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 QSize dims = controller->screenDimensions();
96 setSystemDimensions(dims.width(), dims.height());
97
98 m_isDrawing = true;
99 m_painter->setContext(controller);
100 m_painter->setMessagePainter(messagePainter());
101 m_context = controller;
102 m_painter->resize(size());
103 m_drawThread = new QThread(this);
104 m_drawThread->setObjectName("Painter Thread");
105 m_gl->doneCurrent();
106 m_gl->moveToThread(m_drawThread);
107 m_painter->moveToThread(m_drawThread);
108 if (videoProxy()) {
109 videoProxy()->moveToThread(m_drawThread);
110 }
111 connect(m_drawThread, &QThread::started, m_painter, &PainterGL::start);
112 m_drawThread->start();
113
114 lockAspectRatio(isAspectRatioLocked());
115 lockIntegerScaling(isIntegerScalingLocked());
116 interframeBlending(hasInterframeBlending());
117 filter(isFiltered());
118#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
119 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatioF());
120#else
121 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatio());
122#endif
123 resizePainter();
124 setUpdatesEnabled(false);
125}
126
127void DisplayGL::stopDrawing() {
128 if (m_drawThread) {
129 m_isDrawing = false;
130 CoreController::Interrupter interrupter(m_context);
131 QMetaObject::invokeMethod(m_painter, "stop", Qt::BlockingQueuedConnection);
132 m_drawThread->exit();
133 m_drawThread->wait();
134 m_drawThread = nullptr;
135
136 m_gl->makeCurrent(windowHandle());
137#if defined(_WIN32) && defined(USE_EPOXY)
138 epoxy_handle_external_wglMakeCurrent();
139#endif
140 setUpdatesEnabled(true);
141 }
142 m_context.reset();
143}
144
145void DisplayGL::pauseDrawing() {
146 if (m_drawThread) {
147 m_isDrawing = false;
148 CoreController::Interrupter interrupter(m_context);
149 QMetaObject::invokeMethod(m_painter, "pause", Qt::BlockingQueuedConnection);
150 setUpdatesEnabled(true);
151 }
152}
153
154void DisplayGL::unpauseDrawing() {
155 if (m_drawThread) {
156 m_isDrawing = true;
157 CoreController::Interrupter interrupter(m_context);
158 QMetaObject::invokeMethod(m_painter, "unpause", Qt::BlockingQueuedConnection);
159 setUpdatesEnabled(false);
160 }
161}
162
163void DisplayGL::forceDraw() {
164 if (m_drawThread) {
165 QMetaObject::invokeMethod(m_painter, "forceDraw");
166 }
167}
168
169void DisplayGL::lockAspectRatio(bool lock) {
170 Display::lockAspectRatio(lock);
171 if (m_drawThread) {
172 QMetaObject::invokeMethod(m_painter, "lockAspectRatio", Q_ARG(bool, lock));
173 }
174}
175
176void DisplayGL::lockIntegerScaling(bool lock) {
177 Display::lockIntegerScaling(lock);
178 if (m_drawThread) {
179 QMetaObject::invokeMethod(m_painter, "lockIntegerScaling", Q_ARG(bool, lock));
180 }
181}
182
183void DisplayGL::interframeBlending(bool enable) {
184 Display::interframeBlending(enable);
185 if (m_drawThread) {
186 QMetaObject::invokeMethod(m_painter, "interframeBlending", Q_ARG(bool, enable));
187 }
188}
189
190void DisplayGL::filter(bool filter) {
191 Display::filter(filter);
192 if (m_drawThread) {
193 QMetaObject::invokeMethod(m_painter, "filter", Q_ARG(bool, filter));
194 }
195}
196
197void DisplayGL::framePosted() {
198 if (m_drawThread) {
199 m_painter->enqueue(m_context->drawContext());
200 QMetaObject::invokeMethod(m_painter, "draw");
201 }
202}
203
204void DisplayGL::setShaders(struct VDir* shaders) {
205 if (m_drawThread) {
206 QMetaObject::invokeMethod(m_painter, "setShaders", Qt::BlockingQueuedConnection, Q_ARG(struct VDir*, shaders));
207 } else {
208 m_painter->setShaders(shaders);
209 }
210}
211
212void DisplayGL::clearShaders() {
213 QMetaObject::invokeMethod(m_painter, "clearShaders");
214}
215
216
217void DisplayGL::resizeContext() {
218 if (m_drawThread) {
219 m_isDrawing = false;
220 CoreController::Interrupter interrupter(m_context);
221 QMetaObject::invokeMethod(m_painter, "resizeContext", Qt::BlockingQueuedConnection);
222 }
223}
224
225void DisplayGL::resizeEvent(QResizeEvent* event) {
226 Display::resizeEvent(event);
227 resizePainter();
228}
229
230void DisplayGL::resizePainter() {
231 if (m_drawThread) {
232 QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, size()));
233 }
234}
235
236void DisplayGL::setVideoProxy(std::shared_ptr<VideoProxy> proxy) {
237 Display::setVideoProxy(proxy);
238 if (m_drawThread && proxy) {
239 proxy->moveToThread(m_drawThread);
240 }
241 m_painter->setVideoProxy(proxy);
242}
243
244int DisplayGL::framebufferHandle() {
245 return m_painter->glTex();
246}
247
248PainterGL::PainterGL(QWindow* surface, QOpenGLContext* parent, int forceVersion)
249 : m_gl(parent)
250 , m_surface(surface)
251{
252#ifdef BUILD_GL
253 mGLContext* glBackend;
254#endif
255#ifdef BUILD_GLES2
256 mGLES2Context* gl2Backend;
257#endif
258
259 m_gl->makeCurrent(m_surface);
260 m_window = new QOpenGLPaintDevice;
261#if defined(_WIN32) && defined(USE_EPOXY)
262 epoxy_handle_external_wglMakeCurrent();
263#endif
264
265#ifdef BUILD_GLES2
266 auto version = m_gl->format().version();
267 QStringList extensions = QString(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS))).split(' ');
268 if (forceVersion != 1 && ((version == qMakePair(2, 1) && extensions.contains("GL_ARB_framebuffer_object")) || version.first > 2)) {
269 gl2Backend = static_cast<mGLES2Context*>(malloc(sizeof(mGLES2Context)));
270 mGLES2ContextCreate(gl2Backend);
271 m_backend = &gl2Backend->d;
272 m_supportsShaders = true;
273 }
274#endif
275
276#ifdef BUILD_GL
277 if (!m_backend) {
278 glBackend = static_cast<mGLContext*>(malloc(sizeof(mGLContext)));
279 mGLContextCreate(glBackend);
280 m_backend = &glBackend->d;
281 m_supportsShaders = false;
282 }
283#endif
284 m_backend->swap = [](VideoBackend* v) {
285 PainterGL* painter = static_cast<PainterGL*>(v->user);
286 if (!painter->m_gl->isValid()) {
287 return;
288 }
289 painter->m_gl->swapBuffers(painter->m_surface);
290 painter->m_gl->makeCurrent(painter->m_surface);
291#if defined(_WIN32) && defined(USE_EPOXY)
292 epoxy_handle_external_wglMakeCurrent();
293#endif
294 };
295
296 m_backend->init(m_backend, 0);
297#ifdef BUILD_GLES2
298 if (m_supportsShaders) {
299 m_shader.preprocessShader = static_cast<void*>(&reinterpret_cast<mGLES2Context*>(m_backend)->initialShader);
300 }
301#endif
302
303 m_backend->user = this;
304 m_backend->filter = false;
305 m_backend->lockAspectRatio = false;
306 m_backend->interframeBlending = false;
307
308 for (int i = 0; i < 2; ++i) {
309 m_free.append(new uint32_t[256 * 512]);
310 }
311}
312
313PainterGL::~PainterGL() {
314 while (!m_queue.isEmpty()) {
315 delete[] m_queue.dequeue();
316 }
317 for (auto item : m_free) {
318 delete[] item;
319 }
320 m_gl->makeCurrent(m_surface);
321#if defined(_WIN32) && defined(USE_EPOXY)
322 epoxy_handle_external_wglMakeCurrent();
323#endif
324#ifdef BUILD_GLES2
325 if (m_shader.passes) {
326 mGLES2ShaderFree(&m_shader);
327 }
328#endif
329 m_backend->deinit(m_backend);
330 m_gl->doneCurrent();
331 free(m_backend);
332 m_backend = nullptr;
333 delete m_window;
334}
335
336void PainterGL::setContext(std::shared_ptr<CoreController> context) {
337 m_context = context;
338 resizeContext();
339}
340
341void PainterGL::resizeContext() {
342 if (!m_context) {
343 return;
344 }
345
346 QSize size = m_context->screenDimensions();
347 m_backend->setDimensions(m_backend, size.width(), size.height());
348}
349
350void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
351 m_messagePainter = messagePainter;
352}
353
354void PainterGL::resize(const QSize& size) {
355 m_size = size;
356 if (m_started && !m_active) {
357 forceDraw();
358 }
359}
360
361void PainterGL::lockAspectRatio(bool lock) {
362 m_backend->lockAspectRatio = lock;
363 resize(m_size);
364}
365
366void PainterGL::lockIntegerScaling(bool lock) {
367 m_backend->lockIntegerScaling = lock;
368 resize(m_size);
369}
370
371void PainterGL::interframeBlending(bool enable) {
372 m_backend->interframeBlending = enable;
373}
374
375void PainterGL::filter(bool filter) {
376 m_backend->filter = filter;
377 if (m_started && !m_active) {
378 forceDraw();
379 }
380}
381
382void PainterGL::start() {
383 m_gl->makeCurrent(m_surface);
384#if defined(_WIN32) && defined(USE_EPOXY)
385 epoxy_handle_external_wglMakeCurrent();
386#endif
387
388#ifdef BUILD_GLES2
389 if (m_supportsShaders && m_shader.passes) {
390 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
391 }
392#endif
393
394 m_active = true;
395 m_started = true;
396}
397
398void PainterGL::draw() {
399 if (!m_active || m_queue.isEmpty()) {
400 return;
401 }
402 mCoreSync* sync = &m_context->thread()->impl->sync;
403 mCoreSyncWaitFrameStart(sync);
404 dequeue();
405 if (!m_delayTimer.isValid()) {
406 m_delayTimer.start();
407 } else if (sync->audioWait || sync->videoFrameWait) {
408 while (m_delayTimer.nsecsElapsed() + 2000000 < 1000000000 / sync->fpsTarget) {
409 QThread::usleep(500);
410 }
411 m_delayTimer.restart();
412 }
413 mCoreSyncWaitFrameEnd(sync);
414
415 forceDraw();
416}
417
418void PainterGL::forceDraw() {
419 m_painter.begin(m_window);
420 performDraw();
421 m_painter.end();
422 if (!m_context->thread()->impl->sync.audioWait && !m_context->thread()->impl->sync.videoFrameWait) {
423 if (m_delayTimer.elapsed() < 1000 / m_surface->screen()->refreshRate()) {
424 return;
425 }
426 m_delayTimer.restart();
427 }
428 m_backend->swap(m_backend);
429}
430
431void PainterGL::stop() {
432 m_active = false;
433 m_started = false;
434 dequeueAll();
435 m_backend->clear(m_backend);
436 m_backend->swap(m_backend);
437 if (m_videoProxy) {
438 m_videoProxy->reset();
439 }
440 m_gl->doneCurrent();
441 m_gl->moveToThread(m_surface->thread());
442 m_context.reset();
443 moveToThread(m_gl->thread());
444 if (m_videoProxy) {
445 m_videoProxy->moveToThread(m_gl->thread());
446 }
447}
448
449void PainterGL::pause() {
450 m_active = false;
451}
452
453void PainterGL::unpause() {
454 m_active = true;
455}
456
457void PainterGL::performDraw() {
458 m_painter.beginNativePainting();
459 float r = m_surface->devicePixelRatio();
460 m_backend->resized(m_backend, m_size.width() * r, m_size.height() * r);
461 m_backend->drawFrame(m_backend);
462 m_painter.endNativePainting();
463 if (m_messagePainter) {
464 m_messagePainter->paint(&m_painter);
465 }
466}
467
468void PainterGL::enqueue(const uint32_t* backing) {
469 m_mutex.lock();
470 uint32_t* buffer = nullptr;
471 if (backing) {
472 if (m_free.isEmpty()) {
473 buffer = m_queue.dequeue();
474 } else {
475 buffer = m_free.takeLast();
476 }
477 QSize size = m_context->screenDimensions();
478 memcpy(buffer, backing, size.width() * size.height() * BYTES_PER_PIXEL);
479 }
480 m_queue.enqueue(buffer);
481 m_mutex.unlock();
482}
483
484void PainterGL::dequeue() {
485 m_mutex.lock();
486 if (m_queue.isEmpty()) {
487 m_mutex.unlock();
488 return;
489 }
490 uint32_t* buffer = m_queue.dequeue();
491 if (buffer) {
492 m_backend->postFrame(m_backend, buffer);
493 m_free.append(buffer);
494 }
495 m_mutex.unlock();
496}
497
498void PainterGL::dequeueAll() {
499 uint32_t* buffer = 0;
500 m_mutex.lock();
501 while (!m_queue.isEmpty()) {
502 buffer = m_queue.dequeue();
503 if (buffer) {
504 m_free.append(buffer);
505 }
506 }
507 if (buffer) {
508 m_backend->postFrame(m_backend, buffer);
509 }
510 m_mutex.unlock();
511}
512
513void PainterGL::setVideoProxy(std::shared_ptr<VideoProxy> proxy) {
514 m_videoProxy = proxy;
515}
516
517void PainterGL::setShaders(struct VDir* dir) {
518 if (!supportsShaders()) {
519 return;
520 }
521#ifdef BUILD_GLES2
522 if (!m_started) {
523 m_gl->makeCurrent(m_surface);
524#if defined(_WIN32) && defined(USE_EPOXY)
525 epoxy_handle_external_wglMakeCurrent();
526#endif
527 }
528 if (m_shader.passes) {
529 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
530 mGLES2ShaderFree(&m_shader);
531 }
532 mGLES2ShaderLoad(&m_shader, dir);
533 if (m_started) {
534 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
535 } else {
536 m_gl->doneCurrent();
537 }
538#endif
539}
540
541void PainterGL::clearShaders() {
542 if (!supportsShaders()) {
543 return;
544 }
545#ifdef BUILD_GLES2
546 if (m_shader.passes) {
547 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
548 mGLES2ShaderFree(&m_shader);
549 }
550#endif
551}
552
553VideoShader* PainterGL::shaders() {
554 return &m_shader;
555}
556
557int PainterGL::glTex() {
558#ifdef BUILD_GLES2
559 if (supportsShaders()) {
560 mGLES2Context* gl2Backend = reinterpret_cast<mGLES2Context*>(m_backend);
561 return gl2Backend->tex;
562 }
563#endif
564#ifdef BUILD_GL
565 mGLContext* glBackend = reinterpret_cast<mGLContext*>(m_backend);
566 return glBackend->tex[0];
567#else
568 return -1;
569#endif
570}
571
572#endif