protected void RenderShadowMap(ShadowBatch batch, bool flipNormal, RenderTarget2D shadowTarget, ref Matrix proj, ref Matrix view)
{
GraphicsDevice.SetRenderTarget(shadowTarget);
GraphicsDevice.Clear(Color.White);
GraphicsDevice.Clear(Color.Black);
_shadowEffect.Projection = proj;
_shadowEffect.View = view;
_shadowEffect.CurrentTechnique.Passes[0].Apply(); // CurrentTechnique is "LightDrawing"
if (batch.VerticesCount >= 3)
{
int primitiveCount = batch.VerticesCount / 3;
// submit the draw call to the graphics card
GraphicsDevice.BlendState = BlendState.Opaque;
GraphicsDevice.SamplerStates[0] = SamplerState.LinearClamp;
GraphicsDevice.DepthStencilState = DepthStencilState.Default;
GraphicsDevice.RasterizerState = (flipNormal) ? RasterizerState.CullCounterClockwise : RasterizerState.CullClockwise;
GraphicsDevice.DrawUserPrimitives(PrimitiveType.TriangleList, batch.Vertices, 0, primitiveCount);
}
return;
}
public void RenderShadowMap(ShadowBatch batch, bool flipNormal = false, float nearPlane = 0.001f)
{
var pos = new Vector3(body.Position, 0.0f);
_shadowEffect.FogStart = 0.0f;
_shadowEffect.FogEnd = LightRadius;
var proj = Matrix.CreatePerspectiveFieldOfView(MathHelper.Pi / 2f, 1f, nearPlane, LightRadius);
var viewU = Matrix.CreateLookAt(pos, pos + Vector3.Up, Vector3.Backward);
var viewR = Matrix.CreateLookAt(pos, pos + Vector3.Right, Vector3.Backward);
var viewD = Matrix.CreateLookAt(pos, pos + Vector3.Down, Vector3.Backward);
var viewL = Matrix.CreateLookAt(pos, pos + Vector3.Left, Vector3.Backward);
#if XNA
proj = proj * Matrix.CreateTranslation(0f, 1.0f, 0f); // one pixel up
#endif
RenderShadowMap(batch, flipNormal, ShadowMapU, ref proj, ref viewU);
RenderShadowMap(batch, flipNormal, ShadowMapR, ref proj, ref viewR);
RenderShadowMap(batch, flipNormal, ShadowMapD, ref proj, ref viewD);
RenderShadowMap(batch, flipNormal, ShadowMapL, ref proj, ref viewL);
GraphicsDevice.SetRenderTarget(null);
}
