src/platform/qt/DisplayGL.cpp (view raw)
1/* Copyright (c) 2013-2019 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 <QOpenGLContext>
14#include <QOpenGLPaintDevice>
15#include <QMutexLocker>
16#include <QResizeEvent>
17#include <QScreen>
18#include <QTimer>
19#include <QWindow>
20
21#include <mgba/core/core.h>
22#include <mgba-util/math.h>
23#ifdef BUILD_GL
24#include "platform/opengl/gl.h"
25#endif
26#ifdef BUILD_GLES2
27#include "platform/opengl/gles2.h"
28#ifdef _WIN32
29#include <epoxy/wgl.h>
30#endif
31#endif
32
33using namespace QGBA;
34
35DisplayGL::DisplayGL(const QSurfaceFormat& format, QWidget* parent)
36 : Display(parent)
37 , m_gl(nullptr)
38{
39 setAttribute(Qt::WA_NativeWindow);
40 windowHandle()->create();
41
42 // This can spontaneously re-enter into this->resizeEvent before creation is done, so we
43 // need to make sure it's initialized to nullptr before we assign the new object to it
44 m_gl = new QOpenGLContext;
45 m_gl->setFormat(format);
46 m_gl->create();
47
48 m_gl->makeCurrent(windowHandle());
49#if defined(_WIN32) && defined(USE_EPOXY)
50 epoxy_handle_external_wglMakeCurrent();
51#endif
52 auto version = m_gl->format().version();
53 QStringList extensions = QString(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS))).split(' ');
54
55 int forceVersion = 0;
56 if (format.majorVersion() < 2) {
57 forceVersion = 1;
58 }
59
60 if ((version == qMakePair(2, 1) && !extensions.contains("GL_ARB_framebuffer_object")) || version == qMakePair(2, 0)) {
61 QSurfaceFormat newFormat(format);
62 newFormat.setVersion(1, 4);
63 forceVersion = 1;
64 m_gl->setFormat(newFormat);
65 m_gl->create();
66 }
67
68 m_painter = new PainterGL(windowHandle(), m_gl, forceVersion);
69}
70
71DisplayGL::~DisplayGL() {
72 stopDrawing();
73 delete m_painter;
74 delete m_gl;
75}
76
77bool DisplayGL::supportsShaders() const {
78 return m_painter->supportsShaders();
79}
80
81VideoShader* DisplayGL::shaders() {
82 VideoShader* shaders = nullptr;
83 if (m_drawThread) {
84 QMetaObject::invokeMethod(m_painter, "shaders", Qt::BlockingQueuedConnection, Q_RETURN_ARG(VideoShader*, shaders));
85 } else {
86 shaders = m_painter->shaders();
87 }
88 return shaders;
89}
90
91void DisplayGL::startDrawing(std::shared_ptr<CoreController> controller) {
92 if (m_drawThread) {
93 return;
94 }
95 m_isDrawing = true;
96 m_painter->setContext(controller);
97 m_painter->setMessagePainter(messagePainter());
98 m_context = controller;
99 m_painter->resize(size());
100 m_drawThread = new QThread(this);
101 m_drawThread->setObjectName("Painter Thread");
102 m_gl->doneCurrent();
103 m_gl->moveToThread(m_drawThread);
104 m_painter->moveToThread(m_drawThread);
105 if (videoProxy()) {
106 videoProxy()->moveToThread(m_drawThread);
107 }
108 connect(m_drawThread, &QThread::started, m_painter, &PainterGL::start);
109 m_drawThread->start();
110
111 lockAspectRatio(isAspectRatioLocked());
112 lockIntegerScaling(isIntegerScalingLocked());
113 interframeBlending(hasInterframeBlending());
114 filter(isFiltered());
115#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
116 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatioF());
117#else
118 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatio());
119#endif
120 resizePainter();
121 setUpdatesEnabled(false);
122}
123
124void DisplayGL::stopDrawing() {
125 if (m_drawThread) {
126 m_isDrawing = false;
127 CoreController::Interrupter interrupter(m_context);
128 QMetaObject::invokeMethod(m_painter, "stop", Qt::BlockingQueuedConnection);
129 m_drawThread->exit();
130 m_drawThread->wait();
131 m_drawThread = nullptr;
132
133 m_gl->makeCurrent(windowHandle());
134#if defined(_WIN32) && defined(USE_EPOXY)
135 epoxy_handle_external_wglMakeCurrent();
136#endif
137 setUpdatesEnabled(true);
138 }
139 m_context.reset();
140}
141
142void DisplayGL::pauseDrawing() {
143 if (m_drawThread) {
144 m_isDrawing = false;
145 CoreController::Interrupter interrupter(m_context);
146 QMetaObject::invokeMethod(m_painter, "pause", Qt::BlockingQueuedConnection);
147 setUpdatesEnabled(true);
148 }
149}
150
151void DisplayGL::unpauseDrawing() {
152 if (m_drawThread) {
153 m_isDrawing = true;
154 CoreController::Interrupter interrupter(m_context);
155 QMetaObject::invokeMethod(m_painter, "unpause", Qt::BlockingQueuedConnection);
156 setUpdatesEnabled(false);
157 }
158}
159
160void DisplayGL::forceDraw() {
161 if (m_drawThread) {
162 QMetaObject::invokeMethod(m_painter, "forceDraw");
163 }
164}
165
166void DisplayGL::lockAspectRatio(bool lock) {
167 Display::lockAspectRatio(lock);
168 if (m_drawThread) {
169 QMetaObject::invokeMethod(m_painter, "lockAspectRatio", Q_ARG(bool, lock));
170 }
171}
172
173void DisplayGL::lockIntegerScaling(bool lock) {
174 Display::lockIntegerScaling(lock);
175 if (m_drawThread) {
176 QMetaObject::invokeMethod(m_painter, "lockIntegerScaling", Q_ARG(bool, lock));
177 }
178}
179
180void DisplayGL::interframeBlending(bool enable) {
181 Display::interframeBlending(enable);
182 if (m_drawThread) {
183 QMetaObject::invokeMethod(m_painter, "interframeBlending", Q_ARG(bool, enable));
184 }
185}
186
187void DisplayGL::filter(bool filter) {
188 Display::filter(filter);
189 if (m_drawThread) {
190 QMetaObject::invokeMethod(m_painter, "filter", Q_ARG(bool, filter));
191 }
192}
193
194void DisplayGL::framePosted() {
195 if (m_drawThread) {
196 m_painter->enqueue(m_context->drawContext());
197 QMetaObject::invokeMethod(m_painter, "draw");
198 }
199}
200
201void DisplayGL::setShaders(struct VDir* shaders) {
202 if (m_drawThread) {
203 QMetaObject::invokeMethod(m_painter, "setShaders", Qt::BlockingQueuedConnection, Q_ARG(struct VDir*, shaders));
204 } else {
205 m_painter->setShaders(shaders);
206 }
207}
208
209void DisplayGL::clearShaders() {
210 QMetaObject::invokeMethod(m_painter, "clearShaders");
211}
212
213
214void DisplayGL::resizeContext() {
215 if (m_drawThread) {
216 m_isDrawing = false;
217 CoreController::Interrupter interrupter(m_context);
218 QMetaObject::invokeMethod(m_painter, "resizeContext", Qt::BlockingQueuedConnection);
219 }
220}
221
222void DisplayGL::resizeEvent(QResizeEvent* event) {
223 Display::resizeEvent(event);
224 resizePainter();
225}
226
227void DisplayGL::resizePainter() {
228 if (m_drawThread) {
229 QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, size()));
230 }
231}
232
233void DisplayGL::setVideoProxy(std::shared_ptr<VideoProxy> proxy) {
234 Display::setVideoProxy(proxy);
235 if (m_drawThread && proxy) {
236 proxy->moveToThread(m_drawThread);
237 }
238 m_painter->setVideoProxy(proxy);
239}
240
241int DisplayGL::framebufferHandle() {
242 return m_painter->glTex();
243}
244
245PainterGL::PainterGL(QWindow* surface, QOpenGLContext* parent, int forceVersion)
246 : m_gl(parent)
247 , m_surface(surface)
248{
249#ifdef BUILD_GL
250 mGLContext* glBackend;
251#endif
252#ifdef BUILD_GLES2
253 mGLES2Context* gl2Backend;
254#endif
255
256 m_gl->makeCurrent(m_surface);
257 m_window = new QOpenGLPaintDevice;
258#if defined(_WIN32) && defined(USE_EPOXY)
259 epoxy_handle_external_wglMakeCurrent();
260#endif
261
262#ifdef BUILD_GLES2
263 auto version = m_gl->format().version();
264 QStringList extensions = QString(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS))).split(' ');
265 if (forceVersion != 1 && ((version == qMakePair(2, 1) && extensions.contains("GL_ARB_framebuffer_object")) || version.first > 2)) {
266 gl2Backend = static_cast<mGLES2Context*>(malloc(sizeof(mGLES2Context)));
267 mGLES2ContextCreate(gl2Backend);
268 m_backend = &gl2Backend->d;
269 m_supportsShaders = true;
270 }
271#endif
272
273#ifdef BUILD_GL
274 if (!m_backend) {
275 glBackend = static_cast<mGLContext*>(malloc(sizeof(mGLContext)));
276 mGLContextCreate(glBackend);
277 m_backend = &glBackend->d;
278 m_supportsShaders = false;
279 }
280#endif
281 m_backend->swap = [](VideoBackend* v) {
282 PainterGL* painter = static_cast<PainterGL*>(v->user);
283 if (!painter->m_gl->isValid()) {
284 return;
285 }
286 painter->m_gl->swapBuffers(painter->m_surface);
287 painter->m_gl->makeCurrent(painter->m_surface);
288#if defined(_WIN32) && defined(USE_EPOXY)
289 epoxy_handle_external_wglMakeCurrent();
290#endif
291 };
292
293 m_backend->init(m_backend, 0);
294#ifdef BUILD_GLES2
295 if (m_supportsShaders) {
296 m_shader.preprocessShader = static_cast<void*>(&reinterpret_cast<mGLES2Context*>(m_backend)->initialShader);
297 }
298#endif
299
300 m_backend->user = this;
301 m_backend->filter = false;
302 m_backend->lockAspectRatio = false;
303 m_backend->interframeBlending = false;
304
305 for (int i = 0; i < 2; ++i) {
306 m_free.append(new uint32_t[1024 * 2048]);
307 }
308}
309
310PainterGL::~PainterGL() {
311 while (!m_queue.isEmpty()) {
312 delete[] m_queue.dequeue();
313 }
314 for (auto item : m_free) {
315 delete[] item;
316 }
317 m_gl->makeCurrent(m_surface);
318#if defined(_WIN32) && defined(USE_EPOXY)
319 epoxy_handle_external_wglMakeCurrent();
320#endif
321#ifdef BUILD_GLES2
322 if (m_shader.passes) {
323 mGLES2ShaderFree(&m_shader);
324 }
325#endif
326 m_backend->deinit(m_backend);
327 m_gl->doneCurrent();
328 free(m_backend);
329 m_backend = nullptr;
330 delete m_window;
331}
332
333void PainterGL::setContext(std::shared_ptr<CoreController> context) {
334 m_context = context;
335 resizeContext();
336}
337
338void PainterGL::resizeContext() {
339 if (!m_context) {
340 return;
341 }
342
343 QSize size = m_context->screenDimensions();
344 m_backend->setDimensions(m_backend, size.width(), size.height());
345}
346
347void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
348 m_messagePainter = messagePainter;
349}
350
351void PainterGL::resize(const QSize& size) {
352 m_size = size;
353 if (m_started && !m_active) {
354 forceDraw();
355 }
356}
357
358void PainterGL::lockAspectRatio(bool lock) {
359 m_backend->lockAspectRatio = lock;
360 resize(m_size);
361}
362
363void PainterGL::lockIntegerScaling(bool lock) {
364 m_backend->lockIntegerScaling = lock;
365 resize(m_size);
366}
367
368void PainterGL::interframeBlending(bool enable) {
369 m_backend->interframeBlending = enable;
370}
371
372void PainterGL::filter(bool filter) {
373 m_backend->filter = filter;
374 if (m_started && !m_active) {
375 forceDraw();
376 }
377}
378
379void PainterGL::start() {
380 m_gl->makeCurrent(m_surface);
381#if defined(_WIN32) && defined(USE_EPOXY)
382 epoxy_handle_external_wglMakeCurrent();
383#endif
384
385#ifdef BUILD_GLES2
386 if (m_supportsShaders && m_shader.passes) {
387 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
388 }
389#endif
390
391 m_active = true;
392 m_started = true;
393}
394
395void PainterGL::draw() {
396 if (!m_active || m_queue.isEmpty()) {
397 return;
398 }
399 mCoreSync* sync = &m_context->thread()->impl->sync;
400 mCoreSyncWaitFrameStart(sync);
401 dequeue();
402 if (!m_delayTimer.isValid()) {
403 m_delayTimer.start();
404 } else if (sync->audioWait || sync->videoFrameWait) {
405 while (m_delayTimer.nsecsElapsed() + 2000000 < 1000000000 / sync->fpsTarget) {
406 QThread::usleep(500);
407 }
408 m_delayTimer.restart();
409 }
410 mCoreSyncWaitFrameEnd(sync);
411
412 forceDraw();
413}
414
415void PainterGL::forceDraw() {
416 m_painter.begin(m_window);
417 performDraw();
418 m_painter.end();
419 if (!m_context->thread()->impl->sync.audioWait && !m_context->thread()->impl->sync.videoFrameWait) {
420 if (m_delayTimer.elapsed() < 1000 / m_surface->screen()->refreshRate()) {
421 return;
422 }
423 m_delayTimer.restart();
424 }
425 m_backend->swap(m_backend);
426}
427
428void PainterGL::stop() {
429 m_active = false;
430 m_started = false;
431 dequeueAll();
432 m_backend->clear(m_backend);
433 m_backend->swap(m_backend);
434 if (m_videoProxy) {
435 m_videoProxy->reset();
436 }
437 m_gl->doneCurrent();
438 m_gl->moveToThread(m_surface->thread());
439 m_context.reset();
440 moveToThread(m_gl->thread());
441 if (m_videoProxy) {
442 m_videoProxy->moveToThread(m_gl->thread());
443 }
444}
445
446void PainterGL::pause() {
447 m_active = false;
448}
449
450void PainterGL::unpause() {
451 m_active = true;
452}
453
454void PainterGL::performDraw() {
455 m_painter.beginNativePainting();
456 float r = m_surface->devicePixelRatio();
457 m_backend->resized(m_backend, m_size.width() * r, m_size.height() * r);
458 m_backend->drawFrame(m_backend);
459 m_painter.endNativePainting();
460 if (m_messagePainter) {
461 m_messagePainter->paint(&m_painter);
462 }
463}
464
465void PainterGL::enqueue(const uint32_t* backing) {
466 m_mutex.lock();
467 uint32_t* buffer = nullptr;
468 if (backing) {
469 if (m_free.isEmpty()) {
470 buffer = m_queue.dequeue();
471 } else {
472 buffer = m_free.takeLast();
473 }
474 QSize size = m_context->screenDimensions();
475 memcpy(buffer, backing, size.width() * size.height() * BYTES_PER_PIXEL);
476 }
477 m_queue.enqueue(buffer);
478 m_mutex.unlock();
479}
480
481void PainterGL::dequeue() {
482 m_mutex.lock();
483 if (m_queue.isEmpty()) {
484 m_mutex.unlock();
485 return;
486 }
487 uint32_t* buffer = m_queue.dequeue();
488 if (buffer) {
489 m_backend->postFrame(m_backend, buffer);
490 m_free.append(buffer);
491 }
492 m_mutex.unlock();
493}
494
495void PainterGL::dequeueAll() {
496 uint32_t* buffer = 0;
497 m_mutex.lock();
498 while (!m_queue.isEmpty()) {
499 buffer = m_queue.dequeue();
500 if (buffer) {
501 m_free.append(buffer);
502 }
503 }
504 if (buffer) {
505 m_backend->postFrame(m_backend, buffer);
506 }
507 m_mutex.unlock();
508}
509
510void PainterGL::setVideoProxy(std::shared_ptr<VideoProxy> proxy) {
511 m_videoProxy = proxy;
512}
513
514void PainterGL::setShaders(struct VDir* dir) {
515 if (!supportsShaders()) {
516 return;
517 }
518#ifdef BUILD_GLES2
519 if (!m_started) {
520 m_gl->makeCurrent(m_surface);
521#if defined(_WIN32) && defined(USE_EPOXY)
522 epoxy_handle_external_wglMakeCurrent();
523#endif
524 }
525 if (m_shader.passes) {
526 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
527 mGLES2ShaderFree(&m_shader);
528 }
529 mGLES2ShaderLoad(&m_shader, dir);
530 if (m_started) {
531 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
532 } else {
533 m_gl->doneCurrent();
534 }
535#endif
536}
537
538void PainterGL::clearShaders() {
539 if (!supportsShaders()) {
540 return;
541 }
542#ifdef BUILD_GLES2
543 if (m_shader.passes) {
544 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
545 mGLES2ShaderFree(&m_shader);
546 }
547#endif
548}
549
550VideoShader* PainterGL::shaders() {
551 return &m_shader;
552}
553
554int PainterGL::glTex() {
555#ifdef BUILD_GLES2
556 if (supportsShaders()) {
557 mGLES2Context* gl2Backend = reinterpret_cast<mGLES2Context*>(m_backend);
558 return gl2Backend->tex;
559 }
560#endif
561#ifdef BUILD_GL
562 mGLContext* glBackend = reinterpret_cast<mGLContext*>(m_backend);
563 return glBackend->tex[0];
564#else
565 return -1;
566#endif
567}
568
569#endif