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overdrawanalyzer: Simplify depth code

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Instead of selecting a Z or reverse Z value in the inner loop, adjust
the logic outside of the loop so that it naturally comes out flipped.
This commit is contained in:
Arseny Kapoulkine
2017-05-19 08:35:01 -07:00
parent 92b07f5698
commit 41dc6de3da
1 changed files with 8 additions and 4 deletions
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src/overdrawanalyzer.cpp
+8 -4
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@@ -55,9 +55,15 @@ namespace
// flip backfacing triangles to simplify rasterization logic
if (sign)
{
// flipping v2 & v3 preserves depth gradients since they're based on v1
std::swap(v2x, v3x);
std::swap(v2y, v3y);
std::swap(v2z, v3z);
// flip depth since we rasterize backfacing triangles to second buffer with reverse Z; only v1z is used below
v1z = kViewport - v1z;
DZx = -DZx;
DZy = -DZy;
}
// coordinates, 28.4 fixed point
@@ -107,11 +113,9 @@ namespace
// check if all CXn are non-negative
if ((CX1 | CX2 | CX3) >= 0)
{
float z = sign ? kViewport - ZX : ZX;
if (z >= buffer->z[y][x][sign])
if (ZX >= buffer->z[y][x][sign])
{
buffer->z[y][x][sign] = z;
buffer->z[y][x][sign] = ZX;
buffer->overdraw[y][x][sign]++;
}
}