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Round buffer positions when calculating normalised UV coordinates

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Otherwise we end up with UVs that are slightly off as the position is
fractional while the size is integer.
This commit is contained in:
Arjen Hiemstra 2022-08-12 12:31:50 +02:00
parent 64e42bbd04
commit 2ad497c8f9
1 changed files with 8 additions and 4 deletions
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12
src/surfaceitem.cpp
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@ -136,10 +136,14 @@ WindowQuadList SurfaceItem::buildQuads() const
for (const QRectF rect : region) {
WindowQuad quad;
const QPointF bufferTopLeft = m_surfaceToBufferMatrix.map(rect.topLeft());
const QPointF bufferTopRight = m_surfaceToBufferMatrix.map(rect.topRight());
const QPointF bufferBottomRight = m_surfaceToBufferMatrix.map(rect.bottomRight());
const QPointF bufferBottomLeft = m_surfaceToBufferMatrix.map(rect.bottomLeft());
// Use toPoint to round the device position to match what we eventually
// do for the geometry, otherwise we end up with mismatched UV
// coordinates as the texture size is going to be in (rounded) device
// coordinates as well.
const QPointF bufferTopLeft = m_surfaceToBufferMatrix.map(rect.topLeft()).toPoint();
const QPointF bufferTopRight = m_surfaceToBufferMatrix.map(rect.topRight()).toPoint();
const QPointF bufferBottomRight = m_surfaceToBufferMatrix.map(rect.bottomRight()).toPoint();
const QPointF bufferBottomLeft = m_surfaceToBufferMatrix.map(rect.bottomLeft()).toPoint();
quad[0] = WindowVertex(rect.topLeft(), QPointF{bufferTopLeft.x() / size.width(), bufferTopLeft.y() / size.height()});
quad[1] = WindowVertex(rect.topRight(), QPointF{bufferTopRight.x() / size.width(), bufferTopRight.y() / size.height()});