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Reimplement line clipping

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This commit is contained in:
Pokechu22 2022-10-29 13:34:04 -07:00
parent e693c52528
commit 061ee4cda8
1 changed files with 47 additions and 0 deletions
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47
Source/Core/VideoBackends/Software/Clipper.cpp
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@ -513,6 +513,53 @@ static void CopyLineVertex(OutputVertexData* dst, const OutputVertexData* src, i
void ProcessLine(OutputVertexData* v0, OutputVertexData* v1)
{
// TODO: How does clipping for lines work? For now, I'm just using the main radius (no guardband).
ClipPlaneResult cr0 = CheckClipPlanes(v0, MAIN_RADIUS);
ClipPlaneResult cr1 = CheckClipPlanes(v1, MAIN_RADIUS);
if ((cr0.planes & cr1.planes) != ClipPlane::None)
{
// Trivially rejected
return;
}
OutputVertexData nv0 = *v0;
OutputVertexData nv1 = *v1;
if ((cr0.planes | cr1.planes) != ClipPlane::None)
{
// Clipping is needed
float a0 = 0;
float a1 = 1;
auto process_plane = [&](ClipPlane plane, float ClipPlaneResult::*member_pointer) {
if ((cr0.planes & plane) == plane)
a0 = std::max(a0, ComputeIntersection(cr0.*member_pointer, cr1.*member_pointer));
else if ((cr1.planes & plane) == plane)
a1 = std::min(a1, ComputeIntersection(cr0.*member_pointer, cr1.*member_pointer));
};
process_plane(ClipPlane::PositiveX, &ClipPlaneResult::positive_x);
process_plane(ClipPlane::NegativeX, &ClipPlaneResult::negative_x);
process_plane(ClipPlane::PositiveY, &ClipPlaneResult::positive_y);
process_plane(ClipPlane::NegativeY, &ClipPlaneResult::negative_y);
process_plane(ClipPlane::PositiveZ, &ClipPlaneResult::positive_z);
process_plane(ClipPlane::NegativeZ, &ClipPlaneResult::negative_z);
if (a0 >= a1)
{
// Nontrivial rejection
return;
}
if (a0 != 0)
nv0.Lerp(a0, v0, v1);
if (a1 != 1)
nv1.Lerp(a1, v0, v1);
v0 = &nv0;
v1 = &nv1;
}
PerspectiveDivide(v0);
PerspectiveDivide(v1);