public void Initialize(RenderView renderView, RenderLight renderLight, IDirectLight light, LightShadowMap shadowMap, int size, ILightShadowMapRenderer renderer)
{
if (renderView == null)
{
throw new ArgumentNullException(nameof(renderView));
}
if (renderLight == null)
{
throw new ArgumentNullException(nameof(renderLight));
}
if (light == null)
{
throw new ArgumentNullException(nameof(light));
}
if (shadowMap == null)
{
throw new ArgumentNullException(nameof(shadowMap));
}
if (renderer == null)
{
throw new ArgumentNullException(nameof(renderer));
}
RenderView = renderView;
RenderLight = renderLight;
Light = light;
Shadow = shadowMap;
Size = size;
FilterType = Shadow.Filter == null || !Shadow.Filter.RequiresCustomBuffer() ? null : Shadow.Filter.GetType();
Renderer = renderer;
Atlas = null; // Reset the atlas, It will be setup after
CascadeCount = 1;
ShadowType = renderer.GetShadowType(Shadow);
}
private void AssignRectangle(LightShadowMapTexture lightShadowMapTexture)
{
var size = lightShadowMapTexture.Size;
// Try to fit the shadow map into an existing atlas
ShadowMapAtlasTexture currentAtlas = null;
foreach (var atlas in atlases)
{
if (atlas.TryInsert(size, size, lightShadowMapTexture.CascadeCount, (int index, ref Rectangle rectangle) => lightShadowMapTexture.SetRectangle(index, rectangle)))
{
currentAtlas = atlas;
break;
}
}
// Allocate a new atlas texture
if (currentAtlas == null)
{
// For now, our policy is to allow only one shadow map, esp. because we can have only one shadow texture per lighting group
// TODO: Group by DirectLightGroups, so that we can have different atlas per lighting group
// TODO: Allow multiple textures per LightingGroup (using array of Texture?)
if (atlases.Count == 0)
{
// TODO: handle FilterType texture creation here
// TODO: This does not work for Omni lights
// TODO: Allow format selection externally
var texture = Texture.New2D(RenderSystem.GraphicsDevice, maximumTextureSize, maximumTextureSize, 1, PixelFormat.D32_Float, TextureFlags.DepthStencil | TextureFlags.ShaderResource);
currentAtlas = new ShadowMapAtlasTexture(texture, atlases.Count)
{
FilterType = lightShadowMapTexture.FilterType
};
atlases.Add(currentAtlas);
for (int i = 0; i < lightShadowMapTexture.CascadeCount; i++)
{
var rect = Rectangle.Empty;
currentAtlas.Insert(size, size, ref rect);
lightShadowMapTexture.SetRectangle(i, rect);
}
}
}
// Make sure the atlas cleared (will be clear just once)
lightShadowMapTexture.Atlas = currentAtlas;
lightShadowMapTexture.TextureId = (byte)(currentAtlas?.Id ?? 0);
}