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(QWidget* parent)
 27	: QGLWidget(QGLFormat(QGL::Rgba | QGL::SingleBuffer), parent)
 28	, m_painter(nullptr)
 29	, m_drawThread(nullptr)
 30{
 31	setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
 32	setAutoBufferSwap(false);
 33}
 34
 35void Display::startDrawing(const uint32_t* buffer, GBAThread* thread) {
 36	if (m_drawThread) {
 37		return;
 38	}
 39	m_drawThread = new QThread(this);
 40	m_painter = new Painter(this);
 41	m_painter->setContext(thread);
 42	m_painter->setBacking(buffer);
 43	m_painter->moveToThread(m_drawThread);
 44	doneCurrent();
 45	context()->moveToThread(m_drawThread);
 46	connect(m_drawThread, SIGNAL(started()), m_painter, SLOT(start()));
 47	m_drawThread->start(QThread::TimeCriticalPriority);
 48}
 49
 50void Display::stopDrawing() {
 51	if (m_drawThread) {
 52		QMetaObject::invokeMethod(m_painter, "stop", Qt::BlockingQueuedConnection);
 53		m_drawThread->exit();
 54		m_drawThread = nullptr;
 55	}
 56}
 57
 58void Display::initializeGL() {
 59	glClearColor(0, 0, 0, 0);
 60	glClear(GL_COLOR_BUFFER_BIT);
 61	swapBuffers();
 62}
 63
 64void Display::resizeEvent(QResizeEvent* event) {
 65	if (m_painter) {
 66		QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, event->size()));
 67	}
 68}
 69
 70Painter::Painter(Display* parent)
 71	: m_gl(parent)
 72{
 73	m_size = parent->size();
 74}
 75
 76void Painter::setContext(GBAThread* context) {
 77	m_context = context;
 78}
 79
 80void Painter::setBacking(const uint32_t* backing) {
 81	m_backing = backing;
 82}
 83
 84void Painter::resize(const QSize& size) {
 85	m_size = size;
 86	m_gl->makeCurrent();
 87	glViewport(0, 0, m_size.width() * m_gl->devicePixelRatio(), m_size.height() * m_gl->devicePixelRatio());
 88	glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 89	m_gl->swapBuffers();
 90	m_gl->doneCurrent();
 91}
 92
 93void Painter::start() {
 94	m_gl->makeCurrent();
 95	glEnable(GL_TEXTURE_2D);
 96	glGenTextures(1, &m_tex);
 97	glBindTexture(GL_TEXTURE_2D, m_tex);
 98	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 99	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
100	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
101	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
102	glEnableClientState(GL_VERTEX_ARRAY);
103	glVertexPointer(2, GL_INT, 0, _glVertices);
104	glTexCoordPointer(2, GL_INT, 0, _glTexCoords);
105	glMatrixMode(GL_PROJECTION);
106	glLoadIdentity();
107	glOrtho(0, 240, 160, 0, 0, 1);
108	glMatrixMode(GL_MODELVIEW);
109	glLoadIdentity();
110	m_gl->doneCurrent();
111
112	m_drawTimer = new QTimer;
113	m_drawTimer->moveToThread(QThread::currentThread());
114	m_drawTimer->setInterval(0);
115	connect(m_drawTimer, SIGNAL(timeout()), this, SLOT(draw()));
116	m_drawTimer->start();
117}
118
119void Painter::draw() {
120	m_gl->makeCurrent();
121	if (GBASyncWaitFrameStart(&m_context->sync, m_context->frameskip)) {
122		glViewport(0, 0, m_size.width() * m_gl->devicePixelRatio(), m_size.height() * m_gl->devicePixelRatio());
123		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, m_backing);
124		glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
125		if (m_context->sync.videoFrameWait) {
126			glFlush();
127		}
128	}
129	GBASyncWaitFrameEnd(&m_context->sync);
130	m_gl->swapBuffers();
131	m_gl->doneCurrent();
132}
133
134void Painter::stop() {
135	m_drawTimer->stop();
136	delete m_drawTimer;
137	m_gl->makeCurrent();
138	glDeleteTextures(1, &m_tex);
139	glClear(GL_COLOR_BUFFER_BIT);
140	m_gl->swapBuffers();
141	m_gl->doneCurrent();
142	m_gl->context()->moveToThread(QApplication::instance()->thread());
143}