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->doneCurrent();
268 painter->m_gl->swapBuffers(painter->m_surface);
269 painter->m_gl->makeCurrent(painter->m_surface);
270#if defined(_WIN32) && defined(USE_EPOXY)
271 epoxy_handle_external_wglMakeCurrent();
272#endif
273 };
274
275 m_backend->init(m_backend, 0);
276#ifdef BUILD_GLES2
277 if (m_supportsShaders) {
278 m_shader.preprocessShader = static_cast<void*>(&reinterpret_cast<mGLES2Context*>(m_backend)->initialShader);
279 }
280#endif
281 m_gl->doneCurrent();
282
283 m_backend->user = this;
284 m_backend->filter = false;
285 m_backend->lockAspectRatio = false;
286
287 for (int i = 0; i < 2; ++i) {
288 m_free.append(new uint32_t[1024 * 2048]);
289 }
290}
291
292PainterGL::~PainterGL() {
293 while (!m_queue.isEmpty()) {
294 delete[] m_queue.dequeue();
295 }
296 for (auto item : m_free) {
297 delete[] item;
298 }
299 m_gl->makeCurrent(m_surface);
300#if defined(_WIN32) && defined(USE_EPOXY)
301 epoxy_handle_external_wglMakeCurrent();
302#endif
303#ifdef BUILD_GLES2
304 if (m_shader.passes) {
305 mGLES2ShaderFree(&m_shader);
306 }
307#endif
308 m_backend->deinit(m_backend);
309 m_gl->doneCurrent();
310 free(m_backend);
311 m_backend = nullptr;
312 delete m_window;
313}
314
315void PainterGL::setContext(std::shared_ptr<CoreController> context) {
316 m_context = context;
317 resizeContext();
318}
319
320void PainterGL::resizeContext() {
321 if (!m_context) {
322 return;
323 }
324
325 QSize size = m_context->screenDimensions();
326 m_backend->setDimensions(m_backend, size.width(), size.height());
327}
328
329void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
330 m_messagePainter = messagePainter;
331}
332
333void PainterGL::resize(const QSize& size) {
334 m_size = size;
335 if (m_started && !m_active) {
336 forceDraw();
337 }
338}
339
340void PainterGL::lockAspectRatio(bool lock) {
341 m_backend->lockAspectRatio = lock;
342 resize(m_size);
343}
344
345void PainterGL::lockIntegerScaling(bool lock) {
346 m_backend->lockIntegerScaling = lock;
347 resize(m_size);
348}
349
350void PainterGL::filter(bool filter) {
351 m_backend->filter = filter;
352 if (m_started && !m_active) {
353 forceDraw();
354 }
355}
356
357void PainterGL::start() {
358 m_gl->makeCurrent(m_surface);
359#if defined(_WIN32) && defined(USE_EPOXY)
360 epoxy_handle_external_wglMakeCurrent();
361#endif
362
363#ifdef BUILD_GLES2
364 if (m_supportsShaders && m_shader.passes) {
365 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
366 }
367#endif
368
369 m_active = true;
370 m_started = true;
371}
372
373void PainterGL::draw() {
374 if (m_queue.isEmpty()) {
375 return;
376 }
377
378 if (mCoreSyncWaitFrameStart(&m_context->thread()->impl->sync) || !m_queue.isEmpty()) {
379 dequeue();
380 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
381 m_painter.begin(m_window);
382 performDraw();
383 m_painter.end();
384 m_backend->swap(m_backend);
385 if (!m_delayTimer.isValid()) {
386 m_delayTimer.start();
387 } else if (m_gl->format().swapInterval() && m_context->videoSync()) {
388 while (m_delayTimer.elapsed() < 15) {
389 QThread::usleep(100);
390 }
391 m_delayTimer.restart();
392 }
393 } else {
394 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
395 }
396 if (!m_queue.isEmpty()) {
397 QMetaObject::invokeMethod(this, "draw", Qt::QueuedConnection);
398 }
399}
400
401void PainterGL::forceDraw() {
402 m_painter.begin(m_window);
403 performDraw();
404 m_painter.end();
405 m_backend->swap(m_backend);
406}
407
408void PainterGL::stop() {
409 m_active = false;
410 m_started = false;
411 dequeueAll();
412 m_backend->clear(m_backend);
413 m_backend->swap(m_backend);
414 if (m_videoProxy) {
415 m_videoProxy->reset();
416 }
417 m_gl->doneCurrent();
418 m_gl->moveToThread(m_surface->thread());
419 m_context.reset();
420 moveToThread(m_gl->thread());
421 m_videoProxy->moveToThread(m_gl->thread());
422}
423
424void PainterGL::pause() {
425 m_active = false;
426}
427
428void PainterGL::unpause() {
429 m_active = true;
430}
431
432void PainterGL::performDraw() {
433 m_painter.beginNativePainting();
434 float r = m_surface->devicePixelRatio();
435 m_backend->resized(m_backend, m_size.width() * r, m_size.height() * r);
436 m_backend->drawFrame(m_backend);
437 m_painter.endNativePainting();
438 if (m_messagePainter) {
439 m_messagePainter->paint(&m_painter);
440 }
441}
442
443void PainterGL::enqueue(const uint32_t* backing) {
444 m_mutex.lock();
445 uint32_t* buffer = nullptr;
446 if (backing) {
447 if (m_free.isEmpty()) {
448 buffer = m_queue.dequeue();
449 } else {
450 buffer = m_free.takeLast();
451 }
452 QSize size = m_context->screenDimensions();
453 memcpy(buffer, backing, size.width() * size.height() * BYTES_PER_PIXEL);
454 }
455 m_queue.enqueue(buffer);
456 m_mutex.unlock();
457}
458
459void PainterGL::dequeue() {
460 m_mutex.lock();
461 if (m_queue.isEmpty()) {
462 m_mutex.unlock();
463 return;
464 }
465 uint32_t* buffer = m_queue.dequeue();
466 if (buffer) {
467 m_backend->postFrame(m_backend, buffer);
468 m_free.append(buffer);
469 }
470 m_mutex.unlock();
471}
472
473void PainterGL::dequeueAll() {
474 uint32_t* buffer = 0;
475 m_mutex.lock();
476 while (!m_queue.isEmpty()) {
477 buffer = m_queue.dequeue();
478 if (buffer) {
479 m_free.append(buffer);
480 }
481 }
482 if (buffer) {
483 m_backend->postFrame(m_backend, buffer);
484 }
485 m_mutex.unlock();
486}
487
488void PainterGL::setShaders(struct VDir* dir) {
489 if (!supportsShaders()) {
490 return;
491 }
492#ifdef BUILD_GLES2
493 if (m_shader.passes) {
494 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
495 mGLES2ShaderFree(&m_shader);
496 }
497 mGLES2ShaderLoad(&m_shader, dir);
498 if (m_started) {
499 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
500 }
501#endif
502}
503
504void PainterGL::clearShaders() {
505 if (!supportsShaders()) {
506 return;
507 }
508#ifdef BUILD_GLES2
509 if (m_shader.passes) {
510 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
511 mGLES2ShaderFree(&m_shader);
512 }
513#endif
514}
515
516VideoShader* PainterGL::shaders() {
517 return &m_shader;
518}
519
520int PainterGL::glTex() {
521#ifdef BUILD_GLES2
522 if (supportsShaders()) {
523 mGLES2Context* gl2Backend = reinterpret_cast<mGLES2Context*>(m_backend);
524 return gl2Backend->tex;
525 }
526#endif
527#ifdef BUILD_GL
528 mGLContext* glBackend = reinterpret_cast<mGLContext*>(m_backend);
529 return glBackend->tex;
530#else
531 return -1;
532#endif
533}
534
535#endif