diff options
Diffstat (limited to 'src/GPU.cpp')
| -rw-r--r-- | src/GPU.cpp | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/src/GPU.cpp b/src/GPU.cpp index aba97a5..ba04c84 100644 --- a/src/GPU.cpp +++ b/src/GPU.cpp @@ -650,9 +650,23 @@ void MapVRAM_I(u32 bank, u8 cnt) } -void DisplaySwap(u32 val) +void SetPowerCnt(u32 val) { - if (val) + // POWCNT1 effects: + // * bit0: asplodes hardware??? not tested. + // * bit1: disables engine A palette and OAM (zero-filled) (TODO: affects mem timings???) + // * bit2: disables rendering engine, resets its internal state (polygons and registers) + // * bit3: disables geometry engine + // * bit9: disables engine B palette, OAM and rendering (screen turns white) + // * bit15: screen swap + + if (!(val & (1<<0))) printf("!!! CLEARING POWCNT BIT0. DANGER\n"); + + GPU2D_A->SetEnabled(val & (1<<1)); + GPU2D_B->SetEnabled(val & (1<<9)); + GPU3D::SetEnabled(val & (1<<3), val & (1<<2)); + + if (val & (1<<15)) { GPU2D_A->SetFramebuffer(&Framebuffer[256*0]); GPU2D_B->SetFramebuffer(&Framebuffer[256*192]); @@ -838,6 +852,7 @@ void SetVCount(u16 val) // VCount write is delayed until the next scanline // TODO: how does the 3D engine react to VCount writes while it's rendering? + // 3D engine seems to give up on the current frame in that situation, repeating the last two scanlines // TODO: also check the various DMA types that can be involved NextVCount = val; |