Separate GPU engines (part 2/2) (#2440)

* 3D engine now uses DeviceState too, plus new state modification tracking

* Remove old methods code

* Remove GpuState and friends

* Optimize DeviceState, force inline some functions

* This change was not supposed to go in

* Proper channel initialization

* Optimize state read/write methods even more

* Fix debug build

* Do not dirty state if the write is redundant

* The YControl register should dirty either the viewport or front face state too, to update the host origin

* Avoid redundant vertex buffer updates

* Move state and get rid of the Ryujinx.Graphics.Gpu.State namespace

* Comments and nits

* Fix rebase

* PR feedback

* Move changed = false to improve codegen

* PR feedback

* Carry RyuJIT a bit more

Ryujinx.Graphics.Gpu/Engine/Threed/SemaphoreUpdater.cs

@@ -0,0 +1,222 @@
+using Ryujinx.Common;
+using Ryujinx.Graphics.GAL;
+
+namespace Ryujinx.Graphics.Gpu.Engine.Threed
+{
+    /// <summary>
+    /// Semaphore updater.
+    /// </summary>
+    class SemaphoreUpdater
+    {
+        private const int NsToTicksFractionNumerator = 384;
+        private const int NsToTicksFractionDenominator = 625;
+
+        /// <summary>
+        /// GPU semaphore operation.
+        /// </summary>
+        private enum SemaphoreOperation
+        {
+            Release = 0,
+            Acquire = 1,
+            Counter = 2
+        }
+
+        /// <summary>
+        /// Counter type for GPU counter reset.
+        /// </summary>
+        private enum ResetCounterType
+        {
+            SamplesPassed = 1,
+            ZcullStats = 2,
+            TransformFeedbackPrimitivesWritten = 0x10,
+            InputVertices = 0x12,
+            InputPrimitives = 0x13,
+            VertexShaderInvocations = 0x15,
+            TessControlShaderInvocations = 0x16,
+            TessEvaluationShaderInvocations = 0x17,
+            TessEvaluationShaderPrimitives = 0x18,
+            GeometryShaderInvocations = 0x1a,
+            GeometryShaderPrimitives = 0x1b,
+            ClipperInputPrimitives = 0x1c,
+            ClipperOutputPrimitives = 0x1d,
+            FragmentShaderInvocations = 0x1e,
+            PrimitivesGenerated = 0x1f
+        }
+
+        /// <summary>
+        /// Counter type for GPU counter reporting.
+        /// </summary>
+        private enum ReportCounterType
+        {
+            Zero = 0,
+            InputVertices = 1,
+            InputPrimitives = 3,
+            VertexShaderInvocations = 5,
+            GeometryShaderInvocations = 7,
+            GeometryShaderPrimitives = 9,
+            ZcullStats0 = 0xa,
+            TransformFeedbackPrimitivesWritten = 0xb,
+            ZcullStats1 = 0xc,
+            ZcullStats2 = 0xe,
+            ClipperInputPrimitives = 0xf,
+            ZcullStats3 = 0x10,
+            ClipperOutputPrimitives = 0x11,
+            PrimitivesGenerated = 0x12,
+            FragmentShaderInvocations = 0x13,
+            SamplesPassed = 0x15,
+            TransformFeedbackOffset = 0x1a,
+            TessControlShaderInvocations = 0x1b,
+            TessEvaluationShaderInvocations = 0x1d,
+            TessEvaluationShaderPrimitives = 0x1f
+        }
+
+        private readonly GpuContext _context;
+        private readonly GpuChannel _channel;
+        private readonly DeviceStateWithShadow<ThreedClassState> _state;
+
+        /// <summary>
+        /// Creates a new instance of the semaphore updater.
+        /// </summary>
+        /// <param name="context">GPU context</param>
+        /// <param name="channel">GPU channel</param>
+        /// <param name="state">Channel state</param>
+        public SemaphoreUpdater(GpuContext context, GpuChannel channel, DeviceStateWithShadow<ThreedClassState> state)
+        {
+            _context = context;
+            _channel = channel;
+            _state = state;
+        }
+
+        /// <summary>
+        /// Resets the value of an internal GPU counter back to zero.
+        /// </summary>
+        /// <param name="argument">Method call argument</param>
+        public void ResetCounter(int argument)
+        {
+            ResetCounterType type = (ResetCounterType)argument;
+
+            switch (type)
+            {
+                case ResetCounterType.SamplesPassed:
+                    _context.Renderer.ResetCounter(CounterType.SamplesPassed);
+                    break;
+                case ResetCounterType.PrimitivesGenerated:
+                    _context.Renderer.ResetCounter(CounterType.PrimitivesGenerated);
+                    break;
+                case ResetCounterType.TransformFeedbackPrimitivesWritten:
+                    _context.Renderer.ResetCounter(CounterType.TransformFeedbackPrimitivesWritten);
+                    break;
+            }
+        }
+
+        /// <summary>
+        /// Writes a GPU counter to guest memory.
+        /// </summary>
+        /// <param name="argument">Method call argument</param>
+        public void Report(int argument)
+        {
+            SemaphoreOperation op = (SemaphoreOperation)(argument & 3);
+            ReportCounterType type = (ReportCounterType)((argument >> 23) & 0x1f);
+
+            switch (op)
+            {
+                case SemaphoreOperation.Release: ReleaseSemaphore(); break;
+                case SemaphoreOperation.Counter: ReportCounter(type); break;
+            }
+        }
+
+        /// <summary>
+        /// Writes (or Releases) a GPU semaphore value to guest memory.
+        /// </summary>
+        private void ReleaseSemaphore()
+        {
+            _channel.MemoryManager.Write(_state.State.SemaphoreAddress.Pack(), _state.State.SemaphorePayload);
+
+            _context.AdvanceSequence();
+        }
+
+        /// <summary>
+        /// Packed GPU counter data (including GPU timestamp) in memory.
+        /// </summary>
+        private struct CounterData
+        {
+            public ulong Counter;
+            public ulong Timestamp;
+        }
+
+        /// <summary>
+        /// Writes a GPU counter to guest memory.
+        /// This also writes the current timestamp value.
+        /// </summary>
+        /// <param name="type">Counter to be written to memory</param>
+        private void ReportCounter(ReportCounterType type)
+        {
+            ulong gpuVa = _state.State.SemaphoreAddress.Pack();
+
+            ulong ticks = ConvertNanosecondsToTicks((ulong)PerformanceCounter.ElapsedNanoseconds);
+
+            if (GraphicsConfig.FastGpuTime)
+            {
+                // Divide by some amount to report time as if operations were performed faster than they really are.
+                // This can prevent some games from switching to a lower resolution because rendering is too slow.
+                ticks /= 256;
+            }
+
+            ICounterEvent counter = null;
+
+            void resultHandler(object evt, ulong result)
+            {
+                CounterData counterData = new CounterData
+                {
+                    Counter = result,
+                    Timestamp = ticks
+                };
+
+                if (counter?.Invalid != true)
+                {
+                    _channel.MemoryManager.Write(gpuVa, counterData);
+                }
+            }
+
+            switch (type)
+            {
+                case ReportCounterType.Zero:
+                    resultHandler(null, 0);
+                    break;
+                case ReportCounterType.SamplesPassed:
+                    counter = _context.Renderer.ReportCounter(CounterType.SamplesPassed, resultHandler);
+                    break;
+                case ReportCounterType.PrimitivesGenerated:
+                    counter = _context.Renderer.ReportCounter(CounterType.PrimitivesGenerated, resultHandler);
+                    break;
+                case ReportCounterType.TransformFeedbackPrimitivesWritten:
+                    counter = _context.Renderer.ReportCounter(CounterType.TransformFeedbackPrimitivesWritten, resultHandler);
+                    break;
+            }
+
+            _channel.MemoryManager.CounterCache.AddOrUpdate(gpuVa, counter);
+        }
+
+        /// <summary>
+        /// Converts a nanoseconds timestamp value to Maxwell time ticks.
+        /// </summary>
+        /// <remarks>
+        /// The frequency is 614400000 Hz.
+        /// </remarks>
+        /// <param name="nanoseconds">Timestamp in nanoseconds</param>
+        /// <returns>Maxwell ticks</returns>
+        private static ulong ConvertNanosecondsToTicks(ulong nanoseconds)
+        {
+            // We need to divide first to avoid overflows.
+            // We fix up the result later by calculating the difference and adding
+            // that to the result.
+            ulong divided = nanoseconds / NsToTicksFractionDenominator;
+
+            ulong rounded = divided * NsToTicksFractionDenominator;
+
+            ulong errorBias = (nanoseconds - rounded) * NsToTicksFractionNumerator / NsToTicksFractionDenominator;
+
+            return divided * NsToTicksFractionNumerator + errorBias;
+        }
+    }
+}