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void GLWidget::initializeGL()
{
	glClearColor(0.0, 0.0, 0.0, 1.0);
    glDisable(GL_DEPTH_TEST);

    // viewport
    glViewport(0, 0, window_width, window_height);
	
    // projection
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();

	initglew();

	createVBO(&vboPos, &cuda_vbo_resource_pos,2);
	createVBO(&vboColor, &cuda_vbo_resource_color,2);
	runCudaPos(&cuda_vbo_resource_pos);
	runCudaColor(&cuda_vbo_resource_color);
}

void runCudaColor(struct cudaGraphicsResource **vbo_resource)
{
	float4 *dptr;	
    checkCudaErrors(cudaGraphicsMapResources(1, vbo_resource, 0));
    size_t num_bytes;
    checkCudaErrors(cudaGraphicsResourceGetMappedPointer((void **)&dptr, &num_bytes,
                                                         *vbo_resource));
    
    launch_kernel_color(dptr, dmesh_width, dmesh_height, g_fAnim);

    // unmap buffer object
    checkCudaErrors(cudaGraphicsUnmapResources(1, vbo_resource, 0));
}

void display(GLuint *vboPos, GLuint *vboColor)
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	
     // set view matrix
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
    

     // render from the vbo
	glEnableClientState  ( GL_VERTEX_ARRAY );
    glBindBuffer(GL_ARRAY_BUFFER, *vboPos);
    glVertexPointer(4, GL_FLOAT, 0, 0);

	glEnableClientState  ( GL_COLOR_ARRAY );
	glBindBuffer(GL_ARRAY_BUFFER, *vboColor);
	glColorPointer(4, GL_FLOAT, 0, 0);

	//glColor3f(1.0, 0.0, 0.0);
     glDrawArrays(GL_POINTS, 0, dmesh_width * dmesh_height);
     glDisableClientState(GL_VERTEX_ARRAY);
	glDisableClientState(GL_COLOR_ARRAY);

    
}
void GLWidget::paintGL()
{
	display(&vboPos, &vboColor);
	swapBuffers();

}