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GPU2D.cpp
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GPU2D.cpp
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/*
Copyright 2016-2019 StapleButter
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 <stdio.h>
#include <string.h>
#include "NDS.h"
#include "GPU.h"
// notes on color conversion
//
// * BLDCNT special effects are applied on 18bit colors
// -> layers are converted to 18bit before being composited
// -> 'brightness up' effect does: x = x + (63-x)*factor
// * colors are converted as follows: 18bit = 15bit * 2
// -> white comes out as 62,62,62 and not 63,63,63
// * VRAM/FIFO display modes convert colors the same way
// * 3D engine converts colors differently (18bit = 15bit * 2 + 1, except 0 = 0)
// * 'screen disabled' white is 63,63,63
// * [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:
// * the 'FIFO' is a circular buffer of 32 bytes (16 pixels)
// * the buffer doesn't get empty, the display controller keeps reading from it
// -> if it isn't updated, the contents will be repeated every 16 pixels
// * the write pointer is incremented when writing to the higher 16 bits of the FIFO register (0x04000068)
// * the write pointer is reset upon VBlank
// * FIFO DMA (mode 4) is triggered every 8 pixels. start bit is cleared upon VBlank.
//
// sprite blending rules
// * destination must be selected as 2nd target
// * sprite must be semitransparent or bitmap sprite
// * blending is applied instead of the selected color effect, even if it is 'none'.
// * for bitmap sprites: EVA = alpha+1, EVB = 16-EVA
// * for bitmap sprites: alpha=0 is always transparent, even if blending doesn't apply
//
// 3D blending rules
//
// 3D/3D blending seems to follow these equations:
// dstColor = srcColor*srcAlpha + dstColor*(1-srcAlpha)
// dstAlpha = max(srcAlpha, dstAlpha)
// blending isn't applied if dstAlpha is zero.
//
// 3D/2D blending rules
// * if destination selected as 2nd target:
// blending is applied instead of the selected color effect, using full 5bit alpha from 3D layer
// this even if the selected color effect is 'none'.
// apparently this works even if BG0 isn't selected as 1st target
// * if BG0 is selected as 1st target, destination not selected as 2nd target:
// brightness up/down effect is applied if selected. if blending is selected, it doesn't apply.
// * 3D layer pixels with alpha=0 are always transparent.
//
// mosaic:
// * mosaic grid starts at 0,0 regardless of the BG/sprite position
// * when changing it midframe: new X setting is applied immediately, new Y setting is applied only
// after the end of the current mosaic row
// TODO: find which parts of DISPCNT are latched. for example, not possible to change video mode midframe.
GPU2D::GPU2D(u32 num)
{
Num = num;
}
GPU2D::~GPU2D()
{
}
void GPU2D::Reset()
{
DispCnt = 0;
memset(BGCnt, 0, 4*2);
memset(BGXPos, 0, 4*2);
memset(BGYPos, 0, 4*2);
memset(BGXRef, 0, 2*4);
memset(BGYRef, 0, 2*4);
memset(BGXRefInternal, 0, 2*4);
memset(BGYRefInternal, 0, 2*4);
memset(BGRotA, 0, 2*2);
memset(BGRotB, 0, 2*2);
memset(BGRotC, 0, 2*2);
memset(BGRotD, 0, 2*2);
memset(Win0Coords, 0, 4);
memset(Win1Coords, 0, 4);
memset(WinCnt, 0, 4);
Win0Active = 0;
Win1Active = 0;
BGMosaicSize[0] = 0;
BGMosaicSize[1] = 0;
OBJMosaicSize[0] = 0;
OBJMosaicSize[1] = 0;
BGMosaicY = 0;
BGMosaicYMax = 0;
OBJMosaicY = 0;
OBJMosaicYMax = 0;
BlendCnt = 0;
EVA = 16;
EVB = 0;
EVY = 0;
memset(DispFIFO, 0, 16*2);
DispFIFOReadPtr = 0;
DispFIFOWritePtr = 0;
memset(DispFIFOBuffer, 0, 256*2);
CaptureCnt = 0;
MasterBrightness = 0;
BGExtPalStatus[0] = 0;
BGExtPalStatus[1] = 0;
BGExtPalStatus[2] = 0;
BGExtPalStatus[3] = 0;
OBJExtPalStatus = 0;
}
void GPU2D::DoSavestate(Savestate* file)
{
file->Section((char*)(Num ? "GP2B" : "GP2A"));
file->Var32(&DispCnt);
file->VarArray(BGCnt, 4*2);
file->VarArray(BGXPos, 4*2);
file->VarArray(BGYPos, 4*2);
file->VarArray(BGXRef, 2*4);
file->VarArray(BGYRef, 2*4);
file->VarArray(BGXRefInternal, 2*4);
file->VarArray(BGYRefInternal, 2*4);
file->VarArray(BGRotA, 2*2);
file->VarArray(BGRotB, 2*2);
file->VarArray(BGRotC, 2*2);
file->VarArray(BGRotD, 2*2);
file->VarArray(Win0Coords, 4);
file->VarArray(Win1Coords, 4);
file->VarArray(WinCnt, 4);
file->VarArray(BGMosaicSize, 2);
file->VarArray(OBJMosaicSize, 2);
file->Var8(&BGMosaicY);
file->Var8(&BGMosaicYMax);
file->Var8(&OBJMosaicY);
file->Var8(&OBJMosaicYMax);
file->Var16(&BlendCnt);
file->Var16(&BlendAlpha);
file->Var8(&EVA);
file->Var8(&EVB);
file->Var8(&EVY);
file->Var16(&MasterBrightness);
if (!Num)
{
file->VarArray(DispFIFO, 16*2);
file->Var32(&DispFIFOReadPtr);
file->Var32(&DispFIFOWritePtr);
file->VarArray(DispFIFOBuffer, 256*2);
file->Var32(&CaptureCnt);
}
if (file->IsAtleastVersion(2, 1))
{
file->Var32(&Win0Active);
file->Var32(&Win1Active);
}
else
{
Win0Active = 0;
Win1Active = 0;
}
if (!file->Saving)
{
// refresh those
BGExtPalStatus[0] = 0;
BGExtPalStatus[1] = 0;
BGExtPalStatus[2] = 0;
BGExtPalStatus[3] = 0;
OBJExtPalStatus = 0;
}
}
void GPU2D::SetFramebuffer(u32* buf)
{
Framebuffer = buf;
}
u8 GPU2D::Read8(u32 addr)
{
switch (addr & 0x00000FFF)
{
case 0x048: return WinCnt[0];
case 0x049: return WinCnt[1];
case 0x04A: return WinCnt[2];
case 0x04B: return WinCnt[3];
}
printf("unknown GPU read8 %08X\n", addr);
return 0;
}
u16 GPU2D::Read16(u32 addr)
{
switch (addr & 0x00000FFF)
{
case 0x000: return DispCnt&0xFFFF;
case 0x002: return DispCnt>>16;
case 0x008: return BGCnt[0];
case 0x00A: return BGCnt[1];
case 0x00C: return BGCnt[2];
case 0x00E: return BGCnt[3];
case 0x048: return WinCnt[0] | (WinCnt[1] << 8);
case 0x04A: return WinCnt[2] | (WinCnt[3] << 8);
case 0x050: return BlendCnt;
case 0x052: return BlendAlpha;
// BLDY is write-only
case 0x064: return CaptureCnt & 0xFFFF;
case 0x066: return CaptureCnt >> 16;
case 0x06C: return MasterBrightness;
}
printf("unknown GPU read16 %08X\n", addr);
return 0;
}
u32 GPU2D::Read32(u32 addr)
{
switch (addr & 0x00000FFF)
{
case 0x000: return DispCnt;
case 0x064: return CaptureCnt;
}
return Read16(addr) | (Read16(addr+2) << 16);
}
void GPU2D::Write8(u32 addr, u8 val)
{
switch (addr & 0x00000FFF)
{
case 0x000: DispCnt = (DispCnt & 0xFFFFFF00) | val; return;
case 0x001: DispCnt = (DispCnt & 0xFFFF00FF) | (val << 8); return;
case 0x002: DispCnt = (DispCnt & 0xFF00FFFF) | (val << 16); return;
case 0x003: DispCnt = (DispCnt & 0x00FFFFFF) | (val << 24); return;
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;
case 0x00B: BGCnt[1] = (BGCnt[1] & 0x00FF) | (val << 8); return;
case 0x00C: BGCnt[2] = (BGCnt[2] & 0xFF00) | val; return;
case 0x00D: BGCnt[2] = (BGCnt[2] & 0x00FF) | (val << 8); return;
case 0x00E: BGCnt[3] = (BGCnt[3] & 0xFF00) | val; return;
case 0x00F: BGCnt[3] = (BGCnt[3] & 0x00FF) | (val << 8); return;
case 0x010: BGXPos[0] = (BGXPos[0] & 0xFF00) | val; return;
case 0x011: BGXPos[0] = (BGXPos[0] & 0x00FF) | (val << 8); return;
case 0x012: BGYPos[0] = (BGYPos[0] & 0xFF00) | val; return;
case 0x013: BGYPos[0] = (BGYPos[0] & 0x00FF) | (val << 8); return;
case 0x014: BGXPos[1] = (BGXPos[1] & 0xFF00) | val; return;
case 0x015: BGXPos[1] = (BGXPos[1] & 0x00FF) | (val << 8); return;
case 0x016: BGYPos[1] = (BGYPos[1] & 0xFF00) | val; return;
case 0x017: BGYPos[1] = (BGYPos[1] & 0x00FF) | (val << 8); return;
case 0x018: BGXPos[2] = (BGXPos[2] & 0xFF00) | val; return;
case 0x019: BGXPos[2] = (BGXPos[2] & 0x00FF) | (val << 8); return;
case 0x01A: BGYPos[2] = (BGYPos[2] & 0xFF00) | val; return;
case 0x01B: BGYPos[2] = (BGYPos[2] & 0x00FF) | (val << 8); return;
case 0x01C: BGXPos[3] = (BGXPos[3] & 0xFF00) | val; return;
case 0x01D: BGXPos[3] = (BGXPos[3] & 0x00FF) | (val << 8); return;
case 0x01E: BGYPos[3] = (BGYPos[3] & 0xFF00) | val; return;
case 0x01F: BGYPos[3] = (BGYPos[3] & 0x00FF) | (val << 8); return;
case 0x040: Win0Coords[1] = val; return;
case 0x041: Win0Coords[0] = val; return;
case 0x042: Win1Coords[1] = val; return;
case 0x043: Win1Coords[0] = val; return;
case 0x044: Win0Coords[3] = val; return;
case 0x045: Win0Coords[2] = val; return;
case 0x046: Win1Coords[3] = val; return;
case 0x047: Win1Coords[2] = val; return;
case 0x048: WinCnt[0] = val; return;
case 0x049: WinCnt[1] = val; return;
case 0x04A: WinCnt[2] = val; return;
case 0x04B: WinCnt[3] = val; return;
case 0x04C:
BGMosaicSize[0] = val & 0xF;
BGMosaicSize[1] = val >> 4;
return;
case 0x04D:
OBJMosaicSize[0] = val & 0xF;
OBJMosaicSize[1] = val >> 4;
return;
case 0x050: BlendCnt = (BlendCnt & 0x3F00) | val; return;
case 0x051: BlendCnt = (BlendCnt & 0x00FF) | (val << 8); return;
case 0x052:
BlendAlpha = (BlendAlpha & 0x1F00) | (val & 0x1F);
EVA = val & 0x1F;
if (EVA > 16) EVA = 16;
return;
case 0x053:
BlendAlpha = (BlendAlpha & 0x001F) | ((val & 0x1F) << 8);
EVB = val & 0x1F;
if (EVB > 16) EVB = 16;
return;
case 0x054:
EVY = val & 0x1F;
if (EVY > 16) EVY = 16;
return;
}
printf("unknown GPU write8 %08X %02X\n", addr, val);
}
void GPU2D::Write16(u32 addr, u16 val)
{
switch (addr & 0x00000FFF)
{
case 0x000: DispCnt = (DispCnt & 0xFFFF0000) | val; return;
case 0x002: DispCnt = (DispCnt & 0x0000FFFF) | (val << 16); return;
case 0x008: BGCnt[0] = val; return;
case 0x00A: BGCnt[1] = val; return;
case 0x00C: BGCnt[2] = val; return;
case 0x00E: BGCnt[3] = val; return;
case 0x010: BGXPos[0] = val; return;
case 0x012: BGYPos[0] = val; return;
case 0x014: BGXPos[1] = val; return;
case 0x016: BGYPos[1] = val; return;
case 0x018: BGXPos[2] = val; return;
case 0x01A: BGYPos[2] = val; return;
case 0x01C: BGXPos[3] = val; return;
case 0x01E: BGYPos[3] = val; return;
case 0x020: BGRotA[0] = val; return;
case 0x022: BGRotB[0] = val; return;
case 0x024: BGRotC[0] = val; return;
case 0x026: BGRotD[0] = val; return;
case 0x028:
BGXRef[0] = (BGXRef[0] & 0xFFFF0000) | val;
if (GPU::VCount < 192) BGXRefInternal[0] = BGXRef[0];
return;
case 0x02A:
if (val & 0x0800) val |= 0xF000;
BGXRef[0] = (BGXRef[0] & 0xFFFF) | (val << 16);
if (GPU::VCount < 192) BGXRefInternal[0] = BGXRef[0];
return;
case 0x02C:
BGYRef[0] = (BGYRef[0] & 0xFFFF0000) | val;
if (GPU::VCount < 192) BGYRefInternal[0] = BGYRef[0];
return;
case 0x02E:
if (val & 0x0800) val |= 0xF000;
BGYRef[0] = (BGYRef[0] & 0xFFFF) | (val << 16);
if (GPU::VCount < 192) BGYRefInternal[0] = BGYRef[0];
return;
case 0x030: BGRotA[1] = val; return;
case 0x032: BGRotB[1] = val; return;
case 0x034: BGRotC[1] = val; return;
case 0x036: BGRotD[1] = val; return;
case 0x038:
BGXRef[1] = (BGXRef[1] & 0xFFFF0000) | val;
if (GPU::VCount < 192) BGXRefInternal[1] = BGXRef[1];
return;
case 0x03A:
if (val & 0x0800) val |= 0xF000;
BGXRef[1] = (BGXRef[1] & 0xFFFF) | (val << 16);
if (GPU::VCount < 192) BGXRefInternal[1] = BGXRef[1];
return;
case 0x03C:
BGYRef[1] = (BGYRef[1] & 0xFFFF0000) | val;
if (GPU::VCount < 192) BGYRefInternal[1] = BGYRef[1];
return;
case 0x03E:
if (val & 0x0800) val |= 0xF000;
BGYRef[1] = (BGYRef[1] & 0xFFFF) | (val << 16);
if (GPU::VCount < 192) BGYRefInternal[1] = BGYRef[1];
return;
case 0x040:
Win0Coords[1] = val & 0xFF;
Win0Coords[0] = val >> 8;
return;
case 0x042:
Win1Coords[1] = val & 0xFF;
Win1Coords[0] = val >> 8;
return;
case 0x044:
Win0Coords[3] = val & 0xFF;
Win0Coords[2] = val >> 8;
return;
case 0x046:
Win1Coords[3] = val & 0xFF;
Win1Coords[2] = val >> 8;
return;
case 0x048:
WinCnt[0] = val & 0xFF;
WinCnt[1] = val >> 8;
return;
case 0x04A:
WinCnt[2] = val & 0xFF;
WinCnt[3] = val >> 8;
return;
case 0x04C:
BGMosaicSize[0] = val & 0xF;
BGMosaicSize[1] = (val >> 4) & 0xF;
OBJMosaicSize[0] = (val >> 8) & 0xF;
OBJMosaicSize[1] = val >> 12;
return;
case 0x050: BlendCnt = val & 0x3FFF; return;
case 0x052:
BlendAlpha = val & 0x1F1F;
EVA = val & 0x1F;
if (EVA > 16) EVA = 16;
EVB = (val >> 8) & 0x1F;
if (EVB > 16) EVB = 16;
return;
case 0x054:
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);
}
void GPU2D::Write32(u32 addr, u32 val)
{
switch (addr & 0x00000FFF)
{
case 0x000:
DispCnt = val;
return;
case 0x028:
if (val & 0x08000000) val |= 0xF0000000;
BGXRef[0] = val;
if (GPU::VCount < 192) BGXRefInternal[0] = BGXRef[0];
return;
case 0x02C:
if (val & 0x08000000) val |= 0xF0000000;
BGYRef[0] = val;
if (GPU::VCount < 192) BGYRefInternal[0] = BGYRef[0];
return;
case 0x038:
if (val & 0x08000000) val |= 0xF0000000;
BGXRef[1] = val;
if (GPU::VCount < 192) BGXRefInternal[1] = BGXRef[1];
return;
case 0x03C:
if (val & 0x08000000) val |= 0xF0000000;
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);
Write16(addr+2, val>>16);
}
void GPU2D::DrawScanline(u32 line)
{
u32* dst = &Framebuffer[256*line];
u32 mode1gfx[256];
// request each 3D scanline in advance
// this is required for the threaded mode of the software renderer
// (alternately we could call GetLine() once and store the result somewhere)
if (Num == 0)
GPU3D::RequestLine(line);
line = GPU::VCount;
// 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;
return;
}
// forced blank
// (checkme: are there still things that can run under this mode? likely not)
if (DispCnt & (1<<7))
{
for (int i = 0; i < 256; i++)
dst[i] = 0xFFFFFFFF;
return;
}
u32 dispmode = DispCnt >> 16;
dispmode &= (Num ? 0x1 : 0x3);
// always render regular graphics
DrawScanline_Mode1(line, mode1gfx);
switch (dispmode)
{
case 0: // screen off
{
for (int i = 0; i < 256; i++)
dst[i] = 0xFF3F3F3F;
}
break;
case 1: // regular display
{
for (int i = 0; i < 256; i++)
dst[i] = mode1gfx[i];
}
break;
case 2: // VRAM display
{
u32 vrambank = (DispCnt >> 18) & 0x3;
if (GPU::VRAMMap_LCDC & (1<<vrambank))
{
u16* vram = (u16*)GPU::VRAM[vrambank];
vram = &vram[line * 256];
for (int i = 0; i < 256; i++)
{
u16 color = vram[i];
u8 r = (color & 0x001F) << 1;
u8 g = (color & 0x03E0) >> 4;
u8 b = (color & 0x7C00) >> 9;
dst[i] = r | (g << 8) | (b << 16);
}
}
else
{
for (int i = 0; i < 256; i++)
{
dst[i] = 0;
}
}
}
break;
case 3: // FIFO display
{
for (int i = 0; i < 256; i++)
{
u16 color = DispFIFOBuffer[i];
u8 r = (color & 0x001F) << 1;
u8 g = (color & 0x03E0) >> 4;
u8 b = (color & 0x7C00) >> 9;
dst[i] = r | (g << 8) | (b << 16);
}
}
break;
}
// capture
if ((Num == 0) && (CaptureCnt & (1<<31)))
{
u32 capwidth, capheight;
switch ((CaptureCnt >> 20) & 0x3)
{
case 0: capwidth = 128; capheight = 128; break;
case 1: capwidth = 256; capheight = 64; break;
case 2: capwidth = 256; capheight = 128; break;
case 3: capwidth = 256; capheight = 192; break;
}
if (line < capheight)
DoCapture(line, capwidth, mode1gfx);
}
// master brightness
if (dispmode != 0)
{
if ((MasterBrightness >> 14) == 1)
{
// up
u32 factor = MasterBrightness & 0x1F;
if (factor > 16) factor = 16;
for (int i = 0; i < 256; i++)
{
u32 val = dst[i];
u32 r = val & 0x00003F;
u32 g = val & 0x003F00;
u32 b = val & 0x3F0000;
r += (((0x00003F - r) * factor) >> 4);
g += ((((0x003F00 - g) * factor) >> 4) & 0x003F00);
b += ((((0x3F0000 - b) * factor) >> 4) & 0x3F0000);
dst[i] = r | g | b;
}
}
else if ((MasterBrightness >> 14) == 2)
{
// down
u32 factor = MasterBrightness & 0x1F;
if (factor > 16) factor = 16;
for (int i = 0; i < 256; i++)
{
u32 val = dst[i];
u32 r = val & 0x00003F;
u32 g = val & 0x003F00;
u32 b = val & 0x3F0000;
r -= ((r * factor) >> 4);
g -= (((g * factor) >> 4) & 0x003F00);
b -= (((b * factor) >> 4) & 0x3F0000);
dst[i] = r | g | b;
}
}
}
// convert to 32-bit BGRA
// note: 32-bit RGBA would be more straightforward, but
// BGRA seems to be more compatible (Direct2D soft, cairo...)
for (int i = 0; i < 256; i++)
{
u32 c = dst[i];
u32 r = c << 18;
u32 g = (c << 2) & 0xFC00;
u32 b = (c >> 14) & 0xFC;
c = r | g | b;
dst[i] = c | ((c & 0x00C0C0C0) >> 6) | 0xFF000000;
}
}
void GPU2D::VBlank()
{
CaptureCnt &= ~(1<<31);
DispFIFOReadPtr = 0;
DispFIFOWritePtr = 0;
}
void GPU2D::VBlankEnd()
{
// TODO: find out the exact time this happens
BGXRefInternal[0] = BGXRef[0];
BGXRefInternal[1] = BGXRef[1];
BGYRefInternal[0] = BGYRef[0];
BGYRefInternal[1] = BGYRef[1];
BGMosaicY = 0;
BGMosaicYMax = BGMosaicSize[1];
OBJMosaicY = 0;
OBJMosaicYMax = OBJMosaicSize[1];
}
void GPU2D::DoCapture(u32 line, u32 width, u32* src)
{
u32 dstvram = (CaptureCnt >> 16) & 0x3;
// TODO: confirm this
// it should work like VRAM display mode, which requires VRAM to be mapped to LCDC
if (!(GPU::VRAMMap_LCDC & (1<<dstvram)))
return;
u16* dst = (u16*)GPU::VRAM[dstvram];
u32 dstaddr = (((CaptureCnt >> 18) & 0x3) << 14) + (line * width);
if (CaptureCnt & (1<<24))
src = (u32*)GPU3D::GetLine(line);
u16* srcB = NULL;
u32 srcBaddr = line * 256;
if (CaptureCnt & (1<<25))
{
srcB = &DispFIFOBuffer[0];
srcBaddr = 0;
}
else
{
u32 srcvram = (DispCnt >> 18) & 0x3;
if (GPU::VRAMMap_LCDC & (1<<srcvram))
srcB = (u16*)GPU::VRAM[srcvram];
if (((DispCnt >> 16) & 0x3) != 2)
srcBaddr += ((CaptureCnt >> 26) & 0x3) << 14;
}
dstaddr &= 0xFFFF;
srcBaddr &= 0xFFFF;
switch ((CaptureCnt >> 29) & 0x3)
{
case 0: // source A
{
for (u32 i = 0; i < width; i++)
{
u32 val = src[i];
// TODO: check what happens when alpha=0
u32 r = (val >> 1) & 0x1F;
u32 g = (val >> 9) & 0x1F;
u32 b = (val >> 17) & 0x1F;
u32 a = ((val >> 24) != 0) ? 0x8000 : 0;
dst[dstaddr] = r | (g << 5) | (b << 10) | a;
dstaddr = (dstaddr + 1) & 0xFFFF;
}
}
break;
case 1: // source B
{
if (srcB)
{
for (u32 i = 0; i < width; i++)
{
dst[dstaddr] = srcB[srcBaddr];
srcBaddr = (srcBaddr + 1) & 0xFFFF;
dstaddr = (dstaddr + 1) & 0xFFFF;
}
}
else
{
for (u32 i = 0; i < width; i++)
{
dst[dstaddr] = 0;
dstaddr = (dstaddr + 1) & 0xFFFF;
}
}
}
break;
case 2: // sources A+B
case 3:
{
u32 eva = CaptureCnt & 0x1F;
u32 evb = (CaptureCnt >> 8) & 0x1F;
// checkme
if (eva > 16) eva = 16;
if (evb > 16) evb = 16;
if (srcB)
{
for (u32 i = 0; i < width; i++)
{
u32 val = src[i];
// TODO: check what happens when alpha=0
u32 rA = (val >> 1) & 0x1F;
u32 gA = (val >> 9) & 0x1F;
u32 bA = (val >> 17) & 0x1F;
u32 aA = ((val >> 24) != 0) ? 1 : 0;
val = srcB[srcBaddr];
u32 rB = val & 0x1F;
u32 gB = (val >> 5) & 0x1F;
u32 bB = (val >> 10) & 0x1F;
u32 aB = val >> 15;
u32 rD = ((rA * aA * eva) + (rB * aB * evb)) >> 4;
u32 gD = ((gA * aA * eva) + (gB * aB * evb)) >> 4;
u32 bD = ((bA * aA * eva) + (bB * aB * evb)) >> 4;
u32 aD = (eva>0 ? aA : 0) | (evb>0 ? aB : 0);
if (rD > 0x1F) rD = 0x1F;
if (gD > 0x1F) gD = 0x1F;
if (bD > 0x1F) bD = 0x1F;
dst[dstaddr] = rD | (gD << 5) | (bD << 10) | (aD << 15);
srcBaddr = (srcBaddr + 1) & 0xFFFF;
dstaddr = (dstaddr + 1) & 0xFFFF;
}
}
else
{
for (u32 i = 0; i < width; i++)
{
u32 val = src[i];
// TODO: check what happens when alpha=0
u32 rA = (val >> 1) & 0x1F;
u32 gA = (val >> 9) & 0x1F;
u32 bA = (val >> 17) & 0x1F;
u32 aA = ((val >> 24) != 0) ? 1 : 0;
u32 rD = (rA * aA * eva) >> 4;
u32 gD = (gA * aA * eva) >> 4;
u32 bD = (bA * aA * eva) >> 4;
u32 aD = (eva>0 ? aA : 0);
dst[dstaddr] = rD | (gD << 5) | (bD << 10) | (aD << 15);
dstaddr = (dstaddr + 1) & 0xFFFF;
}
}
}
break;
}
}
void GPU2D::SampleFIFO(u32 offset, u32 num)
{
for (u32 i = 0; i < num; i++)
{
u16 val = DispFIFO[DispFIFOReadPtr];
DispFIFOReadPtr++;
DispFIFOReadPtr &= 0xF;
DispFIFOBuffer[offset+i] = val;
}
}
void GPU2D::BGExtPalDirty(u32 base)
{
BGExtPalStatus[base] = 0;
BGExtPalStatus[base+1] = 0;
}
void GPU2D::OBJExtPalDirty()
{
OBJExtPalStatus = 0;
}
u16* GPU2D::GetBGExtPal(u32 slot, u32 pal)
{
u16* dst = &BGExtPalCache[slot][pal << 8];
if (!(BGExtPalStatus[slot] & (1<<pal)))
{
if (Num)
{
if (GPU::VRAMMap_BBGExtPal[slot] & (1<<7))
memcpy(dst, &GPU::VRAM_H[(slot << 13) + (pal << 9)], 256*2);
else
memset(dst, 0, 256*2);
}
else
{
memset(dst, 0, 256*2);
if (GPU::VRAMMap_ABGExtPal[slot] & (1<<4))
for (int i = 0; i < 256; i+=2)
*(u32*)&dst[i] |= *(u32*)&GPU::VRAM_E[(slot << 13) + (pal << 9) + (i << 1)];
if (GPU::VRAMMap_ABGExtPal[slot] & (1<<5))
for (int i = 0; i < 256; i+=2)
*(u32*)&dst[i] |= *(u32*)&GPU::VRAM_F[((slot&1) << 13) + (pal << 9) + (i << 1)];
if (GPU::VRAMMap_ABGExtPal[slot] & (1<<6))
for (int i = 0; i < 256; i+=2)
*(u32*)&dst[i] |= *(u32*)&GPU::VRAM_G[((slot&1) << 13) + (pal << 9) + (i << 1)];
}
BGExtPalStatus[slot] |= (1<<pal);
}
return dst;
}
u16* GPU2D::GetOBJExtPal(u32 pal)
{
u16* dst = &OBJExtPalCache[pal << 8];
if (!(OBJExtPalStatus & (1<<pal)))
{
if (Num)
{
if (GPU::VRAMMap_BOBJExtPal & (1<<8))
memcpy(dst, &GPU::VRAM_I[(pal << 9)], 256*2);
else
memset(dst, 0, 256*2);
}
else
{
memset(dst, 0, 256*2);
if (GPU::VRAMMap_AOBJExtPal & (1<<5))
for (int i = 0; i < 256; i+=2)
*(u32*)&dst[i] |= *(u32*)&GPU::VRAM_F[(pal << 9) + (i << 1)];
if (GPU::VRAMMap_AOBJExtPal & (1<<6))
for (int i = 0; i < 256; i+=2)
*(u32*)&dst[i] |= *(u32*)&GPU::VRAM_G[(pal << 9) + (i << 1)];
}
OBJExtPalStatus |= (1<<pal);
}
return dst;
}
void GPU2D::CheckWindows(u32 line)
{
line &= 0xFF;
if (line == Win0Coords[3]) Win0Active &= ~0x1;
else if (line == Win0Coords[2]) Win0Active |= 0x1;
if (line == Win1Coords[3]) Win1Active &= ~0x1;
else if (line == Win1Coords[2]) Win1Active |= 0x1;
}
void GPU2D::CalculateWindowMask(u32 line, u8* mask)
{
for (u32 i = 0; i < 256; i++)
mask[i] = WinCnt[2]; // window outside
if (DispCnt & ((1<<15)|(1<<12)))
{
// OBJ window
DrawSpritesWindow(line, mask);
}
if (DispCnt & (1<<14))
{
// window 1
u8 x1 = Win1Coords[0];
u8 x2 = Win1Coords[1];