/// <summary>
/// Helper for setting the renderstates used to draw particles.
/// </summary>
void SetParticleRenderStates(GraphicsDevice device)
{
// Enable point sprites.
PointSpriteHelper.Enable();
// renderState.PointSizeMax = 256; // FIXME: Do we care? -flibit
// Set the alpha blend mode.
BlendStateHelper.BeginApply(device);
BlendStateHelper.AlphaBlendEnable = true;
BlendStateHelper.SourceBlend = settings.SourceBlend;
BlendStateHelper.DestinationBlend = settings.DestinationBlend;
BlendStateHelper.EndApply(device);
// Enable the depth buffer (so particles will not be visible through
// solid objects like the ground plane), but disable depth writes
// (so particles will not obscure other particles).
device.DepthStencilState = DepthStencilState.DepthRead;
}
public void Draw(GameTime gameTime, Camera camera)
{
try
{
// First, we need to figure out which stars
// are behind us and throw them out in front of us again
// based on how fast the camera is moving
if (!motionReady)
{
GenerateStars(camera);
vertexBuffer.SetData <VertexPointSprite>(data);
}
else
{
MoveStars(camera);
vertexBuffer.SetData <VertexPointSprite>(data);
}
{
//
// STARS
//
starEffect.Parameters["World"].SetValue(Matrix.Identity);
starEffect.Parameters["View"].SetValue(camera.View);
starEffect.Parameters["Projection"].SetValue(camera.Projection);
starEffect.Parameters["Texture"].SetValue(starTexture);
starEffect.Parameters["ViewportHeight"].SetValue(GraphicsDevice.Viewport.Height);
GraphicsDevice.SetVertexBuffer(vertexBuffer);
PointSpriteHelper.Enable();
// Set the alpha blend mode.
BlendStateHelper.BeginApply(GraphicsDevice);
BlendStateHelper.AlphaBlendEnable = true;
BlendStateHelper.SourceBlend = Blend.SourceAlpha;
BlendStateHelper.DestinationBlend = Blend.InverseSourceAlpha;
BlendStateHelper.EndApply(GraphicsDevice);
// Enable the depth buffer (so particles will not be visible through
// solid objects like the space ship), but disable depth writes
// (so particles will not obscure other particles).
GraphicsDevice.DepthStencilState = DepthStencilState.DepthRead;
for (int i = 0; i < starEffect.CurrentTechnique.Passes.Count; ++i)
{
starEffect.CurrentTechnique.Passes[i].Apply();
#if SDL2
GraphicsDevice.DrawPrimitives(PrimitiveType.PointListEXT, 0, starCount);
#endif
}
PointSpriteHelper.Disable();
GraphicsDevice.SetVertexBuffer(null);
BlendStateHelper.BeginApply(GraphicsDevice);
BlendStateHelper.AlphaBlendEnable = false;
BlendStateHelper.EndApply(GraphicsDevice);
if (GraphicsDevice.DepthStencilState.DepthBufferEnable)
{
GraphicsDevice.DepthStencilState = DepthStencilState.Default;
}
else
{
GraphicsDevice.DepthStencilState = Helpers.DepthWrite;
}
}
base.Draw(gameTime);
}
catch
{
}
}
