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add line doubling

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This commit is contained in:
David Haywood 2017-11-16 13:44:19 +00:00
parent 439ed4ee3f
commit a7fc8e286f
1 changed files with 38 additions and 7 deletions
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45
src/mame/drivers/pgm2.cpp
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@ -570,7 +570,7 @@ void pgm2_state::draw_sprites(screen_device &screen, const rectangle &cliprect,
int endoflist = -1;
// printf("frame\n");
//printf("frame\n");
for (int i = 0;i < 0x2000 / 4;i++)
{
@ -592,12 +592,21 @@ void pgm2_state::draw_sprites(screen_device &screen, const rectangle &cliprect,
int pal = (spriteram[i + 0] & 0x0fc00000) >> 22;
int pri = (spriteram[i + 0] & 0x80000000) >> 31;
//int unk0 = (spriteram[i + 0] & 0x70000000) >> 0;
int sizex = (spriteram[i + 1] & 0x0000003f) >> 0;
int sizey = (spriteram[i + 1] & 0x00007fc0) >> 6;
int flipx = (spriteram[i + 1] & 0x00800000) >> 23;
int flipy = (spriteram[i + 1] & 0x80000000) >> 31; // more of a 'reverse entire drawing' flag than y-flip, but used for that purpose
//int zoomx = (spriteram[i + 1] & 0x001f0000) >> 16; // might be 7f
int zoomy = (spriteram[i + 1] & 0x1f000000) >> 24; // might be 7f
//int zoomx = (spriteram[i + 1] & 0x001f0000) >> 16;
//int growx = (spriteram[i + 1] & 0x00200000) >> 21;
int zoomy = (spriteram[i + 1] & 0x1f000000) >> 24;
int growy = (spriteram[i + 1] & 0x20000000) >> 29;
//int unk1 = (spriteram[i + 1] & 0x40408000) >> 0;
//if (unk0 || unk1)
// printf("unused bits set unk0 %08x unk1 %08x\n", unk0, unk1);
int mask_offset = (spriteram[i + 2]<<1);
int palette_offset = (spriteram[i + 3]);
@ -617,12 +626,34 @@ void pgm2_state::draw_sprites(screen_device &screen, const rectangle &cliprect,
int realy = y;
for (int ydraw = 0; ydraw < sizey; ydraw++)
int sourceline = 0;
for (int ydraw = 0; ydraw < sizey;sourceline++)
{
int zoomy_bit = (zoomy_bits >> (ydraw & 0x1f)) & 1;
int zoomy_bit = (zoomy_bits >> (sourceline & 0x1f)) & 1;
draw_sprite_line(cliprect, mask_offset, palette_offset, x, realy, flipx, flipy, sizex, pal, zoomy_bit);
if (zoomy_bit) realy++;
// store these for when we need to draw a line twice
uint32_t pre_palette_offset = palette_offset;
uint32_t pre_mask_offset = mask_offset;
if (!growy) // skipping lines
{
draw_sprite_line(cliprect, mask_offset, palette_offset, x, realy, flipx, flipy, sizex, pal, zoomy_bit);
if (zoomy_bit) realy++;
ydraw++;
}
else // doubling lines
{
draw_sprite_line(cliprect, mask_offset, palette_offset, x, realy, flipx, flipy, sizex, pal, 1);
realy++;
if (zoomy_bit)
{
palette_offset = pre_palette_offset;
mask_offset = pre_mask_offset;
}
else ydraw++;
}
}
}