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master brightness

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This commit is contained in:
StapleButter
2017-03-01 20:23:41 +01:00
parent bc335e31cb
commit c4d9d27e6e
4 changed files with 56 additions and 6 deletions
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48
GPU2D.cpp
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@ -83,6 +83,8 @@ void GPU2D::Reset()
memset(BGRotC, 0, 2*2);
memset(BGRotD, 0, 2*2);
MasterBrightness = 0;
BGExtPalStatus[0] = 0;
BGExtPalStatus[1] = 0;
BGExtPalStatus[2] = 0;
@ -170,6 +172,8 @@ void GPU2D::Write16(u32 addr, u16 val)
case 0x032: BGRotB[1] = val; return;
case 0x034: BGRotC[1] = val; return;
case 0x036: BGRotD[1] = val; return;
case 0x06C: MasterBrightness = val; return;
}
//printf("unknown GPU write16 %08X %04X\n", addr, val);
@ -265,6 +269,50 @@ void GPU2D::DrawScanline(u32 line)
break;
}
// master brightness
if ((MasterBrightness >> 14) == 1)
{
// up
u32 factor = MasterBrightness & 0x1F;
if (factor > 16) factor = 16;
for (int i = 0; i < 256; i++)
{
u32 val = dst[i];
u32 r = val & 0x00003F;
u32 g = val & 0x003F00;
u32 b = val & 0x3F0000;
r += (((0x00003F - r) * factor) >> 4);
g += ((((0x003F00 - g) * factor) >> 4) & 0x003F00);
b += ((((0x3F0000 - b) * factor) >> 4) & 0x3F0000);
dst[i] = r | g | b;
}
}
else if ((MasterBrightness >> 14) == 2)
{
// down
u32 factor = MasterBrightness & 0x1F;
if (factor > 16) factor = 16;
for (int i = 0; i < 256; i++)
{
u32 val = dst[i];
u32 r = val & 0x00003F;
u32 g = val & 0x003F00;
u32 b = val & 0x3F0000;
r -= ((r * factor) >> 4);
g -= (((g * factor) >> 4) & 0x003F00);
b -= (((b * factor) >> 4) & 0x3F0000);
dst[i] = r | g | b;
}
}
// convert to 32-bit RGBA
for (int i = 0; i < 256; i++)
dst[i] = ((dst[i] & 0x003F3F3F) << 2) |