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seta2: improve tilemap wrapping in 8x8 mode, helps grdians intro

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This commit is contained in:
DavidHaywood 2018-12-07 17:31:34 +00:00
parent f9c694b236
commit ef93f30cee
1 changed files with 52 additions and 20 deletions
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72
src/mame/video/seta2.cpp
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@ -326,16 +326,56 @@ inline void seta2_state::drawgfx_line(bitmap_ind16 &bitmap, const rectangle &cli
}
}
// takes an x/y pixel position in the virtual tilemap and returns the code + attributes etc. for it
inline void seta2_state::get_tile(uint16_t* spriteram, int is_16x16, int x, int y, int page, int& code, int& attr, int& flipx, int& flipy, int& color)
{
uint16_t *s3 = &spriteram[2 * ((page * 0x2000 / 4) + ((y & 0x1f) << 6) + (x & 0x03f))];
int xtile = x >> (is_16x16 ? 4 : 3);
int ytile = y >> (is_16x16 ? 4 : 3);
// yes the tilemap in RAM is flipped?!
ytile ^= 0x1f;
uint16_t *s3 = &spriteram[2 * ((page * 0x2000 / 4) + ((ytile & 0x1f) << 6) + ((xtile) & 0x03f))];
attr = s3[0];
code = s3[1] + ((attr & 0x0007) << 16);
flipx = (attr & 0x0010);
flipy = (attr & 0x0008);
color = (attr & 0xffe0) >> 5;
if (is_16x16)
{
code &= ~3;
if (!flipx)
{
if (x & 8)
{
code += 1;
}
}
else
{
if (!(x & 8))
{
code += 1;
}
}
if (!flipy)
{
if (y & 8)
{
code += 2;
}
}
else
{
if (!(y & 8))
{
code += 2;
}
}
}
}
void seta2_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect)
@ -447,30 +487,22 @@ void seta2_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int sourceline = (realline - scrolly) & 0x1ff;
int y = sourceline >> (is_16x16 ? 4 : 3);
for (int x = 0; x < 0x40; x++)
// we treat 16x16 tiles as 4 8x8 tiles, so while the tilemap is 0x40 tiles wide in memory, that becomes 0x80 tiles in 16x16 mode, with the data wrapping in 8x8 mode
for (int x = 0; x < 0x80; x++)
{
int code, attr, flipx, flipy, color;
// tilemap data is NOT buffered? (and yes the tilemap in RAM is flipped?!)
get_tile(spriteram, is_16x16, x, y ^ 0x1f, page, code, attr, flipx, flipy, color);
// tilemap data is NOT buffered?
get_tile(spriteram, is_16x16, x * 8, sourceline, page, code, attr, flipx, flipy, color);
int line = is_16x16 ? (sourceline & 0x0f) : (sourceline & 0x07);
int tileline = sourceline & 0x07;
int dx = sx + (scrollx & 0x3ff) + xoffs + 0x10;
int px = (((dx + x * 8) + 0x10) & 0x3ff) - 0x10;
int dst_x = px & 0x3ff;
dst_x = (dst_x & 0x1ff) - (dst_x & 0x200);
int ty = (line >> 3) & 1;
line &= 0x7;
for (int tx = 0; tx <= is_16x16; tx++)
if ((dst_x >= clip.min_x - 8) && (dst_x <= clip.max_x))
{
int dx = sx + (scrollx & 0x3ff) + xoffs + 0x10;
int px = ((dx + x * (8 << is_16x16) + 0x10) & 0x3ff) - 0x10;
int dst_x = (px + (flipx ? is_16x16 - tx : tx) * 8) & 0x3ff;
dst_x = (dst_x & 0x1ff) - (dst_x & 0x200);
if ((dst_x >= clip.min_x - 8) && (dst_x <= clip.max_x))
{
int realcode = code ^ tx ^ ((flipy ? is_16x16 - ty : ty) << 1);
drawgfx_line(bitmap, clip, which_gfx, m_spritegfx->get_data(m_realtilenumber[realcode]), color << 4, flipx, flipy, dst_x, use_shadow, realline, line, opaque);
}
drawgfx_line(bitmap, clip, which_gfx, m_spritegfx->get_data(m_realtilenumber[code]), color << 4, flipx, flipy, dst_x, use_shadow, realline, tileline, opaque);
}
}
}