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3D/GL: make polygon generation code cleaner, add quicker codepath for triangles (also laying ground for some evil experiment) 

also fix stupid bug with line polygons
This commit is contained in:
Arisotura 2020-08-19 13:02:54 +02:00
parent a32d997e1c
commit de19ce6250
1 changed files with 64 additions and 64 deletions
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128
src/GPU3D_OpenGL.cpp
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@ -527,6 +527,46 @@ void SetupPolygon(RendererPolygon* rp, Polygon* polygon)
} }
} }
u32* SetupVertex(Polygon* poly, int vid, Vertex* vtx, u32 vtxattr, u32* vptr)
{
u32 z = poly->FinalZ[vid];
u32 w = poly->FinalW[vid];
u32 alpha = (poly->Attr >> 16) & 0x1F;
// Z should always fit within 16 bits, so it's okay to do this
u32 zshift = 0;
while (z > 0xFFFF) { z >>= 1; zshift++; }
u32 x, y;
if (ScaleFactor > 1)
{
x = (vtx->HiresPosition[0] * ScaleFactor) >> 4;
y = (vtx->HiresPosition[1] * ScaleFactor) >> 4;
}
else
{
x = vtx->FinalPosition[0];
y = vtx->FinalPosition[1];
}
*vptr++ = x | (y << 16);
*vptr++ = z | (w << 16);
*vptr++ = (vtx->FinalColor[0] >> 1) |
((vtx->FinalColor[1] >> 1) << 8) |
((vtx->FinalColor[2] >> 1) << 16) |
(alpha << 24);
*vptr++ = (u16)vtx->TexCoords[0] | ((u16)vtx->TexCoords[1] << 16);
*vptr++ = vtxattr | (zshift << 16);
*vptr++ = poly->TexParam;
*vptr++ = poly->TexPalette;
return vptr;
}
void BuildPolygons(RendererPolygon* polygons, int npolys) void BuildPolygons(RendererPolygon* polygons, int npolys)
{ {
u32* vptr = &VertexBuffer[0]; u32* vptr = &VertexBuffer[0];
@ -564,43 +604,16 @@ void BuildPolygons(RendererPolygon* polygons, int npolys)
{ {
Vertex* vtx = poly->Vertices[j]; Vertex* vtx = poly->Vertices[j];
u32 z = poly->FinalZ[j];
u32 w = poly->FinalW[j];
// Z should always fit within 16 bits, so it's okay to do this
u32 zshift = 0;
while (z > 0xFFFF) { z >>= 1; zshift++; }
u32 x, y;
if (ScaleFactor > 1)
{
x = (vtx->HiresPosition[0] * ScaleFactor) >> 4;
y = (vtx->HiresPosition[1] * ScaleFactor) >> 4;
}
else
{
x = vtx->FinalPosition[0];
y = vtx->FinalPosition[1];
}
if (j > 0) if (j > 0)
{ {
if (lastx == x && lasty == y) continue; if (lastx == vtx->FinalPosition[0] &&
lasty == vtx->FinalPosition[1]) continue;
} }
*vptr++ = x | (y << 16); lastx = vtx->FinalPosition[0];
*vptr++ = z | (w << 16); lasty = vtx->FinalPosition[1];
*vptr++ = (vtx->FinalColor[0] >> 1) | vptr = SetupVertex(poly, j, vtx, vtxattr, vptr);
((vtx->FinalColor[1] >> 1) << 8) |
((vtx->FinalColor[2] >> 1) << 16) |
(alpha << 24);
*vptr++ = (u16)vtx->TexCoords[0] | ((u16)vtx->TexCoords[1] << 16);
*vptr++ = vtxattr | (zshift << 16);
*vptr++ = poly->TexParam;
*vptr++ = poly->TexPalette;
*iptr++ = vidx; *iptr++ = vidx;
rp->NumIndices++; rp->NumIndices++;
@ -610,6 +623,24 @@ void BuildPolygons(RendererPolygon* polygons, int npolys)
if (nout >= 2) break; if (nout >= 2) break;
} }
} }
else if (poly->NumVertices == 3) // regular triangle
{
rp->PrimType = GL_TRIANGLES;
for (int j = 0; j < 3; j++)
{
Vertex* vtx = poly->Vertices[j];
vptr = SetupVertex(poly, j, vtx, vtxattr, vptr);
vidx++;
}
// build a triangle
*iptr++ = vidx_first;
*iptr++ = vidx - 2;
*iptr++ = vidx - 1;
rp->NumIndices += 3;
}
else else
{ {
rp->PrimType = GL_TRIANGLES; rp->PrimType = GL_TRIANGLES;
@ -618,38 +649,7 @@ void BuildPolygons(RendererPolygon* polygons, int npolys)
{ {
Vertex* vtx = poly->Vertices[j]; Vertex* vtx = poly->Vertices[j];
u32 z = poly->FinalZ[j]; vptr = SetupVertex(poly, j, vtx, vtxattr, vptr);
u32 w = poly->FinalW[j];
// Z should always fit within 16 bits, so it's okay to do this
u32 zshift = 0;
while (z > 0xFFFF) { z >>= 1; zshift++; }
u32 x, y;
if (ScaleFactor > 1)
{
x = (vtx->HiresPosition[0] * ScaleFactor) >> 4;
y = (vtx->HiresPosition[1] * ScaleFactor) >> 4;
}
else
{
x = vtx->FinalPosition[0];
y = vtx->FinalPosition[1];
}
*vptr++ = x | (y << 16);
*vptr++ = z | (w << 16);
*vptr++ = (vtx->FinalColor[0] >> 1) |
((vtx->FinalColor[1] >> 1) << 8) |
((vtx->FinalColor[2] >> 1) << 16) |
(alpha << 24);
*vptr++ = (u16)vtx->TexCoords[0] | ((u16)vtx->TexCoords[1] << 16);
*vptr++ = vtxattr | (zshift << 16);
*vptr++ = poly->TexParam;
*vptr++ = poly->TexPalette;
if (j >= 2) if (j >= 2)
{ {