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