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39
40#ifndef QT3DRENDER_RENDER_OPENGL_QGRAPHICSUTILS_P_H
41#define QT3DRENDER_RENDER_OPENGL_QGRAPHICSUTILS_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists for the convenience
48// of other Qt classes. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <Qt3DRender/qt3drender_global.h>
55#include <QMatrix2x2>
56#include <QMatrix3x3>
57#include <QMatrix4x4>
58#include <QGenericMatrix>
59#include <QVector2D>
60#include <QVarLengthArray>
61#include <QColor>
62#include <shadervariables_p.h>
63
64QT_BEGIN_NAMESPACE
65
66namespace Qt3DRender {
67
68namespace Render {
69
70namespace OpenGL {
71
72namespace {
73
74const int QMatrix2x2Type = qMetaTypeId<QMatrix2x2>();
75const int QMatrix2x3Type = qMetaTypeId<QMatrix2x3>();
76const int QMatrix2x4Type = qMetaTypeId<QMatrix2x4>();
77const int QMatrix3x2Type = qMetaTypeId<QMatrix3x2>();
78const int QMatrix3x3Type = qMetaTypeId<QMatrix3x3>();
79const int QMatrix3x4Type = qMetaTypeId<QMatrix3x4>();
80const int QMatrix4x2Type = qMetaTypeId<QMatrix4x2>();
81const int QMatrix4x3Type = qMetaTypeId<QMatrix4x3>();
82
83}
84
85class QGraphicsUtils
86{
87
88public:
89
90 template<typename T>
91 static const char *bytesFromVariant(const QVariant &v)
92 {
93 uint byteSize = sizeof(T);
94 // Max 16 float that we may want as doubles
95 // 64 should be best for most cases
96 static QVarLengthArray<char, 64> array(16 * byteSize);
97 memset(s: array.data(), c: 0, n: array.size());
98
99 switch (static_cast<QMetaType::Type>(v.type())) {
100
101 // 1 byte
102 case QMetaType::Bool: {
103 T data = v.value<bool>();
104 memcpy(array.data(), &data, byteSize);
105 break;
106 }
107 case QMetaType::Char: {
108 T data = v.value<char>();
109 memcpy(array.data(), &data, byteSize);
110 break;
111 }
112
113 // 4 bytes
114 case QMetaType::Float: {
115 T data = v.value<float>();
116 memcpy(array.data(), &data, byteSize);
117 break;
118 }
119 case QMetaType::Int: {
120 T data = v.value<int>();
121 memcpy(array.data(), &data, byteSize);
122 break;
123
124 }
125 case QMetaType::UInt: {
126 qDebug() << "UINT";
127 T data = v.value<uint>();
128 memcpy(array.data(), &data, byteSize);
129 break;
130 }
131
132 // 8 bytes
133 case QMetaType::Double: {
134 T data = v.value<double>();
135 memcpy(array.data(), &data, byteSize);
136 break;
137 }
138
139 // 2 floats
140 case QMetaType::QPointF: {
141 QPointF vv = v.value<QPointF>();
142 T data = vv.x();
143 memcpy(array.data(), &data, byteSize);
144 data = vv.y();
145 memcpy(array.data() + byteSize, &data, byteSize);
146 break;
147 }
148 case QMetaType::QSizeF: {
149 QSizeF vv = v.value<QSizeF>();
150 T data = vv.width();
151 memcpy(array.data(), &data, byteSize);
152 data = vv.height();
153 memcpy(array.data() + byteSize, &data, byteSize);
154 break;
155 }
156
157 case QMetaType::QVector2D: {
158 QVector2D vv = v.value<QVector2D>();
159 T data = vv.x();
160 memcpy(array.data(), &data, byteSize);
161 data = vv.y();
162 memcpy(array.data() + byteSize, &data, byteSize);
163 break;
164 }
165
166 // 2 ints
167 case QMetaType::QPoint: {
168 QPointF vv = v.value<QPoint>();
169 T data = vv.x();
170 memcpy(array.data(), &data, byteSize);
171 data = vv.y();
172 memcpy(array.data() + byteSize, &data, byteSize);
173 break;
174 }
175
176 case QMetaType::QSize: {
177 QSize vv = v.value<QSize>();
178 T data = vv.width();
179 memcpy(array.data(), &data, byteSize);
180 data = vv.height();
181 memcpy(array.data() + byteSize, &data, byteSize);
182 break;
183 }
184
185 // 3 floats
186 case QMetaType::QVector3D: {
187 QVector3D vv = v.value<QVector3D>();
188 T data = vv.x();
189 memcpy(array.data(), &data, byteSize);
190 data = vv.y();
191 memcpy(array.data() + byteSize, &data, byteSize);
192 data = vv.z();
193 memcpy(array.data() + 2 * byteSize, &data, byteSize);
194 break;
195 }
196
197 // 4 floats
198 case QMetaType::QVector4D: {
199 QVector4D vv = v.value<QVector4D>();
200 T data = vv.x();
201 memcpy(array.data(), &data, byteSize);
202 data = vv.y();
203 memcpy(array.data() + byteSize, &data, byteSize);
204 data = vv.z();
205 memcpy(array.data() + 2 * byteSize, &data, byteSize);
206 data = vv.w();
207 memcpy(array.data() + 3 * byteSize, &data, byteSize);
208 break;
209 }
210
211 case QMetaType::QQuaternion: {
212
213 break;
214 }
215
216 case QMetaType::QRectF: {
217 QRectF vv = v.value<QRectF>();
218 T data = vv.x();
219 memcpy(array.data(), &data, byteSize);
220 data = vv.y();
221 memcpy(array.data() + byteSize, &data, byteSize);
222 data = vv.width();
223 memcpy(array.data() + 2 * byteSize, &data, byteSize);
224 data = vv.height();
225 memcpy(array.data() + 3 * byteSize, &data, byteSize);
226 break;
227 }
228
229 case QMetaType::QColor: {
230 QColor vv = v.value<QColor>();
231 T data = vv.redF();
232 memcpy(array.data(), &data, byteSize);
233 data = vv.greenF();
234 memcpy(array.data() + byteSize, &data, byteSize);
235 data = vv.blueF();
236 memcpy(array.data() + 2 * byteSize, &data, byteSize);
237 data = vv.alphaF();
238 memcpy(array.data() + 3 * byteSize, &data, byteSize);
239 break;
240 }
241
242 // 4 ints
243 case QMetaType::QRect: {
244 QRectF vv = v.value<QRect>();
245 T data = vv.x();
246 memcpy(array.data(), &data, byteSize);
247 data = vv.y();
248 memcpy(array.data() + byteSize, &data, byteSize);
249 data = vv.width();
250 memcpy(array.data() + 2 * byteSize, &data, byteSize);
251 data = vv.height();
252 memcpy(array.data() + 3 * byteSize, &data, byteSize);
253 break;
254 }
255
256 // 16 floats
257 case QMetaType::QMatrix4x4: {
258 QMatrix4x4 mat = v.value<QMatrix4x4>();
259 float *data = mat.data();
260 for (int i = 0; i < 16; i++) {
261 T d = data[i];
262 memcpy(array.data() + i * byteSize, &d, byteSize);
263 }
264 break;
265 }
266
267 default: {
268
269 float *data = nullptr;
270 if (v.userType() == QMatrix3x3Type) {
271 QMatrix3x3 mat = v.value<QMatrix3x3>();
272 data = mat.data();
273 for (int i = 0; i < 9; i++) {
274 T d = data[i];
275 memcpy(array.data() + i * byteSize, &d, byteSize);
276 }
277 }
278 else if (v.userType() == QMatrix2x2Type) {
279 QMatrix2x2 mat = v.value<QMatrix2x2>();
280 data = mat.data();
281 for (int i = 0; i < 4; i++) {
282 T d = data[i];
283 memcpy(array.data() + i * byteSize, &d, byteSize);
284 }
285 }
286 else if (v.userType() == QMatrix2x3Type) {
287 QMatrix2x3 mat = v.value<QMatrix2x3>();
288 data = mat.data();
289 for (int i = 0; i < 6; i++) {
290 T d = data[i];
291 memcpy(array.data() + i * byteSize, &d, byteSize);
292 }
293 }
294 else if (v.userType() == QMatrix3x2Type) {
295 QMatrix3x2 mat = v.value<QMatrix3x2>();
296 data = mat.data();
297 for (int i = 0; i < 6; i++) {
298 T d = data[i];
299 memcpy(array.data() + i * byteSize, &d, byteSize);
300 }
301 }
302 else if (v.userType() == QMatrix2x4Type) {
303 QMatrix2x4 mat = v.value<QMatrix2x4>();
304 data = mat.data();
305 for (int i = 0; i < 8; i++) {
306 T d = data[i];
307 memcpy(array.data() + i * byteSize, &d, byteSize);
308 }
309 }
310 else if (v.userType() == QMatrix4x2Type) {
311 QMatrix4x2 mat = v.value<QMatrix4x2>();
312 data = mat.data();
313 for (int i = 0; i < 8; i++) {
314 T d = data[i];
315 memcpy(array.data() + i * byteSize, &d, byteSize);
316 }
317 }
318 else if (v.userType() == QMatrix3x4Type) {
319 QMatrix3x4 mat = v.value<QMatrix3x4>();
320 data = mat.data();
321 for (int i = 0; i < 12; i++) {
322 T d = data[i];
323 memcpy(array.data() + i * byteSize, &d, byteSize);
324 }
325 }
326 else if (v.userType() == QMatrix4x3Type) {
327 QMatrix4x3 mat = v.value<QMatrix4x3>();
328 data = mat.data();
329 for (int i = 0; i < 12; i++) {
330 T d = data[i];
331 memcpy(array.data() + i * byteSize, &d, byteSize);
332 }
333 }
334 else
335 qWarning() << Q_FUNC_INFO << "QVariant type conversion not handled for " << v.type();
336 break;
337 }
338
339 }
340 return array.constData();
341 }
342
343
344 template<typename T>
345 static const T *valueArrayFromVariant(const QVariant &v, int count, int tupleSize)
346 {
347 uint byteSize = sizeof(T);
348 uint offset = byteSize * tupleSize;
349 static QVarLengthArray<char, 1024> uniformValuesArray(1024);
350 uniformValuesArray.resize(asize: count * offset);
351 char *data = uniformValuesArray.data();
352 memset(s: data, c: 0, n: uniformValuesArray.size());
353
354 QVariantList vList = v.toList();
355 // Handles list of QVariant: usually arrays of float
356 if (!vList.isEmpty()) {
357 for (int i = 0; i < vList.length() && uint(i) * offset < uint(uniformValuesArray.size()); i++) {
358 const char *subBuffer = QGraphicsUtils::bytesFromVariant<T>(vList.at(i));
359 memcpy(dest: data + i * offset, src: subBuffer, n: offset);
360 }
361 }
362 else {
363 memcpy(data, QGraphicsUtils::bytesFromVariant<T>(v), offset);
364 }
365 return reinterpret_cast<const T *>(uniformValuesArray.constData());
366 }
367
368 template<typename T>
369 static void fillDataArray(void *buffer, const T *data, const ShaderUniform &description, int tupleSize)
370 {
371 uint offset = description.m_offset / sizeof(T);
372 uint stride = description.m_arrayStride / sizeof(T);
373 T *bufferData = (T*)buffer;
374
375 for (int i = 0; i < description.m_size; ++i) {
376 for (int j = 0; j < tupleSize; j++) {
377 int idx = i * tupleSize + j;
378 bufferData[offset + j] = data[idx];
379 }
380 offset += stride;
381 }
382 }
383
384 template<typename T>
385 static void fillDataMatrixArray(void *buffer, const T *data, const ShaderUniform &description, int cols, int rows)
386 {
387 uint offset = description.m_offset / sizeof(T);
388 uint arrayStride = description.m_arrayStride / sizeof(T);
389 uint matrixStride = description.m_matrixStride / sizeof(T);
390 T *bufferData = (T*)buffer;
391
392 for (int i = 0; i < description.m_size; ++i) {
393 for (int col = 0; col < cols; ++col) {
394 for (int row = 0; row < rows; ++row) {
395 int idx = i * cols * rows + rows * col + row;
396 bufferData[offset + row] = data[idx];
397 }
398 offset += matrixStride;
399 }
400 offset += arrayStride;
401 }
402 }
403
404};
405
406} // namespace OpenGL
407
408} // namespace Render
409
410} // namespace Qt3DRender
411
412QT_END_NAMESPACE
413
414#endif // QT3DRENDER_RENDER_OPENGL_QGRAPHICSUTILS_P_H
415

source code of qt3d/src/plugins/renderers/opengl/graphicshelpers/qgraphicsutils_p.h