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	if (m_drawThread) {
152		QMetaObject::invokeMethod(m_painter, "setShaders", Qt::BlockingQueuedConnection, Q_ARG(struct VDir*, shaders));
153	} else {
154		m_painter->setShaders(shaders);
155	}
156}
157
158void DisplayGL::clearShaders() {
159	QMetaObject::invokeMethod(m_painter, "clearShaders");
160}
161
162void DisplayGL::resizeEvent(QResizeEvent* event) {
163	Display::resizeEvent(event);
164	resizePainter();
165}
166
167void DisplayGL::resizePainter() {
168	m_gl->resize(size());
169	if (m_drawThread) {
170		QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, size()));
171	}
172}
173
174PainterGL::PainterGL(QGLWidget* parent, QGLFormat::OpenGLVersionFlags glVersion)
175	: m_gl(parent)
176	, m_active(false)
177	, m_started(false)
178	, m_context(nullptr)
179	, m_shader{}
180	, m_backend(nullptr)
181	, m_messagePainter(nullptr)
182{
183#ifdef BUILD_GL
184	GBAGLContext* glBackend;
185#endif
186#if !defined(_WIN32) || defined(USE_EPOXY)
187	GBAGLES2Context* gl2Backend;
188#endif
189
190#if !defined(_WIN32) || defined(USE_EPOXY)
191	if (glVersion & QGLFormat::OpenGL_Version_3_0) {
192		gl2Backend = new GBAGLES2Context;
193		GBAGLES2ContextCreate(gl2Backend);
194		m_backend = &gl2Backend->d;
195		m_supportsShaders = true;
196	}
197#endif
198
199#ifdef BUILD_GL
200	 if (!m_backend) {
201		glBackend = new GBAGLContext;
202		GBAGLContextCreate(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<GBAGLES2Context*>(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 * 256]);
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#if !defined(_WIN32) || defined(USE_EPOXY)
241	if (m_shader.passes) {
242		GBAGLES2ShaderFree(&m_shader);
243	}
244#endif
245	m_backend->deinit(m_backend);
246	delete m_backend;
247	m_backend = nullptr;
248}
249
250void PainterGL::setContext(GBAThread* context) {
251	m_context = context;
252}
253
254void PainterGL::setMessagePainter(MessagePainter* messagePainter) {
255	m_messagePainter = messagePainter;
256}
257
258void PainterGL::resize(const QSize& size) {
259	m_size = size;
260	if (m_started && !m_active) {
261		forceDraw();
262	}
263}
264
265void PainterGL::lockAspectRatio(bool lock) {
266	m_backend->lockAspectRatio = lock;
267	if (m_started && !m_active) {
268		forceDraw();
269	}
270}
271
272void PainterGL::filter(bool filter) {
273	m_backend->filter = filter;
274	if (m_started && !m_active) {
275		forceDraw();
276	}
277}
278
279void PainterGL::start() {
280	m_gl->makeCurrent();
281#if defined(_WIN32) && defined(USE_EPOXY)
282	epoxy_handle_external_wglMakeCurrent();
283#endif
284
285#if !defined(_WIN32) || defined(USE_EPOXY)
286	if (m_supportsShaders && m_shader.passes) {
287		GBAGLES2ShaderAttach(reinterpret_cast<GBAGLES2Context*>(m_backend), static_cast<GBAGLES2Shader*>(m_shader.passes), m_shader.nPasses);
288	}
289#endif
290
291	m_gl->doneCurrent();
292	m_active = true;
293	m_started = true;
294}
295
296void PainterGL::draw() {
297	if (m_queue.isEmpty() || !GBAThreadIsActive(m_context)) {
298		return;
299	}
300	if (GBASyncWaitFrameStart(&m_context->sync) || !m_queue.isEmpty()) {
301		dequeue();
302		GBASyncWaitFrameEnd(&m_context->sync);
303		m_painter.begin(m_gl->context()->device());
304		performDraw();
305		m_painter.end();
306		m_backend->swap(m_backend);
307	} else {
308		GBASyncWaitFrameEnd(&m_context->sync);
309	}
310	if (!m_queue.isEmpty()) {
311		QMetaObject::invokeMethod(this, "draw", Qt::QueuedConnection);
312	}
313}
314
315void PainterGL::forceDraw() {
316	m_painter.begin(m_gl->context()->device());
317	performDraw();
318	m_painter.end();
319	m_backend->swap(m_backend);
320}
321
322void PainterGL::stop() {
323	m_active = false;
324	m_started = false;
325	m_gl->makeCurrent();
326#if defined(_WIN32) && defined(USE_EPOXY)
327	epoxy_handle_external_wglMakeCurrent();
328#endif
329	dequeueAll();
330	m_backend->clear(m_backend);
331	m_backend->swap(m_backend);
332	m_gl->doneCurrent();
333	m_gl->context()->moveToThread(m_gl->thread());
334	moveToThread(m_gl->thread());
335}
336
337void PainterGL::pause() {
338	m_active = false;
339}
340
341void PainterGL::unpause() {
342	m_active = true;
343}
344
345void PainterGL::performDraw() {
346	m_painter.beginNativePainting();
347	float r = m_gl->devicePixelRatio();
348	m_backend->resized(m_backend, m_size.width() * r, m_size.height() * r);
349	m_backend->drawFrame(m_backend);
350	m_painter.endNativePainting();
351	if (m_messagePainter) {
352		m_messagePainter->paint(&m_painter);
353	}
354}
355
356void PainterGL::enqueue(const uint32_t* backing) {
357	m_mutex.lock();
358	uint32_t* buffer;
359	if (m_free.isEmpty()) {
360		buffer = m_queue.dequeue();
361	} else {
362		buffer = m_free.takeLast();
363	}
364	memcpy(buffer, backing, 256 * VIDEO_VERTICAL_PIXELS * BYTES_PER_PIXEL);
365	m_queue.enqueue(buffer);
366	m_mutex.unlock();
367}
368
369void PainterGL::dequeue() {
370	m_mutex.lock();
371	if (m_queue.isEmpty()) {
372		m_mutex.unlock();
373		return;
374	}
375	uint32_t* buffer = m_queue.dequeue();
376	m_backend->postFrame(m_backend, buffer);
377	m_free.append(buffer);
378	m_mutex.unlock();
379}
380
381void PainterGL::dequeueAll() {
382	uint32_t* buffer = 0;
383	m_mutex.lock();
384	while (!m_queue.isEmpty()) {
385		buffer = m_queue.dequeue();
386		m_free.append(buffer);
387	}
388	if (buffer) {
389		m_backend->postFrame(m_backend, buffer);
390	}
391	m_mutex.unlock();
392}
393
394void PainterGL::setShaders(struct VDir* dir) {
395	if (!supportsShaders()) {
396		return;
397	}
398#if !defined(_WIN32) || defined(USE_EPOXY)
399	m_gl->makeCurrent();
400#if defined(_WIN32) && defined(USE_EPOXY)
401	epoxy_handle_external_wglMakeCurrent();
402#endif
403	if (m_shader.passes) {
404		GBAGLES2ShaderDetach(reinterpret_cast<GBAGLES2Context*>(m_backend));
405		GBAGLES2ShaderFree(&m_shader);
406	}
407	GBAGLES2ShaderLoad(&m_shader, dir);
408	if (m_started) {
409		GBAGLES2ShaderAttach(reinterpret_cast<GBAGLES2Context*>(m_backend), static_cast<GBAGLES2Shader*>(m_shader.passes), m_shader.nPasses);
410	}
411	m_gl->doneCurrent();
412#endif
413}
414
415void PainterGL::clearShaders() {
416	if (!supportsShaders()) {
417		return;
418	}
419#if !defined(_WIN32) || defined(USE_EPOXY)
420	m_gl->makeCurrent();
421#if defined(_WIN32) && defined(USE_EPOXY)
422	epoxy_handle_external_wglMakeCurrent();
423#endif
424	if (m_shader.passes) {
425		GBAGLES2ShaderDetach(reinterpret_cast<GBAGLES2Context*>(m_backend));
426		GBAGLES2ShaderFree(&m_shader);
427	}
428	m_gl->doneCurrent();
429#endif
430}
431
432VideoShader* PainterGL::shaders() {
433	return &m_shader;
434}