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