Refactor rendering projects

src/Runtime/Ghost.Graphics.RHI/RootSignatureLayout.cs

@@ -0,0 +1,75 @@
+using Misaki.HighPerformance.Mathematics;
+using System.Runtime.InteropServices;
+
+namespace Ghost.Graphics.RHI;
+
+/// <summary>
+/// The layout of the root signature is:
+/// <list space="bullet">
+/// <item>
+/// Global buffer (b0)
+/// </item>
+/// <item>
+/// Per-view buffer (b1)
+/// </item>
+/// <item>
+/// Per-object buffer (b2)
+/// </item>
+/// <item>
+/// Per-material buffer (b3)
+/// </item>
+/// <item>
+/// Descriptor table for bindless textures (t0)
+/// </item>
+/// <item>
+/// Descriptor table for bindless samplers (s0)
+/// </item>
+/// </list>
+/// </summary>
+public static class RootSignatureLayout
+{
+    // public const int GLOBAL_BUFFER_SLOT = 0;
+    // public const int PER_VIEW_BUFFER_SLOT = 1;
+    // public const int PER_OBJECT_BUFFER_SLOT = 2;
+    // public const int PER_MATERIAL_BUFFER_SLOT = 3;
+
+    // public const int TEXTURE_HEAP_SLOT = 0;
+    // public const int SAMPLER_HEAP_SLOT = 0;
+
+    public const int PUSH_CONSTANT_SLOT = 0;
+
+    public const int ROOT_PARAMETER_COUNT = 1;
+}
+
+[StructLayout(LayoutKind.Sequential, Size = 16)]
+public struct PushConstantsData
+{
+    public uint globalIndex;
+    public uint viewIndex;
+    public uint objectIndex;
+    public uint materialIndex;
+}
+
+// The size should be 176 bytes (16-byte aligned)
+[StructLayout(LayoutKind.Sequential, Pack = 1)]
+public struct PerViewData
+{
+    public float4x4 viewMatrix;
+    public float4x4 projectionMatrix;
+    public float3 cameraPosition;
+    public float nearClip;
+    public float3 cameraDirection;
+    public float farClip;
+    public float4 screenSize; // xy: size, zw: 1/size
+};
+
+// The size should be 96 bytes (16-byte aligned)
+[StructLayout(LayoutKind.Sequential, Pack = 1)]
+public struct PerObjectData
+{
+    public float4x4 localToWorld;
+    public float3 worldBoundsMin;
+    public uint vertexBuffer;
+    public float3 worldBoundsMax;
+    public uint indexBuffer;
+};