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#include <QApplication>
9#include <QResizeEvent>
10#include <QTimer>
11
12#include <mgba/core/core.h>
13#include <mgba/core/thread.h>
14#ifdef BUILD_GL
15#include "platform/opengl/gl.h"
16#endif
17#if !defined(_WIN32) || defined(USE_EPOXY)
18#include "platform/opengl/gles2.h"
19#ifdef _WIN32
20#include <epoxy/wgl.h>
21#endif
22#endif
23
24using namespace QGBA;
25
26DisplayGL::DisplayGL(const QGLFormat& format, QWidget* parent)
27 : Display(parent)
28 , m_isDrawing(false)
29 , m_gl(new EmptyGLWidget(format, this))
30 , m_drawThread(nullptr)
31 , m_context(nullptr)
32{
33 m_painter = new PainterGL(format.majorVersion() < 2 ? 1 : m_gl->format().majorVersion(), m_gl);
34 m_gl->setMouseTracking(true);
35 m_gl->setAttribute(Qt::WA_TransparentForMouseEvents); // This doesn't seem to work?
36}
37
38DisplayGL::~DisplayGL() {
39 delete m_painter;
40}
41
42bool DisplayGL::supportsShaders() const {
43 return m_painter->supportsShaders();
44}
45
46VideoShader* DisplayGL::shaders() {
47 VideoShader* shaders = nullptr;
48 if (m_drawThread) {
49 QMetaObject::invokeMethod(m_painter, "shaders", Qt::BlockingQueuedConnection, Q_RETURN_ARG(VideoShader*, shaders));
50 } else {
51 shaders = m_painter->shaders();
52 }
53 return shaders;
54}
55
56void DisplayGL::startDrawing(mCoreThread* thread) {
57 if (m_drawThread) {
58 return;
59 }
60 m_isDrawing = true;
61 m_painter->setContext(thread);
62 m_painter->setMessagePainter(messagePainter());
63 m_context = thread;
64 m_painter->resize(size());
65 m_gl->move(0, 0);
66 m_drawThread = new QThread(this);
67 m_drawThread->setObjectName("Painter Thread");
68 m_gl->context()->doneCurrent();
69 m_gl->context()->moveToThread(m_drawThread);
70 m_painter->moveToThread(m_drawThread);
71 connect(m_drawThread, SIGNAL(started()), m_painter, SLOT(start()));
72 m_drawThread->start();
73 mCoreSyncSetVideoSync(&m_context->sync, false);
74
75 lockAspectRatio(isAspectRatioLocked());
76 unsigned width, height;
77 thread->core->desiredVideoDimensions(thread->core, &width, &height);
78 setSystemDimensions(width, height);
79
80 filter(isFiltered());
81#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
82 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatioF());
83#else
84 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatio());
85#endif
86 resizePainter();
87}
88
89void DisplayGL::stopDrawing() {
90 if (m_drawThread) {
91 m_isDrawing = false;
92 if (mCoreThreadIsActive(m_context)) {
93 mCoreThreadInterrupt(m_context);
94 }
95 QMetaObject::invokeMethod(m_painter, "stop", Qt::BlockingQueuedConnection);
96 m_drawThread->exit();
97 m_drawThread = nullptr;
98 if (mCoreThreadIsActive(m_context)) {
99 mCoreThreadContinue(m_context);
100 }
101 }
102}
103
104void DisplayGL::pauseDrawing() {
105 if (m_drawThread) {
106 m_isDrawing = false;
107 if (mCoreThreadIsActive(m_context)) {
108 mCoreThreadInterrupt(m_context);
109 }
110 QMetaObject::invokeMethod(m_painter, "pause", Qt::BlockingQueuedConnection);
111 if (mCoreThreadIsActive(m_context)) {
112 mCoreThreadContinue(m_context);
113 }
114 }
115}
116
117void DisplayGL::unpauseDrawing() {
118 if (m_drawThread) {
119 m_isDrawing = true;
120 if (mCoreThreadIsActive(m_context)) {
121 mCoreThreadInterrupt(m_context);
122 }
123 QMetaObject::invokeMethod(m_painter, "unpause", Qt::BlockingQueuedConnection);
124 if (mCoreThreadIsActive(m_context)) {
125 mCoreThreadContinue(m_context);
126 }
127 }
128}
129
130void DisplayGL::forceDraw() {
131 if (m_drawThread) {
132 QMetaObject::invokeMethod(m_painter, "forceDraw");
133 }
134}
135
136void DisplayGL::lockAspectRatio(bool lock) {
137 Display::lockAspectRatio(lock);
138 if (m_drawThread) {
139 QMetaObject::invokeMethod(m_painter, "lockAspectRatio", Q_ARG(bool, lock));
140 }
141}
142
143void DisplayGL::filter(bool filter) {
144 Display::filter(filter);
145 if (m_drawThread) {
146 QMetaObject::invokeMethod(m_painter, "filter", Q_ARG(bool, filter));
147 }
148}
149
150void DisplayGL::framePosted(const uint32_t* buffer) {
151 if (m_drawThread && buffer) {
152 m_painter->enqueue(buffer);
153 QMetaObject::invokeMethod(m_painter, "draw");
154 }
155}
156
157void DisplayGL::setShaders(struct VDir* shaders) {
158 if (m_drawThread) {
159 QMetaObject::invokeMethod(m_painter, "setShaders", Qt::BlockingQueuedConnection, Q_ARG(struct VDir*, shaders));
160 } else {
161 m_painter->setShaders(shaders);
162 }
163}
164
165void DisplayGL::clearShaders() {
166 QMetaObject::invokeMethod(m_painter, "clearShaders");
167}
168
169void DisplayGL::resizeEvent(QResizeEvent* event) {
170 Display::resizeEvent(event);
171 resizePainter();
172}
173
174void DisplayGL::resizePainter() {
175 m_gl->resize(size());
176 if (m_drawThread) {
177 QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, size()));
178 }
179}
180
181PainterGL::PainterGL(int majorVersion, QGLWidget* parent)
182 : m_gl(parent)
183 , m_active(false)
184 , m_started(false)
185 , m_context(nullptr)
186 , m_shader{}
187 , m_backend(nullptr)
188 , m_messagePainter(nullptr)
189{
190#ifdef BUILD_GL
191 mGLContext* glBackend;
192#endif
193#if !defined(_WIN32) || defined(USE_EPOXY)
194 mGLES2Context* gl2Backend;
195#endif
196
197#if !defined(_WIN32) || defined(USE_EPOXY)
198 if (majorVersion >= 2) {
199 gl2Backend = new mGLES2Context;
200 mGLES2ContextCreate(gl2Backend);
201 m_backend = &gl2Backend->d;
202 m_supportsShaders = true;
203 }
204#endif
205
206#ifdef BUILD_GL
207 if (!m_backend) {
208 glBackend = new mGLContext;
209 mGLContextCreate(glBackend);
210 m_backend = &glBackend->d;
211 m_supportsShaders = false;
212 }
213#endif
214 m_backend->swap = [](VideoBackend* v) {
215 PainterGL* painter = static_cast<PainterGL*>(v->user);
216 painter->m_gl->swapBuffers();
217 };
218
219 m_gl->makeCurrent();
220#if defined(_WIN32) && defined(USE_EPOXY)
221 epoxy_handle_external_wglMakeCurrent();
222#endif
223 m_backend->init(m_backend, reinterpret_cast<WHandle>(m_gl->winId()));
224#if !defined(_WIN32) || defined(USE_EPOXY)
225 if (m_supportsShaders) {
226 m_shader.preprocessShader = static_cast<void*>(&reinterpret_cast<mGLES2Context*>(m_backend)->initialShader);
227 }
228#endif
229 m_gl->doneCurrent();
230
231 m_backend->user = this;
232 m_backend->filter = false;
233 m_backend->lockAspectRatio = false;
234
235 for (int i = 0; i < 2; ++i) {
236 m_free.append(new uint32_t[256 * 384]);
237 }
238}
239
240PainterGL::~PainterGL() {
241 while (!m_queue.isEmpty()) {
242 delete[] m_queue.dequeue();
243 }
244 for (auto item : m_free) {
245 delete[] item;
246 }
247 m_gl->makeCurrent();
248#if defined(_WIN32) && defined(USE_EPOXY)
249 epoxy_handle_external_wglMakeCurrent();
250#endif
251#if !defined(_WIN32) || defined(USE_EPOXY)
252 if (m_shader.passes) {
253 mGLES2ShaderFree(&m_shader);
254 }
255#endif
256 m_backend->deinit(m_backend);
257 m_gl->doneCurrent();
258 delete m_backend;
259 m_backend = nullptr;
260}
261
262void PainterGL::setContext(mCoreThread* context) {
263 m_context = context;
264
265 if (!context) {
266 return;
267 }
268
269 m_gl->makeCurrent();
270#if defined(_WIN32) && defined(USE_EPOXY)
271 epoxy_handle_external_wglMakeCurrent();
272#endif
273 unsigned width, height;
274 context->core->desiredVideoDimensions(context->core, &width, &height);
275 m_backend->setDimensions(m_backend, width, height);
276 m_gl->doneCurrent();
277}
278
279void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
280 m_messagePainter = messagePainter;
281}
282
283void PainterGL::resize(const QSize& size) {
284 m_size = size;
285 if (m_started && !m_active) {
286 forceDraw();
287 }
288}
289
290void PainterGL::lockAspectRatio(bool lock) {
291 m_backend->lockAspectRatio = lock;
292 if (m_started && !m_active) {
293 forceDraw();
294 }
295}
296
297void PainterGL::filter(bool filter) {
298 m_backend->filter = filter;
299 if (m_started && !m_active) {
300 forceDraw();
301 }
302}
303
304void PainterGL::start() {
305 m_gl->makeCurrent();
306#if defined(_WIN32) && defined(USE_EPOXY)
307 epoxy_handle_external_wglMakeCurrent();
308#endif
309
310#if !defined(_WIN32) || defined(USE_EPOXY)
311 if (m_supportsShaders && m_shader.passes) {
312 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
313 }
314#endif
315
316 m_gl->doneCurrent();
317 m_active = true;
318 m_started = true;
319}
320
321void PainterGL::draw() {
322 if (m_queue.isEmpty() || !mCoreThreadIsActive(m_context)) {
323 return;
324 }
325
326 if (mCoreSyncWaitFrameStart(&m_context->sync) || !m_queue.isEmpty()) {
327 dequeue();
328 mCoreSyncWaitFrameEnd(&m_context->sync);
329 m_painter.begin(m_gl->context()->device());
330 performDraw();
331 m_painter.end();
332 m_backend->swap(m_backend);
333 if (!m_delayTimer.isValid()) {
334 m_delayTimer.start();
335 } else {
336 while (m_delayTimer.elapsed() < 15) {
337 QThread::usleep(100);
338 }
339 m_delayTimer.restart();
340 }
341 } else {
342 mCoreSyncWaitFrameEnd(&m_context->sync);
343 }
344 if (!m_queue.isEmpty()) {
345 QMetaObject::invokeMethod(this, "draw", Qt::QueuedConnection);
346 }
347}
348
349void PainterGL::forceDraw() {
350 m_painter.begin(m_gl->context()->device());
351 performDraw();
352 m_painter.end();
353 m_backend->swap(m_backend);
354}
355
356void PainterGL::stop() {
357 m_active = false;
358 m_started = false;
359 m_gl->makeCurrent();
360#if defined(_WIN32) && defined(USE_EPOXY)
361 epoxy_handle_external_wglMakeCurrent();
362#endif
363 dequeueAll();
364 m_backend->clear(m_backend);
365 m_backend->swap(m_backend);
366 m_gl->doneCurrent();
367 m_gl->context()->moveToThread(m_gl->thread());
368 moveToThread(m_gl->thread());
369}
370
371void PainterGL::pause() {
372 m_active = false;
373}
374
375void PainterGL::unpause() {
376 m_active = true;
377}
378
379void PainterGL::performDraw() {
380 m_painter.beginNativePainting();
381#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
382 float r = m_gl->devicePixelRatioF();
383#else
384 float r = m_gl->devicePixelRatio();
385#endif
386 m_backend->resized(m_backend, m_size.width() * r, m_size.height() * r);
387 m_backend->drawFrame(m_backend);
388 m_painter.endNativePainting();
389 if (m_messagePainter) {
390 m_messagePainter->paint(&m_painter);
391 }
392}
393
394void PainterGL::enqueue(const uint32_t* backing) {
395 m_mutex.lock();
396 uint32_t* buffer;
397 if (m_free.isEmpty()) {
398 buffer = m_queue.dequeue();
399 } else {
400 buffer = m_free.takeLast();
401 }
402 unsigned width, height;
403 m_context->core->desiredVideoDimensions(m_context->core, &width, &height);
404 memcpy(buffer, backing, width * height * BYTES_PER_PIXEL);
405 m_queue.enqueue(buffer);
406 m_mutex.unlock();
407}
408
409void PainterGL::dequeue() {
410 m_mutex.lock();
411 if (m_queue.isEmpty()) {
412 m_mutex.unlock();
413 return;
414 }
415 uint32_t* buffer = m_queue.dequeue();
416 m_backend->postFrame(m_backend, buffer);
417 m_free.append(buffer);
418 m_mutex.unlock();
419}
420
421void PainterGL::dequeueAll() {
422 uint32_t* buffer = 0;
423 m_mutex.lock();
424 while (!m_queue.isEmpty()) {
425 buffer = m_queue.dequeue();
426 m_free.append(buffer);
427 }
428 if (buffer) {
429 m_backend->postFrame(m_backend, buffer);
430 }
431 m_mutex.unlock();
432}
433
434void PainterGL::setShaders(struct VDir* dir) {
435 if (!supportsShaders()) {
436 return;
437 }
438#if !defined(_WIN32) || defined(USE_EPOXY)
439 m_gl->makeCurrent();
440#if defined(_WIN32) && defined(USE_EPOXY)
441 epoxy_handle_external_wglMakeCurrent();
442#endif
443 if (m_shader.passes) {
444 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
445 mGLES2ShaderFree(&m_shader);
446 }
447 mGLES2ShaderLoad(&m_shader, dir);
448 if (m_started) {
449 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
450 }
451 m_gl->doneCurrent();
452#endif
453}
454
455void PainterGL::clearShaders() {
456 if (!supportsShaders()) {
457 return;
458 }
459#if !defined(_WIN32) || defined(USE_EPOXY)
460 m_gl->makeCurrent();
461#if defined(_WIN32) && defined(USE_EPOXY)
462 epoxy_handle_external_wglMakeCurrent();
463#endif
464 if (m_shader.passes) {
465 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
466 mGLES2ShaderFree(&m_shader);
467 }
468 m_gl->doneCurrent();
469#endif
470}
471
472VideoShader* PainterGL::shaders() {
473 return &m_shader;
474}