piwalker/melonDS
1
0
Fork 0
mirror of https://github.com/melonDS-emu/melonDS.git synced 2024-11-14 21:37:42 -07:00
Code Issues Actions Packages Projects Releases Wiki Activity

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

Browse Source 
fixes #665
This commit is contained in:
Arisotura 2020-08-19 00:46:16 +02:00
parent ba373ca72a
commit 6f4e7c60b2
1 changed files with 43 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

77
src/GPU2D.cpp
View File

@ -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);