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