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window.cpp
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window.cpp
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#include <QCoreApplication>
#include <QDebug>
#include <QString>
#include <QOpenGLShaderProgram>
#include <QOpenGLTexture>
#include <QExposeEvent>
#include <QImage>
#include <QImageWriter>
#include "glm/glm.hpp"
#include "glm/ext.hpp"
//#include "input.h"
#include "window.h"
#include "vertex.h"
#include "cuda_utils.h"
extern void mandelbrot(void *devPtr, int w, int h, double cx, double cy, double zoom, int iter, bool double_prec);
// Create a colored single fullscreen triangle
// 3*______________
// |\_____________
// | \____________
// 2* \___________
// | \__________
// | \_________
// 1*--*--*________
// |.....|\_______
// |.....| \______
// 0*..*..* \_____
// |.....| \____
// |.....| \___
//-1*--*--*--*--*__
// -1 0 1 2 3 x position coords
// 0 1 2 s texture coords
static const Vertex sg_vertexes[] = {
Vertex( QVector3D(-1.0f, 3.0f, -1.0f), QVector3D(0.0f, 2.0f, 0.0f) ),
Vertex( QVector3D(-1.0f, -1.0f, -1.0f), QVector3D(0.0f, 0.0f, 1.0f) ),
Vertex( QVector3D( 3.0f, -1.0f, -1.0f), QVector3D(2.0f, 0.0f, 0.0f) )
};
Window::Window()
{
m_shared_width = m_shared_height = 2048;
m_center_x = 0.0;
m_center_y = 0.0;
m_zoom = 0.5;
m_switch_fullscreen = false;
m_is_full_screen = false;
m_zoom_out_mode = false;
m_iter = 1;
m_double_precision = true;
m_quit = false;
m_mouse_down = false;
m_pixels = nullptr;
m_save_image = false;
}
Window::~Window()
{
makeCurrent();
teardownGL();
}
// ======================================================================
// public
// ======================================================================
void Window::initializeGL()
{
// Initialize OpenGL Backend
initializeOpenGLFunctions();
connect(this, SIGNAL(frameSwapped()), this, SLOT(update()));
printInfo();
// Set global information
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
// OpenGL initialization
{
// Create Shader (Do not release until VAO is created)
m_program = new QOpenGLShaderProgram();
m_program->addShaderFromSourceFile(QOpenGLShader::Vertex, ":/shaders/basic_vert.glsl");
m_program->addShaderFromSourceFile(QOpenGLShader::Fragment, ":/shaders/basic_frag.glsl");
m_program->link();
m_program->bind();
// Bind uniforms
u_cameraToView = m_program->uniformLocation("cameraToView");
// Create Buffer (Do not release until VAO is created)
m_vertex.create();
m_vertex.bind();
m_vertex.setUsagePattern(QOpenGLBuffer::StaticDraw);
m_vertex.allocate(sg_vertexes, sizeof(sg_vertexes));
// Create Vertex Array Object
m_object.create();
m_object.bind();
m_program->enableAttributeArray(0);
m_program->enableAttributeArray(1);
m_program->setAttributeBuffer(0, GL_FLOAT, Vertex::positionOffset(), Vertex::PositionTupleSize, Vertex::stride());
m_program->setAttributeBuffer(1, GL_FLOAT, Vertex::colorOffset(), Vertex::ColorTupleSize, Vertex::stride());
// Release (unbind) all
m_object.release();
m_vertex.release();
m_program->release();
// Load texture (not used anymore FIXME?)
m_texture = new QOpenGLTexture(QImage(QString(":/images/side1.png")).mirrored());
// Shared OpenGL & CUDA buffer
// Generate a buffer ID
glGenBuffers(1,&m_shared_pbo_id);
// Make this the current UNPACK buffer aka PBO (Pixel Buffer Object)
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, m_shared_pbo_id);
// Allocate data for the buffer
glBufferData(GL_PIXEL_UNPACK_BUFFER, m_shared_width * m_shared_height * 4, nullptr, GL_DYNAMIC_COPY);
// Create a GL Texture
glEnable(GL_TEXTURE_2D);
glGenTextures(1,&m_shared_tex_id);
glBindTexture(GL_TEXTURE_2D, m_shared_tex_id);
// Allocate the texture memory.
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA8, m_shared_width, m_shared_height, 0, GL_BGRA, GL_UNSIGNED_BYTE, nullptr);
// Set filter mode
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
}
// CUDA initialization
{
cuda_init();
m_cuda_pbo_handle = cuda_register_buffer(m_shared_pbo_id);
}
}
// keep the longest side (-1,1) and keep centered around 0,0 origin.
void Window::resizeGL(int width, int height)
{
m_window_width = width;
m_window_height = height;
float aspect = float(width)/float(height);
if (width >= height) {
// aspect >= 1, set the width to -1 to 1, with larger height
m_projection = glm::ortho(-1.0f, 1.0f, -1.0f / aspect, 1.0f / aspect);
} else {
// aspect < 1, set the height from -1 to 1, with larger width
m_projection = glm::ortho(-1.0f * aspect, 1.0f * aspect, -1.0f, 1.0f);
}
// resize rgb array for saving pixels
if(m_pixels != nullptr) {
delete[](m_pixels);
}
m_pixels = new unsigned char[m_window_width * m_window_height * 4];
printf("m_pixels size = %d\n",m_window_width * m_window_height * 4);
}
void Window::paintGL()
{
// Clear
glClear(GL_COLOR_BUFFER_BIT);
// Do some CUDA that writes to the pbo
void *devPtr = cuda_map_resource(m_cuda_pbo_handle);
mandelbrot(devPtr, m_shared_width, m_shared_height, m_center_x, m_center_y, m_zoom, m_iter, m_double_precision);
cuda_unmap_resource(m_cuda_pbo_handle);
// Render using our shader
m_program->bind();
m_program->setUniformValue(u_cameraToView, QMatrix4x4(glm::value_ptr(m_projection)));
{
m_object.bind();
// the equivalent of:
// m_texture->bind();
// connect the pbo to the texture
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, m_shared_pbo_id);
glBindTexture(GL_TEXTURE_2D, m_shared_tex_id);
// Since source parameter is NULL, Data is coming from a PBO, not host memory
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, m_shared_width, m_shared_height, GL_BGRA, GL_UNSIGNED_BYTE, nullptr);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
glDrawArrays(GL_TRIANGLES, 0, sizeof(sg_vertexes) / sizeof(sg_vertexes[0]));
m_object.release();
}
m_program->release();
}
void Window::teardownGL()
{
// Destroy our CUDA info
cuda_unregister_resource(m_cuda_pbo_handle);
// Destroy our OpenGL information
m_object.destroy();
m_vertex.destroy();
delete m_program;
delete m_texture;
}
// ======================================================================
// protected
// ======================================================================
void Window::update()
{
// Update input
//Input::update();
if (m_quit) {
QCoreApplication::quit();
}
else if (m_switch_fullscreen) {
m_switch_fullscreen = false;
if (m_is_full_screen) {
showNormal();
m_is_full_screen = false;
} else {
showFullScreen();
m_is_full_screen = true;
}
}
if(m_zoom_out_mode) {
m_zoom /= 1.1;
if(m_zoom < 0.5) {
m_zoom_out_mode = false;
}
}
if (m_mouse_down) {
QPoint delta_pos = QCursor::pos() - m_mouse_start;
double pixels_per_mspace = (m_window_width > m_window_height) ? double(m_window_width)*m_zoom : double(m_window_height)*m_zoom;
double mspace_per_pixel = 2.0/pixels_per_mspace;
double center_delta_x = double(delta_pos.x())*mspace_per_pixel;
double center_delta_y = double(delta_pos.y())*mspace_per_pixel;
m_center_x = m_center_start_x - center_delta_x;
m_center_y = m_center_start_y + center_delta_y;
}
QOpenGLWindow::update();
if(m_save_image) {
printf("write save.png\n");
m_save_image = false;
glReadPixels(0, 0, m_window_width, m_window_height, GL_RGBA, GL_UNSIGNED_BYTE, m_pixels);
QImageWriter *imw = new QImageWriter();
imw->setFileName("save.png");
QImage *im = new QImage((const unsigned char *)m_pixels, m_window_width, m_window_height, QImage::Format_RGBA8888);
imw->write(im->mirrored());
}
}
void Window::keyPressEvent(QKeyEvent *event)
{
if (event->isAutoRepeat()) {
event->ignore();
}
else {
switch(event->key()) {
case Qt::Key_Escape:
m_quit = true;
break;
case Qt::Key_D:
m_double_precision = true;
break;
case Qt::Key_S:
m_double_precision = false;
break;
case Qt::Key_F:
m_switch_fullscreen = true;
break;
case Qt::Key_Return:
m_zoom_out_mode = true;
break;
case Qt::Key_1:
m_iter = 1;
break;
case Qt::Key_2:
m_iter = 2;
break;
case Qt::Key_3:
m_iter = 3;
break;
case Qt::Key_4:
m_iter = 4;
break;
case Qt::Key_P:
printf("Center = %g,%g Zoom = %g\n",m_center_x,m_center_y,m_zoom);
break;
case Qt::Key_W:
m_save_image = true;
break;
default:
break;
}
//Input::registerKeyPress(event->key());
}
}
void Window::keyReleaseEvent(QKeyEvent *event)
{
if (event->isAutoRepeat()) {
event->ignore();
}
else {
//Input::registerKeyRelease(event->key());
}
}
void Window::mousePressEvent(QMouseEvent *event)
{
if(event->button() == Qt::LeftButton) {
m_mouse_start = QCursor::pos();
m_center_start_x = m_center_x;
m_center_start_y = m_center_y;
m_mouse_down = true;
}
//Input::registerMousePress(event->button());
}
void Window::mouseReleaseEvent(QMouseEvent *event)
{
if(event->button() == Qt::LeftButton) {
m_mouse_down = false;
}
//Input::registerMouseRelease(event->button());
}
void Window::wheelEvent(QWheelEvent *event)
{
if(event->delta() > 0) {
m_zoom *= 1.1;
}
else {
m_zoom /= 1.1;
}
printf("zoom=%g\n",m_zoom);
}
// ======================================================================
// private
// ======================================================================
void Window::printInfo()
{
QString glType;
QString glVersion;
QString glProfile;
// Get Version Information
glType = (context()->isOpenGLES()) ? "OpenGL ES" : "OpenGL";
glVersion = reinterpret_cast<const char*>(glGetString(GL_VERSION));
// Get Profile Information
#define CASE(c) case QSurfaceFormat::c: glProfile = #c; break
switch (format().profile())
{
CASE(NoProfile);
CASE(CoreProfile);
CASE(CompatibilityProfile);
}
#undef CASE
// qPrintable() will print our QString w/o quotes around it.
qDebug() << qPrintable(glType) << qPrintable(glVersion) << "(" << qPrintable(glProfile) << ")";
}