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3D/GL: experimental attempt at reducing warping on quads, pentagons, etc...

This commit is contained in:
Arisotura 2020-08-19 14:53:42 +02:00
parent de19ce6250
commit 00f33343e4
1 changed files with 115 additions and 11 deletions
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126
src/GPU3D_OpenGL.cpp
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@ -641,26 +641,130 @@ void BuildPolygons(RendererPolygon* polygons, int npolys)
*iptr++ = vidx - 1;
rp->NumIndices += 3;
}
else
else // quad, pentagon, etc
{
rp->PrimType = GL_TRIANGLES;
for (int j = 0; j < poly->NumVertices; j++)
if (false)
{
Vertex* vtx = poly->Vertices[j];
// regular triangle-splitting
vptr = SetupVertex(poly, j, vtx, vtxattr, vptr);
if (j >= 2)
for (int j = 0; j < poly->NumVertices; j++)
{
// build a triangle
*iptr++ = vidx_first;
*iptr++ = vidx - 1;
*iptr++ = vidx;
rp->NumIndices += 3;
Vertex* vtx = poly->Vertices[j];
vptr = SetupVertex(poly, j, vtx, vtxattr, vptr);
if (j >= 2)
{
// build a triangle
*iptr++ = vidx_first;
*iptr++ = vidx - 1;
*iptr++ = vidx;
rp->NumIndices += 3;
}
vidx++;
}
}
else
{
// attempt at 'better' splitting
// this doesn't get rid of the error while splitting a bigger polygon into triangles
// but we can attempt to reduce it
u32 cX = 0, cY = 0;
float cZ = 0;
float cW = 0;
float cR = 0, cG = 0, cB = 0;
float cS = 0, cT = 0;
for (int j = 0; j < poly->NumVertices; j++)
{
Vertex* vtx = poly->Vertices[j];
cX += vtx->HiresPosition[0];
cY += vtx->HiresPosition[1];
float fw = (float)poly->FinalW[j] * poly->NumVertices;
cW += 1.0f / fw;
if (poly->WBuffer) cZ += poly->FinalZ[j] / fw;
else cZ += poly->FinalZ[j];
cR += (vtx->FinalColor[0] >> 1) / fw;
cG += (vtx->FinalColor[1] >> 1) / fw;
cB += (vtx->FinalColor[2] >> 1) / fw;
cS += vtx->TexCoords[0] / fw;
cT += vtx->TexCoords[1] / fw;
}
cX /= poly->NumVertices;
cY /= poly->NumVertices;
cW = 1.0f / cW;
if (poly->WBuffer) cZ *= cW;
else cZ /= poly->NumVertices;
cR *= cW;
cG *= cW;
cB *= cW;
cS *= cW;
cT *= cW;
cX = (cX * ScaleFactor) >> 4;
cY = (cY * ScaleFactor) >> 4;
u32 w = (u32)cW;
u32 z = (u32)cZ;
u32 zshift = 0;
while (z > 0xFFFF) { z >>= 1; zshift++; }
// build center vertex
*vptr++ = cX | (cY << 16);
*vptr++ = z | (w << 16);
*vptr++ = (u32)cR |
((u32)cG << 8) |
((u32)cB << 16) |
(alpha << 24);
*vptr++ = (u16)cS | ((u16)cT << 16);
*vptr++ = vtxattr | (zshift << 16);
*vptr++ = poly->TexParam;
*vptr++ = poly->TexPalette;
vidx++;
// build the final polygon
for (int j = 0; j < poly->NumVertices; j++)
{
Vertex* vtx = poly->Vertices[j];
vptr = SetupVertex(poly, j, vtx, vtxattr, vptr);
if (j >= 1)
{
// build a triangle
*iptr++ = vidx_first;
*iptr++ = vidx - 1;
*iptr++ = vidx;
rp->NumIndices += 3;
}
vidx++;
}
*iptr++ = vidx_first;
*iptr++ = vidx - 1;
*iptr++ = vidx_first + 1;
rp->NumIndices += 3;
}
}