main(void)
{
long int i;
rseed(clock());
for(i=0;i<100000;i++)
printf("%g %g\n",unirnd(),normrnd());
}
//----------------------------------------------------------------------------
void PerformanceAMDWindow::CreateScene()
{
struct Vertex
{
Vector3<float> position;
Vector2<float> tcoord;
};
VertexFormat vformat;
vformat.Bind(VA_POSITION, DF_R32G32B32_FLOAT, 0);
vformat.Bind(VA_TEXCOORD, DF_R32G32_FLOAT, 0);
unsigned int const numTriangles = 1024;
unsigned int const numVertices = 3 * numTriangles;
std::shared_ptr<VertexBuffer> vbuffer(new VertexBuffer(vformat,
numVertices));
// Randomly generate positions and texture coordinates.
std::mt19937 mte;
std::uniform_real_distribution<float> unirnd(0.0f, 1.0f);
std::uniform_real_distribution<float> symrnd(-1.0f, 1.0f);
Vertex* vertex = vbuffer->Get<Vertex>();
for (unsigned int i = 0; i < numVertices; ++i)
{
for (int j = 0; j < 3; ++j)
{
vertex[i].position[j] = symrnd(mte);
}
for (int j = 0; j < 2; ++j)
{
vertex[i].tcoord[j] = unirnd(mte);
}
}
// The vertices are not indexed. Each consecutive triple is a triangle.
std::shared_ptr<IndexBuffer> ibuffer(new IndexBuffer(IP_TRIMESH,
numTriangles));
// Use a standard texture effect.
std::shared_ptr<Texture2Effect> effect(new Texture2Effect(
mProgramFactory, mBlurredTexture, SamplerState::MIN_L_MAG_L_MIP_P,
SamplerState::CLAMP, SamplerState::CLAMP));
mPVWMatrix = effect->GetPVWMatrixConstant();
mTriangles.reset(new Visual(vbuffer, ibuffer, effect));
SubscribeCW(mTriangles, mPVWMatrix);
EnableObjectMotion();
}
double normrnd(void)
/*! Gaussion random variable with zero mean and variace 1.0.
** Taken from Numerical Cecipies in C.
*/
{
static int iset=0;
static double gset;
double fac,rsq,v1,v2;
if (iset == 0) {
do {
v1=2.0*unirnd()-1.0;
v2=2.0*unirnd()-1.0;
rsq=v1*v1+v2*v2;
} while (rsq >= 1.0 || rsq == 0.0);
fac=sqrt(-2.0*log(rsq)/rsq);
gset=v1*fac;
iset=1;
return v2*fac;
} else {
iset=0;
return gset;
}
}
