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implement proper support for POWCNT1.

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fixes #260
This commit is contained in:
StapleButter
2018-12-18 17:04:42 +01:00
parent 1b64e87115
commit dd30b417b8
8 changed files with 140 additions and 50 deletions
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22
src/GPU2D.cpp
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@ -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;