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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).
* 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).
* A shadow effect (used in level 1) is not implemented.
* ACE Chip aren't fully emulated.
Sprite Priority Notes:

16
src/mame/video/boogwing.cpp
View File

@ -14,6 +14,15 @@ void boogwing_state::video_start()
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..
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 (((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);
}
}
}
}