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 <QResizeEvent>
14#include <QTimer>
15
16#include <mgba/core/core.h>
17#include <mgba-util/math.h>
18#ifdef BUILD_GL
19#include "platform/opengl/gl.h"
20#endif
21#if !defined(_WIN32) || defined(USE_EPOXY)
22#include "platform/opengl/gles2.h"
23#ifdef _WIN32
24#include <epoxy/wgl.h>
25#endif
26#endif
27
28using namespace QGBA;
29
30DisplayGL::DisplayGL(const QGLFormat& format, QWidget* parent)
31 : Display(parent)
32 , m_gl(nullptr)
33{
34 // This can spontaneously re-enter into this->resizeEvent before creation is done, so we
35 // need to make sure it's initialized to nullptr before we assign the new object to it
36 m_gl = new EmptyGLWidget(format, this);
37 m_painter = new PainterGL(format.majorVersion() < 2 ? 1 : m_gl->format().majorVersion(), m_gl);
38 m_gl->setMouseTracking(true);
39 m_gl->setAttribute(Qt::WA_TransparentForMouseEvents); // This doesn't seem to work?
40}
41
42DisplayGL::~DisplayGL() {
43 delete m_painter;
44}
45
46bool DisplayGL::supportsShaders() const {
47 return m_painter->supportsShaders();
48}
49
50VideoShader* DisplayGL::shaders() {
51 VideoShader* shaders = nullptr;
52 if (m_drawThread) {
53 QMetaObject::invokeMethod(m_painter, "shaders", Qt::BlockingQueuedConnection, Q_RETURN_ARG(VideoShader*, shaders));
54 } else {
55 shaders = m_painter->shaders();
56 }
57 return shaders;
58}
59
60void DisplayGL::startDrawing(std::shared_ptr<CoreController> controller) {
61 if (m_drawThread) {
62 return;
63 }
64 m_isDrawing = true;
65 m_painter->setContext(controller);
66 m_painter->setMessagePainter(messagePainter());
67 m_context = controller;
68 m_painter->resize(size());
69 m_gl->move(0, 0);
70 m_drawThread = new QThread(this);
71 m_drawThread->setObjectName("Painter Thread");
72 m_gl->context()->doneCurrent();
73 m_gl->context()->moveToThread(m_drawThread);
74 m_painter->moveToThread(m_drawThread);
75 connect(m_drawThread, &QThread::started, m_painter, &PainterGL::start);
76 m_drawThread->start();
77
78 lockAspectRatio(isAspectRatioLocked());
79 lockIntegerScaling(isIntegerScalingLocked());
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 CoreController::Interrupter interrupter(m_context);
93 QMetaObject::invokeMethod(m_painter, "stop", Qt::BlockingQueuedConnection);
94 m_drawThread->exit();
95 m_drawThread = nullptr;
96 }
97 m_context.reset();
98}
99
100void DisplayGL::pauseDrawing() {
101 if (m_drawThread) {
102 m_isDrawing = false;
103 CoreController::Interrupter interrupter(m_context);
104 QMetaObject::invokeMethod(m_painter, "pause", Qt::BlockingQueuedConnection);
105 }
106}
107
108void DisplayGL::unpauseDrawing() {
109 if (m_drawThread) {
110 m_isDrawing = true;
111 CoreController::Interrupter interrupter(m_context);
112 QMetaObject::invokeMethod(m_painter, "unpause", Qt::BlockingQueuedConnection);
113 }
114}
115
116void DisplayGL::forceDraw() {
117 if (m_drawThread) {
118 QMetaObject::invokeMethod(m_painter, "forceDraw");
119 }
120}
121
122void DisplayGL::lockAspectRatio(bool lock) {
123 Display::lockAspectRatio(lock);
124 if (m_drawThread) {
125 QMetaObject::invokeMethod(m_painter, "lockAspectRatio", Q_ARG(bool, lock));
126 }
127}
128
129void DisplayGL::lockIntegerScaling(bool lock) {
130 Display::lockIntegerScaling(lock);
131 if (m_drawThread) {
132 QMetaObject::invokeMethod(m_painter, "lockIntegerScaling", Q_ARG(bool, lock));
133 }
134}
135
136void DisplayGL::filter(bool filter) {
137 Display::filter(filter);
138 if (m_drawThread) {
139 QMetaObject::invokeMethod(m_painter, "filter", Q_ARG(bool, filter));
140 }
141}
142
143void DisplayGL::framePosted() {
144 if (m_drawThread) {
145 m_painter->enqueue(m_context->drawContext());
146 QMetaObject::invokeMethod(m_painter, "draw");
147 }
148}
149
150void DisplayGL::setShaders(struct VDir* shaders) {
151 if (m_drawThread) {
152 QMetaObject::invokeMethod(m_painter, "setShaders", Qt::BlockingQueuedConnection, Q_ARG(struct VDir*, shaders));
153 } else {
154 m_painter->setShaders(shaders);
155 }
156}
157
158void DisplayGL::clearShaders() {
159 QMetaObject::invokeMethod(m_painter, "clearShaders");
160}
161
162
163void DisplayGL::resizeContext() {
164 if (m_drawThread) {
165 m_isDrawing = false;
166 CoreController::Interrupter interrupter(m_context);
167 QMetaObject::invokeMethod(m_painter, "resizeContext", Qt::BlockingQueuedConnection);
168 }
169}
170
171void DisplayGL::resizeEvent(QResizeEvent* event) {
172 Display::resizeEvent(event);
173 resizePainter();
174}
175
176void DisplayGL::resizePainter() {
177 if (m_gl) {
178 m_gl->resize(size());
179 }
180 if (m_drawThread) {
181 QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, size()));
182 }
183}
184
185PainterGL::PainterGL(int majorVersion, QGLWidget* parent)
186 : m_gl(parent)
187{
188#ifdef BUILD_GL
189 mGLContext* glBackend;
190#endif
191#if !defined(_WIN32) || defined(USE_EPOXY)
192 mGLES2Context* gl2Backend;
193#endif
194
195#if !defined(_WIN32) || defined(USE_EPOXY)
196 if (majorVersion >= 2) {
197 gl2Backend = static_cast<mGLES2Context*>(malloc(sizeof(mGLES2Context)));
198 mGLES2ContextCreate(gl2Backend);
199 m_backend = &gl2Backend->d;
200 m_supportsShaders = true;
201 }
202#endif
203
204#ifdef BUILD_GL
205 if (!m_backend) {
206 glBackend = static_cast<mGLContext*>(malloc(sizeof(mGLContext)));
207 mGLContextCreate(glBackend);
208 m_backend = &glBackend->d;
209 m_supportsShaders = false;
210 }
211#endif
212 m_backend->swap = [](VideoBackend* v) {
213 PainterGL* painter = static_cast<PainterGL*>(v->user);
214 painter->m_gl->swapBuffers();
215 };
216
217 m_gl->makeCurrent();
218#if defined(_WIN32) && defined(USE_EPOXY)
219 epoxy_handle_external_wglMakeCurrent();
220#endif
221 m_backend->init(m_backend, reinterpret_cast<WHandle>(m_gl->winId()));
222#if !defined(_WIN32) || defined(USE_EPOXY)
223 if (m_supportsShaders) {
224 m_shader.preprocessShader = static_cast<void*>(&reinterpret_cast<mGLES2Context*>(m_backend)->initialShader);
225 }
226#endif
227 m_gl->doneCurrent();
228
229 m_backend->user = this;
230 m_backend->filter = false;
231 m_backend->lockAspectRatio = false;
232
233 for (int i = 0; i < 2; ++i) {
234 m_free.append(new uint32_t[256 * 256]);
235 }
236}
237
238PainterGL::~PainterGL() {
239 while (!m_queue.isEmpty()) {
240 delete[] m_queue.dequeue();
241 }
242 for (auto item : m_free) {
243 delete[] item;
244 }
245 m_gl->makeCurrent();
246#if defined(_WIN32) && defined(USE_EPOXY)
247 epoxy_handle_external_wglMakeCurrent();
248#endif
249#if !defined(_WIN32) || defined(USE_EPOXY)
250 if (m_shader.passes) {
251 mGLES2ShaderFree(&m_shader);
252 }
253#endif
254 m_backend->deinit(m_backend);
255 m_gl->doneCurrent();
256 free(m_backend);
257 m_backend = nullptr;
258}
259
260void PainterGL::setContext(std::shared_ptr<CoreController> context) {
261 m_context = context;
262 resizeContext();
263}
264
265void PainterGL::resizeContext() {
266 if (!m_context) {
267 return;
268 }
269
270 m_gl->makeCurrent();
271#if defined(_WIN32) && defined(USE_EPOXY)
272 epoxy_handle_external_wglMakeCurrent();
273#endif
274 QSize size = m_context->screenDimensions();
275 m_backend->setDimensions(m_backend, size.width(), size.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::lockIntegerScaling(bool lock) {
298 m_backend->lockIntegerScaling = lock;
299 if (m_started && !m_active) {
300 forceDraw();
301 }
302}
303
304void PainterGL::filter(bool filter) {
305 m_backend->filter = filter;
306 if (m_started && !m_active) {
307 forceDraw();
308 }
309}
310
311void PainterGL::start() {
312 m_gl->makeCurrent();
313#if defined(_WIN32) && defined(USE_EPOXY)
314 epoxy_handle_external_wglMakeCurrent();
315#endif
316
317#if !defined(_WIN32) || defined(USE_EPOXY)
318 if (m_supportsShaders && m_shader.passes) {
319 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
320 }
321#endif
322
323 m_gl->doneCurrent();
324 m_active = true;
325 m_started = true;
326}
327
328void PainterGL::draw() {
329 if (m_queue.isEmpty()) {
330 return;
331 }
332
333 if (mCoreSyncWaitFrameStart(&m_context->thread()->impl->sync) || !m_queue.isEmpty()) {
334 dequeue();
335 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
336 m_painter.begin(m_gl->context()->device());
337 performDraw();
338 m_painter.end();
339 m_backend->swap(m_backend);
340 if (!m_delayTimer.isValid()) {
341 m_delayTimer.start();
342 } else {
343 while (m_delayTimer.elapsed() < 15) {
344 QThread::usleep(100);
345 }
346 m_delayTimer.restart();
347 }
348 } else {
349 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
350 }
351 if (!m_queue.isEmpty()) {
352 QMetaObject::invokeMethod(this, "draw", Qt::QueuedConnection);
353 }
354}
355
356void PainterGL::forceDraw() {
357 m_painter.begin(m_gl->context()->device());
358 performDraw();
359 m_painter.end();
360 m_backend->swap(m_backend);
361}
362
363void PainterGL::stop() {
364 m_active = false;
365 m_started = false;
366 m_gl->makeCurrent();
367#if defined(_WIN32) && defined(USE_EPOXY)
368 epoxy_handle_external_wglMakeCurrent();
369#endif
370 dequeueAll();
371 m_backend->clear(m_backend);
372 m_backend->swap(m_backend);
373 m_gl->doneCurrent();
374 m_gl->context()->moveToThread(m_gl->thread());
375 m_context.reset();
376 moveToThread(m_gl->thread());
377}
378
379void PainterGL::pause() {
380 m_active = false;
381}
382
383void PainterGL::unpause() {
384 m_active = true;
385}
386
387void PainterGL::performDraw() {
388 m_painter.beginNativePainting();
389#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
390 float r = m_gl->devicePixelRatioF();
391#else
392 float r = m_gl->devicePixelRatio();
393#endif
394 m_backend->resized(m_backend, m_size.width() * r, m_size.height() * r);
395 m_backend->drawFrame(m_backend);
396 m_painter.endNativePainting();
397 if (m_messagePainter) {
398 m_messagePainter->paint(&m_painter);
399 }
400}
401
402void PainterGL::enqueue(const uint32_t* backing) {
403 m_mutex.lock();
404 uint32_t* buffer;
405 if (m_free.isEmpty()) {
406 buffer = m_queue.dequeue();
407 } else {
408 buffer = m_free.takeLast();
409 }
410 QSize size = m_context->screenDimensions();
411 memcpy(buffer, backing, size.width() * size.height() * BYTES_PER_PIXEL);
412 m_queue.enqueue(buffer);
413 m_mutex.unlock();
414}
415
416void PainterGL::dequeue() {
417 m_mutex.lock();
418 if (m_queue.isEmpty()) {
419 m_mutex.unlock();
420 return;
421 }
422 uint32_t* buffer = m_queue.dequeue();
423 m_backend->postFrame(m_backend, buffer);
424 m_free.append(buffer);
425 m_mutex.unlock();
426}
427
428void PainterGL::dequeueAll() {
429 uint32_t* buffer = 0;
430 m_mutex.lock();
431 while (!m_queue.isEmpty()) {
432 buffer = m_queue.dequeue();
433 m_free.append(buffer);
434 }
435 if (buffer) {
436 m_backend->postFrame(m_backend, buffer);
437 }
438 m_mutex.unlock();
439}
440
441void PainterGL::setShaders(struct VDir* dir) {
442 if (!supportsShaders()) {
443 return;
444 }
445#if !defined(_WIN32) || defined(USE_EPOXY)
446 m_gl->makeCurrent();
447#if defined(_WIN32) && defined(USE_EPOXY)
448 epoxy_handle_external_wglMakeCurrent();
449#endif
450 if (m_shader.passes) {
451 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
452 mGLES2ShaderFree(&m_shader);
453 }
454 mGLES2ShaderLoad(&m_shader, dir);
455 if (m_started) {
456 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
457 }
458 m_gl->doneCurrent();
459#endif
460}
461
462void PainterGL::clearShaders() {
463 if (!supportsShaders()) {
464 return;
465 }
466#if !defined(_WIN32) || defined(USE_EPOXY)
467 m_gl->makeCurrent();
468#if defined(_WIN32) && defined(USE_EPOXY)
469 epoxy_handle_external_wglMakeCurrent();
470#endif
471 if (m_shader.passes) {
472 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
473 mGLES2ShaderFree(&m_shader);
474 }
475 m_gl->doneCurrent();
476#endif
477}
478
479VideoShader* PainterGL::shaders() {
480 return &m_shader;
481}
482
483#endif