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#if !defined(_WIN32) || defined(USE_EPOXY)
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_context.reset();
104}
105
106void DisplayGL::pauseDrawing() {
107 if (m_drawThread) {
108 m_isDrawing = false;
109 CoreController::Interrupter interrupter(m_context);
110 QMetaObject::invokeMethod(m_painter, "pause", Qt::BlockingQueuedConnection);
111 }
112}
113
114void DisplayGL::unpauseDrawing() {
115 if (m_drawThread) {
116 m_isDrawing = true;
117 CoreController::Interrupter interrupter(m_context);
118 QMetaObject::invokeMethod(m_painter, "unpause", Qt::BlockingQueuedConnection);
119 }
120}
121
122void DisplayGL::forceDraw() {
123 if (m_drawThread) {
124 QMetaObject::invokeMethod(m_painter, "forceDraw");
125 }
126}
127
128void DisplayGL::lockAspectRatio(bool lock) {
129 Display::lockAspectRatio(lock);
130 if (m_drawThread) {
131 QMetaObject::invokeMethod(m_painter, "lockAspectRatio", Q_ARG(bool, lock));
132 }
133}
134
135void DisplayGL::lockIntegerScaling(bool lock) {
136 Display::lockIntegerScaling(lock);
137 if (m_drawThread) {
138 QMetaObject::invokeMethod(m_painter, "lockIntegerScaling", Q_ARG(bool, lock));
139 }
140}
141
142void DisplayGL::filter(bool filter) {
143 Display::filter(filter);
144 if (m_drawThread) {
145 QMetaObject::invokeMethod(m_painter, "filter", Q_ARG(bool, filter));
146 }
147}
148
149void DisplayGL::framePosted() {
150 if (m_drawThread) {
151 m_painter->enqueue(m_context->drawContext());
152 QMetaObject::invokeMethod(m_painter, "draw");
153 }
154}
155
156void DisplayGL::setShaders(struct VDir* shaders) {
157 if (m_drawThread) {
158 QMetaObject::invokeMethod(m_painter, "setShaders", Qt::BlockingQueuedConnection, Q_ARG(struct VDir*, shaders));
159 } else {
160 m_painter->setShaders(shaders);
161 }
162}
163
164void DisplayGL::clearShaders() {
165 QMetaObject::invokeMethod(m_painter, "clearShaders");
166}
167
168
169void DisplayGL::resizeContext() {
170 if (m_drawThread) {
171 m_isDrawing = false;
172 CoreController::Interrupter interrupter(m_context);
173 QMetaObject::invokeMethod(m_painter, "resizeContext", Qt::BlockingQueuedConnection);
174 }
175}
176
177void DisplayGL::resizeEvent(QResizeEvent* event) {
178 Display::resizeEvent(event);
179 resizePainter();
180}
181
182void DisplayGL::resizePainter() {
183 if (m_gl) {
184 m_gl->resize(size());
185 }
186 if (m_drawThread) {
187 QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, size()));
188 }
189}
190
191VideoProxy* DisplayGL::videoProxy() {
192 if (supportsShaders()) {
193 return &m_videoProxy;
194 }
195 return nullptr;
196}
197
198PainterGL::PainterGL(int majorVersion, VideoProxy* proxy, QGLWidget* parent)
199 : m_gl(parent)
200 , m_videoProxy(proxy)
201{
202#ifdef BUILD_GL
203 mGLContext* glBackend;
204#endif
205#if !defined(_WIN32) || defined(USE_EPOXY)
206 mGLES2Context* gl2Backend;
207#endif
208
209 m_gl->makeCurrent();
210#if defined(_WIN32) && defined(USE_EPOXY)
211 epoxy_handle_external_wglMakeCurrent();
212#endif
213
214 QStringList extensions = QString(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS))).split(' ');
215
216#if !defined(_WIN32) || defined(USE_EPOXY)
217 if (extensions.contains("GL_ARB_framebuffer_object") && majorVersion >= 2) {
218 gl2Backend = static_cast<mGLES2Context*>(malloc(sizeof(mGLES2Context)));
219 mGLES2ContextCreate(gl2Backend);
220 m_backend = &gl2Backend->d;
221 m_supportsShaders = true;
222 }
223#endif
224
225#ifdef BUILD_GL
226 if (!m_backend) {
227 glBackend = static_cast<mGLContext*>(malloc(sizeof(mGLContext)));
228 mGLContextCreate(glBackend);
229 m_backend = &glBackend->d;
230 m_supportsShaders = false;
231 }
232#endif
233 m_backend->swap = [](VideoBackend* v) {
234 PainterGL* painter = static_cast<PainterGL*>(v->user);
235 if (!painter->m_gl->isVisible()) {
236 return;
237 }
238 painter->m_gl->swapBuffers();
239 };
240
241 m_backend->init(m_backend, reinterpret_cast<WHandle>(m_gl->winId()));
242#if !defined(_WIN32) || defined(USE_EPOXY)
243 if (m_supportsShaders) {
244 m_shader.preprocessShader = static_cast<void*>(&reinterpret_cast<mGLES2Context*>(m_backend)->initialShader);
245 }
246#endif
247 m_gl->doneCurrent();
248
249 m_backend->user = this;
250 m_backend->filter = false;
251 m_backend->lockAspectRatio = false;
252
253 for (int i = 0; i < 2; ++i) {
254 m_free.append(new uint32_t[1024 * 2048]);
255 }
256}
257
258PainterGL::~PainterGL() {
259 while (!m_queue.isEmpty()) {
260 delete[] m_queue.dequeue();
261 }
262 for (auto item : m_free) {
263 delete[] item;
264 }
265 m_gl->makeCurrent();
266#if defined(_WIN32) && defined(USE_EPOXY)
267 epoxy_handle_external_wglMakeCurrent();
268#endif
269#if !defined(_WIN32) || defined(USE_EPOXY)
270 if (m_shader.passes) {
271 mGLES2ShaderFree(&m_shader);
272 }
273#endif
274 m_backend->deinit(m_backend);
275 m_gl->doneCurrent();
276 free(m_backend);
277 m_backend = nullptr;
278}
279
280void PainterGL::setContext(std::shared_ptr<CoreController> context) {
281 m_context = context;
282 resizeContext();
283}
284
285void PainterGL::resizeContext() {
286 if (!m_context) {
287 return;
288 }
289
290 if (!m_active) {
291 m_gl->makeCurrent();
292#if defined(_WIN32) && defined(USE_EPOXY)
293 epoxy_handle_external_wglMakeCurrent();
294#endif
295 }
296
297 QSize size = m_context->screenDimensions();
298 m_backend->setDimensions(m_backend, size.width(), size.height());
299 if (!m_active) {
300 m_gl->doneCurrent();
301 }
302}
303
304void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
305 m_messagePainter = messagePainter;
306}
307
308void PainterGL::resize(const QSize& size) {
309 m_size = size;
310 if (m_started && !m_active) {
311 forceDraw();
312 }
313}
314
315void PainterGL::lockAspectRatio(bool lock) {
316 m_backend->lockAspectRatio = lock;
317 if (m_started && !m_active) {
318 forceDraw();
319 }
320}
321
322void PainterGL::lockIntegerScaling(bool lock) {
323 m_backend->lockIntegerScaling = lock;
324 if (m_started && !m_active) {
325 forceDraw();
326 }
327}
328
329void PainterGL::filter(bool filter) {
330 m_backend->filter = filter;
331 if (m_started && !m_active) {
332 forceDraw();
333 }
334}
335
336void PainterGL::start() {
337 m_gl->makeCurrent();
338#if defined(_WIN32) && defined(USE_EPOXY)
339 epoxy_handle_external_wglMakeCurrent();
340#endif
341
342#if !defined(_WIN32) || defined(USE_EPOXY)
343 if (m_supportsShaders && m_shader.passes) {
344 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
345 }
346#endif
347
348 m_active = true;
349 m_started = true;
350}
351
352void PainterGL::draw() {
353 if (m_queue.isEmpty()) {
354 return;
355 }
356
357 if (mCoreSyncWaitFrameStart(&m_context->thread()->impl->sync) || !m_queue.isEmpty()) {
358 dequeue();
359 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
360 m_painter.begin(m_gl->context()->device());
361 performDraw();
362 m_painter.end();
363 m_backend->swap(m_backend);
364 if (!m_delayTimer.isValid()) {
365 m_delayTimer.start();
366 } else if (m_gl->format().swapInterval()) {
367 while (m_delayTimer.elapsed() < 15) {
368 QThread::usleep(100);
369 }
370 m_delayTimer.restart();
371 }
372 } else {
373 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
374 }
375 if (!m_queue.isEmpty()) {
376 QMetaObject::invokeMethod(this, "draw", Qt::QueuedConnection);
377 }
378}
379
380void PainterGL::forceDraw() {
381 m_painter.begin(m_gl->context()->device());
382 performDraw();
383 m_painter.end();
384 m_backend->swap(m_backend);
385}
386
387void PainterGL::stop() {
388 m_active = false;
389 m_started = false;
390 dequeueAll();
391 m_backend->clear(m_backend);
392 m_backend->swap(m_backend);
393 m_gl->doneCurrent();
394 m_gl->context()->moveToThread(m_gl->thread());
395 m_context.reset();
396 moveToThread(m_gl->thread());
397 m_videoProxy->moveToThread(m_gl->thread());
398}
399
400void PainterGL::pause() {
401 m_active = false;
402}
403
404void PainterGL::unpause() {
405 m_active = true;
406}
407
408void PainterGL::performDraw() {
409 m_painter.beginNativePainting();
410#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
411 float r = m_gl->devicePixelRatioF();
412#else
413 float r = m_gl->devicePixelRatio();
414#endif
415 m_backend->resized(m_backend, m_size.width() * r, m_size.height() * r);
416 m_backend->drawFrame(m_backend);
417 m_painter.endNativePainting();
418 if (m_messagePainter) {
419 m_messagePainter->paint(&m_painter);
420 }
421}
422
423void PainterGL::enqueue(const uint32_t* backing) {
424 m_mutex.lock();
425 uint32_t* buffer;
426 if (m_free.isEmpty()) {
427 buffer = m_queue.dequeue();
428 } else {
429 buffer = m_free.takeLast();
430 }
431 QSize size = m_context->screenDimensions();
432 memcpy(buffer, backing, size.width() * size.height() * BYTES_PER_PIXEL);
433 m_queue.enqueue(buffer);
434 m_mutex.unlock();
435}
436
437void PainterGL::dequeue() {
438 m_mutex.lock();
439 if (m_queue.isEmpty()) {
440 m_mutex.unlock();
441 return;
442 }
443 uint32_t* buffer = m_queue.dequeue();
444 m_backend->postFrame(m_backend, buffer);
445 m_free.append(buffer);
446 m_mutex.unlock();
447}
448
449void PainterGL::dequeueAll() {
450 uint32_t* buffer = 0;
451 m_mutex.lock();
452 while (!m_queue.isEmpty()) {
453 buffer = m_queue.dequeue();
454 m_free.append(buffer);
455 }
456 if (buffer) {
457 m_backend->postFrame(m_backend, buffer);
458 }
459 m_mutex.unlock();
460}
461
462void PainterGL::setShaders(struct VDir* dir) {
463 if (!supportsShaders()) {
464 return;
465 }
466 if (!m_active) {
467#if !defined(_WIN32) || defined(USE_EPOXY)
468 m_gl->makeCurrent();
469#if defined(_WIN32) && defined(USE_EPOXY)
470 epoxy_handle_external_wglMakeCurrent();
471#endif
472 }
473 if (m_shader.passes) {
474 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
475 mGLES2ShaderFree(&m_shader);
476 }
477 mGLES2ShaderLoad(&m_shader, dir);
478 if (m_started) {
479 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
480 }
481 if (!m_active) {
482 m_gl->doneCurrent();
483 }
484#endif
485}
486
487void PainterGL::clearShaders() {
488 if (!supportsShaders()) {
489 return;
490 }
491 if (!m_active) {
492#if !defined(_WIN32) || defined(USE_EPOXY)
493 m_gl->makeCurrent();
494#if defined(_WIN32) && defined(USE_EPOXY)
495 epoxy_handle_external_wglMakeCurrent();
496#endif
497 }
498 if (m_shader.passes) {
499 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
500 mGLES2ShaderFree(&m_shader);
501 }
502 if (!m_active) {
503 m_gl->doneCurrent();
504 }
505#endif
506}
507
508VideoShader* PainterGL::shaders() {
509 return &m_shader;
510}
511
512#endif