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melonDS/GPU3D_Soft.cpp

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/*
Copyright 2016-2017 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"
namespace GPU3D
{
namespace SoftRenderer
{
u32 ColorBuffer[256*192];
u32 DepthBuffer[256*192];
bool Init()
{
return true;
}
void DeInit()
{
//
}
void Reset()
{
memset(ColorBuffer, 0, 256*192 * 4);
memset(DepthBuffer, 0, 256*192 * 4);
}
void TextureLookup(u32 texparam, u32 texpal, s16 s, s16 t, u8* r, u8* g, u8* b)
{
u32 vramaddr = (texparam & 0xFFFF) << 3;
u32 width = 8 << ((texparam >> 20) & 0x7);
u32 height = 8 << ((texparam >> 23) & 0x7);
s >>= 4;
t >>= 4;
// texture wrapping
// TODO: optimize this somehow
if (texparam & (1<<16))
{
if (texparam & (1<<18))
{
if (s & width) s = (width-1) - (s & (width-1));
else s = (s & (width-1));
}
else
s &= width-1;
}
else
{
if (s < 0) s = 0;
else if (s >= width) s = width-1;
}
if (texparam & (1<<17))
{
if (texparam & (1<<19))
{
if (t & height) t = (height-1) - (t & (height-1));
else t = (t & (height-1));
}
else
t &= height-1;
}
else
{
if (t < 0) t = 0;
else if (t >= height) t = height-1;
}
switch ((texparam >> 26) & 0x7)
{
case 3: // 16-color
{
vramaddr += (((t * width) + s) >> 1);
u8 pixel = GPU::ReadVRAM_Texture<u8>(vramaddr);
if (s & 0x1) pixel >>= 4;
else pixel &= 0xF;
texpal <<= 4;
u16 color = GPU::ReadVRAM_TexPal<u16>(texpal + (pixel<<1));
*r = (color << 1) & 0x3E; if (*r) *r++;
*g = (color >> 4) & 0x3E; if (*g) *g++;
*b = (color >> 9) & 0x3E; if (*b) *b++;
}
break;
case 4: // 256-color
{
vramaddr += ((t * width) + s);
u8 pixel = GPU::ReadVRAM_Texture<u8>(vramaddr);
texpal <<= 4;
u16 color = GPU::ReadVRAM_TexPal<u16>(texpal + (pixel<<1));
*r = (color << 1) & 0x3E; if (*r) *r++;
*g = (color >> 4) & 0x3E; if (*g) *g++;
*b = (color >> 9) & 0x3E; if (*b) *b++;
}
break;
case 7: // direct color
{
vramaddr += (((t * width) + s) << 1);
u16 color = GPU::ReadVRAM_Texture<u16>(vramaddr);
*r = (color << 1) & 0x3E; if (*r) *r++;
*g = (color >> 4) & 0x3E; if (*g) *g++;
*b = (color >> 9) & 0x3E; if (*b) *b++;
}
break;
case 5: // compressed
{
vramaddr += ((t & 0x3FC) * (width>>2)) + (s & 0x3FC);
vramaddr += (t & 0x3);
u32 slot1addr = 0x20000 + ((vramaddr & 0x1FFFC) >> 1);
if (vramaddr >= 0x40000)
slot1addr += 0x10000;
u8 val = GPU::ReadVRAM_Texture<u8>(vramaddr);
val >>= (2 * (s & 0x3));
u16 palinfo = GPU::ReadVRAM_Texture<u16>(slot1addr);
u32 paloffset = (palinfo & 0x3FFF) << 2;
texpal <<= 4;
u16 color;
switch (val & 0x3)
{
case 0:
color = GPU::ReadVRAM_TexPal<u16>(texpal + paloffset);
break;
case 1:
color = GPU::ReadVRAM_TexPal<u16>(texpal + paloffset + 2);
break;
case 2:
if ((palinfo >> 14) == 1)
{
u16 color0 = GPU::ReadVRAM_TexPal<u16>(texpal + paloffset);
u16 color1 = GPU::ReadVRAM_TexPal<u16>(texpal + paloffset + 2);
u32 r0 = color0 & 0x001F;
u32 g0 = color0 & 0x03E0;
u32 b0 = color0 & 0x7C00;
u32 r1 = color1 & 0x001F;
u32 g1 = color1 & 0x03E0;
u32 b1 = color1 & 0x7C00;
u32 r = (r0 + r1) >> 1;
u32 g = ((g0 + g1) >> 1) & 0x03E0;
u32 b = ((b0 + b1) >> 1) & 0x7C00;
color = r | g | b;
}
else if ((palinfo >> 14) == 3)
{
u16 color0 = GPU::ReadVRAM_TexPal<u16>(texpal + paloffset);
u16 color1 = GPU::ReadVRAM_TexPal<u16>(texpal + paloffset + 2);
u32 r0 = color0 & 0x001F;
u32 g0 = color0 & 0x03E0;
u32 b0 = color0 & 0x7C00;
u32 r1 = color1 & 0x001F;
u32 g1 = color1 & 0x03E0;
u32 b1 = color1 & 0x7C00;
u32 r = (r0*5 + r1*3) >> 3;
u32 g = ((g0*5 + g1*3) >> 3) & 0x03E0;
u32 b = ((b0*5 + b1*3) >> 3) & 0x7C00;
color = r | g | b;
}
else
color = GPU::ReadVRAM_TexPal<u16>(texpal + paloffset + 4);
break;
case 3:
if ((palinfo >> 14) == 2)
color = GPU::ReadVRAM_TexPal<u16>(texpal + paloffset + 6);
else if ((palinfo >> 14) == 3)
{
u16 color0 = GPU::ReadVRAM_TexPal<u16>(texpal + paloffset);
u16 color1 = GPU::ReadVRAM_TexPal<u16>(texpal + paloffset + 2);
u32 r0 = color0 & 0x001F;
u32 g0 = color0 & 0x03E0;
u32 b0 = color0 & 0x7C00;
u32 r1 = color1 & 0x001F;
u32 g1 = color1 & 0x03E0;
u32 b1 = color1 & 0x7C00;
u32 r = (r0*3 + r1*5) >> 3;
u32 g = ((g0*3 + g1*5) >> 3) & 0x03E0;
u32 b = ((b0*3 + b1*5) >> 3) & 0x7C00;
color = r | g | b;
}
else
color = 0; // TODO transparent!
break;
}
*r = (color << 1) & 0x3E; if (*r) *r++;
*g = (color >> 4) & 0x3E; if (*g) *g++;
*b = (color >> 9) & 0x3E; if (*b) *b++;
}
break;
default:
*r = (s)&0x3F;
*g = 0;
*b = (t)&0x3F;
break;
}
}
void RenderPixel(Polygon* polygon, s32 x, s32 y, s32 z, u8 vr, u8 vg, u8 vb, s16 s, s16 t)
{
u32 attr = polygon->Attr;
u32* color = &ColorBuffer[(256*y) + x];
u32* depth = &DepthBuffer[(256*y) + x];
bool passdepth = false;
if (attr & (1<<14))
{
s32 diff = *depth - z;
if ((u32)(diff + 0x200) <= 0x400)
passdepth = true;
}
else
if (z < *depth)
passdepth = true;
if (!passdepth) return;
u8 r, g, b;
if (((polygon->TexParam >> 26) & 0x7) != 0)
{
// TODO: also take DISP3DCNT into account
u8 tr, tg, tb;
TextureLookup(polygon->TexParam, polygon->TexPalette, s, t, &tr, &tg, &tb);
// TODO: other blending modes
/*r = ((tr+1) * (vr+1) - 1) >> 6;
g = ((tg+1) * (vg+1) - 1) >> 6;
b = ((tb+1) * (vb+1) - 1) >> 6;*/
r = tr;
g = tg;
b = tb;
}
else
{
r = vr;
g = vg;
b = vb;
}
u32 a = 31; // TODO
*color = r | (g << 8) | (b << 16) | (a << 24);
// TODO: optional update for translucent pixels
if (z > 0xFFFFFF) z = 0xFFFFFF;
*depth = z;
}
void RenderPolygon(Polygon* polygon, u32 wbuffer)
{
int nverts = polygon->NumVertices;
bool isline = false;
int vtop = 0, vbot = 0;
s32 ytop = 192, ybot = 0;
s32 xtop = 256, xbot = 0;
// process the vertices, transform to screen coordinates
// find the topmost and bottommost vertices of the polygon
for (int i = 0; i < nverts; i++)
{
Vertex* vtx = polygon->Vertices[i];
if (!vtx->ViewportTransformDone)
{
s32 posX, posY, posZ;
s32 w = vtx->Position[3];
if (w == 0)
{
posX = 0;
posY = 0;
posZ = 0;
w = 0x1000;
}
else
{
posX = ((s64)vtx->Position[0] << 12) / w;
posY = ((s64)vtx->Position[1] << 12) / w;
if (wbuffer) posZ = w;
else posZ = (((s64)vtx->Position[2] * 0x800000) / w) + 0x7FFEFF;
}
s32 scrX = (((posX + 0x1000) * Viewport[2]) >> 13) + Viewport[0];
s32 scrY = ((0x180000 - ((posY + 0x1000) * Viewport[3])) >> 13) + Viewport[1];
if (scrX < 0) scrX = 0;
else if (scrX > 256) scrX = 256;
if (scrY < 0) scrY = 0;
else if (scrY > 192) scrY = 192;
if (posZ < 0) posZ = 0;
else if (posZ > 0xFFFFFF) posZ = 0xFFFFFF;
vtx->FinalPosition[0] = scrX;
vtx->FinalPosition[1] = scrY;
vtx->FinalPosition[2] = posZ;
vtx->FinalPosition[3] = w;
vtx->FinalColor[0] = vtx->Color[0] >> 12;
if (vtx->FinalColor[0]) vtx->FinalColor[0] = ((vtx->FinalColor[0] << 4) + 0xF);
vtx->FinalColor[1] = vtx->Color[1] >> 12;
if (vtx->FinalColor[1]) vtx->FinalColor[1] = ((vtx->FinalColor[1] << 4) + 0xF);
vtx->FinalColor[2] = vtx->Color[2] >> 12;
if (vtx->FinalColor[2]) vtx->FinalColor[2] = ((vtx->FinalColor[2] << 4) + 0xF);
vtx->ViewportTransformDone = true;
}
if (vtx->FinalPosition[1] < ytop || (vtx->FinalPosition[1] == ytop && vtx->FinalPosition[0] < xtop))
{
xtop = vtx->FinalPosition[0];
ytop = vtx->FinalPosition[1];
vtop = i;
}
if (vtx->FinalPosition[1] > ybot || (vtx->FinalPosition[1] == ybot && vtx->FinalPosition[0] > xbot))
{
xbot = vtx->FinalPosition[0];
ybot = vtx->FinalPosition[1];
vbot = i;
}
//printf("v%d: %d,%d\n", i, vtx->FinalPosition[0], vtx->FinalPosition[1]);
}
// draw, line per line
int lcur = vtop, rcur = vtop;
int lnext, rnext;
if (ybot == ytop)
{
ybot++;
isline = true;
vtop = 0; vbot = 0;
xtop = 256; xbot = 0;
int i;
i = 1;
if (polygon->Vertices[i]->FinalPosition[0] < polygon->Vertices[vtop]->FinalPosition[0]) vtop = i;
if (polygon->Vertices[i]->FinalPosition[0] > polygon->Vertices[vbot]->FinalPosition[0]) vbot = i;
i = nverts - 1;
if (polygon->Vertices[i]->FinalPosition[0] < polygon->Vertices[vtop]->FinalPosition[0]) vtop = i;
if (polygon->Vertices[i]->FinalPosition[0] > polygon->Vertices[vbot]->FinalPosition[0]) vbot = i;
lcur = vtop; lnext = vtop;
rcur = vbot; rnext = vbot;
}
else
{
if (polygon->FacingView)
{
lnext = lcur + 1;
if (lnext >= nverts) lnext = 0;
rnext = rcur - 1;
if (rnext < 0) rnext = nverts - 1;
}
else
{
lnext = lcur - 1;
if (lnext < 0) lnext = nverts - 1;
rnext = rcur + 1;
if (rnext >= nverts) rnext = 0;
}
}
for (s32 y = ytop; y < ybot; y++)
{
if (y > 191) break;
if (!isline)
{
while (y >= polygon->Vertices[lnext]->FinalPosition[1] && lcur != vbot)
{
lcur = lnext;
if (polygon->FacingView)
{
lnext = lcur + 1;
if (lnext >= nverts) lnext = 0;
}
else
{
lnext = lcur - 1;
if (lnext < 0) lnext = nverts - 1;
}
}
while (y >= polygon->Vertices[rnext]->FinalPosition[1] && rcur != vbot)
{
rcur = rnext;
if (polygon->FacingView)
{
rnext = rcur - 1;
if (rnext < 0) rnext = nverts - 1;
}
else
{
rnext = rcur + 1;
if (rnext >= nverts) rnext = 0;
}
}
}
Vertex* vlcur = polygon->Vertices[lcur];
Vertex* vlnext = polygon->Vertices[lnext];
Vertex* vrcur = polygon->Vertices[rcur];
Vertex* vrnext = polygon->Vertices[rnext];
s32 lfactor, rfactor;
// TODO: work out the actual division bias there. 0x400 was found to make things look good.
// but actually, it isn't right. so what's going on there?
// seems vertical slopes are interpolated starting from the bottom and not the top. maybe.
// also seems lfactor/rfactor are rounded
// TODO: the calculations can be simplified
if (vlnext->FinalPosition[1] == vlcur->FinalPosition[1])
lfactor = 0;
else
lfactor = (((y+1 - vlcur->FinalPosition[1]) << 12) + 0x00) / (vlnext->FinalPosition[1] - vlcur->FinalPosition[1]);
if (vrnext->FinalPosition[1] == vrcur->FinalPosition[1])
rfactor = 0;
else
rfactor = (((y+1 - vrcur->FinalPosition[1]) << 12) + 0x00) / (vrnext->FinalPosition[1] - vrcur->FinalPosition[1]);
s32 xl = vlcur->FinalPosition[0] + ((((vlnext->FinalPosition[0] - vlcur->FinalPosition[0]) * lfactor) + 0x800) >> 12);
s32 xr = vrcur->FinalPosition[0] + ((((vrnext->FinalPosition[0] - vrcur->FinalPosition[0]) * rfactor) + 0x800) >> 12);
//printf("y:%d xl:%d xr:%d %08X\n", y, xl, xr, rfactor); // y: 48 143
if (xl > xr) // TODO: handle it in a more elegant way
{
Vertex* vtmp;
s32 tmp;
vtmp = vlcur; vlcur = vrcur; vrcur = vtmp;
vtmp = vlnext; vlnext = vrnext; vrnext = vtmp;
tmp = lfactor; lfactor = rfactor; rfactor = tmp;
tmp = xl; xl = xr; xr = tmp;
}
if (xl<0 || xr>256)
{
printf("!! BAD X %d %d\n", xl, xr);
continue; // hax
}
s64 perspfactorl1 = ((s64)(0x1000 - lfactor) * vlnext->FinalPosition[3]) >> 12;
s64 perspfactorl2 = ((s64)lfactor * vlcur->FinalPosition[3]) >> 12;
s64 perspfactorr1 = ((s64)(0x1000 - rfactor) * vrnext->FinalPosition[3]) >> 12;
s64 perspfactorr2 = ((s64)rfactor * vrcur->FinalPosition[3]) >> 12;
if (perspfactorl1 + perspfactorl2 == 0)
{
perspfactorl1 = 0x1000;
perspfactorl2 = 0;
}
if (perspfactorr1 + perspfactorr2 == 0)
{
perspfactorr1 = 0x1000;
perspfactorr2 = 0;
}
s32 zl = ((perspfactorl1 * vlcur->FinalPosition[2]) + (perspfactorl2 * vlnext->FinalPosition[2])) / (perspfactorl1 + perspfactorl2);
s32 zr = ((perspfactorr1 * vrcur->FinalPosition[2]) + (perspfactorr2 * vrnext->FinalPosition[2])) / (perspfactorr1 + perspfactorr2);
s32 wl = ((perspfactorl1 * vlcur->FinalPosition[3]) + (perspfactorl2 * vlnext->FinalPosition[3])) / (perspfactorl1 + perspfactorl2);
s32 wr = ((perspfactorr1 * vrcur->FinalPosition[3]) + (perspfactorr2 * vrnext->FinalPosition[3])) / (perspfactorr1 + perspfactorr2);
s32 rl = ((perspfactorl1 * vlcur->FinalColor[0]) + (perspfactorl2 * vlnext->FinalColor[0])) / (perspfactorl1 + perspfactorl2);
s32 gl = ((perspfactorl1 * vlcur->FinalColor[1]) + (perspfactorl2 * vlnext->FinalColor[1])) / (perspfactorl1 + perspfactorl2);
s32 bl = ((perspfactorl1 * vlcur->FinalColor[2]) + (perspfactorl2 * vlnext->FinalColor[2])) / (perspfactorl1 + perspfactorl2);
s32 sl = ((perspfactorl1 * vlcur->TexCoords[0]) + (perspfactorl2 * vlnext->TexCoords[0])) / (perspfactorl1 + perspfactorl2);
s32 tl = ((perspfactorl1 * vlcur->TexCoords[1]) + (perspfactorl2 * vlnext->TexCoords[1])) / (perspfactorl1 + perspfactorl2);
s32 rr = ((perspfactorr1 * vrcur->FinalColor[0]) + (perspfactorr2 * vrnext->FinalColor[0])) / (perspfactorr1 + perspfactorr2);
s32 gr = ((perspfactorr1 * vrcur->FinalColor[1]) + (perspfactorr2 * vrnext->FinalColor[1])) / (perspfactorr1 + perspfactorr2);
s32 br = ((perspfactorr1 * vrcur->FinalColor[2]) + (perspfactorr2 * vrnext->FinalColor[2])) / (perspfactorr1 + perspfactorr2);
s32 sr = ((perspfactorr1 * vrcur->TexCoords[0]) + (perspfactorr2 * vrnext->TexCoords[0])) / (perspfactorr1 + perspfactorr2);
s32 tr = ((perspfactorr1 * vrcur->TexCoords[1]) + (perspfactorr2 * vrnext->TexCoords[1])) / (perspfactorr1 + perspfactorr2);
if (xr == xl) xr++;
// temp.
if (xl > 255) continue;
//s32 xdiv = 0x1000 / (xr - xl);
//s32 xdiv = 0x100000 / (xr - xl);
for (s32 x = xl; x < xr; x++)
{
//if (x!=xl && x!=(xr-1)) continue;
s32 xfactor = ((x - xl) << 12) / (xr - xl);
//s32 xfactor = (x - xl) * xdiv;
//s32 xfactor = ((x - xl) * xdiv) >> 8;
s32 perspfactor1 = ((s64)(0x1000 - xfactor) * wr) >> 12;
s32 perspfactor2 = ((s64)xfactor * wl) >> 12;
if (perspfactor1 + perspfactor2 == 0)
{
perspfactor1 = 0x1000;
perspfactor2 = 0;
}
s32 z = ((perspfactor1 * (s64)zl) + (perspfactor2 * (s64)zr)) / (perspfactor1 + perspfactor2);
// possible optimization: only do color interpolation if the depth test passes
u32 vr = ((perspfactor1 * rl) + (perspfactor2 * rr)) / (perspfactor1 + perspfactor2);
u32 vg = ((perspfactor1 * gl) + (perspfactor2 * gr)) / (perspfactor1 + perspfactor2);
u32 vb = ((perspfactor1 * bl) + (perspfactor2 * br)) / (perspfactor1 + perspfactor2);
s16 s = ((perspfactor1 * (s64)sl) + (perspfactor2 * (s64)sr)) / (perspfactor1 + perspfactor2);
s16 t = ((perspfactor1 * (s64)tl) + (perspfactor2 * (s64)tr)) / (perspfactor1 + perspfactor2);
RenderPixel(polygon, x, y, z, vr>>3, vg>>3, vb>>3, s, t);
}
}
}
void RenderFrame(u32 attr, Vertex* vertices, Polygon* polygons, int npolys)
{
// TODO: render translucent polygons last
// TODO proper clear color/depth support!
for (int i = 0; i < 256*192; i++)
{
ColorBuffer[i] = 0x00000000;
DepthBuffer[i] = 0xFFFFFF;
}
for (int i = 0; i < npolys; i++)
{
RenderPolygon(&polygons[i], attr&0x2);
}
}
u32* GetLine(int line)
{
return &ColorBuffer[line * 256];
}
}
}
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