ShadowMapTexture.cs

ShadowMapTexture.cs

using System;
using Veldrid;

namespace LifeSim.Engine.Rendering;

public class ShadowMapTexture : ITexture, IDisposable
{
    public uint Width { get; private set; }

    public uint Height { get; private set; }

    public uint ArrayLayers { get; private set; }

    public Veldrid.Texture DeviceTexture { get; private set; }

    public Sampler Sampler { get; private set; }

    public Sampler ShadowSampler { get; private set; }

    public Framebuffer[] Framebuffers { get; private set; }

    public ShadowMapTexture(GraphicsDevice gd, uint width, uint height, uint arrayLayers)
    {
        this.Width = width;
        this.Height = height;
        this.ArrayLayers = arrayLayers;
        this.DeviceTexture = gd.ResourceFactory.CreateTexture(TextureDescription.Texture2D(this.Width, this.Height, 1, this.ArrayLayers, PixelFormat.R32_Float, TextureUsage.DepthStencil | TextureUsage.Sampled));

        this.Sampler = gd.LinearSampler;

        this.ShadowSampler = gd.ResourceFactory.CreateSampler(new SamplerDescription(
            SamplerAddressMode.Border, SamplerAddressMode.Border, SamplerAddressMode.Border,
            SamplerFilter.MinLinear_MagLinear_MipPoint,
            //null, 
            ComparisonKind.Greater,
            0, 0, 0, 0, SamplerBorderColor.OpaqueWhite
        ));

        this.Framebuffers = new Framebuffer[this.ArrayLayers];

        for (uint i = 0; i < this.ArrayLayers; i++)
        {
            this.Framebuffers[i] = gd.ResourceFactory.CreateFramebuffer(new FramebufferDescription(
                new FramebufferAttachmentDescription(this.DeviceTexture, i),
                Array.Empty<FramebufferAttachmentDescription>()
            ));
        }
    }

    public void Dispose()
    {
        this.DeviceTexture.Dispose();
        this.Sampler.Dispose();

        foreach (Framebuffer fb in this.Framebuffers)
        {
            fb.Dispose();
        }
    }
}