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 stopDrawing();
44 delete m_painter;
45}
46
47bool DisplayGL::supportsShaders() const {
48 return m_painter->supportsShaders();
49}
50
51VideoShader* DisplayGL::shaders() {
52 VideoShader* shaders = nullptr;
53 if (m_drawThread) {
54 QMetaObject::invokeMethod(m_painter, "shaders", Qt::BlockingQueuedConnection, Q_RETURN_ARG(VideoShader*, shaders));
55 } else {
56 shaders = m_painter->shaders();
57 }
58 return shaders;
59}
60
61void DisplayGL::startDrawing(std::shared_ptr<CoreController> controller) {
62 if (m_drawThread) {
63 return;
64 }
65 m_isDrawing = true;
66 m_painter->setContext(controller);
67 m_painter->setMessagePainter(messagePainter());
68 m_context = controller;
69 m_painter->resize(size());
70 m_gl->move(0, 0);
71 m_drawThread = new QThread(this);
72 m_drawThread->setObjectName("Painter Thread");
73 m_gl->context()->doneCurrent();
74 m_gl->context()->moveToThread(m_drawThread);
75 m_painter->moveToThread(m_drawThread);
76 connect(m_drawThread, &QThread::started, m_painter, &PainterGL::start);
77 m_drawThread->start();
78
79 lockAspectRatio(isAspectRatioLocked());
80 lockIntegerScaling(isIntegerScalingLocked());
81 filter(isFiltered());
82#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
83 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatioF());
84#else
85 messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatio());
86#endif
87 resizePainter();
88}
89
90void DisplayGL::stopDrawing() {
91 if (m_drawThread) {
92 m_isDrawing = false;
93 CoreController::Interrupter interrupter(m_context);
94 QMetaObject::invokeMethod(m_painter, "stop", Qt::BlockingQueuedConnection);
95 m_drawThread->exit();
96 m_drawThread = nullptr;
97 }
98 m_context.reset();
99}
100
101void DisplayGL::pauseDrawing() {
102 if (m_drawThread) {
103 m_isDrawing = false;
104 CoreController::Interrupter interrupter(m_context);
105 QMetaObject::invokeMethod(m_painter, "pause", Qt::BlockingQueuedConnection);
106 }
107}
108
109void DisplayGL::unpauseDrawing() {
110 if (m_drawThread) {
111 m_isDrawing = true;
112 CoreController::Interrupter interrupter(m_context);
113 QMetaObject::invokeMethod(m_painter, "unpause", Qt::BlockingQueuedConnection);
114 }
115}
116
117void DisplayGL::forceDraw() {
118 if (m_drawThread) {
119 QMetaObject::invokeMethod(m_painter, "forceDraw");
120 }
121}
122
123void DisplayGL::lockAspectRatio(bool lock) {
124 Display::lockAspectRatio(lock);
125 if (m_drawThread) {
126 QMetaObject::invokeMethod(m_painter, "lockAspectRatio", Q_ARG(bool, lock));
127 }
128}
129
130void DisplayGL::lockIntegerScaling(bool lock) {
131 Display::lockIntegerScaling(lock);
132 if (m_drawThread) {
133 QMetaObject::invokeMethod(m_painter, "lockIntegerScaling", Q_ARG(bool, lock));
134 }
135}
136
137void DisplayGL::filter(bool filter) {
138 Display::filter(filter);
139 if (m_drawThread) {
140 QMetaObject::invokeMethod(m_painter, "filter", Q_ARG(bool, filter));
141 }
142}
143
144void DisplayGL::framePosted() {
145 if (m_drawThread) {
146 m_painter->enqueue(m_context->drawContext());
147 QMetaObject::invokeMethod(m_painter, "draw");
148 }
149}
150
151void DisplayGL::setShaders(struct VDir* shaders) {
152 if (m_drawThread) {
153 QMetaObject::invokeMethod(m_painter, "setShaders", Qt::BlockingQueuedConnection, Q_ARG(struct VDir*, shaders));
154 } else {
155 m_painter->setShaders(shaders);
156 }
157}
158
159void DisplayGL::clearShaders() {
160 QMetaObject::invokeMethod(m_painter, "clearShaders");
161}
162
163
164void DisplayGL::resizeContext() {
165 if (m_drawThread) {
166 m_isDrawing = false;
167 CoreController::Interrupter interrupter(m_context);
168 QMetaObject::invokeMethod(m_painter, "resizeContext", Qt::BlockingQueuedConnection);
169 }
170}
171
172void DisplayGL::resizeEvent(QResizeEvent* event) {
173 Display::resizeEvent(event);
174 resizePainter();
175}
176
177void DisplayGL::resizePainter() {
178 if (m_gl) {
179 m_gl->resize(size());
180 }
181 if (m_drawThread) {
182 QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, size()));
183 }
184}
185
186PainterGL::PainterGL(int majorVersion, QGLWidget* parent)
187 : m_gl(parent)
188{
189#ifdef BUILD_GL
190 mGLContext* glBackend;
191#endif
192#if !defined(_WIN32) || defined(USE_EPOXY)
193 mGLES2Context* gl2Backend;
194#endif
195
196#if !defined(_WIN32) || defined(USE_EPOXY)
197 if (majorVersion >= 2) {
198 gl2Backend = static_cast<mGLES2Context*>(malloc(sizeof(mGLES2Context)));
199 mGLES2ContextCreate(gl2Backend);
200 m_backend = &gl2Backend->d;
201 m_supportsShaders = true;
202 }
203#endif
204
205#ifdef BUILD_GL
206 if (!m_backend) {
207 glBackend = static_cast<mGLContext*>(malloc(sizeof(mGLContext)));
208 mGLContextCreate(glBackend);
209 m_backend = &glBackend->d;
210 m_supportsShaders = false;
211 }
212#endif
213 m_backend->swap = [](VideoBackend* v) {
214 PainterGL* painter = static_cast<PainterGL*>(v->user);
215 painter->m_gl->swapBuffers();
216 };
217
218 m_gl->makeCurrent();
219#if defined(_WIN32) && defined(USE_EPOXY)
220 epoxy_handle_external_wglMakeCurrent();
221#endif
222 m_backend->init(m_backend, reinterpret_cast<WHandle>(m_gl->winId()));
223#if !defined(_WIN32) || defined(USE_EPOXY)
224 if (m_supportsShaders) {
225 m_shader.preprocessShader = static_cast<void*>(&reinterpret_cast<mGLES2Context*>(m_backend)->initialShader);
226 }
227#endif
228 m_gl->doneCurrent();
229
230 m_backend->user = this;
231 m_backend->filter = false;
232 m_backend->lockAspectRatio = false;
233
234 for (int i = 0; i < 2; ++i) {
235 m_free.append(new uint32_t[256 * 256]);
236 }
237}
238
239PainterGL::~PainterGL() {
240 while (!m_queue.isEmpty()) {
241 delete[] m_queue.dequeue();
242 }
243 for (auto item : m_free) {
244 delete[] item;
245 }
246 m_gl->makeCurrent();
247#if defined(_WIN32) && defined(USE_EPOXY)
248 epoxy_handle_external_wglMakeCurrent();
249#endif
250#if !defined(_WIN32) || defined(USE_EPOXY)
251 if (m_shader.passes) {
252 mGLES2ShaderFree(&m_shader);
253 }
254#endif
255 m_backend->deinit(m_backend);
256 m_gl->doneCurrent();
257 free(m_backend);
258 m_backend = nullptr;
259}
260
261void PainterGL::setContext(std::shared_ptr<CoreController> context) {
262 m_context = context;
263 resizeContext();
264}
265
266void PainterGL::resizeContext() {
267 if (!m_context) {
268 return;
269 }
270
271 m_gl->makeCurrent();
272#if defined(_WIN32) && defined(USE_EPOXY)
273 epoxy_handle_external_wglMakeCurrent();
274#endif
275 QSize size = m_context->screenDimensions();
276 m_backend->setDimensions(m_backend, size.width(), size.height());
277 m_gl->doneCurrent();
278}
279
280void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
281 m_messagePainter = messagePainter;
282}
283
284void PainterGL::resize(const QSize& size) {
285 m_size = size;
286 if (m_started && !m_active) {
287 forceDraw();
288 }
289}
290
291void PainterGL::lockAspectRatio(bool lock) {
292 m_backend->lockAspectRatio = lock;
293 if (m_started && !m_active) {
294 forceDraw();
295 }
296}
297
298void PainterGL::lockIntegerScaling(bool lock) {
299 m_backend->lockIntegerScaling = lock;
300 if (m_started && !m_active) {
301 forceDraw();
302 }
303}
304
305void PainterGL::filter(bool filter) {
306 m_backend->filter = filter;
307 if (m_started && !m_active) {
308 forceDraw();
309 }
310}
311
312void PainterGL::start() {
313 m_gl->makeCurrent();
314#if defined(_WIN32) && defined(USE_EPOXY)
315 epoxy_handle_external_wglMakeCurrent();
316#endif
317
318#if !defined(_WIN32) || defined(USE_EPOXY)
319 if (m_supportsShaders && m_shader.passes) {
320 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
321 }
322#endif
323
324 m_gl->doneCurrent();
325 m_active = true;
326 m_started = true;
327}
328
329void PainterGL::draw() {
330 if (m_queue.isEmpty()) {
331 return;
332 }
333
334 if (mCoreSyncWaitFrameStart(&m_context->thread()->impl->sync) || !m_queue.isEmpty()) {
335 dequeue();
336 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
337 m_painter.begin(m_gl->context()->device());
338 performDraw();
339 m_painter.end();
340 m_backend->swap(m_backend);
341 if (!m_delayTimer.isValid()) {
342 m_delayTimer.start();
343 } else {
344 while (m_delayTimer.elapsed() < 15) {
345 QThread::usleep(100);
346 }
347 m_delayTimer.restart();
348 }
349 } else {
350 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
351 }
352 if (!m_queue.isEmpty()) {
353 QMetaObject::invokeMethod(this, "draw", Qt::QueuedConnection);
354 }
355}
356
357void PainterGL::forceDraw() {
358 m_painter.begin(m_gl->context()->device());
359 performDraw();
360 m_painter.end();
361 m_backend->swap(m_backend);
362}
363
364void PainterGL::stop() {
365 m_active = false;
366 m_started = false;
367 m_gl->makeCurrent();
368#if defined(_WIN32) && defined(USE_EPOXY)
369 epoxy_handle_external_wglMakeCurrent();
370#endif
371 dequeueAll();
372 m_backend->clear(m_backend);
373 m_backend->swap(m_backend);
374 m_gl->doneCurrent();
375 m_gl->context()->moveToThread(m_gl->thread());
376 m_context.reset();
377 moveToThread(m_gl->thread());
378}
379
380void PainterGL::pause() {
381 m_active = false;
382}
383
384void PainterGL::unpause() {
385 m_active = true;
386}
387
388void PainterGL::performDraw() {
389 m_painter.beginNativePainting();
390#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
391 float r = m_gl->devicePixelRatioF();
392#else
393 float r = m_gl->devicePixelRatio();
394#endif
395 m_backend->resized(m_backend, m_size.width() * r, m_size.height() * r);
396 m_backend->drawFrame(m_backend);
397 m_painter.endNativePainting();
398 if (m_messagePainter) {
399 m_messagePainter->paint(&m_painter);
400 }
401}
402
403void PainterGL::enqueue(const uint32_t* backing) {
404 m_mutex.lock();
405 uint32_t* buffer;
406 if (m_free.isEmpty()) {
407 buffer = m_queue.dequeue();
408 } else {
409 buffer = m_free.takeLast();
410 }
411 QSize size = m_context->screenDimensions();
412 memcpy(buffer, backing, size.width() * size.height() * BYTES_PER_PIXEL);
413 m_queue.enqueue(buffer);
414 m_mutex.unlock();
415}
416
417void PainterGL::dequeue() {
418 m_mutex.lock();
419 if (m_queue.isEmpty()) {
420 m_mutex.unlock();
421 return;
422 }
423 uint32_t* buffer = m_queue.dequeue();
424 m_backend->postFrame(m_backend, buffer);
425 m_free.append(buffer);
426 m_mutex.unlock();
427}
428
429void PainterGL::dequeueAll() {
430 uint32_t* buffer = 0;
431 m_mutex.lock();
432 while (!m_queue.isEmpty()) {
433 buffer = m_queue.dequeue();
434 m_free.append(buffer);
435 }
436 if (buffer) {
437 m_backend->postFrame(m_backend, buffer);
438 }
439 m_mutex.unlock();
440}
441
442void PainterGL::setShaders(struct VDir* dir) {
443 if (!supportsShaders()) {
444 return;
445 }
446#if !defined(_WIN32) || defined(USE_EPOXY)
447 m_gl->makeCurrent();
448#if defined(_WIN32) && defined(USE_EPOXY)
449 epoxy_handle_external_wglMakeCurrent();
450#endif
451 if (m_shader.passes) {
452 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
453 mGLES2ShaderFree(&m_shader);
454 }
455 mGLES2ShaderLoad(&m_shader, dir);
456 if (m_started) {
457 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
458 }
459 m_gl->doneCurrent();
460#endif
461}
462
463void PainterGL::clearShaders() {
464 if (!supportsShaders()) {
465 return;
466 }
467#if !defined(_WIN32) || defined(USE_EPOXY)
468 m_gl->makeCurrent();
469#if defined(_WIN32) && defined(USE_EPOXY)
470 epoxy_handle_external_wglMakeCurrent();
471#endif
472 if (m_shader.passes) {
473 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
474 mGLES2ShaderFree(&m_shader);
475 }
476 m_gl->doneCurrent();
477#endif
478}
479
480VideoShader* PainterGL::shaders() {
481 return &m_shader;
482}
483
484#endif