qssgrenderparticles.cpp

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++ // Copyright (C) 2021 The Qt Company Ltd.

++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

++ // Qt-Security score:significant reason:default

++

++

++ #include <QtQuick3DRuntimeRender/private/qssgrenderparticles_p.h>

++ #include <cmath>

++

++ QT_BEGIN_NAMESPACE

++

++ static int divisibleBy(int a, int b)

++ {

++     return (a % b) ? a + b - (a % b) : a;

++ }

++ static int ceilDivide(int a, int b)

++ {

++     int x = a / b;

++     int y = (a % b) ? 1 : 0;

++     return x + y;

++ }

++

++ void QSSGParticleBuffer::resize(int particleCount, int particleSize)

++ {

++     if (particleCount == 0) {

++         m_particlesPerSlice = 0;

++         m_particleCount = 0;

++         m_sliceStride = 0;

++         m_size = QSize();

++         m_particleBuffer.resize(0);

++         return;

++     }

++     int vec4PerParticle = ceilDivide(particleSize, 16);

++     int vec4s = particleCount * vec4PerParticle;

++     int width = divisibleBy(std::sqrt(vec4s), vec4PerParticle);

++     int height = ceilDivide(vec4s, width);

++     m_particlesPerSlice = width / vec4PerParticle;

++     m_particleCount = particleCount;

++     width = divisibleBy(width, 4);

++     height = divisibleBy(height, 4);

++     m_sliceStride = width * 16;

++     m_size = QSize(width, height);

++     m_particleBuffer.resize(m_sliceStride * height);

++ }

++

++ void QSSGParticleBuffer::resizeLine(int particleCount, int segmentCount)

++ {

++     m_segments = segmentCount;

++     resize(particleCount * segmentCount, sizeof(QSSGLineParticle));

++ }

++

++ void QSSGParticleBuffer::setBounds(const QSSGBounds3& bounds)

++ {

++     m_bounds = bounds;

++     m_serial++;

++ }

++

++ char *QSSGParticleBuffer::pointer()

++ {

++     return m_particleBuffer.data();

++ }

++

++ const char *QSSGParticleBuffer::pointer() const

++ {

++     return m_particleBuffer.constData();

++ }

++

++ int QSSGParticleBuffer::particlesPerSlice() const

++ {

++     return m_particlesPerSlice;

++ }

++

++ int QSSGParticleBuffer::sliceStride() const

++ {

++     return m_sliceStride;

++ }

++

++ int QSSGParticleBuffer::particleCount() const

++ {

++     return m_particleCount;

++ }

++

++ QSize QSSGParticleBuffer::size() const

++ {

++     return m_size;

++ }

++

++ int QSSGParticleBuffer::sliceCount() const

++ {

++     return m_size.height();

++ }

++

++ QByteArray QSSGParticleBuffer::data() const

++ {

++     return m_particleBuffer;

++ }

++

++ int QSSGParticleBuffer::bufferSize() const

++ {

++     return m_particleBuffer.size();

++ }

++

++ int QSSGParticleBuffer::serial() const

++ {

++     return m_serial;

++ }

++

++ int QSSGParticleBuffer::segments() const

++ {

++     return m_segments;

++ }

++

++ QSSGBounds3 QSSGParticleBuffer::bounds() const

++ {

++     return m_bounds;

++ }

++

++ QSSGRenderParticles::QSSGRenderParticles()

++     : QSSGRenderNode(QSSGRenderGraphObject::Type::Particles)

++ {

++

++ }

++

++ QT_END_NAMESPACE