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cps3.cpp: replaced color DMA fading algo, expected to be hardware-accurate

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This commit is contained in:
MetalliC 2019-09-20 18:40:27 +03:00
parent 9afcd9c9b9
commit 221c040ec2
1 changed files with 3 additions and 9 deletions
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12
src/mame/drivers/cps3.cpp
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@ -937,16 +937,12 @@ static const gfx_layout cps3_tiles8x8_layout =
static inline u8 get_fade(int c, int f)
{
// bit 7 unknown
// bit 7 unused, explicit masked out
// bit 6 fade enable / disable
// bit 5 fade mode
// bit 5 fade mode (1 = invert input values and output)
// bit 4-0 fade value
if (f & 0x40) // Fading enable / disable
{
f &= 0x3f;
c = (f & 0x20) ? (c + (((0x1f - c) * (f & 0x1f)) / 0x1f)) : ((c * f) / 0x1f);
c = std::max(0, std::min(0x1f, c));
}
c = (f & 0x20) ? ((((c ^ 0x1f) * (~f & 0x1f)) >> 5) ^ 0x1f) : (c * (f & 0x1f) >> 5);
return c;
}
@ -959,8 +955,6 @@ void cps3_state::set_mame_colours(int colournum, u16 data, u32 fadeval)
/* is this 100% correct? */
if (fadeval & 0x40400040)
{
//logerror("fadeval %08x\n",fadeval);
r = get_fade(r, (fadeval & 0x7f000000)>>24);
g = get_fade(g, (fadeval & 0x007f0000)>>16);
b = get_fade(b, (fadeval & 0x0000007f)>>0);