public ScreenBuffer CreateScreenBuffer(BufferEnum id, Vector2i size)
{
var bufferFound = ScreenBuffers.TryGetValue(id, out ScreenBuffer buffer);
if (!bufferFound || size.Area() * 4 != buffer.Data?.Length)
{
// different size
if (bufferFound && buffer.Allocated())
{
// free old buffer
SDL2.SDL.SDL_FreeSurface(buffer.SdlSurfacePtr);
Marshal.FreeHGlobal(buffer.UnmanagedPtr);
}
// create new buffer
buffer = new ScreenBuffer
{
Data = new byte[size.Area() * 4]
};
buffer.UnmanagedPtr = Marshal.AllocHGlobal(buffer.Data.Length);
buffer.SdlSurfacePtr = SDL2.SDL.SDL_CreateRGBSurfaceFrom(buffer.UnmanagedPtr,
size.X, size.Y, 32, 4 * size.X,
0xff000000,
0x00ff0000,
0x0000ff00,
0x000000ff);
if (!bufferFound)
{
ScreenBuffers.Add(id, buffer);
}
else
{
ScreenBuffers[id] = buffer;
}
Log.Add($"Renderer.ScreenBuffer({ id }, { size })");
}
return(buffer);
}
protected override void Init()
{
var n = 100000000;
double result = 0;
var start = Program.Elapsed();
for (var i = 0; i < n; i++)
{
var v = new Vector2i(i, i);
result += v.Area();
}
Log.Add($"AllocTest#new({ n }): { result } { (Program.Elapsed() - start):0.00}ms");
result = 0;
start = Program.Elapsed();
for (var i = 0; i < n; i++)
{
var v = Vector2i.Zero;
v.X = i;
v.Y = i;
result += v.Area();
}
Log.Add($"AllocTest#zero+set({ n }): { result } { (Program.Elapsed() - start):0.00}ms");
result = 0;
start = Program.Elapsed();
for (var i = 0; i < n; i++)
{
var v = default(Vector2i);
v.X = i;
v.Y = i;
result += v.Area();
}
Log.Add($"AllocTest#default({ n }): { result } { (Program.Elapsed() - start):0.00}ms");
result = 0;
start = Program.Elapsed();
for (var i = 0; i < n; i++)
{
Vector2i v;
v.X = i;
v.Y = i;
result += v.Area();
}
Log.Add($"AllocTest#classic({ n }): { result } { (Program.Elapsed() - start):0.00}ms");
result = 0;
start = Program.Elapsed();
for (var i = 0; i < n; i++)
{
var v = default(Vector2i);
v.Set(i, i);
result += v.Area();
}
Log.Add($"AllocTest#default+Set()({ n }): { result } { (Program.Elapsed() - start):0.00}ms");
result = 0;
var v2 = Vector2i.Zero;
start = Program.Elapsed();
for (var i = 0; i < n; i++)
{
v2.X = i;
v2.Y = i;
result += v2.Area();
}
Log.Add($"AllocTest#reuse({ n }): { result } { (Program.Elapsed() - start):0.00}ms");
result = 0;
start = Program.Elapsed();
Parallel.For(0, n, (i) =>
{
var v = new Vector2i(i, i);
result += v.Area();
});
Log.Add($"AllocTest#new+parallel({ n }): { result } { (Program.Elapsed() - start):0.00}ms");
}
