qsggeometry.cpp

Go to the documentation of this file.

// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qsggeometry.h"
#include "qsggeometry_p.h"
 
#ifdef Q_OS_QNX
#include <malloc.h>
#endif
 
QT_BEGIN_NAMESPACE
 
 
QSGGeometry::Attribute QSGGeometry::Attribute::create(int attributeIndex, int tupleSize, int primitiveType, bool isPrimitive)
{
    Attribute a = { attributeIndex, tupleSize, primitiveType, isPrimitive, UnknownAttribute, 0 };
    return a;
}
 
QSGGeometry::Attribute QSGGeometry::Attribute::createWithAttributeType(int pos, int tupleSize, int primitiveType, AttributeType attributeType)
{
    Attribute a;
    a.position = pos;
    a.tupleSize = tupleSize;
    a.type = primitiveType;
    a.isVertexCoordinate = attributeType == PositionAttribute;
    a.attributeType = attributeType;
    a.reserved = 0;
    return a;
}
 
const QSGGeometry::AttributeSet &QSGGeometry::defaultAttributes_Point2D()
{
    static Attribute data[] = {
        Attribute::createWithAttributeType(0, 2, FloatType, PositionAttribute)
    };
    static AttributeSet attrs = { 1, sizeof(float) * 2, data };
    return attrs;
}
 
const QSGGeometry::AttributeSet &QSGGeometry::defaultAttributes_TexturedPoint2D()
{
    static Attribute data[] = {
        Attribute::createWithAttributeType(0, 2, FloatType, PositionAttribute),
        Attribute::createWithAttributeType(1, 2, FloatType, TexCoordAttribute)
    };
    static AttributeSet attrs = { 2, sizeof(float) * 4, data };
    return attrs;
}
 
const QSGGeometry::AttributeSet &QSGGeometry::defaultAttributes_ColoredPoint2D()
{
    static Attribute data[] = {
        Attribute::createWithAttributeType(0, 2, FloatType, PositionAttribute),
        Attribute::createWithAttributeType(1, 4, UnsignedByteType, ColorAttribute)
    };
    static AttributeSet attrs = { 2, 2 * sizeof(float) + 4 * sizeof(char), data };
    return attrs;
}
 
 
QSGGeometry::QSGGeometry(const QSGGeometry::AttributeSet &attributes,
                         int vertexCount,
                         int indexCount,
                         int indexType)
    : m_drawing_mode(DrawTriangleStrip)
    , m_vertex_count(0)
    , m_index_count(0)
    , m_index_type(indexType)
    , m_attributes(attributes)
    , m_data(nullptr)
    , m_index_data_offset(-1)
    , m_server_data(nullptr)
    , m_owns_data(false)
    , m_index_usage_pattern(AlwaysUploadPattern)
    , m_vertex_usage_pattern(AlwaysUploadPattern)
    , m_line_width(1.0)
{
    Q_UNUSED(m_reserved_bits);
    Q_ASSERT(m_attributes.count > 0);
    Q_ASSERT(m_attributes.stride > 0);
    if (indexType != UnsignedByteType
        && indexType != UnsignedShortType
        && indexType != UnsignedIntType) {
        qFatal("QSGGeometry: Unsupported index type, %x.\n", indexType);
    }
 
    // Because allocate reads m_vertex_count, m_index_count and m_owns_data, these
    // need to be set before calling allocate...
    allocate(vertexCount, indexCount);
}
 
QSGGeometry::~QSGGeometry()
{
    if (m_owns_data)
        free(m_data);
 
    if (m_server_data)
        delete m_server_data;
}
 
void *QSGGeometry::indexData()
{
    return m_index_data_offset < 0
            ? nullptr
            : ((char *) m_data + m_index_data_offset);
}
 
const void *QSGGeometry::indexData() const
{
    return m_index_data_offset < 0
            ? nullptr
            : ((char *) m_data + m_index_data_offset);
}
 
void QSGGeometry::setDrawingMode(unsigned int mode)
{
    m_drawing_mode = mode;
}
 
float QSGGeometry::lineWidth() const
{
    return m_line_width;
}
 
void QSGGeometry::setLineWidth(float width)
{
    m_line_width = width;
}
 
void QSGGeometry::allocate(int vertexCount, int indexCount)
{
    if (vertexCount == m_vertex_count && indexCount == m_index_count)
        return;
 
    m_vertex_count = vertexCount;
    m_index_count = indexCount;
 
    bool canUsePrealloc = m_index_count <= 0;
    int vertexByteSize = m_attributes.stride * m_vertex_count;
 
    if (m_owns_data)
        free(m_data);
 
    if (canUsePrealloc && vertexByteSize <= (int) sizeof(m_prealloc)) {
        m_data = (void *) &m_prealloc[0];
        m_index_data_offset = -1;
        m_owns_data = false;
    } else {
        Q_ASSERT(m_index_type == UnsignedIntType || m_index_type == UnsignedShortType);
        int indexByteSize = indexCount * (m_index_type == UnsignedShortType ? sizeof(quint16) : sizeof(quint32));
        m_data = (void *) malloc(vertexByteSize + indexByteSize);
        Q_CHECK_PTR(m_data);
        m_index_data_offset = vertexByteSize;
        m_owns_data = true;
    }
 
    // If we have associated vbo data we could potentially crash later if
    // the old buffers are used with the new vertex and index count, so we force
    // an update in the renderer in that case. This is really the users responsibility
    // but it is cheap for us to enforce this, so why not...
    if (m_server_data) {
        markIndexDataDirty();
        markVertexDataDirty();
    }
 
}
 
void QSGGeometry::updateRectGeometry(QSGGeometry *g, const QRectF &rect)
{
    Point2D *v = g->vertexDataAsPoint2D();
    v[0].x = rect.left();
    v[0].y = rect.top();
 
    v[1].x = rect.left();
    v[1].y = rect.bottom();
 
    v[2].x = rect.right();
    v[2].y = rect.top();
 
    v[3].x = rect.right();
    v[3].y = rect.bottom();
}
 
void QSGGeometry::updateTexturedRectGeometry(QSGGeometry *g, const QRectF &rect, const QRectF &textureRect)
{
    TexturedPoint2D *v = g->vertexDataAsTexturedPoint2D();
    v[0].x = rect.left();
    v[0].y = rect.top();
    v[0].tx = textureRect.left();
    v[0].ty = textureRect.top();
 
    v[1].x = rect.left();
    v[1].y = rect.bottom();
    v[1].tx = textureRect.left();
    v[1].ty = textureRect.bottom();
 
    v[2].x = rect.right();
    v[2].y = rect.top();
    v[2].tx = textureRect.right();
    v[2].ty = textureRect.top();
 
    v[3].x = rect.right();
    v[3].y = rect.bottom();
    v[3].tx = textureRect.right();
    v[3].ty = textureRect.bottom();
}
 
void QSGGeometry::updateColoredRectGeometry(QSGGeometry *g, const QRectF &rect)
{
    ColoredPoint2D *v = g->vertexDataAsColoredPoint2D();
    v[0].x = rect.left();
    v[0].y = rect.top();
 
    v[1].x = rect.left();
    v[1].y = rect.bottom();
 
    v[2].x = rect.right();
    v[2].y = rect.top();
 
    v[3].x = rect.right();
    v[3].y = rect.bottom();
}
 
void QSGGeometry::setIndexDataPattern(DataPattern p)
{
    m_index_usage_pattern = p;
}
 
 
 
 
void QSGGeometry::setVertexDataPattern(DataPattern p)
{
    m_vertex_usage_pattern = p;
}
 
 
 
 
void QSGGeometry::markIndexDataDirty()
{
    m_dirty_index_data = true;
}
 
 
 
void QSGGeometry::markVertexDataDirty()
{
    m_dirty_vertex_data = true;
}
 
 
QT_END_NAMESPACE