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move viewport transform to polygon setup

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This commit is contained in:
StapleButter
2017-03-16 15:55:18 +01:00
parent 1dc887d0bb
commit 7f85a10002
3 changed files with 84 additions and 89 deletions
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80
GPU3D_Soft.cpp
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@ -27,9 +27,6 @@ namespace GPU3D
namespace SoftRenderer
{
u32 DispCnt;
u32 AlphaRef;
u32 ColorBuffer[256*192];
u32 DepthBuffer[256*192];
u32 AttrBuffer[256*192];
@ -336,77 +333,14 @@ u32 RenderPixel(Polygon* polygon, s32 x, s32 y, s32 z, u8 vr, u8 vg, u8 vb, s16
return r | (g << 8) | (b << 16) | (a << 24);
}
void RenderPolygon(Polygon* polygon, u32 wbuffer)
void RenderPolygon(Polygon* polygon)
{
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] + w) * Viewport[2]) / (((s64)w) << 1)) + Viewport[0];
posY = (((s64)(-vtx->Position[1] + w) * Viewport[3]) / (((s64)w) << 1)) + Viewport[1];
if (wbuffer) posZ = w;
else posZ = (((s64)vtx->Position[2] * 0x800000) / w) + 0x7FFEFF;
}
if (posX < 0) posX = 0;
else if (posX > 256) posX = 256;
if (posY < 0) posY = 0;
else if (posY > 192) posY = 192;
if (posZ < 0) posZ = 0;
else if (posZ > 0xFFFFFF) posZ = 0xFFFFFF;
vtx->FinalPosition[0] = posX;
vtx->FinalPosition[1] = posY;
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;
}
}
int vtop = polygon->VTop, vbot = polygon->VBottom;
s32 ytop = polygon->YTop, ybot = polygon->YBottom;
s32 xtop = polygon->XTop, xbot = polygon->XBottom;
if (ytop > 191) return;
@ -837,7 +771,7 @@ void RenderPolygon(Polygon* polygon, u32 wbuffer)
}
}
void RenderFrame(u32 attr, Vertex* vertices, Polygon* polygons, int npolys)
void RenderFrame(Vertex* vertices, Polygon* polygons, int npolys)
{
u32 polyid = (ClearAttr1 >> 24) & 0x3F;
@ -900,13 +834,13 @@ void RenderFrame(u32 attr, Vertex* vertices, Polygon* polygons, int npolys)
for (int i = 0; i < npolys; i++)
{
if (polygons[i].Translucent) continue;
RenderPolygon(&polygons[i], attr&0x2);
RenderPolygon(&polygons[i]);
}
for (int i = 0; i < npolys; i++)
{
if (!polygons[i].Translucent) continue;
RenderPolygon(&polygons[i], attr&0x2);
RenderPolygon(&polygons[i]);
}
}