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melonDS
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an attempt at shitty extended "tile+rotscale" BGs

This commit is contained in:
StapleButter 2017-02-02 01:18:03 +01:00
parent 6486d0e10d
commit 7e9972e037
3 changed files with 153 additions and 10 deletions
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147
GPU2D.cpp
View File

@ -37,6 +37,12 @@ void GPU2D::Reset()
memset(BGCnt, 0, 4*2);
memset(BGXPos, 0, 4*2);
memset(BGYPos, 0, 4*2);
memset(BGXCenter, 0, 2*4);
memset(BGYCenter, 0, 2*4);
memset(BGRotA, 0, 2*2);
memset(BGRotB, 0, 2*2);
memset(BGRotC, 0, 2*2);
memset(BGRotD, 0, 2*2);
}
void GPU2D::SetFramebuffer(u16* buf)
@ -111,6 +117,16 @@ void GPU2D::Write16(u32 addr, u16 val)
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 0x030: BGRotA[1] = val; return;
case 0x032: BGRotB[1] = val; return;
case 0x034: BGRotC[1] = val; return;
case 0x036: BGRotD[1] = val; return;
}
//printf("unknown GPU write16 %08X %04X\n", addr, val);
@ -124,6 +140,24 @@ void GPU2D::Write32(u32 addr, u32 val)
//printf("DISPCNT=%08X\n", val);
DispCnt = val;
return;
case 0x028:
if (val & 0x08000000) val |= 0xF0000000;
BGXCenter[0] = val;
return;
case 0x02C:
if (val & 0x08000000) val |= 0xF0000000;
BGYCenter[0] = val;
return;
case 0x038:
if (val & 0x08000000) val |= 0xF0000000;
BGXCenter[1] = val;
return;
case 0x03C:
if (val & 0x08000000) val |= 0xF0000000;
BGYCenter[1] = val;
return;
}
Write16(addr, val&0xFFFF);
@ -171,8 +205,6 @@ void GPU2D::DrawScanline(u32 line)
}
}
// temp. hax
#define DrawBG_Text DrawBG_Text_4bpp
template<u32 bgmode>
void GPU2D::DrawScanlineBGMode(u32 line, u32* spritebuf, u16* dst)
@ -184,7 +216,7 @@ void GPU2D::DrawScanlineBGMode(u32 line, u32* spritebuf, u16* dst)
if (DispCnt & 0x0800)
{
if (bgmode >= 3)
{} // todo: ext
DrawBG_Extended(line, dst, 3);
else if (bgmode >= 1)
{} // todo: rotscale
else
@ -196,7 +228,7 @@ void GPU2D::DrawScanlineBGMode(u32 line, u32* spritebuf, u16* dst)
if (DispCnt & 0x0400)
{
if (bgmode == 5)
{} // todo: ext
DrawBG_Extended(line, dst, 3);
else if (bgmode == 4 || bgmode == 2)
{} // todo: rotscale
else
@ -258,7 +290,7 @@ void GPU2D::DrawScanline_Mode1(u32 line, u16* dst)
}
void GPU2D::DrawBG_Text_4bpp(u32 line, u16* dst, u32 bgnum)
void GPU2D::DrawBG_Text(u32 line, u16* dst, u32 bgnum)
{
u16 bgcnt = BGCnt[bgnum];
@ -413,6 +445,110 @@ void GPU2D::DrawBG_Text_4bpp(u32 line, u16* dst, u32 bgnum)
}
}
void GPU2D::DrawBG_Extended(u32 line, u16* dst, u32 bgnum)
{
u16 bgcnt = BGCnt[bgnum];
u8* tileset;
u16* tilemap;
u16* pal;
u32 extpal;
u32 widexmask = (bgcnt & 0x4000) ? 0x10000 : 0;
u32 wideymask = ((bgcnt & 0xC000) == 0xC000) ? 0x10000 : 0;
extpal = (DispCnt & 0x40000000);
if (Num)
{
tileset = (u8*)GPU::VRAM_BBG[((bgcnt & 0x003C) >> 2)];
tilemap = (u16*)GPU::VRAM_BBG[((bgcnt & 0x1800) >> 11)];
if (!tileset || !tilemap) return;
tilemap += ((bgcnt & 0x0700) << 2);
if (extpal)
{
pal = (u16*)GPU::VRAM_BBGExtPal[bgnum];
// derp
if (!pal) pal = (u16*)&GPU::Palette[0x400];
}
else
pal = (u16*)&GPU::Palette[0x400];
}
else
{
tileset = (u8*)GPU::VRAM_ABG[((DispCnt & 0x07000000) >> 22) + ((bgcnt & 0x003C) >> 2)];
tilemap = (u16*)GPU::VRAM_ABG[((DispCnt & 0x38000000) >> 25) + ((bgcnt & 0x1800) >> 11)];
if (!tileset || !tilemap) return;
tilemap += ((bgcnt & 0x0700) << 2);
if (extpal)
{
pal = (u16*)GPU::VRAM_ABGExtPal[bgnum];
// derp
if (!pal) pal = (u16*)&GPU::Palette[0];
}
else
pal = (u16*)&GPU::Palette[0];
}
u16 curtile;
u16* curpal;
u8* pixels;
s16 rotA = BGRotA[bgnum-2];
s16 rotB = BGRotB[bgnum-2];
s16 rotC = BGRotC[bgnum-2];
s16 rotD = BGRotD[bgnum-2];
s32 rotX = BGXCenter[bgnum-2];
s32 rotY = BGYCenter[bgnum-2];
// hax
rotX += line*rotB;
rotY += line*rotD;
if (bgcnt & 0x0080)
{
// bitmap modes
// TODO
}
else
{
// shitty mode
for (int i = 0; i < 256; i++)
{
curtile = tilemap[((rotY & 0x1F800) >> 5) + ((rotY & wideymask) >> 6) +
((rotX & 0xF800) >> 11) + ((rotX & widexmask) >> 6)];
curpal = pal;
if (extpal) curpal += ((curtile & 0xF000) >> 4);
pixels = tileset + ((curtile & 0x03FF) << 6);
// draw pixel
u8 color;
u32 tilexoff = (rotX >> 8) & 0x7;
u32 tileyoff = (rotY >> 8) & 0x7;
if (curtile & 0x0400) tilexoff = 7-tilexoff;
if (curtile & 0x0800) tileyoff = 7-tileyoff;
color = pixels[(tileyoff << 3) + tilexoff];
if (color)
dst[i] = curpal[color];
rotX += rotA;
rotY += rotC;
}
}
//BGXCenter[bgnum-2] += rotB;
//BGYCenter[bgnum-2] += rotD;
}
void GPU2D::InterleaveSprites(u32* buf, u32 prio, u16* dst)
{
for (u32 i = 0; i < 256; i++)
@ -475,7 +611,6 @@ void GPU2D::DrawSprites(u32 line, u32* dst)
u32 rotparamgroup = (attrib[1] >> 9) & 0x1F;
//DrawSprite_Normal(attrib, width, xpos, ypos, dst);
DrawSprite_Rotscale(attrib, &oam[(rotparamgroup*16) + 3], boundwidth, boundheight, width, height, xpos, ypos, dst);
}
else

10
GPU2D.h
View File

@ -48,10 +48,18 @@ private:
u16 BGXPos[4];
u16 BGYPos[4];
s32 BGXCenter[2];
s32 BGYCenter[2];
s16 BGRotA[2];
s16 BGRotB[2];
s16 BGRotC[2];
s16 BGRotD[2];
template<u32 bgmode> void DrawScanlineBGMode(u32 line, u32* spritebuf, u16* dst);
void DrawScanline_Mode1(u32 line, u16* dst);
void DrawBG_Text_4bpp(u32 line, u16* dst, u32 num);
void DrawBG_Text(u32 line, u16* dst, u32 num);
void DrawBG_Extended(u32 line, u16* dst, u32 bgnum);
void InterleaveSprites(u32* buf, u32 prio, u16* dst);
void DrawSprites(u32 line, u32* dst);

6
melonDS.depend
View File

@ -86,13 +86,13 @@
"NDS.h"
"SPI.h"
1485990245 source:c:\documents\sources\melonds\gpu2d.cpp
1485993754 source:c:\documents\sources\melonds\gpu2d.cpp
<stdio.h>
<string.h>
"NDS.h"
"GPU.h"
1485985325 c:\documents\sources\melonds\gpu2d.h
1485991372 c:\documents\sources\melonds\gpu2d.h
1481040524 c:\documents\sources\melonds\wifi.h
@ -117,7 +117,7 @@
1484698068 c:\documents\sources\melonds\dma.h
"types.h"
1485989904 source:c:\documents\sources\melonds\gpu.cpp
1485990504 source:c:\documents\sources\melonds\gpu.cpp
<stdio.h>
<string.h>
"NDS.h"