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