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GPU.cpp
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GPU.cpp
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/*
Copyright 2016-2024 melonDS team
This file is part of melonDS.
melonDS is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with melonDS. If not, see http://www.gnu.org/licenses/.
*/
#include <string.h>
#include "NDS.h"
#include "GPU.h"
#include "ARMJIT.h"
#include "GPU2D_Soft.h"
#include "GPU3D.h"
namespace melonDS
{
using Platform::Log;
using Platform::LogLevel;
#define LINE_CYCLES (355*6)
#define HBLANK_CYCLES (48+(256*6))
#define FRAME_CYCLES (LINE_CYCLES * 263)
enum
{
LCD_StartHBlank = 0,
LCD_StartScanline,
LCD_FinishFrame,
};
/*
VRAM invalidation tracking
- we want to know when a VRAM region used for graphics changed
- for some regions unmapping is mandatory to modify them (Texture, TexPal and ExtPal) and
we don't want to completely invalidate them every time they're unmapped and remapped
For this reason we don't track the dirtyness per mapping region, but instead per VRAM bank
with VRAMDirty.
This is more or less a description of VRAMTrackingSet::DeriveState
Each time before the memory is read two things could have happened
to each 16kb piece (16kb is the smallest unit in which mappings can
be made thus also the size VRAMMap_* use):
- this piece was remapped compared to last time we checked,
which means this location in memory is invalid.
- this piece wasn't remapped, which means we need to check whether
it was changed. This can be archived by checking VRAMDirty.
VRAMDirty need to be reset for the respective VRAM bank.
*/
GPU::GPU(melonDS::NDS& nds, std::unique_ptr<Renderer3D>&& renderer3d, std::unique_ptr<GPU2D::Renderer2D>&& renderer2d) noexcept :
NDS(nds),
GPU2D_A(0, *this),
GPU2D_B(1, *this),
GPU3D(nds, renderer3d ? std::move(renderer3d) : std::make_unique<SoftRenderer>()),
GPU2D_Renderer(renderer2d ? std::move(renderer2d) : std::make_unique<GPU2D::SoftRenderer>(*this))
{
NDS.RegisterEventFuncs(Event_LCD, this,
{
MakeEventThunk(GPU, StartHBlank),
MakeEventThunk(GPU, StartScanline),
MakeEventThunk(GPU, FinishFrame)
});
NDS.RegisterEventFuncs(Event_DisplayFIFO, this, {MakeEventThunk(GPU, DisplayFIFO)});
InitFramebuffers();
}
GPU::~GPU() noexcept
{
// All unique_ptr fields are automatically cleaned up
NDS.UnregisterEventFuncs(Event_LCD);
NDS.UnregisterEventFuncs(Event_DisplayFIFO);
}
void GPU::ResetVRAMCache() noexcept
{
for (int i = 0; i < 9; i++)
VRAMDirty[i] = NonStupidBitField<128*1024/VRAMDirtyGranularity>();
VRAMDirty_ABG.Reset();
VRAMDirty_BBG.Reset();
VRAMDirty_AOBJ.Reset();
VRAMDirty_BOBJ.Reset();
VRAMDirty_ABGExtPal.Reset();
VRAMDirty_BBGExtPal.Reset();
VRAMDirty_AOBJExtPal.Reset();
VRAMDirty_BOBJExtPal.Reset();
VRAMDirty_Texture.Reset();
VRAMDirty_TexPal.Reset();
memset(VRAMFlat_ABG, 0, sizeof(VRAMFlat_ABG));
memset(VRAMFlat_BBG, 0, sizeof(VRAMFlat_BBG));
memset(VRAMFlat_AOBJ, 0, sizeof(VRAMFlat_AOBJ));
memset(VRAMFlat_BOBJ, 0, sizeof(VRAMFlat_BOBJ));
memset(VRAMFlat_ABGExtPal, 0, sizeof(VRAMFlat_ABGExtPal));
memset(VRAMFlat_BBGExtPal, 0, sizeof(VRAMFlat_BBGExtPal));
memset(VRAMFlat_AOBJExtPal, 0, sizeof(VRAMFlat_AOBJExtPal));
memset(VRAMFlat_BOBJExtPal, 0, sizeof(VRAMFlat_BOBJExtPal));
memset(VRAMFlat_Texture, 0, sizeof(VRAMFlat_Texture));
memset(VRAMFlat_TexPal, 0, sizeof(VRAMFlat_TexPal));
}
void GPU::Reset() noexcept
{
VCount = 0;
NextVCount = -1;
TotalScanlines = 0;
DispStat[0] = 0;
DispStat[1] = 0;
VMatch[0] = 0;
VMatch[1] = 0;
memset(Palette, 0, 2*1024);
memset(OAM, 0, 2*1024);
memset(VRAM_A, 0, 128*1024);
memset(VRAM_B, 0, 128*1024);
memset(VRAM_C, 0, 128*1024);
memset(VRAM_D, 0, 128*1024);
memset(VRAM_E, 0, 64*1024);
memset(VRAM_F, 0, 16*1024);
memset(VRAM_G, 0, 16*1024);
memset(VRAM_H, 0, 32*1024);
memset(VRAM_I, 0, 16*1024);
memset(VRAMCNT, 0, 9);
VRAMSTAT = 0;
VRAMMap_LCDC = 0;
memset(VRAMMap_ABG, 0, sizeof(VRAMMap_ABG));
memset(VRAMMap_AOBJ, 0, sizeof(VRAMMap_AOBJ));
memset(VRAMMap_BBG, 0, sizeof(VRAMMap_BBG));
memset(VRAMMap_BOBJ, 0, sizeof(VRAMMap_BOBJ));
memset(VRAMMap_ABGExtPal, 0, sizeof(VRAMMap_ABGExtPal));
VRAMMap_AOBJExtPal = 0;
memset(VRAMMap_BBGExtPal, 0, sizeof(VRAMMap_BBGExtPal));
VRAMMap_BOBJExtPal = 0;
memset(VRAMMap_Texture, 0, sizeof(VRAMMap_Texture));
memset(VRAMMap_TexPal, 0, sizeof(VRAMMap_TexPal));
VRAMMap_ARM7[0] = 0;
VRAMMap_ARM7[1] = 0;
memset(VRAMPtr_ABG, 0, sizeof(VRAMPtr_ABG));
memset(VRAMPtr_AOBJ, 0, sizeof(VRAMPtr_AOBJ));
memset(VRAMPtr_BBG, 0, sizeof(VRAMPtr_BBG));
memset(VRAMPtr_BOBJ, 0, sizeof(VRAMPtr_BOBJ));
size_t fbsize;
if (GPU3D.IsRendererAccelerated())
fbsize = (256*3 + 1) * 192;
else
fbsize = 256 * 192;
for (size_t i = 0; i < fbsize; i++)
{
Framebuffer[0][0][i] = 0xFFFFFFFF;
Framebuffer[1][0][i] = 0xFFFFFFFF;
}
for (size_t i = 0; i < fbsize; i++)
{
Framebuffer[0][1][i] = 0xFFFFFFFF;
Framebuffer[1][1][i] = 0xFFFFFFFF;
}
GPU2D_A.Reset();
GPU2D_B.Reset();
GPU3D.Reset();
int backbuf = FrontBuffer ? 0 : 1;
GPU2D_Renderer->SetFramebuffer(Framebuffer[backbuf][1].get(), Framebuffer[backbuf][0].get());
ResetVRAMCache();
OAMDirty = 0x3;
PaletteDirty = 0xF;
}
void GPU::Stop() noexcept
{
int fbsize;
if (GPU3D.IsRendererAccelerated())
fbsize = (256*3 + 1) * 192;
else
fbsize = 256 * 192;
memset(Framebuffer[0][0].get(), 0, fbsize*4);
memset(Framebuffer[0][1].get(), 0, fbsize*4);
memset(Framebuffer[1][0].get(), 0, fbsize*4);
memset(Framebuffer[1][1].get(), 0, fbsize*4);
GPU3D.Stop(*this);
}
void GPU::DoSavestate(Savestate* file) noexcept
{
file->Section("GPUG");
file->Var16(&VCount);
file->Var32(&NextVCount);
file->Var16(&TotalScanlines);
file->Var16(&DispStat[0]);
file->Var16(&DispStat[1]);
file->Var16(&VMatch[0]);
file->Var16(&VMatch[1]);
file->VarArray(Palette, 2*1024);
file->VarArray(OAM, 2*1024);
file->VarArray(VRAM_A, 128*1024);
file->VarArray(VRAM_B, 128*1024);
file->VarArray(VRAM_C, 128*1024);
file->VarArray(VRAM_D, 128*1024);
file->VarArray(VRAM_E, 64*1024);
file->VarArray(VRAM_F, 16*1024);
file->VarArray(VRAM_G, 16*1024);
file->VarArray(VRAM_H, 32*1024);
file->VarArray(VRAM_I, 16*1024);
file->VarArray(VRAMCNT, 9);
file->Var8(&VRAMSTAT);
file->Var32(&VRAMMap_LCDC);
file->VarArray(VRAMMap_ABG, sizeof(VRAMMap_ABG));
file->VarArray(VRAMMap_AOBJ, sizeof(VRAMMap_AOBJ));
file->VarArray(VRAMMap_BBG, sizeof(VRAMMap_BBG));
file->VarArray(VRAMMap_BOBJ, sizeof(VRAMMap_BOBJ));
file->VarArray(VRAMMap_ABGExtPal, sizeof(VRAMMap_ABGExtPal));
file->Var32(&VRAMMap_AOBJExtPal);
file->VarArray(VRAMMap_BBGExtPal, sizeof(VRAMMap_BBGExtPal));
file->Var32(&VRAMMap_BOBJExtPal);
file->VarArray(VRAMMap_Texture, sizeof(VRAMMap_Texture));
file->VarArray(VRAMMap_TexPal, sizeof(VRAMMap_TexPal));
file->Var32(&VRAMMap_ARM7[0]);
file->Var32(&VRAMMap_ARM7[1]);
if (!file->Saving)
{
for (int i = 0; i < 0x20; i++)
VRAMPtr_ABG[i] = GetUniqueBankPtr(VRAMMap_ABG[i], i << 14);
for (int i = 0; i < 0x10; i++)
VRAMPtr_AOBJ[i] = GetUniqueBankPtr(VRAMMap_AOBJ[i], i << 14);
for (int i = 0; i < 0x8; i++)
VRAMPtr_BBG[i] = GetUniqueBankPtr(VRAMMap_BBG[i], i << 14);
for (int i = 0; i < 0x8; i++)
VRAMPtr_BOBJ[i] = GetUniqueBankPtr(VRAMMap_BOBJ[i], i << 14);
}
GPU2D_A.DoSavestate(file);
GPU2D_B.DoSavestate(file);
GPU3D.DoSavestate(file);
if (!file->Saving)
ResetVRAMCache();
}
void GPU::AssignFramebuffers() noexcept
{
int backbuf = FrontBuffer ? 0 : 1;
if (NDS.PowerControl9 & (1<<15))
{
GPU2D_Renderer->SetFramebuffer(Framebuffer[backbuf][0].get(), Framebuffer[backbuf][1].get());
}
else
{
GPU2D_Renderer->SetFramebuffer(Framebuffer[backbuf][1].get(), Framebuffer[backbuf][0].get());
}
}
void GPU::SetRenderer3D(std::unique_ptr<Renderer3D>&& renderer) noexcept
{
if (renderer == nullptr)
GPU3D.SetCurrentRenderer(std::make_unique<SoftRenderer>());
else
GPU3D.SetCurrentRenderer(std::move(renderer));
InitFramebuffers();
}
void GPU::InitFramebuffers() noexcept
{
int fbsize;
if (GPU3D.IsRendererAccelerated())
fbsize = (256*3 + 1) * 192;
else
fbsize = 256 * 192;
Framebuffer[0][0] = std::make_unique<u32[]>(fbsize);
Framebuffer[1][0] = std::make_unique<u32[]>(fbsize);
Framebuffer[0][1] = std::make_unique<u32[]>(fbsize);
Framebuffer[1][1] = std::make_unique<u32[]>(fbsize);
memset(Framebuffer[0][0].get(), 0, fbsize*4);
memset(Framebuffer[1][0].get(), 0, fbsize*4);
memset(Framebuffer[0][1].get(), 0, fbsize*4);
memset(Framebuffer[1][1].get(), 0, fbsize*4);
AssignFramebuffers();
}
// VRAM mapping notes
//
// mirroring:
// unmapped range reads zero
// LCD is mirrored every 0x100000 bytes, the gap between each mirror reads zero
// ABG:
// bank A,B,C,D,E mirror every 0x80000 bytes
// bank F,G mirror at base+0x8000, mirror every 0x80000 bytes
// AOBJ:
// bank A,B,E mirror every 0x40000 bytes
// bank F,G mirror at base+0x8000, mirror every 0x40000 bytes
// BBG:
// bank C mirrors every 0x20000 bytes
// bank H mirrors every 0x10000 bytes
// bank I mirrors at base+0x4000, mirrors every 0x10000 bytes
// BOBJ:
// bank D mirrors every 0x20000 bytes
// bank I mirrors every 0x4000 bytes
//
// untested:
// ARM7 (TODO)
// extended palette (mirroring doesn't apply)
// texture/texpal (does mirroring apply?)
// -> trying to use extpal/texture/texpal with no VRAM mapped.
// would likely read all black, but has to be tested.
//
// overlap:
// when reading: values are read from each bank and ORed together
// when writing: value is written to each bank
u8* GPU::GetUniqueBankPtr(u32 mask, u32 offset) noexcept
{
if (!mask || (mask & (mask - 1)) != 0) return NULL;
int num = __builtin_ctz(mask);
return &VRAM[num][offset & VRAMMask[num]];
}
const u8* GPU::GetUniqueBankPtr(u32 mask, u32 offset) const noexcept
{
if (!mask || (mask & (mask - 1)) != 0) return NULL;
int num = __builtin_ctz(mask);
return &VRAM[num][offset & VRAMMask[num]];
}
#define MAP_RANGE(map, base, n) for (int i = 0; i < n; i++) VRAMMap_##map[(base)+i] |= bankmask;
#define UNMAP_RANGE(map, base, n) for (int i = 0; i < n; i++) VRAMMap_##map[(base)+i] &= ~bankmask;
#define MAP_RANGE_PTR(map, base, n) \
for (int i = 0; i < n; i++) { VRAMMap_##map[(base)+i] |= bankmask; VRAMPtr_##map[(base)+i] = GetUniqueBankPtr(VRAMMap_##map[(base)+i], ((base)+i)<<14); }
#define UNMAP_RANGE_PTR(map, base, n) \
for (int i = 0; i < n; i++) { VRAMMap_##map[(base)+i] &= ~bankmask; VRAMPtr_##map[(base)+i] = GetUniqueBankPtr(VRAMMap_##map[(base)+i], ((base)+i)<<14); }
void GPU::MapVRAM_AB(u32 bank, u8 cnt) noexcept
{
cnt &= 0x9B;
u8 oldcnt = VRAMCNT[bank];
VRAMCNT[bank] = cnt;
if (oldcnt == cnt) return;
u8 oldofs = (oldcnt >> 3) & 0x3;
u8 ofs = (cnt >> 3) & 0x3;
u32 bankmask = 1 << bank;
if (oldcnt & (1<<7))
{
switch (oldcnt & 0x3)
{
case 0: // LCDC
VRAMMap_LCDC &= ~bankmask;
break;
case 1: // ABG
UNMAP_RANGE_PTR(ABG, oldofs<<3, 8);
break;
case 2: // AOBJ
oldofs &= 0x1;
UNMAP_RANGE_PTR(AOBJ, oldofs<<3, 8);
break;
case 3: // texture
VRAMMap_Texture[oldofs] &= ~bankmask;
break;
}
}
if (cnt & (1<<7))
{
switch (cnt & 0x3)
{
case 0: // LCDC
VRAMMap_LCDC |= bankmask;
break;
case 1: // ABG
MAP_RANGE_PTR(ABG, ofs<<3, 8);
break;
case 2: // AOBJ
ofs &= 0x1;
MAP_RANGE_PTR(AOBJ, ofs<<3, 8);
break;
case 3: // texture
VRAMMap_Texture[ofs] |= bankmask;
break;
}
}
}
void GPU::MapVRAM_CD(u32 bank, u8 cnt) noexcept
{
cnt &= 0x9F;
u8 oldcnt = VRAMCNT[bank];
VRAMCNT[bank] = cnt;
VRAMSTAT &= ~(1 << (bank-2));
if (oldcnt == cnt) return;
u8 oldofs = (oldcnt >> 3) & 0x7;
u8 ofs = (cnt >> 3) & 0x7;
u32 bankmask = 1 << bank;
if (oldcnt & (1<<7))
{
switch (oldcnt & 0x7)
{
case 0: // LCDC
VRAMMap_LCDC &= ~bankmask;
break;
case 1: // ABG
UNMAP_RANGE_PTR(ABG, oldofs<<3, 8);
break;
case 2: // ARM7 VRAM
oldofs &= 0x1;
VRAMMap_ARM7[oldofs] &= ~bankmask;
break;
case 3: // texture
VRAMMap_Texture[oldofs] &= ~bankmask;
break;
case 4: // BBG/BOBJ
if (bank == 2)
{
UNMAP_RANGE_PTR(BBG, 0, 8);
}
else
{
UNMAP_RANGE_PTR(BOBJ, 0, 8);
}
break;
}
}
if (cnt & (1<<7))
{
switch (cnt & 0x7)
{
case 0: // LCDC
VRAMMap_LCDC |= bankmask;
break;
case 1: // ABG
MAP_RANGE_PTR(ABG, ofs<<3, 8);
break;
case 2: // ARM7 VRAM
ofs &= 0x1;
VRAMMap_ARM7[ofs] |= bankmask;
memset(VRAMDirty[bank].Data, 0xFF, sizeof(VRAMDirty[bank].Data));
VRAMSTAT |= (1 << (bank-2));
NDS.JIT.CheckAndInvalidateWVRAM(ofs);
break;
case 3: // texture
VRAMMap_Texture[ofs] |= bankmask;
break;
case 4: // BBG/BOBJ
if (bank == 2)
{
MAP_RANGE_PTR(BBG, 0, 8);
}
else
{
MAP_RANGE_PTR(BOBJ, 0, 8);
}
break;
}
}
}
void GPU::MapVRAM_E(u32 bank, u8 cnt) noexcept
{
cnt &= 0x87;
u8 oldcnt = VRAMCNT[bank];
VRAMCNT[bank] = cnt;
if (oldcnt == cnt) return;
u32 bankmask = 1 << bank;
if (oldcnt & (1<<7))
{
switch (oldcnt & 0x7)
{
case 0: // LCDC
VRAMMap_LCDC &= ~bankmask;
break;
case 1: // ABG
UNMAP_RANGE_PTR(ABG, 0, 4);
break;
case 2: // AOBJ
UNMAP_RANGE_PTR(AOBJ, 0, 4);
break;
case 3: // texture palette
UNMAP_RANGE(TexPal, 0, 4);
break;
case 4: // ABG ext palette
UNMAP_RANGE(ABGExtPal, 0, 4);
break;
}
}
if (cnt & (1<<7))
{
switch (cnt & 0x7)
{
case 0: // LCDC
VRAMMap_LCDC |= bankmask;
break;
case 1: // ABG
MAP_RANGE_PTR(ABG, 0, 4);
break;
case 2: // AOBJ
MAP_RANGE_PTR(AOBJ, 0, 4);
break;
case 3: // texture palette
MAP_RANGE(TexPal, 0, 4);
break;
case 4: // ABG ext palette
MAP_RANGE(ABGExtPal, 0, 4);
break;
}
}
}
void GPU::MapVRAM_FG(u32 bank, u8 cnt) noexcept
{
cnt &= 0x9F;
u8 oldcnt = VRAMCNT[bank];
VRAMCNT[bank] = cnt;
if (oldcnt == cnt) return;
u8 oldofs = (oldcnt >> 3) & 0x7;
u8 ofs = (cnt >> 3) & 0x7;
u32 bankmask = 1 << bank;
if (oldcnt & (1<<7))
{
switch (oldcnt & 0x7)
{
case 0: // LCDC
VRAMMap_LCDC &= ~bankmask;
break;
case 1: // ABG
{
u32 base = (oldofs & 0x1) + ((oldofs & 0x2) << 1);
VRAMMap_ABG[base] &= ~bankmask;
VRAMMap_ABG[base + 2] &= ~bankmask;
VRAMPtr_ABG[base] = GetUniqueBankPtr(VRAMMap_ABG[base], base << 14);
VRAMPtr_ABG[base + 2] = GetUniqueBankPtr(VRAMMap_ABG[base + 2], (base + 2) << 14);
}
break;
case 2: // AOBJ
{
u32 base = (oldofs & 0x1) + ((oldofs & 0x2) << 1);
VRAMMap_AOBJ[base] &= ~bankmask;
VRAMMap_AOBJ[base + 2] &= ~bankmask;
VRAMPtr_AOBJ[base] = GetUniqueBankPtr(VRAMMap_AOBJ[base], base << 14);
VRAMPtr_AOBJ[base + 2] = GetUniqueBankPtr(VRAMMap_AOBJ[base + 2], (base + 2) << 14);
}
break;
case 3: // texture palette
VRAMMap_TexPal[(oldofs & 0x1) + ((oldofs & 0x2) << 1)] &= ~bankmask;
break;
case 4: // ABG ext palette
VRAMMap_ABGExtPal[((oldofs & 0x1) << 1)] &= ~bankmask;
VRAMMap_ABGExtPal[((oldofs & 0x1) << 1) + 1] &= ~bankmask;
break;
case 5: // AOBJ ext palette
VRAMMap_AOBJExtPal &= ~bankmask;
break;
}
}
if (cnt & (1<<7))
{
switch (cnt & 0x7)
{
case 0: // LCDC
VRAMMap_LCDC |= bankmask;
break;
case 1: // ABG
{
u32 base = (ofs & 0x1) + ((ofs & 0x2) << 1);
VRAMMap_ABG[base] |= bankmask;
VRAMMap_ABG[base + 2] |= bankmask;
VRAMPtr_ABG[base] = GetUniqueBankPtr(VRAMMap_ABG[base], base << 14);
VRAMPtr_ABG[base + 2] = GetUniqueBankPtr(VRAMMap_ABG[base + 2], (base + 2) << 14);
}
break;
case 2: // AOBJ
{
u32 base = (ofs & 0x1) + ((ofs & 0x2) << 1);
VRAMMap_AOBJ[base] |= bankmask;
VRAMMap_AOBJ[base + 2] |= bankmask;
VRAMPtr_AOBJ[base] = GetUniqueBankPtr(VRAMMap_AOBJ[base], base << 14);
VRAMPtr_AOBJ[base + 2] = GetUniqueBankPtr(VRAMMap_AOBJ[base + 2], (base + 2) << 14);
}
break;
case 3: // texture palette
VRAMMap_TexPal[(ofs & 0x1) + ((ofs & 0x2) << 1)] |= bankmask;
break;
case 4: // ABG ext palette
VRAMMap_ABGExtPal[((ofs & 0x1) << 1)] |= bankmask;
VRAMMap_ABGExtPal[((ofs & 0x1) << 1) + 1] |= bankmask;
break;
case 5: // AOBJ ext palette
VRAMMap_AOBJExtPal |= bankmask;
break;
}
}
}
void GPU::MapVRAM_H(u32 bank, u8 cnt) noexcept
{
cnt &= 0x83;
u8 oldcnt = VRAMCNT[bank];
VRAMCNT[bank] = cnt;
if (oldcnt == cnt) return;
u32 bankmask = 1 << bank;
if (oldcnt & (1<<7))
{
switch (oldcnt & 0x3)
{
case 0: // LCDC
VRAMMap_LCDC &= ~bankmask;
break;
case 1: // BBG
VRAMMap_BBG[0] &= ~bankmask;
VRAMMap_BBG[1] &= ~bankmask;
VRAMMap_BBG[4] &= ~bankmask;
VRAMMap_BBG[5] &= ~bankmask;
VRAMPtr_BBG[0] = GetUniqueBankPtr(VRAMMap_BBG[0], 0 << 14);
VRAMPtr_BBG[1] = GetUniqueBankPtr(VRAMMap_BBG[1], 1 << 14);
VRAMPtr_BBG[4] = GetUniqueBankPtr(VRAMMap_BBG[4], 4 << 14);
VRAMPtr_BBG[5] = GetUniqueBankPtr(VRAMMap_BBG[5], 5 << 14);
break;
case 2: // BBG ext palette
UNMAP_RANGE(BBGExtPal, 0, 4);
break;
}
}
if (cnt & (1<<7))
{
switch (cnt & 0x3)
{
case 0: // LCDC
VRAMMap_LCDC |= bankmask;
break;
case 1: // BBG
VRAMMap_BBG[0] |= bankmask;
VRAMMap_BBG[1] |= bankmask;
VRAMMap_BBG[4] |= bankmask;
VRAMMap_BBG[5] |= bankmask;
VRAMPtr_BBG[0] = GetUniqueBankPtr(VRAMMap_BBG[0], 0 << 14);
VRAMPtr_BBG[1] = GetUniqueBankPtr(VRAMMap_BBG[1], 1 << 14);
VRAMPtr_BBG[4] = GetUniqueBankPtr(VRAMMap_BBG[4], 4 << 14);
VRAMPtr_BBG[5] = GetUniqueBankPtr(VRAMMap_BBG[5], 5 << 14);
break;
case 2: // BBG ext palette
MAP_RANGE(BBGExtPal, 0, 4);
break;
}
}
}
void GPU::MapVRAM_I(u32 bank, u8 cnt) noexcept
{
cnt &= 0x83;
u8 oldcnt = VRAMCNT[bank];
VRAMCNT[bank] = cnt;
if (oldcnt == cnt) return;
u32 bankmask = 1 << bank;
if (oldcnt & (1<<7))
{
switch (oldcnt & 0x3)
{
case 0: // LCDC
VRAMMap_LCDC &= ~bankmask;
break;
case 1: // BBG
VRAMMap_BBG[2] &= ~bankmask;
VRAMMap_BBG[3] &= ~bankmask;
VRAMMap_BBG[6] &= ~bankmask;
VRAMMap_BBG[7] &= ~bankmask;
VRAMPtr_BBG[2] = GetUniqueBankPtr(VRAMMap_BBG[2], 2 << 14);
VRAMPtr_BBG[3] = GetUniqueBankPtr(VRAMMap_BBG[3], 3 << 14);
VRAMPtr_BBG[6] = GetUniqueBankPtr(VRAMMap_BBG[6], 6 << 14);
VRAMPtr_BBG[7] = GetUniqueBankPtr(VRAMMap_BBG[7], 7 << 14);
break;
case 2: // BOBJ
UNMAP_RANGE_PTR(BOBJ, 0, 8);
break;
case 3: // BOBJ ext palette
VRAMMap_BOBJExtPal &= ~bankmask;
break;
}
}
if (cnt & (1<<7))
{
switch (cnt & 0x3)
{
case 0: // LCDC
VRAMMap_LCDC |= bankmask;
break;
case 1: // BBG
VRAMMap_BBG[2] |= bankmask;
VRAMMap_BBG[3] |= bankmask;
VRAMMap_BBG[6] |= bankmask;
VRAMMap_BBG[7] |= bankmask;
VRAMPtr_BBG[2] = GetUniqueBankPtr(VRAMMap_BBG[2], 2 << 14);
VRAMPtr_BBG[3] = GetUniqueBankPtr(VRAMMap_BBG[3], 3 << 14);
VRAMPtr_BBG[6] = GetUniqueBankPtr(VRAMMap_BBG[6], 6 << 14);
VRAMPtr_BBG[7] = GetUniqueBankPtr(VRAMMap_BBG[7], 7 << 14);
break;
case 2: // BOBJ
MAP_RANGE_PTR(BOBJ, 0, 8);
break;
case 3: // BOBJ ext palette
VRAMMap_BOBJExtPal |= bankmask;
break;
}
}
}
void GPU::SetPowerCnt(u32 val) noexcept
{
// 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))) Log(LogLevel::Warn, "!!! 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));
AssignFramebuffers();
}
void GPU::DisplayFIFO(u32 x) noexcept
{
// sample the FIFO
// as this starts 16 cycles (~3 pixels) before display start,
// we aren't aligned to the 8-pixel grid
if (x > 0)
{
if (x == 8)
GPU2D_A.SampleFIFO(0, 5);
else
GPU2D_A.SampleFIFO(x-11, 8);
}
if (x < 256)
{
// transfer the next 8 pixels
NDS.CheckDMAs(0, 0x04);
NDS.ScheduleEvent(Event_DisplayFIFO, true, 6*8, 0, x+8);
}
else
GPU2D_A.SampleFIFO(253, 3); // sample the remaining pixels
}
void GPU::StartFrame() noexcept
{
// only run the display FIFO if needed:
// * if it is used for display or capture
// * if we have display FIFO DMA
RunFIFO = GPU2D_A.UsesFIFO() || NDS.DMAsInMode(0, 0x04);
TotalScanlines = 0;
StartScanline(0);
}
void GPU::StartHBlank(u32 line) noexcept
{
DispStat[0] |= (1<<1);
DispStat[1] |= (1<<1);
if (VCount < 192)
{
// draw
// note: this should start 48 cycles after the scanline start
if (line < 192)
{
GPU2D_Renderer->DrawScanline(line, &GPU2D_A);
GPU2D_Renderer->DrawScanline(line, &GPU2D_B);
}
// sprites are pre-rendered one scanline in advance
if (line < 191)
{
GPU2D_Renderer->DrawSprites(line+1, &GPU2D_A);
GPU2D_Renderer->DrawSprites(line+1, &GPU2D_B);
}
NDS.CheckDMAs(0, 0x02);
}
else if (VCount == 215)
{
GPU3D.VCount215(*this);
}
else if (VCount == 262)
{
GPU2D_Renderer->DrawSprites(0, &GPU2D_A);
GPU2D_Renderer->DrawSprites(0, &GPU2D_B);
}
if (DispStat[0] & (1<<4)) NDS.SetIRQ(0, IRQ_HBlank);
if (DispStat[1] & (1<<4)) NDS.SetIRQ(1, IRQ_HBlank);
if (VCount < 262)
NDS.ScheduleEvent(Event_LCD, true, (LINE_CYCLES - HBLANK_CYCLES), LCD_StartScanline, line+1);
else
NDS.ScheduleEvent(Event_LCD, true, (LINE_CYCLES - HBLANK_CYCLES), LCD_FinishFrame, line+1);
}
void GPU::FinishFrame(u32 lines) noexcept
{
FrontBuffer = FrontBuffer ? 0 : 1;
AssignFramebuffers();
TotalScanlines = lines;
if (GPU3D.AbortFrame)
{
GPU3D.RestartFrame(*this);
GPU3D.AbortFrame = false;
}
}
void GPU::BlankFrame() noexcept
{
int backbuf = FrontBuffer ? 0 : 1;
int fbsize;
if (GPU3D.IsRendererAccelerated())
fbsize = (256*3 + 1) * 192;
else
fbsize = 256 * 192;
memset(Framebuffer[backbuf][0].get(), 0, fbsize*4);
memset(Framebuffer[backbuf][1].get(), 0, fbsize*4);
FrontBuffer = backbuf;
AssignFramebuffers();
TotalScanlines = 263;
}
void GPU::StartScanline(u32 line) noexcept
{
if (line == 0)
VCount = 0;
else if (NextVCount != 0xFFFFFFFF)
VCount = NextVCount;
else
VCount++;
NextVCount = -1;
DispStat[0] &= ~(1<<1);
DispStat[1] &= ~(1<<1);
if (VCount == VMatch[0])
{
DispStat[0] |= (1<<2);
if (DispStat[0] & (1<<5)) NDS.SetIRQ(0, IRQ_VCount);
}
else
DispStat[0] &= ~(1<<2);
if (VCount == VMatch[1])
{
DispStat[1] |= (1<<2);
if (DispStat[1] & (1<<5)) NDS.SetIRQ(1, IRQ_VCount);
}
else
DispStat[1] &= ~(1<<2);
GPU2D_A.CheckWindows(VCount);
GPU2D_B.CheckWindows(VCount);
if (VCount >= 2 && VCount < 194)
NDS.CheckDMAs(0, 0x03);
else if (VCount == 194)
NDS.StopDMAs(0, 0x03);
if (line < 192)
{
if (line == 0)
{
GPU2D_Renderer->VBlankEnd(&GPU2D_A, &GPU2D_B);
GPU2D_A.VBlankEnd();
GPU2D_B.VBlankEnd();
}