diff options
Diffstat (limited to 'GPU2D.cpp')
| -rw-r--r-- | GPU2D.cpp | 48 |
1 files changed, 48 insertions, 0 deletions
@@ -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) | |