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
64DisplayGL::~DisplayGL() {
65 stopDrawing();
66 delete m_painter;
67 delete m_gl;
68}
69
70bool DisplayGL::supportsShaders() const {
71 return m_painter->supportsShaders();
72}
73
74VideoShader* DisplayGL::shaders() {
75 VideoShader* shaders = nullptr;
76 if (m_drawThread) {
77 QMetaObject::invokeMethod(m_painter, "shaders", Qt::BlockingQueuedConnection, Q_RETURN_ARG(VideoShader*, shaders));
78 } else {
79 shaders = m_painter->shaders();
80 }
81 return shaders;
82}
83
84void DisplayGL::startDrawing(std::shared_ptr<CoreController> controller) {
85 if (m_drawThread) {
86 return;
87 }
88 m_isDrawing = true;
89 m_painter->setContext(controller);
90 m_painter->setMessagePainter(messagePainter());
91 m_context = controller;
92 m_painter->resize(size());
93 m_drawThread = new QThread(this);
94 m_drawThread->setObjectName("Painter Thread");
95 m_gl->doneCurrent();
96 m_gl->moveToThread(m_drawThread);
97 m_painter->moveToThread(m_drawThread);
98 m_videoProxy.moveToThread(m_drawThread);
99 connect(m_drawThread, &QThread::started, m_painter, &PainterGL::start);
100 m_drawThread->start();
101
102 lockAspectRatio(isAspectRatioLocked());
103 lockIntegerScaling(isIntegerScalingLocked());
104 filter(isFiltered());
105#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
106 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatioF());
107#else
108 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatio());
109#endif
110 resizePainter();
111}
112
113void DisplayGL::stopDrawing() {
114 if (m_drawThread) {
115 m_isDrawing = false;
116 CoreController::Interrupter interrupter(m_context);
117 QMetaObject::invokeMethod(m_painter, "stop", Qt::BlockingQueuedConnection);
118 m_drawThread->exit();
119 m_drawThread = nullptr;
120
121 m_gl->makeCurrent(windowHandle());
122#if defined(_WIN32) && defined(USE_EPOXY)
123 epoxy_handle_external_wglMakeCurrent();
124#endif
125 }
126 m_context.reset();
127}
128
129void DisplayGL::pauseDrawing() {
130 if (m_drawThread) {
131 m_isDrawing = false;
132 CoreController::Interrupter interrupter(m_context);
133 QMetaObject::invokeMethod(m_painter, "pause", Qt::BlockingQueuedConnection);
134 }
135}
136
137void DisplayGL::unpauseDrawing() {
138 if (m_drawThread) {
139 m_isDrawing = true;
140 CoreController::Interrupter interrupter(m_context);
141 QMetaObject::invokeMethod(m_painter, "unpause", Qt::BlockingQueuedConnection);
142 }
143}
144
145void DisplayGL::forceDraw() {
146 if (m_drawThread) {
147 QMetaObject::invokeMethod(m_painter, "forceDraw");
148 }
149}
150
151void DisplayGL::lockAspectRatio(bool lock) {
152 Display::lockAspectRatio(lock);
153 if (m_drawThread) {
154 QMetaObject::invokeMethod(m_painter, "lockAspectRatio", Q_ARG(bool, lock));
155 }
156}
157
158void DisplayGL::lockIntegerScaling(bool lock) {
159 Display::lockIntegerScaling(lock);
160 if (m_drawThread) {
161 QMetaObject::invokeMethod(m_painter, "lockIntegerScaling", Q_ARG(bool, lock));
162 }
163}
164
165void DisplayGL::filter(bool filter) {
166 Display::filter(filter);
167 if (m_drawThread) {
168 QMetaObject::invokeMethod(m_painter, "filter", Q_ARG(bool, filter));
169 }
170}
171
172void DisplayGL::framePosted() {
173 if (m_drawThread) {
174 m_painter->enqueue(m_context->drawContext());
175 QMetaObject::invokeMethod(m_painter, "draw");
176 }
177}
178
179void DisplayGL::setShaders(struct VDir* shaders) {
180 if (m_drawThread) {
181 QMetaObject::invokeMethod(m_painter, "setShaders", Qt::BlockingQueuedConnection, Q_ARG(struct VDir*, shaders));
182 } else {
183 m_painter->setShaders(shaders);
184 }
185}
186
187void DisplayGL::clearShaders() {
188 QMetaObject::invokeMethod(m_painter, "clearShaders");
189}
190
191
192void DisplayGL::resizeContext() {
193 if (m_drawThread) {
194 m_isDrawing = false;
195 CoreController::Interrupter interrupter(m_context);
196 QMetaObject::invokeMethod(m_painter, "resizeContext", Qt::BlockingQueuedConnection);
197 }
198}
199
200void DisplayGL::resizeEvent(QResizeEvent* event) {
201 Display::resizeEvent(event);
202 resizePainter();
203}
204
205void DisplayGL::resizePainter() {
206 if (m_drawThread) {
207 QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, size()));
208 }
209}
210
211VideoProxy* DisplayGL::videoProxy() {
212 if (supportsShaders()) {
213 return &m_videoProxy;
214 }
215 return nullptr;
216}
217
218int DisplayGL::framebufferHandle() {
219 return m_painter->glTex();
220}
221
222PainterGL::PainterGL(VideoProxy* proxy, QWindow* surface, QOpenGLContext* parent)
223 : m_gl(parent)
224 , m_surface(surface)
225 , m_videoProxy(proxy)
226{
227#ifdef BUILD_GL
228 mGLContext* glBackend;
229#endif
230#ifdef BUILD_GLES2
231 mGLES2Context* gl2Backend;
232#endif
233
234 m_gl->makeCurrent(m_surface);
235 m_window = new QOpenGLPaintDevice;
236#if defined(_WIN32) && defined(USE_EPOXY)
237 epoxy_handle_external_wglMakeCurrent();
238#endif
239 int majorVersion = m_gl->format().majorVersion();
240
241 QStringList extensions = QString(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS))).split(' ');
242
243#ifdef BUILD_GLES2
244 if ((majorVersion == 2 && extensions.contains("GL_ARB_framebuffer_object")) || majorVersion > 2) {
245 gl2Backend = static_cast<mGLES2Context*>(malloc(sizeof(mGLES2Context)));
246 mGLES2ContextCreate(gl2Backend);
247 m_backend = &gl2Backend->d;
248 m_supportsShaders = true;
249 }
250#endif
251
252#ifdef BUILD_GL
253 if (!m_backend) {
254 glBackend = static_cast<mGLContext*>(malloc(sizeof(mGLContext)));
255 mGLContextCreate(glBackend);
256 m_backend = &glBackend->d;
257 m_supportsShaders = false;
258 }
259#endif
260 m_backend->swap = [](VideoBackend* v) {
261 PainterGL* painter = static_cast<PainterGL*>(v->user);
262 if (!painter->m_gl->isValid()) {
263 return;
264 }
265 painter->m_gl->swapBuffers(painter->m_gl->surface());
266 };
267
268 m_backend->init(m_backend, 0);
269#ifdef BUILD_GLES2
270 if (m_supportsShaders) {
271 m_shader.preprocessShader = static_cast<void*>(&reinterpret_cast<mGLES2Context*>(m_backend)->initialShader);
272 }
273#endif
274 m_gl->doneCurrent();
275
276 m_backend->user = this;
277 m_backend->filter = false;
278 m_backend->lockAspectRatio = false;
279
280 for (int i = 0; i < 2; ++i) {
281 m_free.append(new uint32_t[1024 * 2048]);
282 }
283}
284
285PainterGL::~PainterGL() {
286 while (!m_queue.isEmpty()) {
287 delete[] m_queue.dequeue();
288 }
289 for (auto item : m_free) {
290 delete[] item;
291 }
292 m_gl->makeCurrent(m_surface);
293#if defined(_WIN32) && defined(USE_EPOXY)
294 epoxy_handle_external_wglMakeCurrent();
295#endif
296#ifdef BUILD_GLES2
297 if (m_shader.passes) {
298 mGLES2ShaderFree(&m_shader);
299 }
300#endif
301 m_backend->deinit(m_backend);
302 m_gl->doneCurrent();
303 free(m_backend);
304 m_backend = nullptr;
305 delete m_window;
306}
307
308void PainterGL::setContext(std::shared_ptr<CoreController> context) {
309 m_context = context;
310 resizeContext();
311}
312
313void PainterGL::resizeContext() {
314 if (!m_context) {
315 return;
316 }
317
318 if (!m_active) {
319 m_gl->makeCurrent(m_surface);
320#if defined(_WIN32) && defined(USE_EPOXY)
321 epoxy_handle_external_wglMakeCurrent();
322#endif
323 }
324
325 QSize size = m_context->screenDimensions();
326 m_backend->setDimensions(m_backend, size.width(), size.height());
327 if (!m_active) {
328 m_gl->doneCurrent();
329 }
330}
331
332void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
333 m_messagePainter = messagePainter;
334}
335
336void PainterGL::resize(const QSize& size) {
337 m_size = size;
338 if (m_started && !m_active) {
339 forceDraw();
340 }
341}
342
343void PainterGL::lockAspectRatio(bool lock) {
344 m_backend->lockAspectRatio = lock;
345 resize(m_size);
346}
347
348void PainterGL::lockIntegerScaling(bool lock) {
349 m_backend->lockIntegerScaling = lock;
350 resize(m_size);
351}
352
353void PainterGL::filter(bool filter) {
354 m_backend->filter = filter;
355 if (m_started && !m_active) {
356 forceDraw();
357 }
358}
359
360void PainterGL::start() {
361 m_gl->makeCurrent(m_surface);
362#if defined(_WIN32) && defined(USE_EPOXY)
363 epoxy_handle_external_wglMakeCurrent();
364#endif
365
366#ifdef BUILD_GLES2
367 if (m_supportsShaders && m_shader.passes) {
368 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
369 }
370#endif
371
372 m_active = true;
373 m_started = true;
374}
375
376void PainterGL::draw() {
377 if (m_queue.isEmpty()) {
378 return;
379 }
380
381 if (mCoreSyncWaitFrameStart(&m_context->thread()->impl->sync) || !m_queue.isEmpty()) {
382 dequeue();
383 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
384 m_painter.begin(m_window);
385 performDraw();
386 m_painter.end();
387 m_backend->swap(m_backend);
388 if (!m_delayTimer.isValid()) {
389 m_delayTimer.start();
390 } else if (m_gl->format().swapInterval()) {
391 while (m_delayTimer.elapsed() < 15) {
392 QThread::usleep(100);
393 }
394 m_delayTimer.restart();
395 }
396 } else {
397 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
398 }
399 if (!m_queue.isEmpty()) {
400 QMetaObject::invokeMethod(this, "draw", Qt::QueuedConnection);
401 }
402}
403
404void PainterGL::forceDraw() {
405 m_painter.begin(m_window);
406 performDraw();
407 m_painter.end();
408 m_backend->swap(m_backend);
409}
410
411void PainterGL::stop() {
412 m_active = false;
413 m_started = false;
414 dequeueAll();
415 m_backend->clear(m_backend);
416 m_backend->swap(m_backend);
417 if (m_videoProxy) {
418 m_videoProxy->reset();
419 }
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