diff options
Diffstat (limited to 'src/GPU2D.cpp')
| -rw-r--r-- | src/GPU2D.cpp | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/src/GPU2D.cpp b/src/GPU2D.cpp index 4951404..f7e834d 100644 --- a/src/GPU2D.cpp +++ b/src/GPU2D.cpp @@ -273,6 +273,8 @@ u32 GPU2D::Read32(u32 addr) void GPU2D::Write8(u32 addr, u8 val) { + if (!Enabled) return; + switch (addr & 0x00000FFF) { case 0x000: DispCnt = (DispCnt & 0xFFFFFF00) | val; return; @@ -353,6 +355,8 @@ void GPU2D::Write8(u32 addr, u8 val) void GPU2D::Write16(u32 addr, u16 val) { + if (!Enabled) return; + switch (addr & 0x00000FFF) { case 0x000: DispCnt = (DispCnt & 0xFFFF0000) | val; return; @@ -482,6 +486,8 @@ void GPU2D::Write16(u32 addr, u16 val) void GPU2D::Write32(u32 addr, u32 val) { + if (!Enabled) return; + switch (addr & 0x00000FFF) { case 0x000: @@ -542,19 +548,21 @@ void GPU2D::DrawScanline(u32 line) line = GPU::VCount; + bool forceblank = false; + // scanlines that end up outside of the GPU drawing range // (as a result of writing to VCount) are filled white - if (line > 192) - { - for (int i = 0; i < 256; i++) - dst[i] = 0xFFFFFFFF; + if (line > 192) forceblank = true; - return; - } + // GPU B can be completely disabled by POWCNT1 + // oddly that's not the case for GPU A + if (Num && !Enabled) forceblank = true; // forced blank // (checkme: are there still things that can run under this mode? likely not) - if (DispCnt & (1<<7)) + if (DispCnt & (1<<7)) forceblank = true; + + if (forceblank) { for (int i = 0; i < 256; i++) dst[i] = 0xFFFFFFFF; |