Refactor rendering projects

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

@@ -0,0 +1,183 @@
+using Ghost.Core;
+using Ghost.Core.Graphics;
+using Ghost.Core.Utilities;
+using System.IO.Hashing;
+using System.Runtime.InteropServices;
+
+namespace Ghost.Graphics.RHI;
+
+public static class RHIUtility
+{
+    public const int MAX_RENDER_TARGETS = 8;
+
+    public static uint GetBytesPerPixel(this TextureFormat format)
+    {
+        return format switch
+        {
+            TextureFormat.R8G8B8A8_UNorm => 4,
+            TextureFormat.B8G8R8A8_UNorm => 4,
+            TextureFormat.R16G16B16A16_Float => 8,
+            TextureFormat.R32G32B32A32_Float => 16,
+            TextureFormat.D24_UNorm_S8_UInt => 4,
+            TextureFormat.D32_Float => 4,
+            _ => throw new NotSupportedException($"Texture format {format} is not supported."),
+        };
+    }
+
+    public static uint GetTotalBytes(this TextureDesc desc)
+    {
+        return desc.Format.GetBytesPerPixel() * desc.Width * desc.Height * desc.Slice;
+    }
+
+    public static void GetSurfaceInfo(this TextureFormat format, uint width, uint height, out uint rowPitch, out uint slicePitch, out uint rowCount)
+    {
+        var bc = false;
+        var packed = false;
+        var planar = false;
+        var bpe = 0u;
+
+        //switch (Format)
+        //{
+        //    case Format.BC1Typeless:
+        //    case Format.BC1Unorm:
+        //    case Format.BC1UnormSrgb:
+        //    case Format.BC4Typeless:
+        //    case Format.BC4Unorm:
+        //    case Format.BC4Snorm:
+        //        bc = true;
+        //        bpe = 8;
+        //        break;
+
+        //    case Format.BC2Typeless:
+        //    case Format.BC2Unorm:
+        //    case Format.BC2UnormSrgb:
+        //    case Format.BC3Typeless:
+        //    case Format.BC3Unorm:
+        //    case Format.BC3UnormSrgb:
+        //    case Format.BC5Typeless:
+        //    case Format.BC5Unorm:
+        //    case Format.BC5Snorm:
+        //    case Format.BC6HTypeless:
+        //    case Format.BC6HUF16:
+        //    case Format.BC6HSF16:
+        //    case Format.BC7Typeless:
+        //    case Format.BC7Unorm:
+        //    case Format.BC7UnormSrgb:
+        //        bc = true;
+        //        bpe = 16;
+        //        break;
+
+        //    case Format.R8G8_B8G8Unorm:
+        //    case Format.G8R8_G8B8Unorm:
+        //    case Format.YUY2:
+        //        packed = true;
+        //        bpe = 4;
+        //        break;
+
+        //    case Format.Y210:
+        //    case Format.Y216:
+        //        packed = true;
+        //        bpe = 8;
+        //        break;
+
+        //    case Format.NV12:
+        //    case Format.Opaque420:
+        //    case Format.P208:
+        //        planar = true;
+        //        bpe = 2;
+        //        break;
+
+        //    case Format.P010:
+        //    case Format.P016:
+        //        planar = true;
+        //        bpe = 4;
+        //        break;
+
+        //    default:
+        //        break;
+        //}
+
+        if (bc)
+        {
+            var numBlocksWide = 0u;
+            if (width > 0)
+            {
+                numBlocksWide = Math.Max(1u, (width + 3) / 4u);
+            }
+
+            var numBlocksHigh = 0u;
+            if (height > 0)
+            {
+                numBlocksHigh = Math.Max(1u, (height + 3) / 4u);
+            }
+
+            rowPitch = numBlocksWide * bpe;
+            rowCount = numBlocksHigh;
+            slicePitch = rowPitch * numBlocksHigh;
+        }
+        else if (packed)
+        {
+            rowPitch = ((width + 1u) >> 1) * bpe;
+            rowCount = height;
+            slicePitch = rowPitch * height;
+        }
+        else if (planar)
+        {
+            rowPitch = ((width + 1u) >> 1) * bpe;
+            slicePitch = (rowPitch * height) + ((rowPitch * height + 1) >> 1);
+            rowCount = height + ((height + 1u) >> 1);
+        }
+        else
+        {
+            var bpp = GetBytesPerPixel(format) * 8;
+            rowPitch = (width * bpp + 7) / 8; // round up to nearest byte
+            rowCount = height;
+            slicePitch = rowPitch * height;
+        }
+    }
+
+    public static Key64<ShaderPass> CreateShaderPassKey(string passID)
+    {
+        var passIdSpan = passID.AsSpan();
+        return new Key64<ShaderPass>(XxHash3.HashToUInt64(MemoryMarshal.AsBytes(passIdSpan)));
+    }
+
+    public static Key64<ShaderVariant> CreateShaderVariantKey(Key64<ShaderPass> passKey, ref readonly LocalKeywordSet keywords)
+    {
+        var passHash = passKey.Value;
+        var keywordHash = keywords.GetHash64();
+        return new Key64<ShaderVariant>(Hash.Hash64(passHash, keywordHash));
+    }
+
+    public static unsafe Key128<GraphicsPipeline> CreateGraphicsPipelineKey(Key64<ShaderVariant> shaderVariantKey, PipelineState pipelineState, PassPipelineHash passKey)
+    {
+        // Order-sensitive 128-bit mix. Cheap and stable, avoids span hashing.
+        static ulong Mix64(ulong x)
+        {
+            x ^= x >> 30;
+            x *= 0xBF58476D1CE4E5B9ul;
+            x ^= x >> 27;
+            x *= 0x94D049BB133111EBul;
+            x ^= x >> 31;
+            return x;
+        }
+
+        var mLo = shaderVariantKey.Value;
+        var mHi = pipelineState.GetHashCode64();
+
+        var pPasskey = (ulong*)&passKey.value;
+        var pLo = pPasskey[0];
+        var pHi = pPasskey[1];
+
+        // Distinct constants + cross-feeding to reduce structural collisions.
+        var lo = Mix64(mLo ^ (pLo + 0x9E3779B97F4A7C15ul) ^ (mHi * 0xD6E8FEB86659FD93ul));
+        var hi = Mix64(mHi ^ (pHi + 0xC2B2AE3D27D4EB4Ful) ^ (pLo * 0x165667B19E3779F9ul));
+
+        return new Key128<GraphicsPipeline>(new UInt128(lo, hi));
+    }
+
+    public static bool TryGetString(this Key128<GraphicsPipeline> key, Span<char> destination)
+    {
+        return key.Value.TryFormat(destination, out var _, "X16");
+    }
+}