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slight change to the bg rendering, preparation for blending

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This commit is contained in:
David Haywood 2013-02-27 13:48:24 +00:00
parent aaec22f4d1
commit 787baa5972
1 changed files with 10 additions and 12 deletions
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22
src/mame/drivers/coolridr.c
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@ -672,25 +672,23 @@ UINT32 coolridr_state::screen_update_coolridr(screen_device &screen, bitmap_rgb3
bitmap.fill(MAKE_ARGB(0xff,pal5bit(bg_r),pal5bit(bg_g),pal5bit(bg_b)),cliprect);
for (int y=0;y<64;y++)
UINT16 basey = scrolly>>4;
for (int y=0;y<25;y++)
{
for (int x=0;x<128;x++)
UINT16 basex = scrollx>>4;
for (int x=0;x<32;x++)
{
int res_x,res_y;
res_x = (x*16)-scrollx;
res_y = (y*16)-scrolly;
vram_data = (m_h1_vram[x+y*128+base_offset] & 0xffff);
vram_data = (m_h1_vram[(basex&0x7f)+((basey&0x3f)*0x80)+base_offset] & 0xffff);
color = m_color_bank + ((vram_data & 0x800) >> 11) * 4;
/* bike select enables bits 15-12, pretty sure one of these is tile bank (because there's a solid pen on 0x3ff / 0x7ff). */
tile = (vram_data & 0x7ff) | ((vram_data & 0x8000) >> 4);
drawgfx_transpen(bitmap,cliprect,gfx,tile,color,0,0,res_x,res_y,transpen_setting ? -1 : 0);
drawgfx_transpen(bitmap,cliprect,gfx,tile,color,0,0,res_x+2048,res_y,transpen_setting ? -1 : 0);
drawgfx_transpen(bitmap,cliprect,gfx,tile,color,0,0,res_x,res_y+1024,transpen_setting ? -1 : 0);
drawgfx_transpen(bitmap,cliprect,gfx,tile,color,0,0,res_x+2048,res_y+1024,transpen_setting ? -1 : 0);
drawgfx_transpen(bitmap,cliprect,gfx,tile,color,0,0,(x*16)-(scrollx&0xf),(y*16)-(scrolly&0xf),transpen_setting ? -1 : 0);
basex++;
}
basey++;
}
}