/// <summary>
/// numberOfBuffers is the amount of vertex buffers used by the particle system for multi buffering.
/// Multi buffering can avoid stalling of the GPU but will also increases it's memory consumption.
/// If you want to avoid stalling create the same amount of buffers as your maximum rendered emitters at the
/// same time.
/// For example allocating one buffer with 16383 particles takes up 2048KB(2MB) GPU memory.
/// This call requires that there is a GL context
/// </summary>
/// <param name="numberOfBuffers">the amount of vertex buffers used by the particle system for multi buffering.</param>
/// <param name="maxParticlesPerBuffer">Maximum number of particles that you will be able to display.</param>
public static void Init(int numberOfBuffers = 2, int maxParticlesPerBuffer = MaxPossibleParticles)
{
_numberOfVertexBuffers = numberOfBuffers;
if (maxParticlesPerBuffer > MaxPossibleParticles)
{
maxParticlesPerBuffer = MaxPossibleParticles;
Debug.WriteLine("StardustStarlingRenderer WARNING: Tried to render than possible particles, setting value to max");
}
_maxParticles = maxParticlesPerBuffer;
SparrowParticleBuffers.CreateBuffers(maxParticlesPerBuffer, numberOfBuffers);
if (!_initCalled)
{
for (int i = 0; i < 0x800; ++i)
{
SCosLut[i & 0x7FF] = (float)Math.Cos(i * 0.00306796157577128245943617517898); // 0.003067 = 2PI/2048
SSinLut[i & 0x7FF] = (float)Math.Sin(i * 0.00306796157577128245943617517898);
}
// handle a lost device context
SparrowSharp.ContextCreated += SparrowSharpOnContextCreated;
_initCalled = true;
}
}
private static void SparrowSharpOnContextCreated()
{
SparrowParticleBuffers.CreateBuffers(_maxParticles, _numberOfVertexBuffers);
}