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fixGB/ppu.c
aliaspider a41361935d add makefile and libretro target.
2017-11-03 14:11:06 +01:00

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/*
* Copyright (C) 2017 FIX94
*
* This software may be modified and distributed under the terms
* of the MIT license. See the LICENSE file for details.
*/
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <inttypes.h>
#include <string.h>
#include "cpu.h"
#include "ppu.h"
#include "mem.h"
//FF40
#define PPU_BG_ENABLE (1<<0)
#define PPU_SPRITE_ENABLE (1<<1)
#define PPU_SPRITE_8_16 (1<<2)
#define PPU_BG_TILEMAP_UP (1<<3)
#define PPU_BG_TILEDAT_LOW (1<<4)
#define PPU_WINDOW_ENABLE (1<<5)
#define PPU_WINDOW_TILEMAP_UP (1<<6)
#define PPU_ENABLE (1<<7)
//FF40 in CGB Mode is different!
#define PPU_BG_WINDOW_PRIO (1<<0)
//FF41
#define PPU_LINEMATCH (1<<2)
#define PPU_HBLANK_IRQ (1<<3)
#define PPU_VBLANK_IRQ (1<<4)
#define PPU_OAM_IRQ (1<<5)
#define PPU_LINEMATCH_IRQ (1<<6)
//sprite byte 3 and CGB BG
#define PPU_TILE_CGB_BANK (1<<3)
#define PPU_TILE_DMG_PAL (1<<4)
#define PPU_TILE_FLIP_X (1<<5)
#define PPU_TILE_FLIP_Y (1<<6)
#define PPU_TILE_PRIO (1<<7)
static void ppuDrawDotDMG(size_t drawPos);
static void ppuDrawDotCGB_DMGMode(size_t drawPos);
static void ppuDrawDotCGB(size_t drawPos);
typedef void (*drawFunc)(size_t);
static drawFunc ppuDrawDot = NULL;
//from main.c
extern uint32_t textureImage[0x5A00];
extern bool gbCgbMode;
extern bool gbCgbBootrom;
extern bool gbAllowInvVRAM;
//used externally
uint8_t ppuCgbBank = 0;
static uint32_t ppuClock;
static uint8_t ppuMode;
static uint8_t ppuDots;
static uint8_t ppuLines;
static uint8_t ppuLineMatch;
static uint8_t ppuOAMpos;
static uint8_t ppuOAM2pos;
static uint8_t ppuCgbBgPalPos;
static uint8_t ppuCgbObjPalPos;
static uint8_t PPU_Reg[12];
static uint8_t PPU_OAM[0xA0];
static uint8_t PPU_OAM2[0x28];
static uint8_t PPU_VRAM[0x4000];
static uint32_t PPU_BGRLUT[4];
static uint8_t PPU_CGB_BGPAL[0x40];
static uint8_t PPU_CGB_OBJPAL[0x40];
static uint32_t PPU_CGB_BGRLUT[0x8000];
static bool ppuFrameDone;
static bool ppuVBlank;
static bool ppuVBlankTriggered;
static bool ppuHBlank;
static bool ppuHBlankTriggered;
//default values when starting ROM with 0x80 and 0xC0 at 0x143
static const uint8_t defaultCGBBgPal[0x40] = {
0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F,
0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F,
0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F,
0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F, 0xFF, 0x7F,
};
static const uint8_t defaultCGBObjPal[0x40] = {
0x00, 0x00, 0xF2, 0xAB, 0x61, 0xC2, 0xD9, 0xBA, 0x88, 0x6E, 0xDD, 0x63, 0x28, 0x27, 0xFB, 0x9F,
0x35, 0x42, 0xD6, 0xD4, 0x50, 0x48, 0x57, 0x5E, 0x23, 0x3E, 0x3D, 0xCA, 0x71, 0x21, 0x37, 0xC0,
0xC6, 0xB3, 0xFB, 0xF9, 0x08, 0x00, 0x8D, 0x29, 0xA3, 0x20, 0xDB, 0x87, 0x62, 0x05, 0x5D, 0xD4,
0x0E, 0x08, 0xFE, 0xAF, 0x20, 0x02, 0xD7, 0xFF, 0x07, 0x6A, 0x55, 0xEC, 0x83, 0x40, 0x0B, 0x77,
};
void ppuInit()
{
//Set start line
if(gbCgbBootrom)
{
ppuClock = 4;
ppuMode = 2;
ppuLines = 0;
}
else
{
if(gbCgbMode)
{
ppuClock = 170;
ppuMode = 1;
ppuLines = 144;
}
else
{
ppuClock = 400;
ppuMode = 1;
ppuLines = 153;
}
}
ppuDots = 0;
ppuLineMatch = 0;
ppuOAMpos = 0;
ppuOAM2pos = 0;
ppuCgbBgPalPos = 0;
ppuCgbObjPalPos = 0;
ppuCgbBank = 0;
ppuFrameDone = false;
ppuVBlank = false;
ppuVBlankTriggered = false;
ppuHBlank = false;
ppuHBlankTriggered = false;
ppuInitDrawPointer();
//init buffers
memset(PPU_Reg,0,12);
memset(PPU_OAM,0,0xA0);
memset(PPU_OAM2,0,0x28);
memset(PPU_VRAM,0,0x4000);
PPU_Reg[4] = ppuLines;
//set DMG BGR32 LUT
PPU_BGRLUT[0] = 0xFFFFFFFF; //White
PPU_BGRLUT[1] = 0xFFAAAAAA; //Light Gray
PPU_BGRLUT[2] = 0xFF555555; //Dark Gray
PPU_BGRLUT[3] = 0xFF000000; //Black
//from GBC Bootrom
if(gbCgbMode && !gbCgbBootrom)
{
memcpy(PPU_CGB_BGPAL,defaultCGBBgPal,0x40);
memcpy(PPU_CGB_OBJPAL,defaultCGBObjPal,0x40);
}
//generate CGB BGR32 LUT
uint8_t r, g, b;
uint32_t cgb_palpos = 0;
for(b = 0; b < 0x20; b++)
{
for(g = 0; g < 0x20; g++)
{
for(r = 0; r < 0x20; r++)
{
//this color mixing makes it look closer
//to what an actual GBC screen produces
PPU_CGB_BGRLUT[cgb_palpos++] =
(r+(g*2)+(b*5)) //Blue
| ((r+(g*6)+b)<<8) //Green
| (((r*7)+g)<<16) //Red
| (0xFF<<24); //Alpha
}
}
}
if(!gbCgbBootrom)
{
//From GB Bootrom
PPU_Reg[0] = 0x91;
PPU_Reg[7] = 0xFC;
PPU_Reg[8] = 0xFF;
PPU_Reg[9] = 0xFF;
}
}
void ppuInitDrawPointer()
{
//set draw method depending on DMG or CGB Mode
if(gbCgbMode)
ppuDrawDot = ppuDrawDotCGB;
else if(gbCgbBootrom)
ppuDrawDot = ppuDrawDotCGB_DMGMode;
else
ppuDrawDot = ppuDrawDotDMG;
}
static bool ppuHadIRQs = false;
void ppuCheckIRQs()
{
bool ppuHasIRQs = false;
if(ppuLineMatch && (PPU_Reg[1]&PPU_LINEMATCH_IRQ))
{
//printf("Line STAT IRQ line %i clock %i\n", ppuLines, ppuClock);
ppuHasIRQs = true;
}
else if(ppuMode == 0 && (PPU_Reg[1]&PPU_HBLANK_IRQ))
{
//printf("HBlank STAT IRQ line %i clock %i\n", ppuLines, ppuClock);
ppuHasIRQs = true;
}
else if((ppuMode == 1) && PPU_Reg[1]&PPU_VBLANK_IRQ)
{
//printf("VBlank STAT IRQ line %i clock %i\n", ppuLines, ppuClock);
ppuHasIRQs = true;
}
else if((ppuMode == 1 || ppuMode == 2) && (PPU_Reg[1]&PPU_OAM_IRQ))
{
//printf("OAM STAT IRQ line %i clock %i\n", ppuLines, ppuClock);
ppuHasIRQs = true;
}
if(ppuHasIRQs)
{
if(ppuHadIRQs == false)
{
//printf("Setting CPU IRQ\n");
memEnableStatIrq();
}
ppuHadIRQs = true;
}
else
ppuHadIRQs = false;
}
extern bool gbEmuGBSPlayback;
void ppuCycle()
{
if(gbEmuGBSPlayback)
goto ppuIncreasePos;
if(!(PPU_Reg[0] & PPU_ENABLE))
return;
//Update line match stat
ppuLineMatch = ((PPU_Reg[4] == PPU_Reg[5]) ? PPU_LINEMATCH : 0);
//check for line IRQ on first clock
if(ppuClock == 0)
{
if(ppuLines > 0) //DONT check line 0 here, already done further below
ppuCheckIRQs();
}
if(ppuLines < 144)
{
//do OAM updates
if(ppuClock < 80)
{
if(ppuClock == 0) //set OAM mode
{
ppuOAMpos = 0; //Reset check pos
ppuOAM2pos = 0; //Reset array pos
ppuMode = 2; //OAM
ppuHBlank = false;
ppuCheckIRQs();
}
if(((ppuClock&1) == 0) && ppuOAM2pos < 10)
{
uint8_t OAMcYpos = PPU_OAM[(ppuOAMpos<<2)];
if(OAMcYpos < 160)
{
int16_t cmpPos = ((int16_t)OAMcYpos)-16;
uint8_t cSpriteAdd = (PPU_Reg[0] & PPU_SPRITE_8_16) ? 16 : 8;
if(cmpPos <= ppuLines && (cmpPos+cSpriteAdd) > ppuLines)
{
memcpy(PPU_OAM2+(ppuOAM2pos<<2), PPU_OAM+(ppuOAMpos<<2), 4);
ppuOAM2pos++;
}
}
ppuOAMpos++;
}
} //enter main mode
else if(ppuClock == 80)
{
ppuDots = 0; //Reset Draw Pos
ppuMode = 3; //Main Mode
ppuHBlank = false;
} //draw point
else if(ppuClock >= 92 && ppuClock < 252)
{
//makes it possible to draw 160x144 in here :)
size_t drawPos = (ppuDots)+(ppuLines*160);
//heavy cpu load from this
ppuDrawDot(drawPos);
ppuDots++;
}
else if(ppuClock == 252)
{
ppuMode = 0; //HBlank
ppuHBlank = true;
ppuCheckIRQs();
}
} //VERY important, reg 4 to the outside gets set back to 0 early!
else if(ppuLines == 153 && ppuClock == 4)
{
PPU_Reg[4] = 0;
//check for linematch and IRQ early too
ppuLineMatch = ((PPU_Reg[4] == PPU_Reg[5]) ? PPU_LINEMATCH : 0);
ppuCheckIRQs();
}
ppuIncreasePos:
/* increase pos */
ppuClock++;
if(ppuClock == 456)
{
ppuClock = 0;
ppuLines++;
//check for vblank or draw done
if(ppuLines == 144)
{
ppuMode = 1; //VBlank
ppuHBlank = false;
ppuVBlank = true;
memEnableVBlankIrq();
ppuCheckIRQs();
//printf("VBlank Start\n");
}
else if(ppuLines == 154)
{
ppuLines = 0; //Draw Done!
ppuFrameDone = true;
ppuVBlank = false;
}
//copy our line val into public reg
PPU_Reg[4] = ppuLines;
}
return;
}
bool ppuDrawDone()
{
if(ppuFrameDone)
{
ppuFrameDone = false;
return true;
}
return false;
}
uint8_t ppuGetVRAMBank8(uint16_t addr)
{
if(gbAllowInvVRAM || !(PPU_Reg[0] & PPU_ENABLE) || (ppuMode != 3))
return PPU_VRAM[(ppuCgbBank<<13)|(addr&0x1FFF)];
return 0xFF;
}
uint8_t ppuGetVRAMNoBank8(uint16_t addr)
{
if(gbAllowInvVRAM || !(PPU_Reg[0] & PPU_ENABLE) || (ppuMode != 3))
return PPU_VRAM[addr&0x1FFF];
return 0xFF;
}
extern bool cpu_oam_dma_running;
uint8_t ppuGetOAM8(uint16_t addr)
{
if(gbAllowInvVRAM || ((!(PPU_Reg[0] & PPU_ENABLE) || (ppuMode == 0) || (ppuMode == 1)) && !cpu_oam_dma_running))
return PPU_OAM[addr&0xFF];
return 0xFF;
}
uint8_t ppuGetReg8(uint16_t addr)
{
uint8_t reg = addr&0x3F;
switch(reg)
{
case 0x0: /*case 0x1:*/ case 0x2: case 0x3: case 0x4: case 0x5:
case 0x6: case 0x7: case 0x8: case 0x9: case 0xA: case 0xB:
return PPU_Reg[reg];
case 0x1:
if(!(PPU_Reg[0] & PPU_ENABLE))
return 0x80;
else
return (PPU_Reg[1]&(~7))|(ppuMode&3)|(ppuLineMatch&4)|0x80;
case 0x28: //FF68
return ppuCgbBgPalPos|0x40;
case 0x29: //FF69
if(gbAllowInvVRAM || !(PPU_Reg[0] & PPU_ENABLE) || (ppuMode != 3))
return PPU_CGB_BGPAL[ppuCgbBgPalPos&0x3F];
return 0xFF;
case 0x2A: //FF6A
return ppuCgbObjPalPos|0x40;
case 0x2B: //FF6B
if(gbAllowInvVRAM || !(PPU_Reg[0] & PPU_ENABLE) || (ppuMode != 3))
return PPU_CGB_OBJPAL[ppuCgbObjPalPos&0x3F];
return 0xFF;
default:
break;
}
return 0xFF;
}
void ppuSetVRAMBank8(uint16_t addr, uint8_t val)
{
if(gbAllowInvVRAM || !(PPU_Reg[0] & PPU_ENABLE) || (ppuMode != 3))
PPU_VRAM[(ppuCgbBank<<13)|(addr&0x1FFF)] = val;
}
void ppuSetVRAMNoBank8(uint16_t addr, uint8_t val)
{
if(gbAllowInvVRAM || !(PPU_Reg[0] & PPU_ENABLE) || (ppuMode != 3))
PPU_VRAM[addr&0x1FFF] = val;
}
void ppuSetOAM8(uint16_t addr, uint8_t val)
{
if(gbAllowInvVRAM || ((!(PPU_Reg[0] & PPU_ENABLE) || (ppuMode == 0) || (ppuMode == 1)) && !cpu_oam_dma_running))
PPU_OAM[addr&0xFF] = val;
}
extern bool cpu_oam_dma;
extern uint16_t cpu_oam_dma_addr;
void ppuSetReg8(uint16_t addr, uint8_t val)
{
bool prevEnable;
uint8_t reg = addr&0x3F;
//printf("line %i clock %i reg %02x val %02x\n", ppuLines, ppuClock, reg, val);
switch(reg)
{
/*case 0x0: case 0x1:*/ case 0x2: case 0x3: /*case 0x4: case 0x5:*/
/*case 0x6:*/ case 0x7: case 0x8: case 0x9: case 0xA: case 0xB:
PPU_Reg[reg] = val;
break;
case 0x0: //Control reg
prevEnable = (PPU_Reg[0]&PPU_ENABLE);
PPU_Reg[0] = val;
if(prevEnable && !(val&PPU_ENABLE))
{
PPU_Reg[4] = 0;
ppuMode = 0;
ppuHadIRQs = false;
}
else if((val&PPU_ENABLE) && !prevEnable)
{
ppuLines = 0;
PPU_Reg[4] = 0;
//since it resets a bit into the screen
//it wont get through OAM fully
ppuClock = 4;
ppuOAMpos = 0; //Reset check pos
ppuOAM2pos = 0; //Reset array pos
ppuMode = 2; //OAM
ppuHBlank = false;
//re-check IRQs right on enable
ppuLineMatch = ((PPU_Reg[4] == PPU_Reg[5]) ? PPU_LINEMATCH : 0);
ppuCheckIRQs();
}
break;
case 0x1: //STAT RO Regs
if(!gbCgbMode)
{
//printf("DMG Write STAT at line %i clock %i, %d %d %d\n", ppuLines, ppuClock, (ppuMode == 0 && !(PPU_Reg[1]&PPU_HBLANK_IRQ)),
// (ppuMode == 1 && !(PPU_Reg[1]&PPU_VBLANK_IRQ)), !(ppuLineMatch && (PPU_Reg[1]&PPU_LINEMATCH_IRQ)));
//DMG STAT IRQ on HBlank/VBlank when no other IRQs previously enabled
if((ppuMode == 0 || ppuMode == 1) && !ppuHadIRQs)
{
//printf("DMG Write STAT IRQ line %i clock %i\n", ppuLines, ppuClock);
memEnableStatIrq();
}
}
PPU_Reg[1] = (val&(~7));
if(PPU_Reg[0]&PPU_ENABLE)
ppuCheckIRQs();
break;
case 0x5: //LYC
PPU_Reg[5] = val;
ppuLineMatch = ((PPU_Reg[4] == PPU_Reg[5]) ? PPU_LINEMATCH : 0);
if(PPU_Reg[0]&PPU_ENABLE)
ppuCheckIRQs();
break;
case 0x6: //OAM DMA
PPU_Reg[6] = val;
cpu_oam_dma = true;
cpu_oam_dma_addr = (val<<8);
break;
case 0x28: //FF68
ppuCgbBgPalPos = val;
break;
case 0x29: //FF69
if(gbAllowInvVRAM || !(PPU_Reg[0] & PPU_ENABLE) || (ppuMode != 3))
{
//printf("BG Write %02x to %02x\n", val, ppuCgbBgPalPos&0x3F);
PPU_CGB_BGPAL[ppuCgbBgPalPos&0x3F] = val;
if(ppuCgbBgPalPos&0x80) //auto-increment
ppuCgbBgPalPos = ((ppuCgbBgPalPos+1)&0x3F)|0x80;
}
break;
case 0x2A: //FF6A
ppuCgbObjPalPos = val;
break;
case 0x2B: //FF6B
if(gbAllowInvVRAM || !(PPU_Reg[0] & PPU_ENABLE) || (ppuMode != 3))
{
//printf("OBJ Write %02x to %02x\n", val, ppuCgbObjPalPos&0x3F);
PPU_CGB_OBJPAL[ppuCgbObjPalPos&0x3F] = val;
if(ppuCgbObjPalPos&0x80) //auto-increment
ppuCgbObjPalPos = ((ppuCgbObjPalPos+1)&0x3F)|0x80;
}
break;
default:
break;
}
}
void ppuDumpMem()
{
FILE *f = fopen("PPU_VRAM.bin","wb");
if(f)
{
fwrite(PPU_VRAM,1,gbCgbMode?0x4000:0x2000,f);
fclose(f);
}
f = fopen("PPU_OAM.bin","wb");
if(f)
{
fwrite(PPU_OAM,1,0xA0,f);
fclose(f);
}
/*f = fopen("PPU_Sprites.bin","wb");
if(f)
{
fwrite(PPU_Sprites,1,0x20,f);
fclose(f);
}*/
}
bool ppuInVBlank()
{
if(ppuVBlank)
{
if(ppuVBlankTriggered == false)
{
ppuVBlankTriggered = true;
return true;
}
else
return false;
}
ppuVBlankTriggered = false;
return false;
}
bool ppuInHBlank()
{
if(ppuHBlank)
{
if(ppuHBlankTriggered == false)
{
ppuHBlankTriggered = true;
return true;
}
else
return false;
}
ppuHBlankTriggered = false;
return false;
}
static uint8_t ppuDoSpritesDMG(uint8_t color, uint8_t tCol)
{
uint8_t i;
uint8_t cSpriteAnd = (PPU_Reg[0] & PPU_SPRITE_8_16) ? 15 : 7;
uint8_t cPrioSpriteX = 0xFF;
uint8_t ChrRegA = 0, ChrRegB = 0;
for(i = 0; i < ppuOAM2pos; i++)
{
uint8_t OAMcXpos = PPU_OAM2[(i<<2)+1];
if(OAMcXpos >= 168)
continue;
int16_t cmpPos = ((int16_t)OAMcXpos)-8;
if(cmpPos <= ppuDots && (cmpPos+8) > ppuDots)
{
uint8_t cSpriteByte3 = PPU_OAM2[(i<<2)+3];
uint8_t tVal = PPU_OAM2[(i<<2)+2];
uint8_t OAMcYpos = PPU_OAM2[(i<<2)];
uint8_t cmpYPos = OAMcYpos-16;
uint8_t cSpriteY = (ppuLines - cmpYPos)&cSpriteAnd;
uint8_t cSpriteAdd = 0; //used to select which 8 by 16 tile
if(cSpriteY > 7) //8 by 16 select
{
cSpriteAdd = 16;
cSpriteY &= 7;
}
if(PPU_Reg[0] & PPU_SPRITE_8_16)
tVal &= ~1; //clear low bit since its ALL 8 by 16 (2x the space)
if(cSpriteByte3 & PPU_TILE_FLIP_Y)
{
cSpriteY ^= 7;
if(PPU_Reg[0] & PPU_SPRITE_8_16)
cSpriteAdd ^= 16; //8 by 16 select
}
uint16_t tPos = tVal<<4;
tPos+=(cSpriteY)<<1;
ChrRegA = PPU_VRAM[(tPos+cSpriteAdd)&0x1FFF];
ChrRegB = PPU_VRAM[(tPos+cSpriteAdd+1)&0x1FFF];
uint8_t cSpriteX = (ppuDots - OAMcXpos)&7;
if(cSpriteByte3 & PPU_TILE_FLIP_X)
cSpriteX ^= 7;
uint8_t sprCol = 0;
if(ChrRegA & (0x80>>cSpriteX))
sprCol |= 1;
if(ChrRegB & (0x80>>cSpriteX))
sprCol |= 2;
//found possible candidate to display
if(sprCol != 0)
{
//there already was a sprite set with lower X
if(cPrioSpriteX < OAMcXpos)
continue;
//sprite has highest priority, return sprite
if((cSpriteByte3 & PPU_TILE_PRIO) == 0)
{
//sprite so far has highest prio so set color
if(cSpriteByte3 & PPU_TILE_DMG_PAL)
tCol = (PPU_Reg[9]>>(sprCol<<1));
else
tCol = (PPU_Reg[8]>>(sprCol<<1));
//keep looking if there is a lower X
cPrioSpriteX = OAMcXpos;
continue;
} //sprite has low priority and BG is not 0, keep BG for now
else if((color&3) != 0)
continue;
//background is 0 so set color
if(cSpriteByte3 & PPU_TILE_DMG_PAL)
tCol = (PPU_Reg[9]>>(sprCol<<1));
else
tCol = (PPU_Reg[8]>>(sprCol<<1));
//keep looking if there is a lower X
cPrioSpriteX = OAMcXpos;
continue;
}
//Sprite is 0, keep looking for sprites
}
}
return tCol;
}
static void ppuDrawDotDMG(size_t drawPos)
{
uint8_t ChrRegA = 0, ChrRegB = 0, color = 0, tCol = 0;
if(PPU_Reg[0]&PPU_BG_ENABLE)
{
uint8_t bgXPos = ppuDots+PPU_Reg[3];
uint8_t bgYPos = ppuLines+PPU_Reg[2];
uint16_t vramTilePos = ((PPU_Reg[0]&PPU_BG_TILEMAP_UP)?0x1C00:0x1800)|(((bgXPos>>3)+((bgYPos>>3)<<5))&0x3FF);
if(PPU_Reg[0]&PPU_BG_TILEDAT_LOW)
{
uint8_t tVal = PPU_VRAM[vramTilePos&0x1FFF];
uint16_t tPos = tVal<<4;
tPos+=(bgYPos&7)<<1;
ChrRegA = PPU_VRAM[(tPos)&0x1FFF];
ChrRegB = PPU_VRAM[(tPos+1)&0x1FFF];
}
else
{
int8_t tVal = (int8_t)PPU_VRAM[vramTilePos&0x1FFF];
int16_t tPos = tVal<<4;
tPos+=(bgYPos&7)<<1;
ChrRegA = PPU_VRAM[(0x1000+tPos)&0x1FFF];
ChrRegB = PPU_VRAM[(0x1000+tPos+1)&0x1FFF];
}
if(ChrRegA & (0x80>>(bgXPos&7)))
color |= 1;
if(ChrRegB & (0x80>>(bgXPos&7)))
color |= 2;
tCol = (PPU_Reg[7]>>(color<<1));
}
if(PPU_Reg[0]&PPU_WINDOW_ENABLE && (PPU_Reg[0xB]) <= ppuDots+7 && PPU_Reg[0xA] <= ppuLines)
{
uint8_t windowXPos = ppuDots+7-PPU_Reg[0xB];
uint8_t windowYPos = ppuLines-PPU_Reg[0xA];
uint16_t vramTilePos = ((PPU_Reg[0]&PPU_WINDOW_TILEMAP_UP)?0x1C00:0x1800)|(((windowXPos>>3)+((windowYPos>>3)<<5))&0x3FF);
if(PPU_Reg[0]&PPU_BG_TILEDAT_LOW)
{
uint8_t tVal = PPU_VRAM[vramTilePos&0x1FFF];
uint16_t tPos = tVal<<4;
tPos+=(windowYPos&7)<<1;
ChrRegA = PPU_VRAM[(tPos)&0x1FFF];
ChrRegB = PPU_VRAM[(tPos+1)&0x1FFF];
}
else
{
int8_t tVal = (int8_t)PPU_VRAM[vramTilePos&0x1FFF];
int16_t tPos = tVal<<4;
tPos+=(windowYPos&7)<<1;
ChrRegA = PPU_VRAM[(0x1000+tPos)&0x1FFF];
ChrRegB = PPU_VRAM[(0x1000+tPos+1)&0x1FFF];
}
color = 0;
if(ChrRegA & (0x80>>(windowXPos&7)))
color |= 1;
if(ChrRegB & (0x80>>(windowXPos&7)))
color |= 2;
tCol = (PPU_Reg[7]>>(color<<1));
}
if(PPU_Reg[0]&PPU_SPRITE_ENABLE)
tCol = ppuDoSpritesDMG(color, tCol);
//copy grayscale value from BGR32 LUT
textureImage[drawPos] = PPU_BGRLUT[tCol&3];
}
//follows same logic as DMG function, only returned color is different
static uint16_t ppuDoSpritesCGB_DMGMode(uint8_t color, uint16_t cgbRGB)
{
uint8_t i;
uint8_t cSpriteAnd = (PPU_Reg[0] & PPU_SPRITE_8_16) ? 15 : 7;
uint8_t cPrioSpriteX = 0xFF;
uint8_t ChrRegA = 0, ChrRegB = 0;
for(i = 0; i < ppuOAM2pos; i++)
{
uint8_t OAMcXpos = PPU_OAM2[(i<<2)+1];
if(OAMcXpos >= 168)
continue;
int16_t cmpPos = ((int16_t)OAMcXpos)-8;
if(cmpPos <= ppuDots && (cmpPos+8) > ppuDots)
{
uint8_t cSpriteByte3 = PPU_OAM2[(i<<2)+3];
uint8_t tVal = PPU_OAM2[(i<<2)+2];
uint8_t OAMcYpos = PPU_OAM2[(i<<2)];
uint8_t cmpYPos = OAMcYpos-16;
uint8_t cSpriteY = (ppuLines - cmpYPos)&cSpriteAnd;
uint8_t cSpriteAdd = 0; //used to select which 8 by 16 tile
if(cSpriteY > 7) //8 by 16 select
{
cSpriteAdd = 16;
cSpriteY &= 7;
}
if(PPU_Reg[0] & PPU_SPRITE_8_16)
tVal &= ~1; //clear low bit since its ALL 8 by 16 (2x the space)
if(cSpriteByte3 & PPU_TILE_FLIP_Y)
{
cSpriteY ^= 7;
if(PPU_Reg[0] & PPU_SPRITE_8_16)
cSpriteAdd ^= 16; //8 by 16 select
}
uint16_t tPos = tVal<<4;
tPos+=(cSpriteY)<<1;
ChrRegA = PPU_VRAM[(tPos+cSpriteAdd)&0x1FFF];
ChrRegB = PPU_VRAM[(tPos+cSpriteAdd+1)&0x1FFF];
uint8_t cSpriteX = (ppuDots - OAMcXpos)&7;
if(cSpriteByte3 & PPU_TILE_FLIP_X)
cSpriteX ^= 7;
uint8_t sprCol = 0;
if(ChrRegA & (0x80>>cSpriteX))
sprCol |= 1;
if(ChrRegB & (0x80>>cSpriteX))
sprCol |= 2;
//found possible candidate to display
if(sprCol != 0)
{
//there already was a sprite set with lower X
if(cPrioSpriteX < OAMcXpos)
continue;
//sprite has highest priority, return sprite
if((cSpriteByte3 & PPU_TILE_PRIO) == 0)
{
uint8_t pByte;
//sprite so far has highest prio so set color
if(cSpriteByte3 & PPU_TILE_DMG_PAL)
pByte = ((PPU_Reg[9]>>(sprCol<<1))&3)<<1;
else
pByte = ((PPU_Reg[8]>>(sprCol<<1))&3)<<1;
cgbRGB = (PPU_CGB_OBJPAL[pByte])|(PPU_CGB_OBJPAL[pByte+1]<<8);
//keep looking if there is a lower X
cPrioSpriteX = OAMcXpos;
continue;
} //sprite has low priority and BG is not 0, keep BG for now
else if((color&3) != 0)
continue;
uint8_t pByte;
//background is 0 so set color
if(cSpriteByte3 & PPU_TILE_DMG_PAL)
pByte = ((PPU_Reg[9]>>(sprCol<<1))&3)<<1;
else
pByte = ((PPU_Reg[8]>>(sprCol<<1))&3)<<1;
cgbRGB = (PPU_CGB_OBJPAL[pByte])|(PPU_CGB_OBJPAL[pByte+1]<<8);
//keep looking if there is a lower X
cPrioSpriteX = OAMcXpos;
continue;
}
//Sprite is 0, keep looking for sprites
}
}
return cgbRGB;
}
//follows same logic as DMG function, only displayed color is different
static void ppuDrawDotCGB_DMGMode(size_t drawPos)
{
uint8_t ChrRegA = 0, ChrRegB = 0, color = 0;
uint8_t pByte = (PPU_Reg[7]&3)<<1;
uint16_t cgbRGB = (PPU_CGB_OBJPAL[pByte])|(PPU_CGB_OBJPAL[pByte+1]<<8);
if(PPU_Reg[0]&PPU_BG_ENABLE)
{
uint8_t bgXPos = ppuDots+PPU_Reg[3];
uint8_t bgYPos = ppuLines+PPU_Reg[2];
uint16_t vramTilePos = ((PPU_Reg[0]&PPU_BG_TILEMAP_UP)?0x1C00:0x1800)|(((bgXPos>>3)+((bgYPos>>3)<<5))&0x3FF);
if(PPU_Reg[0]&PPU_BG_TILEDAT_LOW)
{
uint8_t tVal = PPU_VRAM[vramTilePos&0x1FFF];
uint16_t tPos = tVal<<4;
tPos+=(bgYPos&7)<<1;
ChrRegA = PPU_VRAM[(tPos)&0x1FFF];
ChrRegB = PPU_VRAM[(tPos+1)&0x1FFF];
}
else
{
int8_t tVal = (int8_t)PPU_VRAM[vramTilePos&0x1FFF];
int16_t tPos = tVal<<4;
tPos+=(bgYPos&7)<<1;
ChrRegA = PPU_VRAM[(0x1000+tPos)&0x1FFF];
ChrRegB = PPU_VRAM[(0x1000+tPos+1)&0x1FFF];
}
if(ChrRegA & (0x80>>(bgXPos&7)))
color |= 1;
if(ChrRegB & (0x80>>(bgXPos&7)))
color |= 2;
pByte = ((PPU_Reg[7]>>(color<<1))&3)<<1;
cgbRGB = (PPU_CGB_BGPAL[pByte])|(PPU_CGB_BGPAL[pByte+1]<<8);
}
if(PPU_Reg[0]&PPU_WINDOW_ENABLE && (PPU_Reg[0xB]) <= ppuDots+7 && PPU_Reg[0xA] <= ppuLines)
{
uint8_t windowXPos = ppuDots+7-PPU_Reg[0xB];
uint8_t windowYPos = ppuLines-PPU_Reg[0xA];
uint16_t vramTilePos = ((PPU_Reg[0]&PPU_WINDOW_TILEMAP_UP)?0x1C00:0x1800)|(((windowXPos>>3)+((windowYPos>>3)<<5))&0x3FF);
if(PPU_Reg[0]&PPU_BG_TILEDAT_LOW)
{
uint8_t tVal = PPU_VRAM[vramTilePos&0x1FFF];
uint16_t tPos = tVal<<4;
tPos+=(windowYPos&7)<<1;
ChrRegA = PPU_VRAM[(tPos)&0x1FFF];
ChrRegB = PPU_VRAM[(tPos+1)&0x1FFF];
}
else
{
int8_t tVal = (int8_t)PPU_VRAM[vramTilePos&0x1FFF];
int16_t tPos = tVal<<4;
tPos+=(windowYPos&7)<<1;
ChrRegA = PPU_VRAM[(0x1000+tPos)&0x1FFF];
ChrRegB = PPU_VRAM[(0x1000+tPos+1)&0x1FFF];
}
color = 0;
if(ChrRegA & (0x80>>(windowXPos&7)))
color |= 1;
if(ChrRegB & (0x80>>(windowXPos&7)))
color |= 2;
pByte = ((PPU_Reg[7]>>(color<<1))&3)<<1;
cgbRGB = (PPU_CGB_BGPAL[pByte])|(PPU_CGB_BGPAL[pByte+1]<<8);
}
if(PPU_Reg[0]&PPU_SPRITE_ENABLE)
cgbRGB = ppuDoSpritesCGB_DMGMode(color, cgbRGB);
//copy color value from BGR32 LUT
textureImage[drawPos] = PPU_CGB_BGRLUT[cgbRGB&0x7FFF];
}
static uint16_t ppuDoSpritesCGB(uint8_t color, uint16_t cgbRGB)
{
uint8_t i;
uint8_t cSpriteAnd = (PPU_Reg[0] & PPU_SPRITE_8_16) ? 15 : 7;
uint8_t ChrRegA = 0, ChrRegB = 0;
for(i = 0; i < ppuOAM2pos; i++)
{
uint8_t OAMcXpos = PPU_OAM2[(i<<2)+1];
if(OAMcXpos >= 168)
continue;
int16_t cmpPos = ((int16_t)OAMcXpos)-8;
if(cmpPos <= ppuDots && (cmpPos+8) > ppuDots)
{
uint8_t cSpriteByte3 = PPU_OAM2[(i<<2)+3];
uint16_t tCgbBank = (cSpriteByte3&PPU_TILE_CGB_BANK)?0x2000:0x0;
uint8_t tVal = PPU_OAM2[(i<<2)+2];
uint8_t OAMcYpos = PPU_OAM2[(i<<2)];
uint8_t cmpYPos = OAMcYpos-16;
uint8_t cSpriteY = (ppuLines - cmpYPos)&cSpriteAnd;
uint8_t cSpriteAdd = 0; //used to select which 8 by 16 tile
if(cSpriteY > 7) //8 by 16 select
{
cSpriteAdd = 16;
cSpriteY &= 7;
}
if(PPU_Reg[0] & PPU_SPRITE_8_16)
tVal &= ~1; //clear low bit since its ALL 8 by 16 (2x the space)
if(cSpriteByte3 & PPU_TILE_FLIP_Y)
{
cSpriteY ^= 7;
if(PPU_Reg[0] & PPU_SPRITE_8_16)
cSpriteAdd ^= 16; //8 by 16 select
}
uint16_t tPos = tVal<<4;
tPos+=(cSpriteY)<<1;
ChrRegA = PPU_VRAM[tCgbBank|((tPos+cSpriteAdd)&0x1FFF)];
ChrRegB = PPU_VRAM[tCgbBank|((tPos+cSpriteAdd+1)&0x1FFF)];
uint8_t cSpriteX = (ppuDots - OAMcXpos)&7;
if(cSpriteByte3 & PPU_TILE_FLIP_X)
cSpriteX ^= 7;
uint8_t sprCol = 0;
if(ChrRegA & (0x80>>cSpriteX))
sprCol |= 1;
if(ChrRegB & (0x80>>cSpriteX))
sprCol |= 2;
//found possible candidate to display
if(sprCol != 0)
{
//BG Master Disable, return sprite
if((PPU_Reg[0] & PPU_BG_WINDOW_PRIO) == 0)
{
uint8_t pByte = ((cSpriteByte3&7)<<3)|(sprCol<<1);
cgbRGB = (PPU_CGB_OBJPAL[pByte])|(PPU_CGB_OBJPAL[pByte+1]<<8);
break;
}
//sprite has highest priority, return sprite
if((cSpriteByte3 & PPU_TILE_PRIO) == 0)
{
uint8_t pByte = ((cSpriteByte3&7)<<3)|(sprCol<<1);
cgbRGB = (PPU_CGB_OBJPAL[pByte])|(PPU_CGB_OBJPAL[pByte+1]<<8);
break;
} //sprite has low priority and BG is not 0, keep BG for now
else if((color&3) != 0)
continue;
//background is 0 so set color
uint8_t pByte = ((cSpriteByte3&7)<<3)|(sprCol<<1);
cgbRGB = (PPU_CGB_OBJPAL[pByte])|(PPU_CGB_OBJPAL[pByte+1]<<8);
break;
}
//Sprite is 0, keep looking for sprites
}
}
return cgbRGB;
}
static void ppuDrawDotCGB(size_t drawPos)
{
uint8_t ChrRegA = 0, ChrRegB = 0, color = 0;
uint8_t bgXPos = ppuDots+PPU_Reg[3];
uint8_t bgYPos = ppuLines+PPU_Reg[2];
uint16_t vramTilePos = ((PPU_Reg[0]&PPU_BG_TILEMAP_UP)?0x1C00:0x1800)|(((bgXPos>>3)+((bgYPos>>3)<<5))&0x3FF);
uint8_t tCgbVal = PPU_VRAM[0x2000|(vramTilePos&0x1FFF)];
uint16_t tCgbBank = (tCgbVal&PPU_TILE_CGB_BANK)?0x2000:0x0;
if(tCgbVal & PPU_TILE_FLIP_Y)
bgYPos ^= 7;
if(PPU_Reg[0]&PPU_BG_TILEDAT_LOW)
{
uint8_t tVal = PPU_VRAM[vramTilePos&0x1FFF];
uint16_t tPos = tVal<<4;
tPos+=(bgYPos&7)<<1;
ChrRegA = PPU_VRAM[tCgbBank|((tPos)&0x1FFF)];
ChrRegB = PPU_VRAM[tCgbBank|((tPos+1)&0x1FFF)];
}
else
{
int8_t tVal = (int8_t)PPU_VRAM[vramTilePos&0x1FFF];
int16_t tPos = tVal<<4;
tPos+=(bgYPos&7)<<1;
ChrRegA = PPU_VRAM[tCgbBank|((0x1000+tPos)&0x1FFF)];
ChrRegB = PPU_VRAM[tCgbBank|((0x1000+tPos+1)&0x1FFF)];
}
if(tCgbVal & PPU_TILE_FLIP_X)
bgXPos ^= 7;
if(ChrRegA & (0x80>>(bgXPos&7)))
color |= 1;
if(ChrRegB & (0x80>>(bgXPos&7)))
color |= 2;
bool bgHighestPrio = (color && (tCgbVal & PPU_TILE_PRIO) && (PPU_Reg[0] & PPU_BG_WINDOW_PRIO));
uint8_t pByte = ((tCgbVal&7)<<3)|(color<<1);
uint16_t cgbRGB = (PPU_CGB_BGPAL[pByte])|(PPU_CGB_BGPAL[pByte+1]<<8);
if(PPU_Reg[0]&PPU_WINDOW_ENABLE && (PPU_Reg[0xB]) <= ppuDots+7 && PPU_Reg[0xA] <= ppuLines)
{
uint8_t windowXPos = ppuDots+7-PPU_Reg[0xB];
uint8_t windowYPos = ppuLines-PPU_Reg[0xA];
vramTilePos = ((PPU_Reg[0]&PPU_WINDOW_TILEMAP_UP)?0x1C00:0x1800)|(((windowXPos>>3)+((windowYPos>>3)<<5))&0x3FF);
tCgbVal = PPU_VRAM[0x2000|(vramTilePos&0x1FFF)];
tCgbBank = (tCgbVal&PPU_TILE_CGB_BANK)?0x2000:0x0;
bgHighestPrio = (color && (tCgbVal & PPU_TILE_PRIO) && (PPU_Reg[0] & PPU_BG_WINDOW_PRIO));
if(tCgbVal & PPU_TILE_FLIP_Y)
windowYPos ^= 7;
if(PPU_Reg[0]&PPU_BG_TILEDAT_LOW)
{
uint8_t tVal = PPU_VRAM[vramTilePos&0x1FFF];
uint16_t tPos = tVal<<4;
tPos+=(windowYPos&7)<<1;
ChrRegA = PPU_VRAM[tCgbBank|((tPos)&0x1FFF)];
ChrRegB = PPU_VRAM[tCgbBank|((tPos+1)&0x1FFF)];
}
else
{
int8_t tVal = (int8_t)PPU_VRAM[vramTilePos&0x1FFF];
int16_t tPos = tVal<<4;
tPos+=(windowYPos&7)<<1;
ChrRegA = PPU_VRAM[tCgbBank|((0x1000+tPos)&0x1FFF)];
ChrRegB = PPU_VRAM[tCgbBank|((0x1000+tPos+1)&0x1FFF)];
}
if(tCgbVal & PPU_TILE_FLIP_X)
windowXPos ^= 7;
color = 0;
if(ChrRegA & (0x80>>(windowXPos&7)))
color |= 1;
if(ChrRegB & (0x80>>(windowXPos&7)))
color |= 2;
pByte = ((tCgbVal&7)<<3)|(color<<1);
cgbRGB = (PPU_CGB_BGPAL[pByte])|(PPU_CGB_BGPAL[pByte+1]<<8);
}
if(!bgHighestPrio && PPU_Reg[0]&PPU_SPRITE_ENABLE)
cgbRGB = ppuDoSpritesCGB(color, cgbRGB);
//copy color value from BGR32 LUT
textureImage[drawPos] = PPU_CGB_BGRLUT[cgbRGB&0x7FFF];
}
//64x12 1BPP "Track"
static const uint8_t ppuGBSTextTrack[96] =
{
0x0C, 0x1C, 0x03, 0xD8, 0x7C, 0x71, 0xC0, 0x00, 0x0C, 0x1C, 0x07, 0xF8, 0xFE, 0x73, 0x80, 0x00,
0x0C, 0x1C, 0x06, 0x39, 0xE2, 0x77, 0x00, 0x00, 0x0C, 0x1C, 0x07, 0x39, 0xC0, 0x7E, 0x00, 0x00,
0x0C, 0x1C, 0x07, 0xF9, 0xC0, 0x7C, 0x00, 0x00, 0x0C, 0x1C, 0x01, 0xF9, 0xC0, 0x7C, 0x00, 0x00,
0x0C, 0x1E, 0x60, 0x38, 0xE2, 0x7E, 0x00, 0x00, 0x0C, 0x1F, 0xE3, 0xF8, 0xFE, 0x77, 0x00, 0x00,
0x0C, 0x1D, 0xC3, 0xF0, 0x3C, 0x73, 0xC0, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00,
0xFF, 0xC0, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00, 0xFF, 0xC0, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00,
};
//128x12 1BPP "0123456789/"
static const uint8_t ppuGbsTextRest[192] =
{
0x0E, 0x1F, 0xF7, 0xF8, 0xF8, 0x03, 0x9F, 0x01, 0xF0, 0x60, 0x1F, 0x0F, 0x83, 0x00, 0x00, 0x00,
0x3F, 0x9F, 0xF7, 0xF9, 0xFC, 0x03, 0x9F, 0xC3, 0xF8, 0x70, 0x3F, 0x8F, 0xC3, 0x00, 0x00, 0x00,
0x3B, 0x83, 0x83, 0x80, 0x0E, 0x7F, 0xC1, 0xE7, 0x1C, 0x70, 0x71, 0xC0, 0xE1, 0x80, 0x00, 0x00,
0x71, 0xC3, 0x81, 0xC0, 0x0E, 0x7F, 0xC0, 0xE7, 0x1C, 0x30, 0x71, 0xC0, 0x71, 0x80, 0x00, 0x00,
0x79, 0xC3, 0x80, 0xE0, 0x0E, 0x63, 0x80, 0xE7, 0x1C, 0x38, 0x71, 0xC7, 0x70, 0xC0, 0x00, 0x00,
0x7D, 0xC3, 0x80, 0x70, 0x7E, 0x33, 0x81, 0xE7, 0x1C, 0x18, 0x3F, 0x8F, 0xF0, 0xC0, 0x00, 0x00,
0x77, 0xC3, 0x80, 0x70, 0x7C, 0x13, 0x9F, 0xC7, 0xF8, 0x1C, 0x1F, 0x1C, 0x70, 0x60, 0x00, 0x00,
0x73, 0xC3, 0x80, 0x38, 0x0E, 0x1B, 0x9F, 0x87, 0x70, 0x1C, 0x31, 0x9C, 0x70, 0x60, 0x00, 0x00,
0x71, 0xC3, 0x80, 0x38, 0x0E, 0x0B, 0x9C, 0x07, 0x00, 0x0C, 0x71, 0xDC, 0x70, 0x30, 0x00, 0x00,
0x3B, 0x9F, 0x80, 0x38, 0x0E, 0x0F, 0x9C, 0x03, 0x80, 0x0E, 0x71, 0xDC, 0x70, 0x30, 0x00, 0x00,
0x3F, 0x8F, 0x83, 0xF1, 0xFC, 0x07, 0x9F, 0xC1, 0xF9, 0xFE, 0x3F, 0x8F, 0xE0, 0x18, 0x00, 0x00,
0x0E, 0x03, 0x81, 0xE0, 0xF8, 0x03, 0x9F, 0xC0, 0xF9, 0xFE, 0x1F, 0x07, 0xC0, 0x18, 0x00, 0x00,
};
static void ppuDrawRest(uint8_t curX, uint8_t sym)
{
uint8_t i, j;
for(i = 0; i < 12; i++)
{
for(j = 0; j < 10; j++)
{
size_t drawPos = (j+curX)+((i+4)*160);
uint8_t xSel = (j+(sym*10));
if(ppuGbsTextRest[((11-i)<<4)+(xSel>>3)]&(0x80>>(xSel&7)))
textureImage[drawPos] = 0xFFFFFFFF; //White
else
textureImage[drawPos] = 0xFF000000; //Black
}
}
}
void ppuDrawGBSTrackNum(uint8_t cTrack, uint8_t trackTotal)
{
memset(textureImage,0,0x16800);
uint8_t curX = 4;
//draw "Track"
uint8_t i, j;
for(i = 0; i < 12; i++)
{
for(j = 0; j < 50; j++)
{
size_t drawPos = (j+curX)+((i+4)*160);
if(ppuGBSTextTrack[((11-i)<<3)+(j>>3)]&(0x80>>(j&7)))
textureImage[drawPos] = 0xFFFFFFFF; //White
else
textureImage[drawPos] = 0xFF000000; //Black
}
}
//"Track" len+space
curX+=60;
//draw current num
if(cTrack > 99)
{
ppuDrawRest(curX, (cTrack/100)%10);
curX+=10;
}
if(cTrack > 9)
{
ppuDrawRest(curX, (cTrack/10)%10);
curX+=10;
}
ppuDrawRest(curX, cTrack%10);
curX+=10;
//draw the "/"
ppuDrawRest(curX, 10);
curX+=10;
//draw total num
if(trackTotal > 99)
{
ppuDrawRest(curX, (trackTotal/100)%10);
curX+=10;
}
if(trackTotal > 9)
{
ppuDrawRest(curX, (trackTotal/10)%10);
curX+=10;
}
ppuDrawRest(curX, trackTotal%10);
curX+=10;
}
void ppuSetOAMDMAVal(uint8_t pos, uint8_t val)
{
PPU_OAM[pos] = val;
}
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