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
162void DisplayGL::resizeEvent(QResizeEvent* event) {
163 Display::resizeEvent(event);
164 resizePainter();
165}
166
167void DisplayGL::resizePainter() {
168 if (m_gl) {
169 m_gl->resize(size());
170 }
171 if (m_drawThread) {
172 QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, size()));
173 }
174}
175
176PainterGL::PainterGL(int majorVersion, QGLWidget* parent)
177 : m_gl(parent)
178{
179#ifdef BUILD_GL
180 mGLContext* glBackend;
181#endif
182#if !defined(_WIN32) || defined(USE_EPOXY)
183 mGLES2Context* gl2Backend;
184#endif
185
186#if !defined(_WIN32) || defined(USE_EPOXY)
187 if (majorVersion >= 2) {
188 gl2Backend = static_cast<mGLES2Context*>(malloc(sizeof(mGLES2Context)));
189 mGLES2ContextCreate(gl2Backend);
190 m_backend = &gl2Backend->d;
191 m_supportsShaders = true;
192 }
193#endif
194
195#ifdef BUILD_GL
196 if (!m_backend) {
197 glBackend = static_cast<mGLContext*>(malloc(sizeof(mGLContext)));
198 mGLContextCreate(glBackend);
199 m_backend = &glBackend->d;
200 m_supportsShaders = false;
201 }
202#endif
203 m_backend->swap = [](VideoBackend* v) {
204 PainterGL* painter = static_cast<PainterGL*>(v->user);
205 painter->m_gl->swapBuffers();
206 };
207
208 m_gl->makeCurrent();
209#if defined(_WIN32) && defined(USE_EPOXY)
210 epoxy_handle_external_wglMakeCurrent();
211#endif
212 m_backend->init(m_backend, reinterpret_cast<WHandle>(m_gl->winId()));
213#if !defined(_WIN32) || defined(USE_EPOXY)
214 if (m_supportsShaders) {
215 m_shader.preprocessShader = static_cast<void*>(&reinterpret_cast<mGLES2Context*>(m_backend)->initialShader);
216 }
217#endif
218 m_gl->doneCurrent();
219
220 m_backend->user = this;
221 m_backend->filter = false;
222 m_backend->lockAspectRatio = false;
223
224 for (int i = 0; i < 2; ++i) {
225 m_free.append(new uint32_t[256 * 256]);
226 }
227}
228
229PainterGL::~PainterGL() {
230 while (!m_queue.isEmpty()) {
231 delete[] m_queue.dequeue();
232 }
233 for (auto item : m_free) {
234 delete[] item;
235 }
236 m_gl->makeCurrent();
237#if defined(_WIN32) && defined(USE_EPOXY)
238 epoxy_handle_external_wglMakeCurrent();
239#endif
240#if !defined(_WIN32) || defined(USE_EPOXY)
241 if (m_shader.passes) {
242 mGLES2ShaderFree(&m_shader);
243 }
244#endif
245 m_backend->deinit(m_backend);
246 m_gl->doneCurrent();
247 free(m_backend);
248 m_backend = nullptr;
249}
250
251void PainterGL::setContext(std::shared_ptr<CoreController> context) {
252 m_context = context;
253
254 if (!context) {
255 return;
256 }
257
258 m_gl->makeCurrent();
259#if defined(_WIN32) && defined(USE_EPOXY)
260 epoxy_handle_external_wglMakeCurrent();
261#endif
262 QSize size = m_context->screenDimensions();
263 m_backend->setDimensions(m_backend, size.width(), size.height());
264 m_gl->doneCurrent();
265}
266
267void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
268 m_messagePainter = messagePainter;
269}
270
271void PainterGL::resize(const QSize& size) {
272 m_size = size;
273 if (m_started && !m_active) {
274 forceDraw();
275 }
276}
277
278void PainterGL::lockAspectRatio(bool lock) {
279 m_backend->lockAspectRatio = lock;
280 if (m_started && !m_active) {
281 forceDraw();
282 }
283}
284
285void PainterGL::lockIntegerScaling(bool lock) {
286 m_backend->lockIntegerScaling = lock;
287 if (m_started && !m_active) {
288 forceDraw();
289 }
290}
291
292void PainterGL::filter(bool filter) {
293 m_backend->filter = filter;
294 if (m_started && !m_active) {
295 forceDraw();
296 }
297}
298
299void PainterGL::start() {
300 m_gl->makeCurrent();
301#if defined(_WIN32) && defined(USE_EPOXY)
302 epoxy_handle_external_wglMakeCurrent();
303#endif
304
305#if !defined(_WIN32) || defined(USE_EPOXY)
306 if (m_supportsShaders && m_shader.passes) {
307 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
308 }
309#endif
310
311 m_gl->doneCurrent();
312 m_active = true;
313 m_started = true;
314}
315
316void PainterGL::draw() {
317 if (m_queue.isEmpty()) {
318 return;
319 }
320
321 if (mCoreSyncWaitFrameStart(&m_context->thread()->impl->sync) || !m_queue.isEmpty()) {
322 dequeue();
323 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
324 m_painter.begin(m_gl->context()->device());
325 performDraw();
326 m_painter.end();
327 m_backend->swap(m_backend);
328 if (!m_delayTimer.isValid()) {
329 m_delayTimer.start();
330 } else {
331 while (m_delayTimer.elapsed() < 15) {
332 QThread::usleep(100);
333 }
334 m_delayTimer.restart();
335 }
336 } else {
337 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
338 }
339 if (!m_queue.isEmpty()) {
340 QMetaObject::invokeMethod(this, "draw", Qt::QueuedConnection);
341 }
342}
343
344void PainterGL::forceDraw() {
345 m_painter.begin(m_gl->context()->device());
346 performDraw();
347 m_painter.end();
348 m_backend->swap(m_backend);
349}
350
351void PainterGL::stop() {
352 m_active = false;
353 m_started = false;
354 m_gl->makeCurrent();
355#if defined(_WIN32) && defined(USE_EPOXY)
356 epoxy_handle_external_wglMakeCurrent();
357#endif
358 dequeueAll();
359 m_backend->clear(m_backend);
360 m_backend->swap(m_backend);
361 m_gl->doneCurrent();
362 m_gl->context()->moveToThread(m_gl->thread());
363 m_context.reset();
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 QSize size = m_context->screenDimensions();
399 memcpy(buffer, backing, size.width() * size.height() * BYTES_PER_PIXEL);
400 m_queue.enqueue(buffer);
401 m_mutex.unlock();
402}
403
404void PainterGL::dequeue() {
405 m_mutex.lock();
406 if (m_queue.isEmpty()) {
407 m_mutex.unlock();
408 return;
409 }
410 uint32_t* buffer = m_queue.dequeue();
411 m_backend->postFrame(m_backend, buffer);
412 m_free.append(buffer);
413 m_mutex.unlock();
414}
415
416void PainterGL::dequeueAll() {
417 uint32_t* buffer = 0;
418 m_mutex.lock();
419 while (!m_queue.isEmpty()) {
420 buffer = m_queue.dequeue();
421 m_free.append(buffer);
422 }
423 if (buffer) {
424 m_backend->postFrame(m_backend, buffer);
425 }
426 m_mutex.unlock();
427}
428
429void PainterGL::setShaders(struct VDir* dir) {
430 if (!supportsShaders()) {
431 return;
432 }
433#if !defined(_WIN32) || defined(USE_EPOXY)
434 m_gl->makeCurrent();
435#if defined(_WIN32) && defined(USE_EPOXY)
436 epoxy_handle_external_wglMakeCurrent();
437#endif
438 if (m_shader.passes) {
439 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
440 mGLES2ShaderFree(&m_shader);
441 }
442 mGLES2ShaderLoad(&m_shader, dir);
443 if (m_started) {
444 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
445 }
446 m_gl->doneCurrent();
447#endif
448}
449
450void PainterGL::clearShaders() {
451 if (!supportsShaders()) {
452 return;
453 }
454#if !defined(_WIN32) || defined(USE_EPOXY)
455 m_gl->makeCurrent();
456#if defined(_WIN32) && defined(USE_EPOXY)
457 epoxy_handle_external_wglMakeCurrent();
458#endif
459 if (m_shader.passes) {
460 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
461 mGLES2ShaderFree(&m_shader);
462 }
463 m_gl->doneCurrent();
464#endif
465}
466
467VideoShader* PainterGL::shaders() {
468 return &m_shader;
469}
470
471#endif