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->setGLContext(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();
 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::initializeGL() {
 60	glClearColor(0, 0, 0, 0);
 61	glClear(GL_COLOR_BUFFER_BIT);
 62	swapBuffers();
 63}
 64
 65void Display::resizeEvent(QResizeEvent* event) {
 66	if (m_painter) {
 67		m_painter->resize(event->size());
 68	}
 69}
 70
 71Painter::Painter(Display* parent) {
 72	m_size = parent->size();
 73}
 74
 75void Painter::setContext(GBAThread* context) {
 76	m_context = context;
 77}
 78
 79void Painter::setBacking(const uint32_t* backing) {
 80	m_backing = backing;
 81}
 82
 83void Painter::setGLContext(QGLWidget* context) {
 84	m_gl = context;
 85}
 86
 87void Painter::resize(const QSize& size) {
 88	m_size = size;
 89}
 90
 91void Painter::start() {
 92	m_gl->makeCurrent();
 93	glEnable(GL_TEXTURE_2D);
 94	glGenTextures(1, &m_tex);
 95	glBindTexture(GL_TEXTURE_2D, m_tex);
 96	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 97	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 98	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 99	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
100	glEnableClientState(GL_VERTEX_ARRAY);
101	glVertexPointer(2, GL_INT, 0, _glVertices);
102	glTexCoordPointer(2, GL_INT, 0, _glTexCoords);
103	glMatrixMode(GL_PROJECTION);
104	glLoadIdentity();
105	glOrtho(0, 240, 160, 0, 0, 1);
106	glMatrixMode(GL_MODELVIEW);
107	glLoadIdentity();
108	m_gl->doneCurrent();
109
110	m_drawTimer = new QTimer;
111	m_drawTimer->moveToThread(QThread::currentThread());
112	m_drawTimer->setInterval(0);
113	connect(m_drawTimer, SIGNAL(timeout()), this, SLOT(draw()));
114	m_drawTimer->start();
115}
116
117void Painter::draw() {
118	m_gl->makeCurrent();
119	if (GBASyncWaitFrameStart(&m_context->sync, m_context->frameskip)) {
120		glViewport(0, 0, m_size.width() * m_gl->devicePixelRatio(), m_size.height() * m_gl->devicePixelRatio());
121		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, m_backing);
122		glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
123		if (m_context->sync.videoFrameWait) {
124			glFlush();
125		}
126	}
127	GBASyncWaitFrameEnd(&m_context->sync);
128	m_gl->swapBuffers();
129	m_gl->doneCurrent();
130}
131
132void Painter::stop() {
133	m_drawTimer->stop();
134	delete m_drawTimer;
135	m_gl->makeCurrent();
136	glDeleteTextures(1, &m_tex);
137	glClear(GL_COLOR_BUFFER_BIT);
138	m_gl->swapBuffers();
139	m_gl->doneCurrent();
140	m_gl->context()->moveToThread(QApplication::instance()->thread());
141}