void ddaLine(int x1, int y1, int x2, int y2)
{
float x,y,xInc,yInc,dx,dy;
int next;
dx = x2 - x1;
dy = y2 - y1;
if(abs(dx)>abs(dy))
next=abs(dx);
else
next=abs(dy);
xInc = dx / next;
yInc = dy / next;
x = x1;
y = y1;
renderPixel(x,y);
for(int i=1;i<=next;i++)
{
x = x + xInc;
y = y + yInc;
renderPixel(x,y);
}
}
void ddaCircle(int x0, int y0, int r)
{
int x = r, y = 0;
int radiusError = 1-x;
while(x >= y)
{
renderPixel(x + x0, y + y0); //1st octant
renderPixel(y + x0, x + y0); //2nd octant
renderPixel(-x + x0, y + y0); //4th octant
renderPixel(-y + x0, x + y0); //3rd octant
renderPixel(-x + x0, -y + y0); //5th octant
renderPixel(-y + x0, -x + y0); //6th octant
renderPixel(x + x0, -y + y0); //8th octant
renderPixel(y + x0, -x + y0); //7th octant
y++;
if(radiusError<0)
radiusError+=2*y+1;
else
{
x--;
radiusError+=2*(y-x+1);
}
}
}
void Rasterizer::RenderPixelsOMP()
{
int size = pow(m_renderingParams->size(),2);
float delta = 1.0/(float)size;
m_percentDone = 0;
int boxSize = min(m_renderingParams->size()/60, 4);
if (m_isPreview)
boxSize = 1;
// boxSize = 1;
#pragma omp parallel for
for (int k=0;k<size;k++) {
if (m_abort)
continue;
int idx = m_renderList[ k ];
QVector3D dir = setupCamera(idx);
RasterPixel rp = renderPixel(dir, m_galaxies);
m_percentDone+=delta;
int i = idx%(int)m_renderingParams->size();
int j = (idx-i)/(int)m_renderingParams->size();
m_renderBuffer->DrawBox(m_backBuffer, i,j, boxSize, rp.I());
}
m_abort = false;
}
void GL_render()
{
glClear(GL_COLOR_BUFFER_BIT);
renderPixel(400,400);
ddaLine(200,300,235,400);
ddaLine(400,500,500,600);
ddaLine(300,100,600,110);
ddaCircle(400,400,300);
glutSwapBuffers();
}
QImage* Scene::render()
{
QImage* image = new QImage( m_Xresolution,
m_Yresolution,
QImage::Format_RGB888 );
for ( qreal y = 0; y < m_Yresolution; ++y )
{
for ( qreal x = 0; x < m_Xresolution; ++x )
{
renderPixel( image, x, y );
}
}
return image;
}
void Raytracer::renderTile(int x0, int x1, int y0, int y1, const osg::Vec3f& eye, const osg::Matrix& projToWorld)
{
for (int y = y0; y < y1;++y)
{
for (int x = x0; x < x1;++x)
{
osg::Vec3f p(2.0f * x /(float)_width - 1.0f, 2 * y / (float)_height - 1.0f, 1);
osg::Vec3f dir = (p*projToWorld) - eye;
dir.normalize();
osg::Vec4f color = renderPixel(x,y, eye, dir);
common::setColor(_framebuffer,osg::Vec2f(x,y),color);
}
}
}
