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[AGC] Emit packets with one write and read the buffer state at once

This commit is contained in:
ParantezTech 2026-10-11 01:41:05 +03:00
parent 8c24a40bfa
commit 9b552ffb72
1 changed files with 30 additions and 5 deletions
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35
src/SharpEmu.Libs/Agc/AgcExports.cs
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@ -491,15 +491,40 @@ public static partial class AgcExports
private static bool TryAllocateCommandDwords(CpuContext ctx, ulong commandBufferAddress, uint sizeDwords, out ulong commandAddress)
=> TryPrepareCommandDwords(ctx, commandBufferAddress, sizeDwords, true, out commandAddress);
private static bool TryEmitCommandDwords(CpuContext ctx, ulong commandBufferAddress, out ulong commandAddress, params ReadOnlySpan<uint> dwords)
{
return TryAllocateCommandDwords(ctx, commandBufferAddress, (uint)dwords.Length, out commandAddress) &&
TryWriteCommandDwords(ctx, commandAddress, dwords);
}
private static bool TryWriteCommandDwords(CpuContext ctx, ulong address, params ReadOnlySpan<uint> dwords) =>
ctx.Memory.TryWrite(address, System.Runtime.InteropServices.MemoryMarshal.AsBytes(dwords));
private const int CommandBufferStateBytes = (int)(CommandBufferReservedDwOffset + sizeof(uint) - CommandBufferCursorUpOffset);
private static bool TryReadCommandBufferState(CpuContext ctx, ulong commandBufferAddress, out ulong cursorUp, out ulong cursorDown, out ulong callback, out ulong userData, out uint reservedDwords)
{
Span<byte> state = stackalloc byte[CommandBufferStateBytes];
if (!ctx.Memory.TryRead(commandBufferAddress + CommandBufferCursorUpOffset, state))
{
cursorUp = cursorDown = callback = userData = 0;
reservedDwords = 0;
return false;
}
cursorUp = BinaryPrimitives.ReadUInt64LittleEndian(state);
cursorDown = BinaryPrimitives.ReadUInt64LittleEndian(state[(int)(CommandBufferCursorDownOffset - CommandBufferCursorUpOffset)..]);
callback = BinaryPrimitives.ReadUInt64LittleEndian(state[(int)(CommandBufferCallbackOffset - CommandBufferCursorUpOffset)..]);
userData = BinaryPrimitives.ReadUInt64LittleEndian(state[(int)(CommandBufferUserDataOffset - CommandBufferCursorUpOffset)..]);
reservedDwords = BinaryPrimitives.ReadUInt32LittleEndian(state[(int)(CommandBufferReservedDwOffset - CommandBufferCursorUpOffset)..]);
return true;
}
private static bool TryPrepareCommandDwords(CpuContext ctx, ulong commandBufferAddress, uint sizeDwords, bool advanceCursor, out ulong commandAddress)
{
commandAddress = 0;
if (sizeDwords == 0 ||
!TryReadUInt64(ctx, commandBufferAddress + CommandBufferCursorUpOffset, out var cursorUp) ||
!TryReadUInt64(ctx, commandBufferAddress + CommandBufferCursorDownOffset, out var cursorDown) ||
!TryReadUInt64(ctx, commandBufferAddress + CommandBufferCallbackOffset, out var callback) ||
!TryReadUInt64(ctx, commandBufferAddress + CommandBufferUserDataOffset, out var userData) ||
!TryReadUInt32(ctx, commandBufferAddress + CommandBufferReservedDwOffset, out var reservedDwords))
!TryReadCommandBufferState(ctx, commandBufferAddress, out var cursorUp, out var cursorDown, out var callback, out var userData, out var reservedDwords))
{
return false;
}