538,7 @@ uint32_t twin16_state::screen_update_twin16(screen_device &screen, bitmap_ind16
break;
}
draw_sprites( screen, bitmap );
draw_sprites( screen, bitmap, cliprect );
m_fixed_tmap->draw(screen, bitmap, cliprect, 0);
return 0;