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GPU: Sort line verts to correct bias.

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We want it to consistently go down and right.  This improves Persona 2 UI
significantly (see #3332.)
This commit is contained in:
Unknown W. Brackets 2021-11-02 21:57:00 -07:00
parent a8cbc792d9
commit ec1d980b30
1 changed files with 12 additions and 7 deletions
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19
GPU/Common/SoftwareTransformCommon.cpp
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@ -792,17 +792,22 @@ void SoftwareTransform::ExpandLines(int vertexCount, int &maxIndex, u16 *&inds,
maxIndex = 4 * (vertexCount / 2);
for (int i = 0; i < vertexCount; i += 2) {
const TransformedVertex &transVtxTL = transformed[indsIn[i + 0]];
TransformedVertex transVtxBL = transformed[indsIn[i + 1]];
const TransformedVertex &transVtx1 = transformed[indsIn[i + 0]];
const TransformedVertex &transVtx2 = transformed[indsIn[i + 1]];
// Okay, let's calculate the perpendicular biased toward the bottom right.
const TransformedVertex &transVtxT = transVtx1.y <= transVtx2.y ? transVtx1 : transVtx2;
const TransformedVertex &transVtxB = transVtx1.y <= transVtx2.y ? transVtx2 : transVtx1;
const TransformedVertex &transVtxL = transVtx1.x <= transVtx2.x ? transVtx1 : transVtx2;
const TransformedVertex &transVtxR = transVtx1.x <= transVtx2.x ? transVtx2 : transVtx1;
// Sort the points so our perpendicular will bias the right direction.
const TransformedVertex &transVtxTL = transVtxT.y != transVtxB.y || transVtxT.x > transVtxB.x ? transVtxT : transVtxB;
const TransformedVertex &transVtxBL = transVtxT.y != transVtxB.y || transVtxT.x > transVtxB.x ? transVtxB : transVtxT;
// Okay, let's calculate the perpendicular.
float horizontal = transVtxTL.x - transVtxBL.x;
float vertical = transVtxTL.y - transVtxBL.y;
Vec2f addWidth = Vec2f(-vertical, horizontal).Normalized();
// We'll bias mostly straight lines and try to keep diagonal lines at 90 degrees.
if (fabsf(addWidth.y) < fabsf(addWidth.x / 16.0f)) {
addWidth.x = -addWidth.x;
}
// bottom right
trans[0] = transVtxBL;