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* backface/frontface culling (and rendering of backfacing polygons)

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* fix clipping/viewport transform precision errors
* triangle/quad strips
This commit is contained in:
StapleButter
2017-02-14 02:43:35 +01:00
parent fb53fd5195
commit 68fb77b204
6 changed files with 323 additions and 161 deletions
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92
GPU3D_Soft.cpp
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@ -60,23 +60,27 @@ void RenderPolygon(Polygon* polygon)
{
Vertex* vtx = polygon->Vertices[i];
s32 w_inv;
if (vtx->Position[3] == 0)
s32 posX, posY, posZ;
s32 w = vtx->Position[3];
if (w == 0)
{
w_inv = 0x1000; // checkme
printf("!! W=0\n");
posX = 0;
posY = 0;
posZ = 0;
}
else
w_inv = 0x1000000 / vtx->Position[3];
if (vtx->Position[3] < 0) printf("!!! W=%d\n", vtx->Position[3]);
s32 posX = (vtx->Position[0] * w_inv) >> 12;
s32 posY = (vtx->Position[1] * w_inv) >> 12;
s32 posZ = (vtx->Position[2] * w_inv) >> 12;
{
// TODO: find a way to avoid doing 3 divisions :/
posX = ((s64)vtx->Position[0] << 12) / w;
posY = ((s64)vtx->Position[1] << 12) / w;
posZ = ((s64)vtx->Position[2] << 12) / w;
}
//s32 posX = vtx->Position[0];
//s32 posY = vtx->Position[1];
//printf("xy: %08X %08X %08X\n", vtx->Position[0], vtx->Position[1], vtx->Position[3]);
//printf("w_inv: %08X res: %08X %08X\n", w_inv, posX, posY);
s32 scrX = (((posX + 0x1000) * Viewport[2]) >> 13) + Viewport[0];
s32 scrY = (((posY + 0x1000) * Viewport[3]) >> 13) + Viewport[1];
s32 scrZ = (vtx->Position[2] + 0x1000) >> 1;
@ -102,7 +106,8 @@ void RenderPolygon(Polygon* polygon)
vbot = i;
}
//if (vtx->Color[0]==63 && vtx->Color[1]==0 && vtx->Color[2]==0)
//printf("v%d: %d,%d Z=%f W=%f\n", i, scrX, 191-scrY, vtx->Position[2]/4096.0f, vtx->Position[3]/4096.0f);
//printf("v%d: %d,%d Z=%f W=%f %d %d\n", i, scrX, 191-scrY, vtx->Position[2]/4096.0f, vtx->Position[3]/4096.0f,
// polygon->FacingView, vtx->Clipped);
}
// draw, line per line
@ -112,10 +117,20 @@ void RenderPolygon(Polygon* polygon)
s32 lstep, rstep;
//s32 xmin, xmax;
lnext = lcur + 1;
if (lnext >= nverts) lnext = 0;
rnext = rcur - 1;
if (rnext < 0) rnext = nverts - 1;
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;
}
/*if ((scrcoords[lnext][1] - scrcoords[lcur][1]) == 0) lstep = 0; else
lstep = ((scrcoords[lnext][0] - scrcoords[lcur][0]) << 12) / (scrcoords[lnext][1] - scrcoords[lcur][1]);
@ -131,11 +146,18 @@ void RenderPolygon(Polygon* polygon)
{
while (y == scrcoords[lnext][1])
{
lcur++;
if (lcur >= nverts) lcur = 0;
lcur = lnext;
lnext = lcur + 1;
if (lnext >= nverts) lnext = 0;
if (polygon->FacingView)
{
lnext = lcur + 1;
if (lnext >= nverts) lnext = 0;
}
else
{
lnext = lcur - 1;
if (lnext < 0) lnext = nverts - 1;
}
//lstep = ((scrcoords[lnext][0] - scrcoords[lcur][0]) << 12) / (scrcoords[lnext][1] - scrcoords[lcur][1]);
//xmin = scrcoords[lcur][0] << 12;
@ -144,11 +166,18 @@ void RenderPolygon(Polygon* polygon)
while (y == scrcoords[rnext][1])
{
rcur--;
if (rcur < 0) rcur = nverts - 1;
rcur = rnext;
rnext = rcur - 1;
if (rnext < 0) rnext = nverts - 1;
if (polygon->FacingView)
{
rnext = rcur - 1;
if (rnext < 0) rnext = nverts - 1;
}
else
{
rnext = rcur + 1;
if (rnext >= nverts) rnext = 0;
}
//rstep = ((scrcoords[rnext][0] - scrcoords[rcur][0]) << 12) / (scrcoords[rnext][1] - scrcoords[rcur][1]);
//xmax = scrcoords[rcur][0] << 12;
@ -232,6 +261,19 @@ void RenderPolygon(Polygon* polygon)
pixel[2] = zerp;*/
}
}
// DEBUG CODE
/*for (int i = 0; i < nverts; i++)
{
s32 x = scrcoords[i][0];
s32 y = scrcoords[i][1];
u8* pixel = &ColorBuffer[((256*y) + x) * 4];
pixel[0] = 63;
pixel[1] = 63;
pixel[2] = 63;
pixel[3] = 31;
}*/
}
void RenderFrame(Vertex* vertices, Polygon* polygons, int npolys)
@ -253,6 +295,8 @@ void RenderFrame(Vertex* vertices, Polygon* polygons, int npolys)
polygons[i].Vertices[j]->Position[1]/4096.0f,
polygons[i].Vertices[j]->Position[2]/4096.0f);
*/
//printf("polygon %d\n", i);
//if (!polygons[i].Vertices[0]->Clipped) continue;
//printf("polygon %d\n", i);
RenderPolygon(&polygons[i]);
}