Game-Decompilation/mzm
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Match ApplySmoothMonochromeToPalette

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y.demaisonregne 2023-05-29 23:03:47 +02:00
parent 2a7c94c3b7
commit ba2a61acfa
2 changed files with 56 additions and 34 deletions
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2
README.md
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@ -2,7 +2,7 @@
This is a work in progress decompilation of Metroid - Zero Mission.
2581/2721 functions decompiled (94.85%, 140 left)
2582/2721 functions decompiled (94.89%, 139 left)
0x35075f/0x76b014 bytes of data not in blobs (44.68%, 0x41a8b5 left)

88
src/color_effects.c
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@ -274,60 +274,82 @@ void ApplyMonochromeToPalette(const u16* src, u16* dst, i8 additionalValue)
}
}
/**
* @brief 5b68c | d8 | Applies a smooth transition of a palette to its monochrome variant (created with ApplyMonochromeToPalette)
*
* @param srcBase Base palette pointer
* @param srcMonochrome Monochrome palette pointer
* @param dst Destination address
* @param stage Stage
*/
void ApplySmoothMonochromeToPalette(u16* srcBase, u16* srcMonochrome, u16* dst, u8 stage)
{
// https://decomp.me/scratch/0RCjq
i32 i;
i32 color;
i32 colorMono;
u16 monoR;
u16 monoG;
u16 monoB;
i32 colorBase;
u16 baseR;
u16 baseG;
u16 baseB;
u8 baseR;
u8 baseG;
u8 baseB;
u8 newR;
u8 newG;
u8 newB;
if (stage == 0)
DMATransfer(3, srcBase, dst, 0x200, 0x10);
else if (stage >= 0x1F)
DMATransfer(3, srcMonochrome, dst, 0x200, 0x10);
else
{
i = 0;
while (i <= UCHAR_MAX)
{
colorMono = *srcMonochrome;
monoR = RED(colorMono);
colorMono >>= 5;
monoG = colorMono & COLOR_MASK;
colorMono >>= 5;
monoB = colorMono & COLOR_MASK;
// Optimization, no calculations needed
DMATransfer(3, srcBase, dst, 0x200, 0x10);
return;
}
colorBase = *srcBase;
baseR = RED(colorBase);
colorBase >>= 5;
baseG = colorBase & COLOR_MASK;
colorBase >>= 5;
baseB = colorBase & COLOR_MASK;
if (stage >= 0x1F)
{
// Transition is done, simply use the monochrome
DMATransfer(3, srcMonochrome, dst, 0x200, 0x10);
return;
}
i = 0;
while (i <= UCHAR_MAX)
{
// Get monochrome components
color = *srcMonochrome;
monoR = RED(color);
color >>= 5;
monoG = RED(color);
color >>= 5;
monoB = RED(color);
newR = (stage * (monoR - baseR) / 32);
newG = (stage * (monoG - baseG) / 32);
newB = (stage * (monoB - baseB) / 32);
// Get normal components
color = *srcBase;
baseR = RED(color);
color >>= 5;
baseG = RED(color);
color >>= 5;
baseB = RED(color);
*dst = COLOR(newR, newG, newB);
// Lerp the difference with the stage, clamp to max color value
color = (monoR - baseR) * stage / (COLOR_MASK + 1);
baseR += color;
color = (monoG - baseG) * stage / (COLOR_MASK + 1);
baseG += color;
color = (monoB - baseB) * stage / (COLOR_MASK + 1);
baseB += color;
i++;
srcBase++;
dst++;
srcMonochrome++;
}
// Create color
*dst = COLOR(baseR, baseG, baseB);
i++;
srcBase++;
dst++;
srcMonochrome++;
}
}