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// This contains the support for shader program attribute arrays.
//
// Copyright (c) 2018 Riverbank Computing Limited <info@riverbankcomputing.com>
//
// This file is part of PyQt5.
//
// This file may be used under the terms of the GNU General Public License
// version 3.0 as published by the Free Software Foundation and appearing in
// the file LICENSE included in the packaging of this file. Please review the
// following information to ensure the GNU General Public License version 3.0
// requirements will be met: http://www.gnu.org/copyleft/gpl.html.
//
// If you do not wish to use this file under the terms of the GPL version 3.0
// then you may purchase a commercial license. For more information contact
// info@riverbankcomputing.com.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#include <Python.h>
#include "sipAPIQtGui.h"
#if defined(SIP_FEATURE_PyQt_OpenGL)
#include <QOpenGLShaderProgram>
#include <QVector2D>
#include <QVector3D>
#include <QVector4D>
#include "qpyopengl_api.h"
#include "qpyopengl_misc.h"
// Forward declaratations.
#if defined(SIP_USE_PYCAPSULE)
static void array_dtor(PyObject *capsule);
#else
static void array_dtor(void *array);
#endif
// Parse a Python object as a sequence of either QVector[234]D instances or a
// sequence of sequence of floats and return an array that can be passed to
// QGLShaderProgram::setAttributeArray(). The array is destroyed only when the
// shader is garbage collected or when replaced by another array.
const GLfloat *qpyopengl_attribute_array(PyObject *values, PyObject *shader,
PyObject *key, int *tsize, sipErrorState *estate)
{
// Check the key was created correctly.
if (!key)
{
*estate = sipErrorFail;
return 0;
}
// Get the dict that holds the converted arrays.
PyObject *dict = sipGetUserObject((sipSimpleWrapper *)shader);
if (!dict)
{
dict = PyDict_New();
if (!dict)
{
Py_DECREF(key);
*estate = sipErrorFail;
return 0;
}
sipSetUserObject((sipSimpleWrapper *)shader, dict);
}
// Check that values is a non-empty sequence.
values = PySequence_Fast(values, "an attribute array must be a sequence");
if (!values)
{
Py_DECREF(key);
*estate = sipErrorContinue;
return 0;
}
Py_ssize_t nr_items = Sequence_Fast_Size(values);
if (nr_items < 1)
{
PyErr_SetString(PyExc_TypeError,
"an attribute array must have at least one element");
Py_DECREF(key);
Py_DECREF(values);
*estate = sipErrorFail;
return 0;
}
// The first element determines the type expected.
PyObject *itm = Sequence_Fast_GetItem(values, 0);
const sipTypeDef *td;
Py_ssize_t nr_dim;
if (sipCanConvertToType(itm, sipType_QVector2D, SIP_NOT_NONE))
{
td = sipType_QVector2D;
nr_dim = 2;
}
else if (sipCanConvertToType(itm, sipType_QVector3D, SIP_NOT_NONE))
{
td = sipType_QVector3D;
nr_dim = 3;
}
else if (sipCanConvertToType(itm, sipType_QVector4D, SIP_NOT_NONE))
{
td = sipType_QVector4D;
nr_dim = 4;
}
else if (PySequence_Check(itm) && (nr_dim = PySequence_Size(itm)) >= 1)
{
td = 0;
}
else
{
PyErr_SetString(PyExc_TypeError,
"an attribute array must be a sequence of QVector2D, "
"QVector3D, QVector4D, or a sequence of sequences of floats");
Py_DECREF(key);
Py_DECREF(values);
*estate = sipErrorFail;
return 0;
}
// Create the array that will be returned.
GLfloat *array = new GLfloat[nr_items * nr_dim];
// Convert the values.
GLfloat *ap = array;
for (Py_ssize_t i = 0; i < nr_items; ++i)
{
int iserr = 0;
itm = Sequence_Fast_GetItem(values, i);
if (td)
{
void *cpp;
cpp = sipForceConvertToType(itm, td, 0,
SIP_NOT_NONE | SIP_NO_CONVERTORS, 0, &iserr);
if (iserr)
{
PyErr_Format(PyExc_TypeError,
"attribute array elements should all be '%s', not '%s'",
sipPyTypeName(sipTypeAsPyTypeObject(td)),
sipPyTypeName(Py_TYPE(itm)));
}
else if (td == sipType_QVector2D)
{
QVector2D *v = reinterpret_cast<QVector2D *>(cpp);
*ap++ = v->x();
*ap++ = v->y();
}
else if (td == sipType_QVector3D)
{
QVector3D *v = reinterpret_cast<QVector3D *>(cpp);
*ap++ = v->x();
*ap++ = v->y();
*ap++ = v->z();
}
else if (td == sipType_QVector4D)
{
QVector4D *v = reinterpret_cast<QVector4D *>(cpp);
*ap++ = v->x();
*ap++ = v->y();
*ap++ = v->z();
*ap++ = v->w();
}
}
else
{
itm = PySequence_Fast(itm,
"attribute array elements should all be sequences");
if (itm)
{
if (Sequence_Fast_Size(itm) != nr_dim)
{
PyErr_Format(PyExc_TypeError,
"attribute array elements should all be sequences "
#if PY_VERSION_HEX >= 0x02050000
"of length %zd",
#else
"of length %d",
#endif
nr_dim);
Py_DECREF(itm);
iserr = 1;
}
else
{
PyErr_Clear();
for (Py_ssize_t j = 0; j < nr_dim; ++j)
*ap++ = PyFloat_AsDouble(Sequence_Fast_GetItem(itm, j));
if (PyErr_Occurred())
{
PyErr_SetString(PyExc_TypeError,
"attribute array elements should all be "
"sequences of floats");
Py_DECREF(itm);
iserr = 1;
}
}
}
else
{
iserr = 1;
}
}
if (iserr)
{
Py_DECREF(key);
Py_DECREF(values);
delete[] array;
*estate = sipErrorFail;
return 0;
}
}
Py_DECREF(values);
*tsize = nr_dim;
// Wrap the array in a Python object so that it won't leak.
#if defined(SIP_USE_PYCAPSULE)
PyObject *array_obj = PyCapsule_New(array, 0, array_dtor);
#else
PyObject *array_obj = PyCObject_FromVoidPtr(array, array_dtor);
#endif
if (!array_obj)
{
Py_DECREF(key);
delete[] array;
*estate = sipErrorFail;
return 0;
}
int rc = PyDict_SetItem(dict, key, array_obj);
Py_DECREF(key);
Py_DECREF(array_obj);
if (rc < 0)
{
*estate = sipErrorFail;
return 0;
}
return array;
}
// The dtor for the saved attribute array.
#if defined(SIP_USE_PYCAPSULE)
static void array_dtor(PyObject *capsule)
{
delete[] reinterpret_cast<GLfloat *>(PyCapsule_GetPointer(capsule, 0));
}
#else
static void array_dtor(void *array)
{
delete[] reinterpret_cast<GLfloat *>(array);
}
#endif
#endif
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