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fmtowns: support vertical zoom greater than x2. Fixes Evolution.

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This commit is contained in:
mahlemiut 2017-08-19 11:36:34 +12:00
parent b32c62dc29
commit 8b623d842c
1 changed files with 37 additions and 35 deletions
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72
src/mame/video/fmtowns.cpp
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@ -15,8 +15,8 @@
* 0: HSync width 1
* 1: HSync width 2
* 4: HSync total
* 5: VSync width 1
* 6: VSync width 2
* 5: VSync period 1
* 6: VSync period 2
* 7: Equalising pulse accountable time (what?)
* 8: VSync total
*
@ -30,17 +30,17 @@
* 15:
* 16: Graphic layer 1 vertical start/end
*
* 17: Graphic layer 0 initial address?
* 17: Graphic layer 0 frame start address
* 18: Graphic layer 0 horizontal adjust
* 19: Graphic layer 0 field indirect address offset
* 20: Graphic layer 0 line indirect address offset
*
* 21-24: As above, but for Graphic layer 1
*
* 27: Layer zoom. bit 0 = x2 horizontal zoom layer 0
* to be confirmed bit 5 = x2 vertical zoom layer 0
* bit 9 = x2 horizontal zoom layer 1
* bit 13 = x2 vertical zoom layer 1
* 27: Layer zoom. bits 0-3 = horizontal zoom layer 0
* (0 = x1, 1 = x2, bits 4-7 = vertical zoom layer 0
* 2 = x3...) bits 8-11 = horizontal zoom layer 1
* bits 12-15 = vertical zoom layer 1
*
* 28: Control register 0
* VSync enable (bit 15) (blank display?)
@ -1431,49 +1431,51 @@ void towns_state::towns_crtc_draw_layer(bitmap_rgb32 &bitmap,const rectangle* re
int line;
int scanline;
int height;
uint8_t zoom;
uint8_t count;
if(layer == 0)
{
scanline = rect->min_y;
height = (rect->max_y - rect->min_y);
if(m_video.towns_crtc_reg[27] & 0x0010)
height /= 2;
zoom = ((m_video.towns_crtc_reg[27] & 0x00f0) >> 4) + 1;
height /= zoom;
switch(m_video.towns_video_reg[0] & 0x03)
{
case 0x01:
for(line=0;line<height;line++)
{
towns_crtc_draw_scan_layer_16(bitmap,rect,layer,line,scanline);
scanline++;
if(m_video.towns_crtc_reg[27] & 0x0010) // vertical zoom
count = 0;
do
{
towns_crtc_draw_scan_layer_16(bitmap,rect,layer,line,scanline);
scanline++;
}
count++;
} while(count < zoom);
}
break;
case 0x02:
for(line=0;line<height;line++)
{
towns_crtc_draw_scan_layer_256(bitmap,rect,layer,line,scanline);
scanline++;
if(m_video.towns_crtc_reg[27] & 0x0010) // vertical zoom
count = 0;
do
{
towns_crtc_draw_scan_layer_256(bitmap,rect,layer,line,scanline);
scanline++;
}
count++;
} while(count < zoom);
}
break;
case 0x03:
for(line=0;line<height;line++)
{
towns_crtc_draw_scan_layer_hicolour(bitmap,rect,layer,line,scanline);
scanline++;
if(m_video.towns_crtc_reg[27] & 0x0010) // vertical zoom
count = 0;
do
{
towns_crtc_draw_scan_layer_hicolour(bitmap,rect,layer,line,scanline);
scanline++;
}
count++;
} while(count < zoom);
}
break;
}
@ -1482,44 +1484,44 @@ void towns_state::towns_crtc_draw_layer(bitmap_rgb32 &bitmap,const rectangle* re
{
scanline = rect->min_y;
height = (rect->max_y - rect->min_y);
if(m_video.towns_crtc_reg[27] & 0x1000)
height /= 2;
zoom = ((m_video.towns_crtc_reg[27] & 0xf000) >> 12) + 1;
height /= zoom;
switch(m_video.towns_video_reg[0] & 0x0c)
{
case 0x04:
for(line=0;line<height;line++)
{
towns_crtc_draw_scan_layer_16(bitmap,rect,layer,line,scanline);
scanline++;
if(m_video.towns_crtc_reg[27] & 0x1000) // vertical zoom
count = 0;
do
{
towns_crtc_draw_scan_layer_16(bitmap,rect,layer,line,scanline);
scanline++;
}
count++;
} while(count < zoom);
}
break;
case 0x08:
for(line=0;line<height;line++)
{
towns_crtc_draw_scan_layer_256(bitmap,rect,layer,line,scanline);
scanline++;
if(m_video.towns_crtc_reg[27] & 0x1000) // vertical zoom
count = 0;
do
{
towns_crtc_draw_scan_layer_256(bitmap,rect,layer,line,scanline);
scanline++;
}
count++;
} while(count < zoom);
}
break;
case 0x0c:
for(line=0;line<height;line++)
{
towns_crtc_draw_scan_layer_hicolour(bitmap,rect,layer,line,scanline);
scanline++;
if(m_video.towns_crtc_reg[27] & 0x1000) // vertical zoom
count = 0;
do
{
towns_crtc_draw_scan_layer_hicolour(bitmap,rect,layer,line,scanline);
scanline++;
}
count++;
} while(count < zoom);
}
break;
}