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#ifdef BUILD_GL
 15#include "platform/opengl/gl.h"
 16#endif
 17#if !defined(_WIN32) || defined(USE_EPOXY)
 18#include "platform/opengl/gles2.h"
 19#ifdef _WIN32
 20#include <epoxy/wgl.h>
 21#endif
 22#endif
 23}
 24
 25using namespace QGBA;
 26
 27DisplayGL::DisplayGL(const QGLFormat& format, QWidget* parent)
 28	: Display(parent)
 29	, m_isDrawing(false)
 30	, m_gl(new EmptyGLWidget(format, this))
 31	, m_drawThread(nullptr)
 32	, m_context(nullptr)
 33{
 34	m_painter = new PainterGL(m_gl, QGLFormat::openGLVersionFlags());
 35	m_gl->setMouseTracking(true);
 36	m_gl->setAttribute(Qt::WA_TransparentForMouseEvents); // This doesn't seem to work?
 37}
 38
 39DisplayGL::~DisplayGL() {
 40	delete m_painter;
 41}
 42
 43bool DisplayGL::supportsShaders() const {
 44	return m_painter->supportsShaders();
 45}
 46
 47VideoShader* DisplayGL::shaders() {
 48	VideoShader* shaders = nullptr;
 49	if (m_drawThread) {
 50		QMetaObject::invokeMethod(m_painter, "shaders", Qt::BlockingQueuedConnection, Q_RETURN_ARG(VideoShader*, shaders));
 51	} else {
 52		shaders = m_painter->shaders();
 53	}
 54	return shaders;
 55}
 56
 57void DisplayGL::startDrawing(GBAThread* thread) {
 58	if (m_drawThread) {
 59		return;
 60	}
 61	m_isDrawing = true;
 62	m_painter->setContext(thread);
 63	m_painter->setMessagePainter(messagePainter());
 64	m_context = thread;
 65	m_painter->resize(size());
 66	m_gl->move(0, 0);
 67	m_drawThread = new QThread(this);
 68	m_drawThread->setObjectName("Painter Thread");
 69	m_gl->context()->doneCurrent();
 70	m_gl->context()->moveToThread(m_drawThread);
 71	m_painter->moveToThread(m_drawThread);
 72	connect(m_drawThread, SIGNAL(started()), m_painter, SLOT(start()));
 73	m_drawThread->start();
 74	GBASyncSetVideoSync(&m_context->sync, false);
 75
 76	lockAspectRatio(isAspectRatioLocked());
 77	filter(isFiltered());
 78	messagePainter()->resize(size(), isAspectRatioLocked(), devicePixelRatio());
 79	resizePainter();
 80}
 81
 82void DisplayGL::stopDrawing() {
 83	if (m_drawThread) {
 84		m_isDrawing = false;
 85		if (GBAThreadIsActive(m_context)) {
 86			GBAThreadInterrupt(m_context);
 87		}
 88		QMetaObject::invokeMethod(m_painter, "stop", Qt::BlockingQueuedConnection);
 89		m_drawThread->exit();
 90		m_drawThread = nullptr;
 91		if (GBAThreadIsActive(m_context)) {
 92			GBAThreadContinue(m_context);
 93		}
 94	}
 95}
 96
 97void DisplayGL::pauseDrawing() {
 98	if (m_drawThread) {
 99		m_isDrawing = false;
100		if (GBAThreadIsActive(m_context)) {
101			GBAThreadInterrupt(m_context);
102		}
103		QMetaObject::invokeMethod(m_painter, "pause", Qt::BlockingQueuedConnection);
104		if (GBAThreadIsActive(m_context)) {
105			GBAThreadContinue(m_context);
106		}
107	}
108}
109
110void DisplayGL::unpauseDrawing() {
111	if (m_drawThread) {
112		m_isDrawing = true;
113		if (GBAThreadIsActive(m_context)) {
114			GBAThreadInterrupt(m_context);
115		}
116		QMetaObject::invokeMethod(m_painter, "unpause", Qt::BlockingQueuedConnection);
117		if (GBAThreadIsActive(m_context)) {
118			GBAThreadContinue(m_context);
119		}
120	}
121}
122
123void DisplayGL::forceDraw() {
124	if (m_drawThread) {
125		QMetaObject::invokeMethod(m_painter, "forceDraw");
126	}
127}
128
129void DisplayGL::lockAspectRatio(bool lock) {
130	Display::lockAspectRatio(lock);
131	if (m_drawThread) {
132		QMetaObject::invokeMethod(m_painter, "lockAspectRatio", 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(const uint32_t* buffer) {
144	if (m_drawThread && buffer) {
145		m_painter->enqueue(buffer);
146		QMetaObject::invokeMethod(m_painter, "draw");
147	}
148}
149
150void DisplayGL::setShaders(struct VDir* shaders) {
151	QMetaObject::invokeMethod(m_painter, "setShaders", Q_ARG(struct VDir*, shaders));
152}
153
154void DisplayGL::resizeEvent(QResizeEvent* event) {
155	Display::resizeEvent(event);
156	resizePainter();
157}
158
159void DisplayGL::resizePainter() {
160	m_gl->resize(size());
161	if (m_drawThread) {
162		QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, size()));
163	}
164}
165
166PainterGL::PainterGL(QGLWidget* parent, QGLFormat::OpenGLVersionFlags glVersion)
167	: m_gl(parent)
168	, m_active(false)
169	, m_started(false)
170	, m_context(nullptr)
171	, m_shader{}
172	, m_backend(nullptr)
173	, m_messagePainter(nullptr)
174{
175#ifdef BUILD_GL
176	GBAGLContext* glBackend;
177#endif
178#if !defined(_WIN32) || defined(USE_EPOXY)
179	GBAGLES2Context* gl2Backend;
180#endif
181
182#if !defined(_WIN32) || defined(USE_EPOXY)
183	if (glVersion & QGLFormat::OpenGL_Version_3_0) {
184		gl2Backend = new GBAGLES2Context;
185		GBAGLES2ContextCreate(gl2Backend);
186		m_backend = &gl2Backend->d;
187		m_supportsShaders = true;
188	}
189#endif
190
191#ifdef BUILD_GL
192	 if (!m_backend) {
193		glBackend = new GBAGLContext;
194		GBAGLContextCreate(glBackend);
195		m_backend = &glBackend->d;
196		m_supportsShaders = false;
197	}
198#endif
199	m_backend->swap = [](VideoBackend* v) {
200		PainterGL* painter = static_cast<PainterGL*>(v->user);
201		painter->m_gl->swapBuffers();
202	};
203	m_backend->user = this;
204	m_backend->filter = false;
205	m_backend->lockAspectRatio = false;
206
207	for (int i = 0; i < 2; ++i) {
208		m_free.append(new uint32_t[256 * 256]);
209	}
210}
211
212PainterGL::~PainterGL() {
213	while (!m_queue.isEmpty()) {
214		delete[] m_queue.dequeue();
215	}
216	for (auto item : m_free) {
217		delete[] item;
218	}
219	delete m_backend;
220	m_backend = nullptr;
221	if (m_shader.passes) {
222		GBAGLES2ShaderFree(&m_shader);
223	}
224}
225
226void PainterGL::setContext(GBAThread* context) {
227	m_context = context;
228}
229
230void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
231	m_messagePainter = messagePainter;
232}
233
234void PainterGL::resize(const QSize& size) {
235	m_size = size;
236	if (m_started && !m_active) {
237		forceDraw();
238	}
239}
240
241void PainterGL::lockAspectRatio(bool lock) {
242	m_backend->lockAspectRatio = lock;
243	if (m_started && !m_active) {
244		forceDraw();
245	}
246}
247
248void PainterGL::filter(bool filter) {
249	m_backend->filter = filter;
250	if (m_started && !m_active) {
251		forceDraw();
252	}
253}
254
255void PainterGL::start() {
256	m_gl->makeCurrent();
257#if defined(_WIN32) && defined(USE_EPOXY)
258	epoxy_handle_external_wglMakeCurrent();
259#endif
260	m_backend->init(m_backend, reinterpret_cast<WHandle>(m_gl->winId()));
261
262#if !defined(_WIN32) || defined(USE_EPOXY)
263	if (m_shader.passes) {
264		GBAGLES2ShaderAttach(reinterpret_cast<GBAGLES2Context*>(m_backend), static_cast<GBAGLES2Shader*>(m_shader.passes), m_shader.nPasses);
265	}
266#endif
267
268	m_gl->doneCurrent();
269	m_active = true;
270	m_started = true;
271}
272
273void PainterGL::draw() {
274	if (m_queue.isEmpty() || !GBAThreadIsActive(m_context)) {
275		return;
276	}
277	if (GBASyncWaitFrameStart(&m_context->sync) || !m_queue.isEmpty()) {
278		dequeue();
279		GBASyncWaitFrameEnd(&m_context->sync);
280		m_painter.begin(m_gl->context()->device());
281		performDraw();
282		m_painter.end();
283		m_backend->swap(m_backend);
284	} else {
285		GBASyncWaitFrameEnd(&m_context->sync);
286	}
287	if (!m_queue.isEmpty()) {
288		QMetaObject::invokeMethod(this, "draw", Qt::QueuedConnection);
289	}
290}
291
292void PainterGL::forceDraw() {
293	m_painter.begin(m_gl->context()->device());
294	performDraw();
295	m_painter.end();
296	m_backend->swap(m_backend);
297}
298
299void PainterGL::stop() {
300	m_active = false;
301	m_started = false;
302	m_gl->makeCurrent();
303#if defined(_WIN32) && defined(USE_EPOXY)
304	epoxy_handle_external_wglMakeCurrent();
305#endif
306	dequeueAll();
307	m_backend->clear(m_backend);
308	m_backend->swap(m_backend);
309	m_backend->deinit(m_backend);
310	m_gl->doneCurrent();
311	m_gl->context()->moveToThread(m_gl->thread());
312	moveToThread(m_gl->thread());
313}
314
315void PainterGL::pause() {
316	m_active = false;
317}
318
319void PainterGL::unpause() {
320	m_active = true;
321}
322
323void PainterGL::performDraw() {
324	m_painter.beginNativePainting();
325	float r = m_gl->devicePixelRatio();
326	m_backend->resized(m_backend, m_size.width() * r, m_size.height() * r);
327	m_backend->drawFrame(m_backend);
328	m_painter.endNativePainting();
329	if (m_messagePainter) {
330		m_messagePainter->paint(&m_painter);
331	}
332}
333
334void PainterGL::enqueue(const uint32_t* backing) {
335	m_mutex.lock();
336	uint32_t* buffer;
337	if (m_free.isEmpty()) {
338		buffer = m_queue.dequeue();
339	} else {
340		buffer = m_free.takeLast();
341	}
342	memcpy(buffer, backing, 256 * VIDEO_VERTICAL_PIXELS * BYTES_PER_PIXEL);
343	m_queue.enqueue(buffer);
344	m_mutex.unlock();
345}
346
347void PainterGL::dequeue() {
348	m_mutex.lock();
349	if (m_queue.isEmpty()) {
350		m_mutex.unlock();
351		return;
352	}
353	uint32_t* buffer = m_queue.dequeue();
354	m_backend->postFrame(m_backend, buffer);
355	m_free.append(buffer);
356	m_mutex.unlock();
357}
358
359void PainterGL::dequeueAll() {
360	uint32_t* buffer = 0;
361	m_mutex.lock();
362	while (!m_queue.isEmpty()) {
363		buffer = m_queue.dequeue();
364		m_free.append(buffer);
365	}
366	if (buffer) {
367		m_backend->postFrame(m_backend, buffer);
368	}
369	m_mutex.unlock();
370}
371
372void PainterGL::setShaders(struct VDir* dir) {
373	if (!supportsShaders()) {
374		return;
375	}
376#if !defined(_WIN32) || defined(USE_EPOXY)
377	m_gl->makeCurrent();
378#if defined(_WIN32) && defined(USE_EPOXY)
379	epoxy_handle_external_wglMakeCurrent();
380#endif
381	if (m_shader.passes) {
382		GBAGLES2ShaderDetach(reinterpret_cast<GBAGLES2Context*>(m_backend));
383		GBAGLES2ShaderFree(&m_shader);
384	}
385	GBAGLES2ShaderLoad(&m_shader, dir);
386	if (m_started) {
387		GBAGLES2ShaderAttach(reinterpret_cast<GBAGLES2Context*>(m_backend), static_cast<GBAGLES2Shader*>(m_shader.passes), m_shader.nPasses);
388	}
389	m_gl->doneCurrent();
390#endif
391}
392
393VideoShader* PainterGL::shaders() {
394	return &m_shader;
395}