Commit 6f4e7c60 authored by Arisotura's avatar Arisotura
Browse files

GPU2D: allow writes to DISPCNT, master brightness, capture, dispFIFO regardless of POWCNT.

fixes #665
parent ba373ca7
......@@ -35,9 +35,6 @@
// * [Gericom] bit15 is used as bottom green bit for palettes. TODO: check where this applies.
// tested on the normal BG palette and applies there
//
// oh also, changing DISPCNT bit16-17 midframe doesn't work (ignored? applied for next frame?)
// TODO, eventually: check whether other DISPCNT bits can be changed midframe
//
// for VRAM display mode, VRAM must be mapped to LCDC
//
// FIFO display mode:
......@@ -78,7 +75,10 @@
// * for rotscaled sprites: coordinates that are inside the sprite are clamped to the sprite region
// after being transformed for mosaic
// TODO: find which parts of DISPCNT are latched. for example, not possible to change video mode midframe.
// TODO: master brightness, display capture and mainmem FIFO are separate circuitry, distinct from
// the tile renderers.
// for example these aren't affected by POWCNT GPU-disable bits.
// to model the hardware more accurately, the relevant logic should be moved to GPU.cpp.
GPU2D::GPU2D(u32 num)
......@@ -309,8 +309,6 @@ u32 GPU2D::Read32(u32 addr)
void GPU2D::Write8(u32 addr, u8 val)
{
if (!Enabled) return;
switch (addr & 0x00000FFF)
{
case 0x000:
......@@ -329,7 +327,12 @@ void GPU2D::Write8(u32 addr, u8 val)
DispCnt = (DispCnt & 0x00FFFFFF) | (val << 24);
if (Num) DispCnt &= 0xC0B1FFF7;
return;
}
if (!Enabled) return;
switch (addr & 0x00000FFF)
{
case 0x008: BGCnt[0] = (BGCnt[0] & 0xFF00) | val; return;
case 0x009: BGCnt[0] = (BGCnt[0] & 0x00FF) | (val << 8); return;
case 0x00A: BGCnt[1] = (BGCnt[1] & 0xFF00) | val; return;
......@@ -405,8 +408,6 @@ void GPU2D::Write8(u32 addr, u8 val)
void GPU2D::Write16(u32 addr, u16 val)
{
if (!Enabled) return;
switch (addr & 0x00000FFF)
{
case 0x000:
......@@ -418,6 +419,22 @@ void GPU2D::Write16(u32 addr, u16 val)
if (Num) DispCnt &= 0xC0B1FFF7;
return;
case 0x068:
DispFIFO[DispFIFOWritePtr] = val;
return;
case 0x06A:
DispFIFO[DispFIFOWritePtr+1] = val;
DispFIFOWritePtr += 2;
DispFIFOWritePtr &= 0xF;
return;
case 0x06C: MasterBrightness = val; return;
}
if (!Enabled) return;
switch (addr & 0x00000FFF)
{
case 0x008: BGCnt[0] = val; return;
case 0x00A: BGCnt[1] = val; return;
case 0x00C: BGCnt[2] = val; return;
......@@ -526,17 +543,6 @@ void GPU2D::Write16(u32 addr, u16 val)
EVY = val & 0x1F;
if (EVY > 16) EVY = 16;
return;
case 0x068:
DispFIFO[DispFIFOWritePtr] = val;
return;
case 0x06A:
DispFIFO[DispFIFOWritePtr+1] = val;
DispFIFOWritePtr += 2;
DispFIFOWritePtr &= 0xF;
return;
case 0x06C: MasterBrightness = val; return;
}
//printf("unknown GPU write16 %08X %04X\n", addr, val);
......@@ -544,8 +550,6 @@ void GPU2D::Write16(u32 addr, u16 val)
void GPU2D::Write32(u32 addr, u32 val)
{
if (!Enabled) return;
switch (addr & 0x00000FFF)
{
case 0x000:
......@@ -553,6 +557,24 @@ void GPU2D::Write32(u32 addr, u32 val)
if (Num) DispCnt &= 0xC0B1FFF7;
return;
case 0x064:
// TODO: check what happens when writing to it during display
// esp. if a capture is happening
CaptureCnt = val & 0xEF3F1F1F;
return;
case 0x068:
DispFIFO[DispFIFOWritePtr] = val & 0xFFFF;
DispFIFO[DispFIFOWritePtr+1] = val >> 16;
DispFIFOWritePtr += 2;
DispFIFOWritePtr &= 0xF;
return;
}
if (!Enabled) return;
switch (addr & 0x00000FFF)
{
case 0x028:
if (val & 0x08000000) val |= 0xF0000000;
BGXRef[0] = val;
......@@ -574,19 +596,6 @@ void GPU2D::Write32(u32 addr, u32 val)
BGYRef[1] = val;
if (GPU::VCount < 192) BGYRefInternal[1] = BGYRef[1];
return;
case 0x064:
// TODO: check what happens when writing to it during display
// esp. if a capture is happening
CaptureCnt = val & 0xEF3F1F1F;
return;
case 0x068:
DispFIFO[DispFIFOWritePtr] = val & 0xFFFF;
DispFIFO[DispFIFOWritePtr+1] = val >> 16;
DispFIFOWritePtr += 2;
DispFIFOWritePtr &= 0xF;
return;
}
Write16(addr, val&0xFFFF);
......
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