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funtech/supracan.cpp: assume sprite ysizes are non-linear

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This commit is contained in:
angelosa 2024-09-15 14:19:48 +02:00
parent 15dd5beab4
commit f20a89c455
1 changed files with 32 additions and 6 deletions
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38
src/mame/funtech/supracan.cpp
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@ -293,6 +293,8 @@ private:
int supracan_state::get_tilemap_region(int layer)
{
// TODO: anything that refers to 2bpp region (2) can actually be layer 1bpp selectable too
// From layer mode bit 7?
switch(layer)
{
case 0:
@ -301,7 +303,6 @@ int supracan_state::get_tilemap_region(int layer)
case 1:
static const int layer1_mode[8] = { 2, 1, 1, 1, 2, 2, 2, 2 };
return layer1_mode[m_gfx_mode & 7];
// HACK: can be 2bpp or 1bpp
case 2:
return 2;
case 3:
@ -325,13 +326,15 @@ void supracan_state::get_tilemap_info_common(int layer, tile_data &tileinfo, int
uint16_t tile_bank = 0;
uint16_t palette_shift = 0;
// TODO: convert this to a static table, verify case 7
switch (gfx_mode)
{
case 7:
tile_bank = 0x1c00;
break;
case 6: // gambling lord
// gamblord
case 6:
tile_bank = 0x0c00;
break;
@ -808,6 +811,24 @@ void supracan_state::draw_sprites(bitmap_ind16 &bitmap, bitmap_ind8 &maskmap, bi
{
uint16_t *vram = m_vram;
// ysizes are normally setting +1, except on higher ranges where values are higher
// TODO: check on real HW
static const int ysizes_table[16] = {
1, 2, 3, 4, 5, 6, 7, 8, 9,
// 0x9: speedyd intro dash frame
11,
// 0xa: A'Can logo
12,
// 0xb/0xc: jttlaugh stage 1-3 (particularly on the web scrolling jump platforms)
16,
20,
// 0xd: slghtsag character select
22,
// 0xe/0xf: <unknown>, check me
24,
26
};
uint32_t skip_count = 0;
uint32_t start_word = (m_sprite_base_addr >> 1) + skip_count * 4;
uint32_t end_word = start_word + (m_sprite_count - skip_count) * 4;
@ -836,9 +857,7 @@ void supracan_state::draw_sprites(bitmap_ind16 &bitmap, bitmap_ind8 &maskmap, bi
if ((vram[i + 0] & 0x4000))
{
int xsize = 1 << (vram[i + 1] & 7);
// TODO: this looks non-linear, particularly at bit 3 ON settings
// cfr. A'Can logo, speedyd intro, slghtsag character select
int ysize = ((vram[i + 0] & 0x1e00) >> 9) + 1;
int ysize = ysizes_table[(vram[i + 0] & 0x1e00) >> 9];
// HACK: sonevil sets 1x1 tiles in game, and expecting to take this path.
// Most likely former condition is wrong, and it just "direct sprite" when latter occurs.
@ -865,6 +884,12 @@ void supracan_state::draw_sprites(bitmap_ind16 &bitmap, bitmap_ind8 &maskmap, bi
// I think the xsize must influence the ysize somehow, there are too many conflicting cases otherwise
// there don't appear to be any special markers in the actual looked up tile data to indicate skip / end of list
//if (((vram[i + 0] & 0x1e00) >> 9) == test_target)
//{
// ysize = test_value;
//}
for (int ytile = 0; ytile < ysize; ytile++)
{
for (int xtile = 0; xtile < xsize; xtile++)
@ -895,7 +920,7 @@ void supracan_state::draw_sprites(bitmap_ind16 &bitmap, bitmap_ind8 &maskmap, bi
}
}
// TODO: scaling
// TODO: scaling, find places where it occurs
#if 0
if (xscale == 0) continue;
uint32_t delta = (1 << 17) / xscale;
@ -1074,6 +1099,7 @@ uint32_t supracan_state::screen_update(screen_device &screen, bitmap_ind16 &bitm
{
int which_tilemap_size = get_tilemap_dimensions(xsize, ysize, layer);
bitmap_ind16 &src_bitmap = m_tilemap_sizes[layer][which_tilemap_size]->pixmap();
// TODO: per-tile priority, thru ->flagsmap()
int gfx_region = get_tilemap_region(layer);
int transmask = 0xff;