Widget::Widget(QGLWidget *parent): QGLWidget(QGLFormat(QGL::DoubleBuffer), parent){
}


void Widget::initializeGL(){
	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	glEnable(GL_TEXTURE_2D);
	glHint(GL_POLYGON_SMOOTH_HINT, GL_FASTEST);
	glClearColor(1, 1, 1, 1);

	timer.start(16, this);
}

void Widget::timerEvent(QTimerEvent *){
	time.start();
	updateGL();//8-12мс
	//paintGL();//<1мс
	setWindowTitle(QString::number(time.elapsed()));
}

void Widget::resizeGL(int w, int h){
	glViewport(0, 0, w, h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(0, w, h, 0, 1, -1);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}

void Widget::paintGL(){
	glClear(GL_COLOR_BUFFER_BIT);
}

QImage tex(16, 16, QImage::Format_ARGB32);

QPainter p;
p.begin(&tex);
	p.fillRect(0, 0, 16, 16, QBrush(QColor::fromRgbF(0,0,0,0)));
p.end();

bindTexture(tex);

#include <GL/glext.h>
#include <GL/glxext.h>

LIBS     += a.a

tmpxft_00000e76_00000000-1_1.cudafe1.cpp:(.text+0x21): undefined reference to `cudaMalloc'
tmpxft_00000e76_00000000-1_1.cudafe1.cpp:(.text+0x7b): undefined reference to `cudaConfigureCall'
tmpxft_00000e76_00000000-1_1.cudafe1.cpp:(.text+0xab): undefined reference to `cudaMemcpy'
tmpxft_00000e76_00000000-1_1.cudafe1.cpp:(.text+0xb7): undefined reference to `cudaFree'
a.a(tmpxft_00000e76_00000000-13_1.o): In function `__cudaUnregisterBinaryUtil()':
tmpxft_00000e76_00000000-1_1.cudafe1.cpp:(.text+0x11c): undefined reference to `__cudaUnregisterFatBinary'
a.a(tmpxft_00000e76_00000000-13_1.o): In function `__device_stub__Z6kernelPf(float*)':
tmpxft_00000e76_00000000-1_1.cudafe1.cpp:(.text+0x1226): undefined reference to `cudaSetupArgument'
a.a(tmpxft_00000e76_00000000-13_1.o): In function `__sti____cudaRegisterAll_36_tmpxft_00000e76_00000000_4_1_cpp1_ii_146421d2()':
tmpxft_00000e76_00000000-1_1.cudafe1.cpp:(.text+0x127a): undefined reference to `__cudaRegisterFatBinary'
tmpxft_00000e76_00000000-1_1.cudafe1.cpp:(.text+0x12db): undefined reference to `__cudaRegisterFunction'
a.a(tmpxft_00000e76_00000000-13_1.o): In function `cudaError cudaLaunch<char>(char*)':
tmpxft_00000e76_00000000-1_1.cudafe1.cpp:(.text._Z10cudaLaunchIcE9cudaErrorPT_[cudaError cudaLaunch<char>(char*)]+0x14): undefined reference to `cudaLaunch'
collect2: ld returned 1 exit status
make: *** [untitled] Ошибка 1
Процесс «/usr/bin/make» завершился с кодом 2.
Возникла ошибка при сборке проекта untitled (цель: Desktop)
Во время выполнения сборки на этапе «Сборка»

#include <stdio.h>
#include "1.h"

#define N (1024*1024)
__global__ void kernel ( float * data )
{
	int idx = blockIdx.x * blockDim.x + threadIdx.x;
	float x = 2.0f * 3.1415926f * (float) idx / (float) N;
	data [idx] = sinf ( sqrtf ( x ) );
}

int foo ()
{
	float a [N];
	float * dev = NULL;
	cudaMalloc ( (void**)&dev, N * sizeof ( float ) );
	kernel<<<dim3((N/512),1), dim3(512,1)>>> ( dev );
	cudaMemcpy ( a, dev, N * sizeof ( float ), cudaMemcpyDeviceToHost );
	cudaFree( dev );
	for (int idx = 0; idx < N; idx++)
		printf("a[%d] = %.5f\n", idx, a[idx]);
	return 0;
}

int foo ();

nvcc 1.cu -lib

int *a = new[this->width()*this->height()];

void MainWindow::paintEvent(QPaintEvent *){
	QPainter p;
	p.begin(this);
	p.setPen(QPen(QColor(rand()%16777000)));
//------------------------------------------------------------------------------------------------------- 1
	for (int i=0; i<this->width(); i++)
		for (int j=0; j<this->height(); j++){
			p.drawPoint(i,j); // 360-430 ms
		}
//------------------------------------------------------------------------------------------------------- 2
	QPoint *points = new QPoint[this->width()*this->height()];
	for (int i=0; i<this->width(); i++)
		for (int j=0; j<this->height(); j++){
			points[j*this->width()+i].setX(i);
			points[j*this->width()+i].setY(j);
		}
	p.drawPoints(points, this->width()*this->height()); // 18-29 ms
//------------------------------------------------------------------------------------------------------- 3
	QPixmap pxm(this->width(), this->height());
	p.drawPixmap(0, 0, pxm); // <1 ms
	
	p.end();
}