/// <summary>
/// Prepares the light map to be drawn (pre-render)
/// </summary>
public void LightMapPrepare()
{
// Prepare the matrix with optional settings and assign it to an effect parameter
Matrix lightMapMatrix = LightmapMatrixGet();
_effect.Parameters["Matrix"].SetValue(lightMapMatrix);
// Obtain the original rendering states
var originalRenderTargets = GraphicsDevice.GetRenderTargets();
// Set and clear the target
GraphicsDevice.SetRenderTarget(_map);
GraphicsDevice.Clear(ClearOptions.Target | ClearOptions.Stencil, AmbientColor, 0, 1);
// Make sure we're culling the right way!
GraphicsDevice.RasterizerState = KryptonEngine.RasterizerStateGetFromCullMode(CullMode);
// put the render target's size into a more friendly format
var targetSize = new Vector2(_map.Width, _map.Height);
// Render Light Maps
foreach (var light in Lights)
{
// Loop through each light within the view frustum
if (!light.Bounds.Intersects(_bounds))
{
continue;
}
// Clear the stencil and set the scissor rect (because we're stretching geometry past the light's reach)
GraphicsDevice.Clear(
options: ClearOptions.Stencil,
color: Color.Black,
depth: 0,
stencil: 0);
GraphicsDevice.ScissorRectangle =
ScissorRectCreateForLight(
light: light,
matrix: lightMapMatrix,
targetSize: targetSize);
// Draw the light!
light.Draw(RenderHelper, Hulls);
}
if (_bluriness > 0)
{
// Blur the shadow map horizontally to the blur target
GraphicsDevice.SetRenderTarget(_mapBlur);
RenderHelper.BlurTextureToTarget(
_map,
LightMapSize.Full,
BlurTechnique.Horizontal,
_bluriness);
// Blur the shadow map vertically back to the final map
GraphicsDevice.SetRenderTarget(_map);
RenderHelper.BlurTextureToTarget(
_mapBlur,
LightMapSize.Full,
BlurTechnique.Vertical,
_bluriness);
}
// Reset to the original rendering states
GraphicsDevice.SetRenderTargets(originalRenderTargets);
}
