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interleaved rendering balances the load better

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This commit is contained in:
Benoit Jacob 2008-07-01 14:12:32 +00:00
parent 56d03f181e
commit a356ebd47d
2 changed files with 4 additions and 6 deletions
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9
demos/mandelbrot/mandelbrot.cpp
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@ -29,13 +29,13 @@ template<typename Real> void MandelbrotThread::render(int img_width, int img_hei
unsigned char *const buffer = widget->buffer;
const double xradius = widget->xradius;
const double yradius = xradius * img_height / img_width;
const int threadcount = widget->threadcount;
typedef Eigen::Matrix<Real, 2, 1> Vector2;
Vector2 start(widget->center.x() - widget->xradius, widget->center.y() - yradius);
Vector2 step(2*widget->xradius/img_width, 2*yradius/img_height);
total_iter = 0;
int slice_height = img_height / widget->threadcount;
for(int y = id * slice_height; y < (id+1) * slice_height; y++)
for(int y = id; y < img_height; y += threadcount)
{
int pix = y * img_width;
@ -78,7 +78,6 @@ template<typename Real> void MandelbrotThread::render(int img_width, int img_hei
// compute pixel colors
for(int i = 0; i < packetSize; i++)
{
buffer[4*(pix+i)] = 255*pix_iter[i]/max_iter;
buffer[4*(pix+i)+1] = 0;
buffer[4*(pix+i)+2] = 0;
@ -135,8 +134,8 @@ void MandelbrotWidget::paintEvent(QPaintEvent *)
? int(Eigen::ei_packet_traits<float>::size)
: int(Eigen::ei_packet_traits<double>::size);
setWindowTitle(QString("resolution ")+QString::number(xradius*2/width(), 'e', 2)
+QString(", up to %1 iterations").arg(threads[0]->max_iter)
+(threads[0]->single_precision ? QString(", single ") : QString(", double "))
+QString(", %1 iterations per pixel, ").arg(threads[0]->max_iter)
+(threads[0]->single_precision ? QString("single ") : QString("double "))
+QString("precision, ")
+(packetSize==1 ? QString("no vectorization")
: QString("vectorized (%1 per packet)").arg(packetSize)));

1
demos/mandelbrot/mandelbrot.h
View File

@ -41,7 +41,6 @@ class MandelbrotWidget : public QWidget
void paintEvent(QPaintEvent *);
void mousePressEvent(QMouseEvent *event);
void mouseMoveEvent(QMouseEvent *event);
template<typename Real> int render(int max_iter, int resx, int resy);
public:
MandelbrotWidget() : QWidget(), center(0,0), xradius(2),