diff options
Diffstat (limited to 'GPU3D_Soft.cpp')
| -rw-r--r-- | GPU3D_Soft.cpp | 96 |
1 files changed, 70 insertions, 26 deletions
diff --git a/GPU3D_Soft.cpp b/GPU3D_Soft.cpp index 6ac4e81..abca24a 100644 --- a/GPU3D_Soft.cpp +++ b/GPU3D_Soft.cpp @@ -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; - - lnext = lcur + 1; - if (lnext >= nverts) lnext = 0; + lcur = lnext; + + 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; - - rnext = rcur - 1; - if (rnext < 0) rnext = nverts - 1; + rcur = rnext; + + 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) @@ -254,6 +296,8 @@ void RenderFrame(Vertex* vertices, Polygon* polygons, int npolys) 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]); } } |