Fix DrawArrays vertex buffer size (#4141)

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

@@ -142,6 +142,8 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
 
             _drawState.FirstIndex = firstIndex;
             _drawState.IndexCount = indexCount;
+            _drawState.DrawFirstVertex = drawFirstVertex;
+            _drawState.DrawVertexCount = drawVertexCount;
             _currentSpecState.SetHasConstantBufferDrawParameters(false);
 
             engine.UpdateState();
@@ -163,10 +165,8 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
 
                 _instancedIndexCount = ibCount != 0 ? ibCount : indexCount;
 
-                var drawState = _state.State.VertexBufferDrawState;
-
-                _instancedDrawStateFirst = drawState.First;
-                _instancedDrawStateCount = drawState.Count;
+                _instancedDrawStateFirst = drawFirstVertex;
+                _instancedDrawStateCount = drawVertexCount;
 
                 _drawState.DrawIndexed = false;
 
@@ -415,6 +415,7 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
             bool oldDrawIndexed = _drawState.DrawIndexed;
 
             _drawState.DrawIndexed = false;
+            engine.ForceStateDirty(VertexBufferFirstMethodOffset * 4);
 
             DrawEnd(engine, 0, 0, firstVertex, vertexCount);
 
@@ -526,8 +527,8 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
             }
             else
             {
-                _state.State.VertexBufferDrawState.First = firstVertex;
-                _state.State.VertexBufferDrawState.Count = count;
+                _drawState.DrawFirstVertex = firstVertex;
+                _drawState.DrawVertexCount = count;
                 engine.ForceStateDirty(VertexBufferFirstMethodOffset * 4);
             }
 

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

@@ -17,6 +17,16 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
         /// </summary>
         public int IndexCount;
 
+        /// <summary>
+        /// First vertex used on non-indexed draws. This value is stored somewhere else on indexed draws.
+        /// </summary>
+        public int DrawFirstVertex;
+
+        /// <summary>
+        /// Vertex count used on non-indexed draws. Indexed draws have a index count instead.
+        /// </summary>
+        public int DrawVertexCount;
+
         /// <summary>
         /// Indicates if the next draw will be a indexed draw.
         /// </summary>

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

@@ -989,6 +989,8 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
 
             bool drawIndexed = _drawState.DrawIndexed;
             bool drawIndirect = _drawState.DrawIndirect;
+            int drawFirstVertex = _drawState.DrawFirstVertex;
+            int drawVertexCount = _drawState.DrawVertexCount;
             uint vbEnableMask = 0;
 
             for (int index = 0; index < Constants.TotalVertexBuffers; index++)
@@ -1050,9 +1052,7 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
 
                     int firstInstance = (int)_state.State.FirstInstance;
 
-                    var drawState = _state.State.VertexBufferDrawState;
-
-                    size = Math.Min(vbSize, (ulong)((firstInstance + drawState.First + drawState.Count) * stride));
+                    size = Math.Min(vbSize, (ulong)((firstInstance + drawFirstVertex + drawVertexCount) * stride));
                 }
 
                 _pipeline.VertexBuffers[index] = new BufferPipelineDescriptor(_channel.MemoryManager.IsMapped(address), stride, divisor);