Use a new approach for shader BRX targets (#2532)

* Use a new approach for shader BRX targets

* Make shader cache actually work

* Improve the shader pattern matching a bit

* Extend LDC search to predecessor blocks, catches more cases

* Nit

* Only save the amount of constant buffer data actually used. Avoids crashes on partially mapped buffers

* Ignore Rd on predicate instructions, as they do not have a Rd register (catches more cases)

Ryujinx.Graphics.Gpu/Shader/GpuAccessor.cs

@@ -20,6 +20,8 @@ namespace Ryujinx.Graphics.Gpu.Shader
         private readonly int _localMemorySize;
         private readonly int _sharedMemorySize;
 
+        public int Cb1DataSize { get; private set; }
+
         /// <summary>
         /// Creates a new instance of the GPU state accessor for graphics shader translation.
         /// </summary>
@@ -67,6 +69,25 @@ namespace Ryujinx.Graphics.Gpu.Shader
             _sharedMemorySize = sharedMemorySize;
         }
 
+        /// <summary>
+        /// Reads data from the constant buffer 1.
+        /// </summary>
+        /// <param name="offset">Offset in bytes to read from</param>
+        /// <returns>Value at the given offset</returns>
+        public uint ConstantBuffer1Read(int offset)
+        {
+            if (Cb1DataSize < offset + 4)
+            {
+                Cb1DataSize = offset + 4;
+            }
+
+            ulong baseAddress = _compute
+                ? _channel.BufferManager.GetComputeUniformBufferAddress(1)
+                : _channel.BufferManager.GetGraphicsUniformBufferAddress(_stageIndex, 1);
+
+            return _channel.MemoryManager.Physical.Read<uint>(baseAddress + (ulong)offset);
+        }
+
         /// <summary>
         /// Prints a log message.
         /// </summary>