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boogwing.cpp: fix 1st boss shadow effect [Angelo Salese]

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This commit is contained in:
angelosa 2020-03-20 21:26:49 +01:00
parent 82bc3311e8
commit 2b544e3450
2 changed files with 15 additions and 2 deletions
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1
src/mame/drivers/boogwing.cpp
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@ -60,7 +60,6 @@
(Addendum - all known issues seem to be correct - see Sprite Priority Notes below). (Addendum - all known issues seem to be correct - see Sprite Priority Notes below).
* There may be some kind of fullscreen palette effect (controlled by bit 3 in priority * There may be some kind of fullscreen palette effect (controlled by bit 3 in priority
word - used at end of each level, and on final boss). word - used at end of each level, and on final boss).
* A shadow effect (used in level 1) is not implemented.
* ACE Chip aren't fully emulated. * ACE Chip aren't fully emulated.
Sprite Priority Notes: Sprite Priority Notes:

16
src/mame/video/boogwing.cpp
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@ -14,6 +14,15 @@ void boogwing_state::video_start()
save_item(NAME(m_priority)); save_item(NAME(m_priority));
} }
constexpr u32 sub_blend_r32(u32 d, u32 s, u8 level)
{
// stage 1 boss for ragtime, inverts source layer for a shadow effect,
// >> 9 instead of >> 8 is a guess
s^=0xffffff;
return ((((s & 0x0000ff) * level + (d & 0x0000ff) * int(256 - level)) >> 9)) |
((((s & 0x00ff00) * level + (d & 0x00ff00) * int(256 - level)) >> 9) & 0x00ff00) |
((((s & 0xff0000) * level + (d & 0xff0000) * int(256 - level)) >> 9) & 0xff0000);
}
/* Mix the 2 sprite planes with the already rendered tilemaps.. /* Mix the 2 sprite planes with the already rendered tilemaps..
note, if we implement tilemap blending etc. too we'll probably have to mix those in here as well.. note, if we implement tilemap blending etc. too we'll probably have to mix those in here as well..
@ -239,7 +248,12 @@ void boogwing_state::mix_boogwing(screen_device &screen, bitmap_rgb32 &bitmap, c
if ((bg2_drawed) || ((sprite1_drawed && (~drawnpixe1 & 2)) || (sprite2_drawed && (~drawnpixe1 & 1)) || (sprite1_drawed && sprite2_drawed))) if ((bg2_drawed) || ((sprite1_drawed && (~drawnpixe1 & 2)) || (sprite2_drawed && (~drawnpixe1 & 1)) || (sprite1_drawed && sprite2_drawed)))
{ {
if (((pix2 & 0x900) != 0x900) || ((spri2 <= spri1) && sprite1_drawed)) if (((pix2 & 0x900) != 0x900) || ((spri2 <= spri1) && sprite1_drawed))
dstline[x] = alpha_blend_r32(dstline[x], paldata[((drawnpixe1 & 3) ? calculated_coloffs : 0) | pix3], alpha3); {
// TODO: make it functional, check out modes 0x21 and 0x1000.
dstline[x] = (m_deco_ace->get_aceram(0x1f) == 0x22) ?
sub_blend_r32(dstline[x], paldata[((drawnpixe1 & 3) ? calculated_coloffs : 0) | pix3], alpha3) :
alpha_blend_r32(dstline[x], paldata[((drawnpixe1 & 3) ? calculated_coloffs : 0) | pix3], alpha3);
}
} }
} }
} }