piwalker/melonDS
1
0
Fork 0
mirror of https://github.com/melonDS-emu/melonDS.git synced 2025-07-25 23:29:55 -06:00
Code Issues Packages Projects Releases Wiki Activity

skeleton for 2D GPU

Browse Source
This commit is contained in:
StapleButter
2017-01-18 04:03:19 +01:00
parent bff3a92cc0
commit d30e6956fa
8 changed files with 1065 additions and 828 deletions
Download Patch File Download Diff File Expand all files Collapse all files

732
GPU2D.cpp
View File

@ -17,742 +17,82 @@
*/
#include <stdio.h>
#include <string.h>
#include "NDS.h"
#include "GPU.h"
#include "GPU2D.h"
namespace GPU2D
GPU2D::GPU2D(u32 num)
{
Num = num;
}
#define LINE_CYCLES (355*6 * 2)
#define FRAME_CYCLES (LINE_CYCLES * 263)
u16 VCount;
u16 DispStat[2], VMatch[2];
u8 Palette[2*1024];
u8 OAM[2*1024];
u8 VRAM_A[128*1024];
u8 VRAM_B[128*1024];
u8 VRAM_C[128*1024];
u8 VRAM_D[128*1024];
u8 VRAM_E[ 64*1024];
u8 VRAM_F[ 16*1024];
u8 VRAM_G[ 16*1024];
u8 VRAM_H[ 32*1024];
u8 VRAM_I[ 16*1024];
u8* VRAM[9] = {VRAM_A, VRAM_B, VRAM_C, VRAM_D, VRAM_E, VRAM_F, VRAM_G, VRAM_H, VRAM_I};
u8 VRAMCNT[9];
u8 VRAMSTAT;
u8* VRAM_ABG[128];
u8* VRAM_AOBJ[128];
u8* VRAM_BBG[128];
u8* VRAM_BOBJ[128];
u8* VRAM_LCD[128];
u8* VRAM_ARM7[2];
u16 Framebuffer[256*192*2];
void Reset()
GPU2D::~GPU2D()
{
VCount = 0;
}
DispStat[0] = 0;
DispStat[1] = 0;
VMatch[0] = 0;
VMatch[1] = 0;
void GPU2D::Reset()
{
//
}
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;
memset(VRAM_ABG, 0, sizeof(u8*)*128);
memset(VRAM_AOBJ, 0, sizeof(u8*)*128);
memset(VRAM_BBG, 0, sizeof(u8*)*128);
memset(VRAM_BOBJ, 0, sizeof(u8*)*128);
memset(VRAM_LCD, 0, sizeof(u8*)*128);
memset(VRAM_ARM7, 0, sizeof(u8*)*2);
for (int i = 0; i < 256*192*2; i++)
{
Framebuffer[i] = (i>=256*192)?0x03E0:0x7C00;
}
void GPU2D::SetFramebuffer(u16* buf)
{
// framebuffer is 256x192 16bit.
// might eventually support other framebuffer types/sizes
Framebuffer = buf;
}
// VRAM mapping shit.
// TODO eventually: work out priority orders in case of overlaps. there _are_ games that map overlapping banks.
void MapVRAM_AB(u32 bank, u8 cnt)
u8 GPU2D::Read8(u32 addr)
{
u8 oldcnt = VRAMCNT[bank];
VRAMCNT[bank] = cnt;
if (oldcnt == cnt) return;
u8 oldofs = (oldcnt >> 3) & 0x3;
u8 ofs = (cnt >> 3) & 0x3;
u8* vram = VRAM[bank];
if (oldcnt & (1<<7))
{
u8** vrammap = NULL;
switch (oldcnt & 0x3)
{
case 0:
vrammap = &VRAM_LCD[bank<<3];
break;
case 1:
vrammap = &VRAM_ABG[oldofs<<3];
break;
case 2:
oldofs &= 0x1;
vrammap = &VRAM_AOBJ[oldofs<<3];
break;
case 3:
// not mapped to memory
break;
}
if (vrammap)
{
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap = NULL;
}
}
if (cnt & (1<<7))
{
u8** vrammap = NULL;
switch (cnt & 0x3)
{
case 0:
vrammap = &VRAM_LCD[bank<<3];
break;
case 1:
vrammap = &VRAM_ABG[ofs<<3];
break;
case 2:
ofs &= 0x1;
vrammap = &VRAM_AOBJ[ofs<<3];
break;
case 3:
// not mapped to memory
break;
}
if (vrammap)
{
*vrammap++ = vram; vram += 0x4000;
*vrammap++ = vram; vram += 0x4000;
*vrammap++ = vram; vram += 0x4000;
*vrammap++ = vram; vram += 0x4000;
*vrammap++ = vram; vram += 0x4000;
*vrammap++ = vram; vram += 0x4000;
*vrammap++ = vram; vram += 0x4000;
*vrammap = vram;
}
}
printf("!! GPU2D READ8 %08X\n", addr);
}
void MapVRAM_CD(u32 bank, u8 cnt)
u16 GPU2D::Read16(u32 addr)
{
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;
u8* vram = VRAM[bank];
if (oldcnt & (1<<7))
switch (addr & 0x00000FFF)
{
u8** vrammap = NULL;
switch (oldcnt & 0x7)
{
case 0:
vrammap = &VRAM_LCD[bank<<3];
break;
case 1:
vrammap = &VRAM_ABG[oldofs<<3];
break;
case 2:
oldofs &= 0x1;
VRAM_ARM7[oldofs] = NULL;
break;
case 3:
// not mapped to memory
break;
case 4:
if (bank == 2)
vrammap = &VRAM_BBG[0];
else
vrammap = &VRAM_BOBJ[0];
break;
}
if (vrammap)
{
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap = NULL;
}
}
if (cnt & (1<<7))
{
u8** vrammap = NULL;
switch (cnt & 0x7)
{
case 0:
vrammap = &VRAM_LCD[bank<<3];
break;
case 1:
vrammap = &VRAM_ABG[ofs<<3];
break;
case 2:
ofs &= 0x1;
VRAM_ARM7[ofs] = vram;
VRAMSTAT |= (1 << (bank-2));
break;
case 3:
// not mapped to memory
break;
case 4:
if (bank == 2)
vrammap = &VRAM_BBG[0];
else
vrammap = &VRAM_BOBJ[0];
break;
}
if (vrammap)
{
*vrammap++ = vram; vram += 0x4000;
*vrammap++ = vram; vram += 0x4000;
*vrammap++ = vram; vram += 0x4000;
*vrammap++ = vram; vram += 0x4000;
*vrammap++ = vram; vram += 0x4000;
*vrammap++ = vram; vram += 0x4000;
*vrammap++ = vram; vram += 0x4000;
*vrammap = vram;
}
//
}
}
void MapVRAM_E(u32 bank, u8 cnt)
u32 GPU2D::Read32(u32 addr)
{
u8 oldcnt = VRAMCNT[bank];
VRAMCNT[bank] = cnt;
if (oldcnt == cnt) return;
u8 oldofs = (oldcnt >> 3) & 0x7;
u8 ofs = (cnt >> 3) & 0x7;
u8* vram = VRAM[bank];
if (oldcnt & (1<<7))
switch (addr & 0x00000FFF)
{
u8** vrammap = NULL;
switch (oldcnt & 0x7)
{
case 0:
VRAM_LCD[0x20] = NULL;
VRAM_LCD[0x21] = NULL;
VRAM_LCD[0x22] = NULL;
VRAM_LCD[0x23] = NULL;
break;
case 1:
vrammap = &VRAM_ABG[0];
break;
case 2:
vrammap = &VRAM_AOBJ[0];
break;
case 3:
// not mapped to memory
break;
case 4:
// BG EXTPAL -- TODO
break;
case 5:
// OBJ EXTPAL -- TODO
break;
}
if (vrammap)
{
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap = NULL;
}
//
}
if (cnt & (1<<7))
{
u8** vrammap = NULL;
switch (cnt & 0x7)
{
case 0:
VRAM_LCD[0x20] = &vram[0x0000];
VRAM_LCD[0x21] = &vram[0x4000];
VRAM_LCD[0x22] = &vram[0x8000];
VRAM_LCD[0x23] = &vram[0xC000];
break;
case 1:
vrammap = &VRAM_ABG[0];
break;
case 2:
vrammap = &VRAM_AOBJ[0];
break;
case 3:
// not mapped to memory
break;
case 4:
// BG EXTPAL -- TODO
break;
case 5:
// OBJ EXTPAL -- TODO
break;
}
if (vrammap)
{
*vrammap++ = &vram[0x0000];
*vrammap++ = &vram[0x4000];
*vrammap++ = &vram[0x8000];
*vrammap++ = &vram[0xC000];
*vrammap++ = &vram[0x0000];
*vrammap++ = &vram[0x4000];
*vrammap++ = &vram[0x8000];
*vrammap = &vram[0xC000];
}
}
return Read16(addr) | (Read16(addr+2) << 16);
}
void MapVRAM_FG(u32 bank, u8 cnt)
void GPU2D::Write8(u32 addr, u8 val)
{
u8 oldcnt = VRAMCNT[bank];
VRAMCNT[bank] = cnt;
if (oldcnt == cnt) return;
u8 oldofs = (oldcnt >> 3) & 0x7;
u8 ofs = (cnt >> 3) & 0x7;
u8* vram = VRAM[bank];
bank -= 5;
if (oldcnt & (1<<7))
{
u8** vrammap = NULL;
switch (oldcnt & 0x7)
{
case 0:
VRAM_LCD[0x24 + bank] = NULL;
break;
case 1:
vrammap = &VRAM_ABG[(oldofs & 0x1) | ((oldofs & 0x2) << 1)];
break;
case 2:
vrammap = &VRAM_AOBJ[(oldofs & 0x1) | ((oldofs & 0x2) << 1)];
break;
case 3:
// not mapped to memory
break;
case 4:
// BG EXTPAL TODO
break;
case 5:
// OBJ EXTPAL TODO
break;
}
if (vrammap)
{
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap = NULL;
}
}
if (cnt & (1<<7))
{
u8** vrammap = NULL;
switch (cnt & 0x7)
{
case 0:
VRAM_LCD[0x24 + bank] = vram;
break;
case 1:
vrammap = &VRAM_ABG[(ofs & 0x1) | ((ofs & 0x2) << 1)];
break;
case 2:
vrammap = &VRAM_AOBJ[(ofs & 0x1) | ((ofs & 0x2) << 1)];
break;
case 3:
// not mapped to memory
break;
case 4:
// BG EXTPAL TODO
break;
case 5:
// OBJ EXTPAL TODO
break;
}
if (vrammap)
{
*vrammap++ = vram;
*vrammap++ = vram;
*vrammap++ = vram;
*vrammap++ = vram;
*vrammap++ = vram;
*vrammap++ = vram;
*vrammap++ = vram;
*vrammap = vram;
}
}
printf("!! GPU2D WRITE8 %08X %02X\n", addr, val);
}
void MapVRAM_H(u32 bank, u8 cnt)
void GPU2D::Write16(u32 addr, u16 val)
{
u8 oldcnt = VRAMCNT[bank];
VRAMCNT[bank] = cnt;
if (oldcnt == cnt) return;
u8 oldofs = (oldcnt >> 3) & 0x7;
u8 ofs = (cnt >> 3) & 0x7;
u8* vram = VRAM[bank];
if (oldcnt & (1<<7))
switch (addr & 0x00000FFF)
{
u8** vrammap = NULL;
switch (oldcnt & 0x3)
{
case 0:
VRAM_LCD[0x26] = NULL;
VRAM_LCD[0x27] = NULL;
break;
case 1:
vrammap = &VRAM_BBG[0x00];
break;
case 2:
// BG EXTPAL TODO
break;
}
if (vrammap)
{
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap = NULL;
}
}
if (cnt & (1<<7))
{
u8** vrammap = NULL;
switch (cnt & 0x3)
{
case 0:
VRAM_LCD[0x26] = &vram[0x0000];
VRAM_LCD[0x27] = &vram[0x4000];
break;
case 1:
vrammap = &VRAM_BBG[0x00];
break;
case 2:
// BG EXTPAL TODO
break;
}
if (vrammap)
{
*vrammap++ = &vram[0x0000];
*vrammap++ = &vram[0x4000];
*vrammap++ = &vram[0x0000];
*vrammap++ = &vram[0x4000];
*vrammap++ = &vram[0x0000];
*vrammap++ = &vram[0x4000];
*vrammap++ = &vram[0x0000];
*vrammap = &vram[0x4000];
}
//
}
}
void MapVRAM_I(u32 bank, u8 cnt)
void GPU2D::Write32(u32 addr, u32 val)
{
u8 oldcnt = VRAMCNT[bank];
VRAMCNT[bank] = cnt;
if (oldcnt == cnt) return;
u8 oldofs = (oldcnt >> 3) & 0x7;
u8 ofs = (cnt >> 3) & 0x7;
u8* vram = VRAM[bank];
bank -= 5;
if (oldcnt & (1<<7))
switch (addr & 0x00000FFF)
{
u8** vrammap = NULL;
switch (oldcnt & 0x3)
{
case 0:
VRAM_LCD[0x28] = NULL;
break;
case 1:
vrammap = &VRAM_BBG[0x02];
break;
case 2:
vrammap = &VRAM_BOBJ[0x00];
break;
case 3:
// not mapped to memory
break;
}
if (vrammap)
{
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap++ = NULL;
*vrammap = NULL;
}
//
}
if (cnt & (1<<7))
{
u8** vrammap = NULL;
switch (cnt & 0x3)
{
case 0:
VRAM_LCD[0x28] = vram;
break;
case 1:
vrammap = &VRAM_BBG[0x02];
break;
case 2:
vrammap = &VRAM_BOBJ[0x00];
break;
case 3:
// not mapped to memory
break;
}
if (vrammap)
{
*vrammap++ = vram;
*vrammap++ = vram;
*vrammap++ = vram;
*vrammap++ = vram;
*vrammap++ = vram;
*vrammap++ = vram;
*vrammap++ = vram;
*vrammap = vram;
}
}
Write16(addr, val&0xFFFF);
Write16(addr+2, val>>16);
}
void DrawScanline(u32 screen, u32 line)
void GPU2D::DrawScanline(u32 line)
{
u16* dst = &Framebuffer[256 * ((192*screen) + line)];
if (screen==0)
{
u16* src = &((u16*)VRAM_A)[256*line];
for (int i = 0; i < 256; i++)
dst[i] = src[i];
}
else
{
for (int i = 0; i < 256; i++)
dst[i] = 0x7FFF;
}
}
void StartFrame()
{
StartScanline(0);
}
void StartScanline(u32 line)
{
VCount = line;
if (line == VMatch[0])
{
DispStat[0] |= (1<<2);
if (DispStat[0] & (1<<5)) NDS::TriggerIRQ(0, NDS::IRQ_VCount);
}
else
DispStat[0] &= ~(1<<2);
if (line == VMatch[1])
{
DispStat[1] |= (1<<2);
if (DispStat[1] & (1<<5)) NDS::TriggerIRQ(1, NDS::IRQ_VCount);
}
else
DispStat[1] &= ~(1<<2);
if (line < 192)
{
// draw
DrawScanline(0, line);
DrawScanline(1, line);
NDS::ScheduleEvent(LINE_CYCLES, StartScanline, line+1);
}
else if (line == 262)
{
// frame end
DispStat[0] &= ~(1<<0);
DispStat[1] &= ~(1<<0);
}
else
{
if (line == 192)
{
// VBlank
DispStat[0] |= (1<<0);
DispStat[1] |= (1<<0);
if (DispStat[0] & (1<<3)) NDS::TriggerIRQ(0, NDS::IRQ_VBlank);
if (DispStat[1] & (1<<3)) NDS::TriggerIRQ(1, NDS::IRQ_VBlank);
}
NDS::ScheduleEvent(LINE_CYCLES, StartScanline, line+1);
}
}
void SetDispStat(u32 cpu, u16 val)
{
val &= 0xFFB8;
DispStat[cpu] &= 0x0047;
DispStat[cpu] |= val;
VMatch[cpu] = (val >> 8) | ((val & 0x80) << 1);
if (val & 0x10) printf("!! HBLANK ENABLED\n");
}
//
}