private void MapPerformance_Core()
{
const int TestMaxTime = 30, TestMaxSize = 1024 * 1024 * 16;
const int TestSizeStep = 1024;
// Determine test array size;
Vertex3f[] testArray = new Vertex3f[TestSizeStep];
Stopwatch crono = new Stopwatch();
int testCalibrationLoops = 0;
crono.Start();
do
{
for (int i = 0; i < TestSizeStep; i++, testCalibrationLoops++)
{
Vertex3f testElement = testArray[i];
testElement = testElement.Normalized;
}
} while (crono.ElapsedMilliseconds < TestMaxTime);
crono.Stop();
// Allocate and initialize test array
int testArraySize = Math.Min(TestMaxSize, 1024 * 512);
testArray = new Vertex3f[testArraySize];
Stopwatch cronoArray = new Stopwatch();
Stopwatch cronoBuffer = new Stopwatch();
cronoArray.Start();
for (int i = 0; i < testArray.Length; i++)
{
Vertex3f testElement = testArray[i];
testElement = testElement.Normalized;
}
cronoArray.Stop();
// Test mapped buffer access performance respect the native array access
using (ArrayBufferObject arrayBuffer = new ArrayBufferObject(VertexBaseType.Float, 3, BufferObjectHint.StaticCpuDraw)) {
arrayBuffer.Create(_Context, testArray);
cronoBuffer.Start();
arrayBuffer.Map(_Context, BufferAccessARB.ReadOnly);
for (uint i = 0; i < arrayBuffer.ItemCount; i++)
{
Vertex3f testElement = arrayBuffer.Get(i);;
testElement = testElement.Normalized;
}
arrayBuffer.Unmap(_Context);
cronoBuffer.Stop();
}
Console.WriteLine("Map performance timings: Array={0} ms buffer={1} ms", cronoArray.ElapsedMilliseconds, cronoBuffer.ElapsedMilliseconds);
Assert.That((float)cronoArray.ElapsedMilliseconds / (float)cronoBuffer.ElapsedMilliseconds < 1.5f);
}