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#include <QApplication>
  9#include <QResizeEvent>
 10
 11extern "C" {
 12#include "gba/supervisor/thread.h"
 13}
 14
 15using namespace QGBA;
 16
 17DisplayGL::DisplayGL(const QGLFormat& format, QWidget* parent)
 18	: Display(parent)
 19	, m_gl(new EmptyGLWidget(format, this))
 20	, m_painter(new PainterGL(m_gl))
 21	, m_drawThread(nullptr)
 22	, m_context(nullptr)
 23{
 24	m_gl->setMouseTracking(true);
 25	m_gl->setAttribute(Qt::WA_TransparentForMouseEvents); // This doesn't seem to work?
 26}
 27
 28DisplayGL::~DisplayGL() {
 29	delete m_painter;
 30}
 31
 32void DisplayGL::startDrawing(GBAThread* thread) {
 33	if (m_drawThread) {
 34		return;
 35	}
 36	m_painter->setContext(thread);
 37	m_painter->setMessagePainter(messagePainter());
 38	m_context = thread;
 39	m_painter->resize(size());
 40	m_gl->move(0, 0);
 41	m_drawThread = new QThread(this);
 42	m_drawThread->setObjectName("Painter Thread");
 43	m_gl->context()->doneCurrent();
 44	m_gl->context()->moveToThread(m_drawThread);
 45	m_painter->moveToThread(m_drawThread);
 46	connect(m_drawThread, SIGNAL(started()), m_painter, SLOT(start()));
 47	m_drawThread->start();
 48	GBASyncSetVideoSync(&m_context->sync, false);
 49
 50	lockAspectRatio(isAspectRatioLocked());
 51	filter(isFiltered());
 52	messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatio());
 53	resizePainter();
 54}
 55
 56void DisplayGL::stopDrawing() {
 57	if (m_drawThread) {
 58		if (GBAThreadIsActive(m_context)) {
 59			GBAThreadInterrupt(m_context);
 60		}
 61		QMetaObject::invokeMethod(m_painter, "stop", Qt::BlockingQueuedConnection);
 62		m_drawThread->exit();
 63		m_drawThread = nullptr;
 64		if (GBAThreadIsActive(m_context)) {
 65			GBAThreadContinue(m_context);
 66		}
 67	}
 68}
 69
 70void DisplayGL::pauseDrawing() {
 71	if (m_drawThread) {
 72		if (GBAThreadIsActive(m_context)) {
 73			GBAThreadInterrupt(m_context);
 74		}
 75		QMetaObject::invokeMethod(m_painter, "pause", Qt::BlockingQueuedConnection);
 76		if (GBAThreadIsActive(m_context)) {
 77			GBAThreadContinue(m_context);
 78		}
 79	}
 80}
 81
 82void DisplayGL::unpauseDrawing() {
 83	if (m_drawThread) {
 84		if (GBAThreadIsActive(m_context)) {
 85			GBAThreadInterrupt(m_context);
 86		}
 87		QMetaObject::invokeMethod(m_painter, "unpause", Qt::BlockingQueuedConnection);
 88		if (GBAThreadIsActive(m_context)) {
 89			GBAThreadContinue(m_context);
 90		}
 91	}
 92}
 93
 94void DisplayGL::forceDraw() {
 95	if (m_drawThread) {
 96		QMetaObject::invokeMethod(m_painter, "forceDraw");
 97	}
 98}
 99
100void DisplayGL::lockAspectRatio(bool lock) {
101	Display::lockAspectRatio(lock);
102	if (m_drawThread) {
103		QMetaObject::invokeMethod(m_painter, "lockAspectRatio", Q_ARG(bool, lock));
104	}
105}
106
107void DisplayGL::filter(bool filter) {
108	Display::filter(filter);
109	if (m_drawThread) {
110		QMetaObject::invokeMethod(m_painter, "filter", Q_ARG(bool, filter));
111	}
112}
113
114void DisplayGL::framePosted(const uint32_t* buffer) {
115	if (m_drawThread && buffer) {
116		QMetaObject::invokeMethod(m_painter, "setBacking", Q_ARG(const uint32_t*, buffer));
117	}
118}
119
120void DisplayGL::resizeEvent(QResizeEvent* event) {
121	Display::resizeEvent(event);
122	resizePainter();
123}
124
125void DisplayGL::resizePainter() {
126	m_gl->resize(size());
127	if (m_drawThread) {
128		QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, size()));
129	}
130}
131
132PainterGL::PainterGL(QGLWidget* parent)
133	: m_gl(parent)
134	, m_active(false)
135	, m_context(nullptr)
136	, m_messagePainter(nullptr)
137{
138	GBAGLContextCreate(&m_backend);
139	m_backend.d.swap = [](VideoBackend* v) {
140		PainterGL* painter = static_cast<PainterGL*>(v->user);
141		painter->m_gl->swapBuffers();
142	};
143	m_backend.d.user = this;
144	m_backend.d.filter = false;
145	m_backend.d.lockAspectRatio = false;
146}
147
148void PainterGL::setContext(GBAThread* context) {
149	m_context = context;
150}
151
152void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
153	m_messagePainter = messagePainter;
154}
155
156void PainterGL::setBacking(const uint32_t* backing) {
157	m_gl->makeCurrent();
158	m_backend.d.postFrame(&m_backend.d, backing);
159	if (m_active) {
160		draw();
161	}
162	m_gl->doneCurrent();
163}
164
165void PainterGL::resize(const QSize& size) {
166	m_size = size;
167	if (m_active) {
168		forceDraw();
169	}
170}
171
172void PainterGL::lockAspectRatio(bool lock) {
173	m_backend.d.lockAspectRatio = lock;
174	if (m_active) {
175		forceDraw();
176	}
177}
178
179void PainterGL::filter(bool filter) {
180	m_backend.d.filter = filter;
181	if (m_active) {
182		forceDraw();
183	}
184}
185
186void PainterGL::start() {
187	m_gl->makeCurrent();
188	m_backend.d.init(&m_backend.d, reinterpret_cast<WHandle>(m_gl->winId()));
189	m_gl->doneCurrent();
190	m_active = true;
191}
192
193void PainterGL::draw() {
194	if (GBASyncWaitFrameStart(&m_context->sync, m_context->frameskip)) {
195		m_painter.begin(m_gl->context()->device());
196		performDraw();
197		m_painter.end();
198		GBASyncWaitFrameEnd(&m_context->sync);
199		m_backend.d.swap(&m_backend.d);
200	} else {
201		GBASyncWaitFrameEnd(&m_context->sync);
202	}
203}
204
205void PainterGL::forceDraw() {
206	m_painter.begin(m_gl->context()->device());
207	performDraw();
208	m_painter.end();
209	m_backend.d.swap(&m_backend.d);
210}
211
212void PainterGL::stop() {
213	m_active = false;
214	m_gl->makeCurrent();
215	m_backend.d.clear(&m_backend.d);
216	m_backend.d.swap(&m_backend.d);
217	m_backend.d.deinit(&m_backend.d);
218	m_gl->doneCurrent();
219	m_gl->context()->moveToThread(m_gl->thread());
220	moveToThread(m_gl->thread());
221}
222
223void PainterGL::pause() {
224	m_active = false;
225	// Make sure both buffers are filled
226	forceDraw();
227	forceDraw();
228}
229
230void PainterGL::unpause() {
231	m_active = true;
232}
233
234void PainterGL::performDraw() {
235	m_painter.beginNativePainting();
236	float r = m_gl->devicePixelRatio();
237	m_backend.d.resized(&m_backend.d, m_size.width() * r, m_size.height() * r);
238	m_backend.d.drawFrame(&m_backend.d);
239	m_painter.endNativePainting();
240	if (m_messagePainter) {
241		m_messagePainter->paint(&m_painter);
242	}
243}