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Diffstat (limited to 'src/mame/drivers/pgm2.cpp')
-rw-r--r--src/mame/drivers/pgm2.cpp45
1 files changed, 38 insertions, 7 deletions
diff --git a/src/mame/drivers/pgm2.cpp b/src/mame/drivers/pgm2.cpp
index 6329aef08e1..45cd904691b 100644
--- a/src/mame/drivers/pgm2.cpp
+++ b/src/mame/drivers/pgm2.cpp
@@ -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++;
+ }
}
}