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 m_gl->makeCurrent();
197#if defined(_WIN32) && defined(USE_EPOXY)
198 epoxy_handle_external_wglMakeCurrent();
199#endif
200
201 QStringList extensions = QString(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS))).split(' ');
202
203#if !defined(_WIN32) || defined(USE_EPOXY)
204 if (extensions.contains("GL_ARB_framebuffer_object") && majorVersion >= 2) {
205 gl2Backend = static_cast<mGLES2Context*>(malloc(sizeof(mGLES2Context)));
206 mGLES2ContextCreate(gl2Backend);
207 m_backend = &gl2Backend->d;
208 m_supportsShaders = true;
209 }
210#endif
211
212#ifdef BUILD_GL
213 if (!m_backend) {
214 glBackend = static_cast<mGLContext*>(malloc(sizeof(mGLContext)));
215 mGLContextCreate(glBackend);
216 m_backend = &glBackend->d;
217 m_supportsShaders = false;
218 }
219#endif
220 m_backend->swap = [](VideoBackend* v) {
221 PainterGL* painter = static_cast<PainterGL*>(v->user);
222 painter->m_gl->swapBuffers();
223 };
224
225 m_backend->init(m_backend, reinterpret_cast<WHandle>(m_gl->winId()));
226#if !defined(_WIN32) || defined(USE_EPOXY)
227 if (m_supportsShaders) {
228 m_shader.preprocessShader = static_cast<void*>(&reinterpret_cast<mGLES2Context*>(m_backend)->initialShader);
229 }
230#endif
231 m_gl->doneCurrent();
232
233 m_backend->user = this;
234 m_backend->filter = false;
235 m_backend->lockAspectRatio = false;
236
237 for (int i = 0; i < 2; ++i) {
238 m_free.append(new uint32_t[256 * 256]);
239 }
240}
241
242PainterGL::~PainterGL() {
243 while (!m_queue.isEmpty()) {
244 delete[] m_queue.dequeue();
245 }
246 for (auto item : m_free) {
247 delete[] item;
248 }
249 m_gl->makeCurrent();
250#if defined(_WIN32) && defined(USE_EPOXY)
251 epoxy_handle_external_wglMakeCurrent();
252#endif
253#if !defined(_WIN32) || defined(USE_EPOXY)
254 if (m_shader.passes) {
255 mGLES2ShaderFree(&m_shader);
256 }
257#endif
258 m_backend->deinit(m_backend);
259 m_gl->doneCurrent();
260 free(m_backend);
261 m_backend = nullptr;
262}
263
264void PainterGL::setContext(std::shared_ptr<CoreController> context) {
265 m_context = context;
266 resizeContext();
267}
268
269void PainterGL::resizeContext() {
270 if (!m_context) {
271 return;
272 }
273
274 m_gl->makeCurrent();
275#if defined(_WIN32) && defined(USE_EPOXY)
276 epoxy_handle_external_wglMakeCurrent();
277#endif
278 QSize size = m_context->screenDimensions();
279 m_backend->setDimensions(m_backend, size.width(), size.height());
280 m_gl->doneCurrent();
281}
282
283void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
284 m_messagePainter = messagePainter;
285}
286
287void PainterGL::resize(const QSize& size) {
288 m_size = size;
289 if (m_started && !m_active) {
290 forceDraw();
291 }
292}
293
294void PainterGL::lockAspectRatio(bool lock) {
295 m_backend->lockAspectRatio = lock;
296 if (m_started && !m_active) {
297 forceDraw();
298 }
299}
300
301void PainterGL::lockIntegerScaling(bool lock) {
302 m_backend->lockIntegerScaling = lock;
303 if (m_started && !m_active) {
304 forceDraw();
305 }
306}
307
308void PainterGL::filter(bool filter) {
309 m_backend->filter = filter;
310 if (m_started && !m_active) {
311 forceDraw();
312 }
313}
314
315void PainterGL::start() {
316 m_gl->makeCurrent();
317#if defined(_WIN32) && defined(USE_EPOXY)
318 epoxy_handle_external_wglMakeCurrent();
319#endif
320
321#if !defined(_WIN32) || defined(USE_EPOXY)
322 if (m_supportsShaders && m_shader.passes) {
323 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
324 }
325#endif
326
327 m_gl->doneCurrent();
328 m_active = true;
329 m_started = true;
330}
331
332void PainterGL::draw() {
333 if (m_queue.isEmpty()) {
334 return;
335 }
336
337 if (mCoreSyncWaitFrameStart(&m_context->thread()->impl->sync) || !m_queue.isEmpty()) {
338 dequeue();
339 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
340 m_painter.begin(m_gl->context()->device());
341 performDraw();
342 m_painter.end();
343 m_backend->swap(m_backend);
344 if (!m_delayTimer.isValid()) {
345 m_delayTimer.start();
346 } else {
347 while (m_delayTimer.elapsed() < 15) {
348 QThread::usleep(100);
349 }
350 m_delayTimer.restart();
351 }
352 } else {
353 mCoreSyncWaitFrameEnd(&m_context->thread()->impl->sync);
354 }
355 if (!m_queue.isEmpty()) {
356 QMetaObject::invokeMethod(this, "draw", Qt::QueuedConnection);
357 }
358}
359
360void PainterGL::forceDraw() {
361 m_painter.begin(m_gl->context()->device());
362 performDraw();
363 m_painter.end();
364 m_backend->swap(m_backend);
365}
366
367void PainterGL::stop() {
368 m_active = false;
369 m_started = false;
370 m_gl->makeCurrent();
371#if defined(_WIN32) && defined(USE_EPOXY)
372 epoxy_handle_external_wglMakeCurrent();
373#endif
374 dequeueAll();
375 m_backend->clear(m_backend);
376 m_backend->swap(m_backend);
377 m_gl->doneCurrent();
378 m_gl->context()->moveToThread(m_gl->thread());
379 m_context.reset();
380 moveToThread(m_gl->thread());
381}
382
383void PainterGL::pause() {
384 m_active = false;
385}
386
387void PainterGL::unpause() {
388 m_active = true;
389}
390
391void PainterGL::performDraw() {
392 m_painter.beginNativePainting();
393#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
394 float r = m_gl->devicePixelRatioF();
395#else
396 float r = m_gl->devicePixelRatio();
397#endif
398 m_backend->resized(m_backend, m_size.width() * r, m_size.height() * r);
399 m_backend->drawFrame(m_backend);
400 m_painter.endNativePainting();
401 if (m_messagePainter) {
402 m_messagePainter->paint(&m_painter);
403 }
404}
405
406void PainterGL::enqueue(const uint32_t* backing) {
407 m_mutex.lock();
408 uint32_t* buffer;
409 if (m_free.isEmpty()) {
410 buffer = m_queue.dequeue();
411 } else {
412 buffer = m_free.takeLast();
413 }
414 QSize size = m_context->screenDimensions();
415 memcpy(buffer, backing, size.width() * size.height() * BYTES_PER_PIXEL);
416 m_queue.enqueue(buffer);
417 m_mutex.unlock();
418}
419
420void PainterGL::dequeue() {
421 m_mutex.lock();
422 if (m_queue.isEmpty()) {
423 m_mutex.unlock();
424 return;
425 }
426 uint32_t* buffer = m_queue.dequeue();
427 m_backend->postFrame(m_backend, buffer);
428 m_free.append(buffer);
429 m_mutex.unlock();
430}
431
432void PainterGL::dequeueAll() {
433 uint32_t* buffer = 0;
434 m_mutex.lock();
435 while (!m_queue.isEmpty()) {
436 buffer = m_queue.dequeue();
437 m_free.append(buffer);
438 }
439 if (buffer) {
440 m_backend->postFrame(m_backend, buffer);
441 }
442 m_mutex.unlock();
443}
444
445void PainterGL::setShaders(struct VDir* dir) {
446 if (!supportsShaders()) {
447 return;
448 }
449#if !defined(_WIN32) || defined(USE_EPOXY)
450 m_gl->makeCurrent();
451#if defined(_WIN32) && defined(USE_EPOXY)
452 epoxy_handle_external_wglMakeCurrent();
453#endif
454 if (m_shader.passes) {
455 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
456 mGLES2ShaderFree(&m_shader);
457 }
458 mGLES2ShaderLoad(&m_shader, dir);
459 if (m_started) {
460 mGLES2ShaderAttach(reinterpret_cast<mGLES2Context*>(m_backend), static_cast<mGLES2Shader*>(m_shader.passes), m_shader.nPasses);
461 }
462 m_gl->doneCurrent();
463#endif
464}
465
466void PainterGL::clearShaders() {
467 if (!supportsShaders()) {
468 return;
469 }
470#if !defined(_WIN32) || defined(USE_EPOXY)
471 m_gl->makeCurrent();
472#if defined(_WIN32) && defined(USE_EPOXY)
473 epoxy_handle_external_wglMakeCurrent();
474#endif
475 if (m_shader.passes) {
476 mGLES2ShaderDetach(reinterpret_cast<mGLES2Context*>(m_backend));
477 mGLES2ShaderFree(&m_shader);
478 }
479 m_gl->doneCurrent();
480#endif
481}
482
483VideoShader* PainterGL::shaders() {
484 return &m_shader;
485}
486
487#endif