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clgd542x: added reverse direction BitBLTs, and improved colour-expanded pattern handling (still not quite perfect, though)

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This commit is contained in:
mahlemiut 2015-05-03 11:44:00 +12:00
parent b76daef85a
commit d1a79df509
2 changed files with 74 additions and 13 deletions
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86
src/emu/video/clgd542x.c
View File

@ -257,6 +257,12 @@ void cirrus_gd5428_device::start_bitblt()
{
UINT32 x,y;
if(m_blt_mode & 0x01)
{
start_reverse_bitblt();
return;
}
if(LOG_BLIT) logerror("CL: BitBLT started: Src: %06x Dst: %06x Width: %i Height %i ROP: %02x Mode: %02x\n",m_blt_source,m_blt_dest,m_blt_width,m_blt_height,m_blt_rop,m_blt_mode);
m_blt_source_current = m_blt_source;
@ -271,7 +277,7 @@ void cirrus_gd5428_device::start_bitblt()
UINT8 pixel = (vga.memory[m_blt_source_current % vga.svga_intf.vram_size] >> (7-(x % 8)) & 0x01) ? vga.gc.enable_set_reset : vga.gc.set_reset; // use GR0/1/10/11 background/foreground regs
copy_pixel(pixel, vga.memory[m_blt_dest_current % vga.svga_intf.vram_size]);
if(x % 8)
if((x % 8) == 7 && !(m_blt_mode & 0x40)) // don't increment if a pattern (it's only 8 bits)
m_blt_source_current++;
}
else
@ -281,17 +287,77 @@ void cirrus_gd5428_device::start_bitblt()
}
m_blt_dest_current++;
if(m_blt_mode & 0x40 && (x % 8) == 7) // 8x8 pattern - reset pattern source location
m_blt_source_current = m_blt_source + (8*(y % 8)); // patterns are linear data
{
if(m_blt_mode & 0x80) // colour expand
m_blt_source_current = m_blt_source + (1*(y % 8)); // patterns are linear data
else
m_blt_source_current = m_blt_source + (8*(y % 8));
}
}
if(m_blt_mode & 0x40) // 8x8 pattern
m_blt_source_current = m_blt_source + (8*(y % 8)); // patterns are linear data
{
if(m_blt_mode & 0x80) // colour expand
m_blt_source_current = m_blt_source + (1*(y % 8)); // patterns are linear data
else
m_blt_source_current = m_blt_source + (8*(y % 8));
}
else
m_blt_source_current = m_blt_source + (m_blt_source_pitch*y);
m_blt_source_current = m_blt_source + (m_blt_source_pitch*(y+1));
m_blt_dest_current = m_blt_dest + (m_blt_dest_pitch*(y+1));
}
m_blt_status &= ~0x02;
}
void cirrus_gd5428_device::start_reverse_bitblt()
{
UINT32 x,y;
if(LOG_BLIT) logerror("CL: Reverse BitBLT started: Src: %06x Dst: %06x Width: %i Height %i ROP: %02x Mode: %02x\n",m_blt_source,m_blt_dest,m_blt_width,m_blt_height,m_blt_rop,m_blt_mode);
// Start at end of blit
m_blt_source_current = m_blt_source;
m_blt_dest_current = m_blt_dest;
for(y=0;y<=m_blt_height;y++)
{
for(x=0;x<=m_blt_width;x++)
{
if(m_blt_mode & 0x80) // colour expand
{
UINT8 pixel = (vga.memory[m_blt_source_current % vga.svga_intf.vram_size] >> (7-(x % 8)) & 0x01) ? vga.gc.enable_set_reset : vga.gc.set_reset; // use GR0/1/10/11 background/foreground regs
copy_pixel(pixel, vga.memory[m_blt_dest_current % vga.svga_intf.vram_size]);
if((x % 8) == 7 && !(m_blt_mode & 0x40)) // don't decrement if a pattern (it's only 8 bits)
m_blt_source_current--;
}
else
{
copy_pixel(vga.memory[m_blt_source_current % vga.svga_intf.vram_size], vga.memory[m_blt_dest_current % vga.svga_intf.vram_size]);
m_blt_source_current--;
}
m_blt_dest_current--;
if(m_blt_mode & 0x40 && (x % 8) == 7) // 8x8 pattern - reset pattern source location
{
if(m_blt_mode & 0x80) // colour expand
m_blt_source_current = m_blt_source - (1*(y % 8)); // patterns are linear data
else
m_blt_source_current = m_blt_source - (8*(y % 8));
}
}
if(m_blt_mode & 0x40) // 8x8 pattern
{
if(m_blt_mode & 0x80) // colour expand
m_blt_source_current = m_blt_source - (1*(y % 8)); // patterns are linear data
else
m_blt_source_current = m_blt_source - (8*(y % 8));
}
else
m_blt_source_current = m_blt_source - (m_blt_source_pitch*(y+1));
m_blt_dest_current = m_blt_dest - (m_blt_dest_pitch*(y+1));
}
m_blt_status &= ~0x02;
}
void cirrus_gd5428_device::start_system_bitblt()
{
if(LOG_BLIT) logerror("CL: BitBLT from system memory started: Src: %06x Dst: %06x Width: %i Height %i ROP: %02x Mode: %02x\n",m_blt_source,m_blt_dest,m_blt_width,m_blt_height,m_blt_rop,m_blt_mode);
@ -301,7 +367,7 @@ void cirrus_gd5428_device::start_system_bitblt()
m_blt_pixel_count = m_blt_scan_count = 0;
m_blt_source_current = m_blt_source;
m_blt_dest_current = m_blt_dest;
m_blt_status |= 0x01;
m_blt_status |= 0x09;
}
void cirrus_gd5428_device::blit_dword()
@ -339,18 +405,12 @@ void cirrus_gd5428_device::blit_dword()
if(m_blt_scan_count > m_blt_height)
{
m_blt_system_transfer = false; // BitBLT complete
m_blt_status &= ~0x03;
m_blt_status &= ~0x0b;
}
}
void cirrus_gd5428_device::copy_pixel(UINT8 src, UINT8 dst)
{
if(m_blt_mode & 0x40) // enable 8x8 pattern
{
if(m_blt_mode & 0x80) // colour expand
src = (vga.memory[m_blt_source % vga.svga_intf.vram_size] >> (abs((int)(m_blt_source_current - m_blt_source)) % 8)) & 0x01 ? vga.gc.enable_set_reset : vga.gc.set_reset;
}
switch(m_blt_rop)
{
case 0x00: // BLACK
@ -366,7 +426,7 @@ void cirrus_gd5428_device::copy_pixel(UINT8 src, UINT8 dst)
vga.memory[m_blt_dest_current % vga.svga_intf.vram_size] = 0xff;
break;
case 0x59: // SRCINVERT
vga.memory[m_blt_dest_current % vga.svga_intf.vram_size] = dst ^ src;
vga.memory[m_blt_dest_current % vga.svga_intf.vram_size] = src ^ dst;
break;
default:
popmessage("CL: Unsupported BitBLT ROP mode %02x",m_blt_rop);

1
src/emu/video/clgd542x.h
View File

@ -88,6 +88,7 @@ private:
void cirrus_crtc_reg_write(UINT8 index, UINT8 data);
void start_bitblt();
void start_reverse_bitblt();
void start_system_bitblt();
void blit_dword();
void copy_pixel(UINT8 src, UINT8 dst);