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