1#include "Display.h"
  2
  3#include <QApplication>
  4#include <QResizeEvent>
  5
  6extern "C" {
  7#include "gba-thread.h"
  8}
  9
 10using namespace QGBA;
 11
 12static const GLint _glVertices[] = {
 13	0, 0,
 14	256, 0,
 15	256, 256,
 16	0, 256
 17};
 18
 19static const GLint _glTexCoords[] = {
 20	0, 0,
 21	1, 0,
 22	1, 1,
 23	0, 1
 24};
 25
 26Display::Display(QGLFormat format, QWidget* parent)
 27	: QGLWidget(format, parent)
 28	, m_painter(nullptr)
 29	, m_drawThread(nullptr)
 30{
 31	setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
 32	setMinimumSize(VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS);
 33	setAutoBufferSwap(false);
 34}
 35
 36void Display::startDrawing(const uint32_t* buffer, GBAThread* thread) {
 37	if (m_drawThread) {
 38		return;
 39	}
 40	m_drawThread = new QThread(this);
 41	m_painter = new Painter(this);
 42	m_painter->setContext(thread);
 43	m_painter->setBacking(buffer);
 44	m_painter->moveToThread(m_drawThread);
 45	doneCurrent();
 46	context()->moveToThread(m_drawThread);
 47	connect(m_drawThread, SIGNAL(started()), m_painter, SLOT(start()));
 48	m_drawThread->start(QThread::TimeCriticalPriority);
 49}
 50
 51void Display::stopDrawing() {
 52	if (m_drawThread) {
 53		QMetaObject::invokeMethod(m_painter, "stop", Qt::BlockingQueuedConnection);
 54		m_drawThread->exit();
 55		m_drawThread = nullptr;
 56	}
 57}
 58
 59void Display::forceDraw() {
 60	if (m_drawThread) {
 61		QMetaObject::invokeMethod(m_painter, "forceDraw", Qt::QueuedConnection);
 62	}
 63}
 64
 65void Display::initializeGL() {
 66	glClearColor(0, 0, 0, 0);
 67	glClear(GL_COLOR_BUFFER_BIT);
 68	swapBuffers();
 69}
 70
 71void Display::resizeEvent(QResizeEvent* event) {
 72	if (m_drawThread) {
 73		QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, event->size()));
 74	}
 75}
 76
 77Painter::Painter(Display* parent)
 78	: m_gl(parent)
 79{
 80	m_size = parent->size();
 81}
 82
 83void Painter::setContext(GBAThread* context) {
 84	m_context = context;
 85}
 86
 87void Painter::setBacking(const uint32_t* backing) {
 88	m_backing = backing;
 89}
 90
 91void Painter::resize(const QSize& size) {
 92	m_size = size;
 93	m_gl->makeCurrent();
 94	glViewport(0, 0, m_size.width() * m_gl->devicePixelRatio(), m_size.height() * m_gl->devicePixelRatio());
 95	glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 96	m_gl->swapBuffers();
 97	m_gl->doneCurrent();
 98}
 99
100void Painter::start() {
101	m_gl->makeCurrent();
102	glEnable(GL_TEXTURE_2D);
103	glGenTextures(1, &m_tex);
104	glBindTexture(GL_TEXTURE_2D, m_tex);
105	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
106	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
107	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
108	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
109	glEnableClientState(GL_VERTEX_ARRAY);
110	glVertexPointer(2, GL_INT, 0, _glVertices);
111	glTexCoordPointer(2, GL_INT, 0, _glTexCoords);
112	glMatrixMode(GL_PROJECTION);
113	glLoadIdentity();
114	glOrtho(0, 240, 160, 0, 0, 1);
115	glMatrixMode(GL_MODELVIEW);
116	glLoadIdentity();
117	m_gl->doneCurrent();
118
119	m_drawTimer = new QTimer;
120	m_drawTimer->moveToThread(QThread::currentThread());
121	m_drawTimer->setInterval(0);
122	connect(m_drawTimer, SIGNAL(timeout()), this, SLOT(draw()));
123	m_drawTimer->start();
124}
125
126void Painter::draw() {
127	m_gl->makeCurrent();
128	if (GBASyncWaitFrameStart(&m_context->sync, m_context->frameskip)) {
129		glViewport(0, 0, m_size.width() * m_gl->devicePixelRatio(), m_size.height() * m_gl->devicePixelRatio());
130		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, m_backing);
131		glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
132		if (m_context->sync.videoFrameWait) {
133			glFlush();
134		}
135	}
136	GBASyncWaitFrameEnd(&m_context->sync);
137	m_gl->swapBuffers();
138	m_gl->doneCurrent();
139}
140
141void Painter::forceDraw() {
142	m_gl->makeCurrent();
143	glViewport(0, 0, m_size.width() * m_gl->devicePixelRatio(), m_size.height() * m_gl->devicePixelRatio());
144	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, m_backing);
145	glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
146	if (m_context->sync.videoFrameWait) {
147		glFlush();
148	}
149	m_gl->swapBuffers();
150	m_gl->doneCurrent();
151}
152
153void Painter::stop() {
154	m_drawTimer->stop();
155	delete m_drawTimer;
156	m_gl->makeCurrent();
157	glDeleteTextures(1, &m_tex);
158	glClear(GL_COLOR_BUFFER_BIT);
159	m_gl->swapBuffers();
160	m_gl->doneCurrent();
161	m_gl->context()->moveToThread(QApplication::instance()->thread());
162}