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 <QResizeEvent>
16#include <QTimer>
17#include <QWindow>
18
19#include <mgba/core/core.h>
20#include <mgba-util/math.h>
21#ifdef BUILD_GL
22#include "platform/opengl/gl.h"
23#endif
24#ifdef BUILD_GLES2
25#include "platform/opengl/gles2.h"
26#ifdef _WIN32
27#include <epoxy/wgl.h>
28#endif
29#endif
30
31using namespace QGBA;
32
33DisplayGL::DisplayGL(const QSurfaceFormat& format, QWidget* parent)
34 : Display(parent)
35 , m_gl(nullptr)
36{
37 setAttribute(Qt::WA_NativeWindow);
38 windowHandle()->create();
39
40 // This can spontaneously re-enter into this->resizeEvent before creation is done, so we
41 // need to make sure it's initialized to nullptr before we assign the new object to it
42 m_gl = new QOpenGLContext;
43 m_gl->setFormat(format);
44 m_gl->create();
45
46 m_gl->makeCurrent(windowHandle());
47#if defined(_WIN32) && defined(USE_EPOXY)
48 epoxy_handle_external_wglMakeCurrent();
49#endif
50 auto version = m_gl->format().version();
51 QStringList extensions = QString(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS))).split(' ');
52
53 int forceVersion = 0;
54 if (format.majorVersion() < 2) {
55 forceVersion = 1;
56 }
57
58 if ((version == qMakePair(2, 1) && !extensions.contains("GL_ARB_framebuffer_object")) || version == qMakePair(2, 0)) {
59 QSurfaceFormat newFormat(format);
60 newFormat.setVersion(1, 4);
61 forceVersion = 1;
62 m_gl->setFormat(newFormat);
63 m_gl->create();
64 }
65
66 m_painter = new PainterGL(windowHandle(), m_gl, forceVersion);
67}
68
69DisplayGL::~DisplayGL() {
70 stopDrawing();
71 delete m_painter;
72 delete m_gl;
73}
74
75bool DisplayGL::supportsShaders() const {
76 return m_painter->supportsShaders();
77}
78
79VideoShader* DisplayGL::shaders() {
80 VideoShader* shaders = nullptr;
81 if (m_drawThread) {
82 QMetaObject::invokeMethod(m_painter, "shaders", Qt::BlockingQueuedConnection, Q_RETURN_ARG(VideoShader*, shaders));
83 } else {
84 shaders = m_painter->shaders();
85 }
86 return shaders;
87}
88
89void DisplayGL::startDrawing(std::shared_ptr<CoreController> controller) {
90 if (m_drawThread) {
91 return;
92 }
93 m_isDrawing = true;
94 m_painter->setContext(controller);
95 m_painter->setMessagePainter(messagePainter());
96 m_context = controller;
97 m_painter->resize(size());
98 m_drawThread = new QThread(this);
99 m_drawThread->setObjectName("Painter Thread");
100 m_gl->doneCurrent();
101 m_gl->moveToThread(m_drawThread);
102 m_painter->moveToThread(m_drawThread);
103 if (videoProxy()) {
104 videoProxy()->moveToThread(m_drawThread);
105 }
106 connect(m_drawThread, &QThread::started, m_painter, &PainterGL::start);
107 m_drawThread->start();
108
109 lockAspectRatio(isAspectRatioLocked());
110 lockIntegerScaling(isIntegerScalingLocked());
111 interframeBlending(hasInterframeBlending());
112 filter(isFiltered());
113#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
114 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatioF());
115#else
116 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatio());
117#endif
118 resizePainter();
119}
120
121void DisplayGL::stopDrawing() {
122 if (m_drawThread) {
123 m_isDrawing = false;
124 CoreController::Interrupter interrupter(m_context);
125 QMetaObject::invokeMethod(m_painter, "stop", Qt::BlockingQueuedConnection);
126 m_drawThread->exit();
127 m_drawThread = nullptr;
128
129 m_gl->makeCurrent(windowHandle());
130#if defined(_WIN32) && defined(USE_EPOXY)
131 epoxy_handle_external_wglMakeCurrent();
132#endif
133 }
134 m_context.reset();
135}
136
137void DisplayGL::pauseDrawing() {
138 if (m_drawThread) {
139 m_isDrawing = false;
140 CoreController::Interrupter interrupter(m_context);
141 QMetaObject::invokeMethod(m_painter, "pause", Qt::BlockingQueuedConnection);
142 }
143}
144
145void DisplayGL::unpauseDrawing() {
146 if (m_drawThread) {
147 m_isDrawing = true;
148 CoreController::Interrupter interrupter(m_context);
149 QMetaObject::invokeMethod(m_painter, "unpause", Qt::BlockingQueuedConnection);
150 }
151}
152
153void DisplayGL::forceDraw() {
154 if (m_drawThread) {
155 QMetaObject::invokeMethod(m_painter, "forceDraw");
156 }
157}
158
159void DisplayGL::lockAspectRatio(bool lock) {
160 Display::lockAspectRatio(lock);
161 if (m_drawThread) {
162 QMetaObject::invokeMethod(m_painter, "lockAspectRatio", Q_ARG(bool, lock));
163 }
164}
165
166void DisplayGL::lockIntegerScaling(bool lock) {
167 Display::lockIntegerScaling(lock);
168 if (m_drawThread) {
169 QMetaObject::invokeMethod(m_painter, "lockIntegerScaling", Q_ARG(bool, lock));
170 }
171}
172
173void DisplayGL::interframeBlending(bool enable) {
174 Display::interframeBlending(enable);
175 if (m_drawThread) {
176 QMetaObject::invokeMethod(m_painter, "interframeBlending", Q_ARG(bool, enable));
177 }
178}
179
180void DisplayGL::filter(bool filter) {
181 Display::filter(filter);
182 if (m_drawThread) {
183 QMetaObject::invokeMethod(m_painter, "filter", Q_ARG(bool, filter));
184 }
185}
186
187void DisplayGL::framePosted() {
188 if (m_drawThread) {
189 m_painter->enqueue(m_context->drawContext());
190 QMetaObject::invokeMethod(m_painter, "draw");
191 }
192}
193
194void DisplayGL::setShaders(struct VDir* shaders) {
195 if (m_drawThread) {
196 QMetaObject::invokeMethod(m_painter, "setShaders", Qt::BlockingQueuedConnection, Q_ARG(struct VDir*, shaders));
197 } else {
198 m_painter->setShaders(shaders);
199 }
200}
201
202void DisplayGL::clearShaders() {
203 QMetaObject::invokeMethod(m_painter, "clearShaders");
204}
205
206
207void DisplayGL::resizeContext() {
208 if (m_drawThread) {
209 m_isDrawing = false;
210 CoreController::Interrupter interrupter(m_context);
211 QMetaObject::invokeMethod(m_painter, "resizeContext", Qt::BlockingQueuedConnection);
212 }
213}
214
215void DisplayGL::resizeEvent(QResizeEvent* event) {
216 Display::resizeEvent(event);
217 resizePainter();
218}
219
220void DisplayGL::resizePainter() {
221 if (m_drawThread) {
222 QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, size()));
223 }
224}
225
226void DisplayGL::setVideoProxy(std::shared_ptr<VideoProxy> proxy) {
227 Display::setVideoProxy(proxy);
228 if (m_drawThread && proxy) {
229 proxy->moveToThread(m_drawThread);
230 }
231 m_painter->setVideoProxy(proxy);
232}
233
234int DisplayGL::framebufferHandle() {
235 return m_painter->glTex();
236}
237
238PainterGL::PainterGL(QWindow* surface, QOpenGLContext* parent, int forceVersion)
239 : m_gl(parent)
240 , m_surface(surface)
241{
242#ifdef BUILD_GL
243 mGLContext* glBackend;
244#endif
245#ifdef BUILD_GLES2
246 mGLES2Context* gl2Backend;
247#endif
248
249 m_gl->makeCurrent(m_surface);
250 m_window = new QOpenGLPaintDevice;
251#if defined(_WIN32) && defined(USE_EPOXY)
252 epoxy_handle_external_wglMakeCurrent();
253#endif
254
255#ifdef BUILD_GLES2
256 auto version = m_gl->format().version();
257 QStringList extensions = QString(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS))).split(' ');
258 if (forceVersion != 1 && ((version == qMakePair(2, 1) && extensions.contains("GL_ARB_framebuffer_object")) || version.first > 2)) {
259 gl2Backend = static_cast<mGLES2Context*>(malloc(sizeof(mGLES2Context)));
260 mGLES2ContextCreate(gl2Backend);
261 m_backend = &gl2Backend->d;
262 m_supportsShaders = true;
263 }
264#endif
265
266#ifdef BUILD_GL
267 if (!m_backend) {
268 glBackend = static_cast<mGLContext*>(malloc(sizeof(mGLContext)));
269 mGLContextCreate(glBackend);
270 m_backend = &glBackend->d;
271 m_supportsShaders = false;
272 }
273#endif
274 m_backend->swap = [](VideoBackend* v) {
275 PainterGL* painter = static_cast<PainterGL*>(v->user);
276 if (!painter->m_swapTimer.isActive()) {
277 QMetaObject::invokeMethod(&painter->m_swapTimer, "start");
278 }
279 };
280
281 m_backend->init(m_backend, 0);
282#ifdef BUILD_GLES2
283 if (m_supportsShaders) {
284 m_shader.preprocessShader = static_cast<void*>(&reinterpret_cast<mGLES2Context*>(m_backend)->initialShader);
285 }
286#endif
287
288 m_backend->user = this;
289 m_backend->filter = false;
290 m_backend->lockAspectRatio = false;
291 m_backend->interframeBlending = false;
292
293 for (int i = 0; i < 2; ++i) {
294 m_free.append(new uint32_t[1024 * 2048]);
295 }
296
297 m_swapTimer.setInterval(16);
298 m_swapTimer.setSingleShot(true);
299 connect(&m_swapTimer, &QTimer::timeout, this, &PainterGL::swap);
300}
301
302PainterGL::~PainterGL() {
303 while (!m_queue.isEmpty()) {
304 delete[] m_queue.dequeue();
305 }
306 for (auto item : m_free) {
307 delete[] item;
308 }
309 m_gl->makeCurrent(m_surface);
310#if defined(_WIN32) && defined(USE_EPOXY)
311 epoxy_handle_external_wglMakeCurrent();
312#endif
313#ifdef BUILD_GLES2
314 if (m_shader.passes) {
315 mGLES2ShaderFree(&m_shader);
316 }
317#endif
318 m_backend->deinit(m_backend);
319 m_gl->doneCurrent();
320 free(m_backend);
321 m_backend = nullptr;
322 delete m_window;
323}
324
325void PainterGL::setContext(std::shared_ptr<CoreController> context) {
326 m_context = context;
327 resizeContext();
328}
329
330void PainterGL::resizeContext() {
331 if (!m_context) {
332 return;
333 }
334
335 QSize size = m_context->screenDimensions();
336 m_backend->setDimensions(m_backend, size.width(), size.height());
337}
338
339void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
340 m_messagePainter = messagePainter;
341}
342
343void PainterGL::resize(const QSize& size) {
344 m_size = size;
345 if (m_started && !m_active) {
346 forceDraw();
347 }
348}
349
350void PainterGL::lockAspectRatio(bool lock) {
351 m_backend->lockAspectRatio = lock;
352 resize(m_size);
353}
354
355void PainterGL::lockIntegerScaling(bool lock) {
356 m_backend->lockIntegerScaling = lock;
357 resize(m_size);
358}
359
360void PainterGL::interframeBlending(bool enable) {
361 m_backend->interframeBlending = enable;
362}
363
364void PainterGL::filter(bool filter) {
365 m_backend->filter = filter;
366 if (m_started && !m_active) {
367 forceDraw();
368 }
369}
370
371void PainterGL::start() {
372 m_gl->makeCurrent(m_surface);
373#if defined(_WIN32) && defined(USE_EPOXY)
374 epoxy_handle_external_wglMakeCurrent();
375#endif
376
377#ifdef BUILD_GLES2
378 if (m_supportsShaders && m_shader.passes) {
379 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
380 }
381#endif
382
383 m_active = true;
384 m_started = true;
385}
386
387void PainterGL::draw() {
388 if (m_queue.isEmpty()) {
389 return;
390 }
391
392 if (m_needsUnlock) {
393 QTimer::singleShot(0, this, &PainterGL::draw);
394 return;
395 }
396
397 if (mCoreSyncWaitFrameStart(&m_context->thread()->impl->sync) || !m_queue.isEmpty()) {
398 dequeue();
399 forceDraw();
400 if (m_context->thread()->impl->sync.videoFrameWait) {
401 m_needsUnlock = true;
402 } else {
403 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
404 }
405 } else {
406 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
407 }
408}
409
410void PainterGL::forceDraw() {
411 m_painter.begin(m_window);
412 performDraw();
413 m_painter.end();
414 m_backend->swap(m_backend);
415}
416
417void PainterGL::stop() {
418 m_active = false;
419 m_started = false;
420 dequeueAll();
421 m_backend->clear(m_backend);
422 m_backend->swap(m_backend);
423 if (m_swapTimer.isActive()) {
424 swap();
425 m_swapTimer.stop();
426 }
427 if (m_videoProxy) {
428 m_videoProxy->reset();
429 }
430 m_gl->doneCurrent();
431 m_gl->moveToThread(m_surface->thread());
432 m_context.reset();
433 moveToThread(m_gl->thread());
434 if (m_videoProxy) {
435 m_videoProxy->moveToThread(m_gl->thread());
436 }
437}
438
439void PainterGL::pause() {
440 m_active = false;
441}
442
443void PainterGL::unpause() {
444 m_active = true;
445}
446
447void PainterGL::performDraw() {
448 m_painter.beginNativePainting();
449 float r = m_surface->devicePixelRatio();
450 m_backend->resized(m_backend, m_size.width() * r, m_size.height() * r);
451 m_backend->drawFrame(m_backend);
452 m_painter.endNativePainting();
453 if (m_messagePainter) {
454 m_messagePainter->paint(&m_painter);
455 }
456 m_frameReady = true;
457}
458
459void PainterGL::swap() {
460 if (!m_gl->isValid()) {
461 return;
462 }
463 if (m_frameReady) {
464 m_gl->swapBuffers(m_surface);
465 m_gl->makeCurrent(m_surface);
466#if defined(_WIN32) && defined(USE_EPOXY)
467 epoxy_handle_external_wglMakeCurrent();
468#endif
469 m_frameReady = false;
470 }
471 if (m_needsUnlock) {
472 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
473 m_needsUnlock = false;
474 }
475 if (!m_queue.isEmpty()) {
476 QMetaObject::invokeMethod(this, "draw", Qt::QueuedConnection);
477 }
478}
479
480void PainterGL::enqueue(const uint32_t* backing) {
481 m_mutex.lock();
482 uint32_t* buffer = nullptr;
483 if (backing) {
484 if (m_free.isEmpty()) {
485 buffer = m_queue.dequeue();
486 } else {
487 buffer = m_free.takeLast();
488 }
489 QSize size = m_context->screenDimensions();
490 memcpy(buffer, backing, size.width() * size.height() * BYTES_PER_PIXEL);
491 }
492 m_queue.enqueue(buffer);
493 m_mutex.unlock();
494}
495
496void PainterGL::dequeue() {
497 m_mutex.lock();
498 if (m_queue.isEmpty()) {
499 m_mutex.unlock();
500 return;
501 }
502 uint32_t* buffer = m_queue.dequeue();
503 if (buffer) {
504 m_backend->postFrame(m_backend, buffer);
505 m_free.append(buffer);
506 }
507 m_mutex.unlock();
508}
509
510void PainterGL::dequeueAll() {
511 uint32_t* buffer = 0;
512 m_mutex.lock();
513 while (!m_queue.isEmpty()) {
514 buffer = m_queue.dequeue();
515 if (buffer) {
516 m_free.append(buffer);
517 }
518 }
519 if (buffer) {
520 m_backend->postFrame(m_backend, buffer);
521 }
522 m_mutex.unlock();
523}
524
525void PainterGL::setVideoProxy(std::shared_ptr<VideoProxy> proxy) {
526 m_videoProxy = proxy;
527}
528
529void PainterGL::setShaders(struct VDir* dir) {
530 if (!supportsShaders()) {
531 return;
532 }
533#ifdef BUILD_GLES2
534 if (m_shader.passes) {
535 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
536 mGLES2ShaderFree(&m_shader);
537 }
538 mGLES2ShaderLoad(&m_shader, dir);
539 if (m_started) {
540 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
541 }
542#endif
543}
544
545void PainterGL::clearShaders() {
546 if (!supportsShaders()) {
547 return;
548 }
549#ifdef BUILD_GLES2
550 if (m_shader.passes) {
551 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
552 mGLES2ShaderFree(&m_shader);
553 }
554#endif
555}
556
557VideoShader* PainterGL::shaders() {
558 return &m_shader;
559}
560
561int PainterGL::glTex() {
562#ifdef BUILD_GLES2
563 if (supportsShaders()) {
564 mGLES2Context* gl2Backend = reinterpret_cast<mGLES2Context*>(m_backend);
565 return gl2Backend->tex;
566 }
567#endif
568#ifdef BUILD_GL
569 mGLContext* glBackend = reinterpret_cast<mGLContext*>(m_backend);
570 return glBackend->tex[0];
571#else
572 return -1;
573#endif
574}
575
576#endif