1  using System;
 2  using System.Runtime.InteropServices;
 3  
 4  namespace Ryujinx.Graphics.Vulkan
 5  {
 6      class FormatConverter
 7      {
 8          public static void ConvertD24S8ToD32FS8(Span<byte> output, ReadOnlySpan<byte> input)
 9          {
10              const float UnormToFloat = 1f / 0xffffff;
11  
12              Span<uint> outputUint = MemoryMarshal.Cast<byte, uint>(output);
13              ReadOnlySpan<uint> inputUint = MemoryMarshal.Cast<byte, uint>(input);
14  
15              int i = 0;
16  
17              for (; i < inputUint.Length; i++)
18              {
19                  uint depthStencil = inputUint[i];
20                  uint depth = depthStencil >> 8;
21                  uint stencil = depthStencil & 0xff;
22  
23                  int j = i * 2;
24  
25                  outputUint[j] = (uint)BitConverter.SingleToInt32Bits(depth * UnormToFloat);
26                  outputUint[j + 1] = stencil;
27              }
28          }
29  
30          public static void ConvertD32FS8ToD24S8(Span<byte> output, ReadOnlySpan<byte> input)
31          {
32              Span<uint> outputUint = MemoryMarshal.Cast<byte, uint>(output);
33              ReadOnlySpan<uint> inputUint = MemoryMarshal.Cast<byte, uint>(input);
34  
35              int i = 0;
36  
37              for (; i < inputUint.Length; i += 2)
38              {
39                  float depth = BitConverter.Int32BitsToSingle((int)inputUint[i]);
40                  uint stencil = inputUint[i + 1];
41                  uint depthStencil = (Math.Clamp((uint)(depth * 0xffffff), 0, 0xffffff) << 8) | (stencil & 0xff);
42  
43                  int j = i >> 1;
44  
45                  outputUint[j] = depthStencil;
46              }
47          }
48      }
49  }