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using Ryujinx.Common;
using Ryujinx.Graphics.GAL;
using System;
using System.Runtime.InteropServices;
namespace Ryujinx.Graphics.Gpu.Engine.MME
{
/// <summary>
/// Table with information about High-level implementations of GPU Macro code.
/// </summary>
static class MacroHLETable
{
/// <summary>
/// Macroo High-level implementation table entry.
/// </summary>
readonly struct TableEntry
{
/// <summary>
/// Name of the Macro function.
/// </summary>
public MacroHLEFunctionName Name { get; }
/// <summary>
/// Hash of the original binary Macro function code.
/// </summary>
public Hash128 Hash { get; }
/// <summary>
/// Size (in bytes) of the original binary Macro function code.
/// </summary>
public int Length { get; }
/// <summary>
/// Creates a new table entry.
/// </summary>
/// <param name="name">Name of the Macro function</param>
/// <param name="hash">Hash of the original binary Macro function code</param>
/// <param name="length">Size (in bytes) of the original binary Macro function code</param>
public TableEntry(MacroHLEFunctionName name, Hash128 hash, int length)
{
Name = name;
Hash = hash;
Length = length;
}
}
private static readonly TableEntry[] _table = new TableEntry[]
{
new TableEntry(MacroHLEFunctionName.ClearColor, new Hash128(0xA9FB28D1DC43645A, 0xB177E5D2EAE67FB0), 0x28),
new TableEntry(MacroHLEFunctionName.ClearDepthStencil, new Hash128(0x1B96CB77D4879F4F, 0x8557032FE0C965FB), 0x24),
new TableEntry(MacroHLEFunctionName.DrawArraysInstanced, new Hash128(0x197FB416269DBC26, 0x34288C01DDA82202), 0x48),
new TableEntry(MacroHLEFunctionName.DrawElementsInstanced, new Hash128(0x1A501FD3D54EC8E0, 0x6CF570CF79DA74D6), 0x5c),
new TableEntry(MacroHLEFunctionName.DrawElementsIndirect, new Hash128(0x86A3E8E903AF8F45, 0xD35BBA07C23860A4), 0x7c),
new TableEntry(MacroHLEFunctionName.MultiDrawElementsIndirectCount, new Hash128(0x890AF57ED3FB1C37, 0x35D0C95C61F5386F), 0x19C)
};
/// <summary>
/// Checks if the host supports all features required by the HLE macro.
/// </summary>
/// <param name="caps">Host capabilities</param>
/// <param name="name">Name of the HLE macro to be checked</param>
/// <returns>True if the host supports the HLE macro, false otherwise</returns>
private static bool IsMacroHLESupported(Capabilities caps, MacroHLEFunctionName name)
{
if (name == MacroHLEFunctionName.ClearColor ||
name == MacroHLEFunctionName.ClearDepthStencil ||
name == MacroHLEFunctionName.DrawArraysInstanced ||
name == MacroHLEFunctionName.DrawElementsInstanced ||
name == MacroHLEFunctionName.DrawElementsIndirect)
{
return true;
}
else if (name == MacroHLEFunctionName.MultiDrawElementsIndirectCount)
{
return caps.SupportsIndirectParameters;
}
return false;
}
/// <summary>
/// Checks if there's a fast, High-level implementation of the specified Macro code available.
/// </summary>
/// <param name="code">Macro code to be checked</param>
/// <param name="caps">Renderer capabilities to check for this macro HLE support</param>
/// <param name="name">Name of the function if a implementation is available and supported, otherwise <see cref="MacroHLEFunctionName.None"/></param>
/// <returns>True if there is a implementation available and supported, false otherwise</returns>
public static bool TryGetMacroHLEFunction(ReadOnlySpan<int> code, Capabilities caps, out MacroHLEFunctionName name)
{
var mc = MemoryMarshal.Cast<int, byte>(code);
for (int i = 0; i < _table.Length; i++)
{
ref var entry = ref _table[i];
var hash = XXHash128.ComputeHash(mc.Slice(0, entry.Length));
if (hash == entry.Hash)
{
if (IsMacroHLESupported(caps, entry.Name))
{
name = entry.Name;
return true;
}
break;
}
}
name = MacroHLEFunctionName.None;
return false;
}
}
}
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