src/platform/qt/DisplayGL.cpp (view raw)
1/* Copyright (c) 2013-2015 Jeffrey Pfau
2 *
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6#include "DisplayGL.h"
7
8#if defined(BUILD_GL) || defined(BUILD_GLES2)
9
10#include "CoreController.h"
11
12#include <QApplication>
13#include <QResizeEvent>
14#include <QTimer>
15
16#include <mgba/core/core.h>
17#include <mgba-util/math.h>
18#ifdef BUILD_GL
19#include "platform/opengl/gl.h"
20#endif
21#ifdef BUILD_GLES2
22#include "platform/opengl/gles2.h"
23#ifdef _WIN32
24#include <epoxy/wgl.h>
25#endif
26#endif
27
28using namespace QGBA;
29
30DisplayGL::DisplayGL(const QGLFormat& format, QWidget* parent)
31 : Display(parent)
32 , m_gl(nullptr)
33{
34 // This can spontaneously re-enter into this->resizeEvent before creation is done, so we
35 // need to make sure it's initialized to nullptr before we assign the new object to it
36 m_gl = new EmptyGLWidget(format, this);
37 m_painter = new PainterGL(format.majorVersion() < 2 ? 1 : m_gl->format().majorVersion(), &m_videoProxy, m_gl);
38 m_gl->setMouseTracking(true);
39 m_gl->setAttribute(Qt::WA_TransparentForMouseEvents); // This doesn't seem to work?
40 setUpdatesEnabled(false); // Prevent paint events, which can cause race conditions
41
42 connect(&m_videoProxy, &VideoProxy::dataAvailable, &m_videoProxy, &VideoProxy::processData);
43 connect(&m_videoProxy, &VideoProxy::eventPosted, &m_videoProxy, &VideoProxy::handleEvent);
44}
45
46DisplayGL::~DisplayGL() {
47 stopDrawing();
48 delete m_painter;
49}
50
51bool DisplayGL::supportsShaders() const {
52 return m_painter->supportsShaders();
53}
54
55VideoShader* DisplayGL::shaders() {
56 VideoShader* shaders = nullptr;
57 if (m_drawThread) {
58 QMetaObject::invokeMethod(m_painter, "shaders", Qt::BlockingQueuedConnection, Q_RETURN_ARG(VideoShader*, shaders));
59 } else {
60 shaders = m_painter->shaders();
61 }
62 return shaders;
63}
64
65void DisplayGL::startDrawing(std::shared_ptr<CoreController> controller) {
66 if (m_drawThread) {
67 return;
68 }
69 m_isDrawing = true;
70 m_painter->setContext(controller);
71 m_painter->setMessagePainter(messagePainter());
72 m_context = controller;
73 m_painter->resize(size());
74 m_gl->move(0, 0);
75 m_drawThread = new QThread(this);
76 m_drawThread->setObjectName("Painter Thread");
77 m_gl->context()->doneCurrent();
78 m_gl->context()->moveToThread(m_drawThread);
79 m_painter->moveToThread(m_drawThread);
80 m_videoProxy.moveToThread(m_drawThread);
81 connect(m_drawThread, &QThread::started, m_painter, &PainterGL::start);
82 m_drawThread->start();
83
84 lockAspectRatio(isAspectRatioLocked());
85 lockIntegerScaling(isIntegerScalingLocked());
86 filter(isFiltered());
87#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
88 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatioF());
89#else
90 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatio());
91#endif
92 resizePainter();
93}
94
95void DisplayGL::stopDrawing() {
96 if (m_drawThread) {
97 m_isDrawing = false;
98 CoreController::Interrupter interrupter(m_context);
99 QMetaObject::invokeMethod(m_painter, "stop", Qt::BlockingQueuedConnection);
100 m_drawThread->exit();
101 m_drawThread = nullptr;
102
103 m_gl->context()->makeCurrent();
104#if defined(_WIN32) && defined(USE_EPOXY)
105 epoxy_handle_external_wglMakeCurrent();
106#endif
107 }
108 m_context.reset();
109}
110
111void DisplayGL::pauseDrawing() {
112 if (m_drawThread) {
113 m_isDrawing = false;
114 CoreController::Interrupter interrupter(m_context);
115 QMetaObject::invokeMethod(m_painter, "pause", Qt::BlockingQueuedConnection);
116 }
117}
118
119void DisplayGL::unpauseDrawing() {
120 if (m_drawThread) {
121 m_isDrawing = true;
122 CoreController::Interrupter interrupter(m_context);
123 QMetaObject::invokeMethod(m_painter, "unpause", Qt::BlockingQueuedConnection);
124 }
125}
126
127void DisplayGL::forceDraw() {
128 if (m_drawThread) {
129 QMetaObject::invokeMethod(m_painter, "forceDraw");
130 }
131}
132
133void DisplayGL::lockAspectRatio(bool lock) {
134 Display::lockAspectRatio(lock);
135 if (m_drawThread) {
136 QMetaObject::invokeMethod(m_painter, "lockAspectRatio", Q_ARG(bool, lock));
137 }
138}
139
140void DisplayGL::lockIntegerScaling(bool lock) {
141 Display::lockIntegerScaling(lock);
142 if (m_drawThread) {
143 QMetaObject::invokeMethod(m_painter, "lockIntegerScaling", Q_ARG(bool, lock));
144 }
145}
146
147void DisplayGL::filter(bool filter) {
148 Display::filter(filter);
149 if (m_drawThread) {
150 QMetaObject::invokeMethod(m_painter, "filter", Q_ARG(bool, filter));
151 }
152}
153
154void DisplayGL::framePosted() {
155 if (m_drawThread) {
156 m_painter->enqueue(m_context->drawContext());
157 QMetaObject::invokeMethod(m_painter, "draw");
158 }
159}
160
161void DisplayGL::setShaders(struct VDir* shaders) {
162 if (m_drawThread) {
163 QMetaObject::invokeMethod(m_painter, "setShaders", Qt::BlockingQueuedConnection, Q_ARG(struct VDir*, shaders));
164 } else {
165 m_painter->setShaders(shaders);
166 }
167}
168
169void DisplayGL::clearShaders() {
170 QMetaObject::invokeMethod(m_painter, "clearShaders");
171}
172
173
174void DisplayGL::resizeContext() {
175 if (m_drawThread) {
176 m_isDrawing = false;
177 CoreController::Interrupter interrupter(m_context);
178 QMetaObject::invokeMethod(m_painter, "resizeContext", Qt::BlockingQueuedConnection);
179 }
180}
181
182void DisplayGL::resizeEvent(QResizeEvent* event) {
183 Display::resizeEvent(event);
184 resizePainter();
185}
186
187void DisplayGL::resizePainter() {
188 if (m_gl) {
189 m_gl->resize(size());
190 }
191 if (m_drawThread) {
192 QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, size()));
193 }
194}
195
196VideoProxy* DisplayGL::videoProxy() {
197 if (supportsShaders()) {
198 return &m_videoProxy;
199 }
200 return nullptr;
201}
202
203int DisplayGL::framebufferHandle() {
204 return m_painter->glTex();
205}
206
207PainterGL::PainterGL(int majorVersion, VideoProxy* proxy, QGLWidget* parent)
208 : m_gl(parent)
209 , m_videoProxy(proxy)
210{
211#ifdef BUILD_GL
212 mGLContext* glBackend;
213#endif
214#ifdef BUILD_GLES2
215 mGLES2Context* gl2Backend;
216#endif
217
218 m_gl->makeCurrent();
219#if defined(_WIN32) && defined(USE_EPOXY)
220 epoxy_handle_external_wglMakeCurrent();
221#endif
222
223 QStringList extensions = QString(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS))).split(' ');
224
225#ifdef BUILD_GLES2
226 if (extensions.contains("GL_ARB_framebuffer_object") && majorVersion >= 2) {
227 gl2Backend = static_cast<mGLES2Context*>(malloc(sizeof(mGLES2Context)));
228 mGLES2ContextCreate(gl2Backend);
229 m_backend = &gl2Backend->d;
230 m_supportsShaders = true;
231 }
232#endif
233
234#ifdef BUILD_GL
235 if (!m_backend) {
236 glBackend = static_cast<mGLContext*>(malloc(sizeof(mGLContext)));
237 mGLContextCreate(glBackend);
238 m_backend = &glBackend->d;
239 m_supportsShaders = false;
240 }
241#endif
242 m_backend->swap = [](VideoBackend* v) {
243 PainterGL* painter = static_cast<PainterGL*>(v->user);
244 if (!painter->m_gl->isVisible()) {
245 return;
246 }
247 painter->m_gl->swapBuffers();
248 };
249
250 m_backend->init(m_backend, reinterpret_cast<WHandle>(m_gl->winId()));
251#ifdef BUILD_GLES2
252 if (m_supportsShaders) {
253 m_shader.preprocessShader = static_cast<void*>(&reinterpret_cast<mGLES2Context*>(m_backend)->initialShader);
254 }
255#endif
256 m_gl->doneCurrent();
257
258 m_backend->user = this;
259 m_backend->filter = false;
260 m_backend->lockAspectRatio = false;
261
262 for (int i = 0; i < 2; ++i) {
263 m_free.append(new uint32_t[1024 * 2048]);
264 }
265}
266
267PainterGL::~PainterGL() {
268 while (!m_queue.isEmpty()) {
269 delete[] m_queue.dequeue();
270 }
271 for (auto item : m_free) {
272 delete[] item;
273 }
274 m_gl->makeCurrent();
275#if defined(_WIN32) && defined(USE_EPOXY)
276 epoxy_handle_external_wglMakeCurrent();
277#endif
278#ifdef BUILD_GLES2
279 if (m_shader.passes) {
280 mGLES2ShaderFree(&m_shader);
281 }
282#endif
283 m_backend->deinit(m_backend);
284 m_gl->doneCurrent();
285 free(m_backend);
286 m_backend = nullptr;
287}
288
289void PainterGL::setContext(std::shared_ptr<CoreController> context) {
290 m_context = context;
291 resizeContext();
292}
293
294void PainterGL::resizeContext() {
295 if (!m_context) {
296 return;
297 }
298
299 if (!m_active) {
300 m_gl->makeCurrent();
301#if defined(_WIN32) && defined(USE_EPOXY)
302 epoxy_handle_external_wglMakeCurrent();
303#endif
304 }
305
306 QSize size = m_context->screenDimensions();
307 m_backend->setDimensions(m_backend, size.width(), size.height());
308 if (!m_active) {
309 m_gl->doneCurrent();
310 }
311}
312
313void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
314 m_messagePainter = messagePainter;
315}
316
317void PainterGL::resize(const QSize& size) {
318 m_size = size;
319 if (m_started && !m_active) {
320 forceDraw();
321 }
322}
323
324void PainterGL::lockAspectRatio(bool lock) {
325 m_backend->lockAspectRatio = lock;
326 if (m_started && !m_active) {
327 forceDraw();
328 }
329}
330
331void PainterGL::lockIntegerScaling(bool lock) {
332 m_backend->lockIntegerScaling = lock;
333 if (m_started && !m_active) {
334 forceDraw();
335 }
336}
337
338void PainterGL::filter(bool filter) {
339 m_backend->filter = filter;
340 if (m_started && !m_active) {
341 forceDraw();
342 }
343}
344
345void PainterGL::start() {
346 m_gl->makeCurrent();
347#if defined(_WIN32) && defined(USE_EPOXY)
348 epoxy_handle_external_wglMakeCurrent();
349#endif
350
351#ifdef BUILD_GLES2
352 if (m_supportsShaders && m_shader.passes) {
353 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
354 }
355#endif
356
357 m_active = true;
358 m_started = true;
359}
360
361void PainterGL::draw() {
362 if (m_queue.isEmpty()) {
363 return;
364 }
365
366 if (mCoreSyncWaitFrameStart(&m_context->thread()->impl->sync) || !m_queue.isEmpty()) {
367 dequeue();
368 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
369 m_painter.begin(m_gl->context()->device());
370 performDraw();
371 m_painter.end();
372 m_backend->swap(m_backend);
373 if (!m_delayTimer.isValid()) {
374 m_delayTimer.start();
375 } else if (m_gl->format().swapInterval()) {
376 while (m_delayTimer.elapsed() < 15) {
377 QThread::usleep(100);
378 }
379 m_delayTimer.restart();
380 }
381 } else {
382 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
383 }
384 if (!m_queue.isEmpty()) {
385 QMetaObject::invokeMethod(this, "draw", Qt::QueuedConnection);
386 }
387}
388
389void PainterGL::forceDraw() {
390 m_painter.begin(m_gl->context()->device());
391 performDraw();
392 m_painter.end();
393 m_backend->swap(m_backend);
394}
395
396void PainterGL::stop() {
397 m_active = false;
398 m_started = false;
399 dequeueAll();
400 m_backend->clear(m_backend);
401 m_backend->swap(m_backend);
402 m_gl->doneCurrent();
403 m_gl->context()->moveToThread(m_gl->thread());
404 m_context.reset();
405 moveToThread(m_gl->thread());
406 m_videoProxy->moveToThread(m_gl->thread());
407}
408
409void PainterGL::pause() {
410 m_active = false;
411}
412
413void PainterGL::unpause() {
414 m_active = true;
415}
416
417void PainterGL::performDraw() {
418 m_painter.beginNativePainting();
419#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
420 float r = m_gl->devicePixelRatioF();
421#else
422 float r = m_gl->devicePixelRatio();
423#endif
424 m_backend->resized(m_backend, m_size.width() * r, m_size.height() * r);
425 m_backend->drawFrame(m_backend);
426 m_painter.endNativePainting();
427 if (m_messagePainter) {
428 m_messagePainter->paint(&m_painter);
429 }
430}
431
432void PainterGL::enqueue(const uint32_t* backing) {
433 m_mutex.lock();
434 uint32_t* buffer = nullptr;
435 if (backing) {
436 if (m_free.isEmpty()) {
437 buffer = m_queue.dequeue();
438 } else {
439 buffer = m_free.takeLast();
440 }
441 QSize size = m_context->screenDimensions();
442 memcpy(buffer, backing, size.width() * size.height() * BYTES_PER_PIXEL);
443 }
444 m_queue.enqueue(buffer);
445 m_mutex.unlock();
446}
447
448void PainterGL::dequeue() {
449 m_mutex.lock();
450 if (m_queue.isEmpty()) {
451 m_mutex.unlock();
452 return;
453 }
454 uint32_t* buffer = m_queue.dequeue();
455 if (buffer) {
456 m_backend->postFrame(m_backend, buffer);
457 m_free.append(buffer);
458 }
459 m_mutex.unlock();
460}
461
462void PainterGL::dequeueAll() {
463 uint32_t* buffer = 0;
464 m_mutex.lock();
465 while (!m_queue.isEmpty()) {
466 buffer = m_queue.dequeue();
467 if (buffer) {
468 m_free.append(buffer);
469 }
470 }
471 if (buffer) {
472 m_backend->postFrame(m_backend, buffer);
473 }
474 m_mutex.unlock();
475}
476
477void PainterGL::setShaders(struct VDir* dir) {
478 if (!supportsShaders()) {
479 return;
480 }
481 if (!m_active) {
482#ifdef BUILD_GLES2
483 m_gl->makeCurrent();
484#if defined(_WIN32) && defined(USE_EPOXY)
485 epoxy_handle_external_wglMakeCurrent();
486#endif
487 }
488 if (m_shader.passes) {
489 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
490 mGLES2ShaderFree(&m_shader);
491 }
492 mGLES2ShaderLoad(&m_shader, dir);
493 if (m_started) {
494 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
495 }
496 if (!m_active) {
497 m_gl->doneCurrent();
498 }
499#endif
500}
501
502void PainterGL::clearShaders() {
503 if (!supportsShaders()) {
504 return;
505 }
506 if (!m_active) {
507#ifdef BUILD_GLES2
508 m_gl->makeCurrent();
509#if defined(_WIN32) && defined(USE_EPOXY)
510 epoxy_handle_external_wglMakeCurrent();
511#endif
512 }
513 if (m_shader.passes) {
514 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
515 mGLES2ShaderFree(&m_shader);
516 }
517 if (!m_active) {
518 m_gl->doneCurrent();
519 }
520#endif
521}
522
523VideoShader* PainterGL::shaders() {
524 return &m_shader;
525}
526
527int PainterGL::glTex() {
528#ifdef BUILD_GLES2
529 if (supportsShaders()) {
530 mGLES2Context* gl2Backend = reinterpret_cast<mGLES2Context*>(m_backend);
531 return gl2Backend->tex;
532 }
533#endif
534#ifdef BUILD_GL
535 mGLContext* glBackend = reinterpret_cast<mGLContext*>(m_backend);
536 return glBackend->tex;
537#else
538 return -1;
539#endif
540}
541
542#endif