From 5f97031df5eb3347101f897938a4be6aae6392c5 Mon Sep 17 00:00:00 2001
From: jute-ado <304153664+jute-ado@users.noreply.github.com>
Date: Wed, 22 Jul 2026 13:46:15 +0200
Subject: [PATCH] shader: allow larger bounded Gen5 programs (#514)

---
 .../Gen5ShaderTranslator.cs                   |  2 +-
 .../Agc/Gen5ShaderDecoderBoundaryTests.cs     | 20 ++++++++++++++++++-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/src/SharpEmu.ShaderCompiler/Gen5ShaderTranslator.cs b/src/SharpEmu.ShaderCompiler/Gen5ShaderTranslator.cs
index 7c33629..137a8b1 100644
--- a/src/SharpEmu.ShaderCompiler/Gen5ShaderTranslator.cs
+++ b/src/SharpEmu.ShaderCompiler/Gen5ShaderTranslator.cs
@@ -80,7 +80,7 @@ public static class Gen5ShaderTranslator
     public static bool IsScalarConsumed(ulong[] mask, uint register) =>
         register < 256 && (mask[register >> 6] & (1UL << (int)(register & 63))) != 0;
 
-    private const int MaxInstructions = 4096;
+    private const int MaxInstructions = 16384;
     private const uint PsUserDataRegister = 0x0C;
     private const uint VsUserDataRegister = 0x4C;
     private const uint GsUserDataRegister = 0x8C;
diff --git a/tests/SharpEmu.Libs.Tests/Agc/Gen5ShaderDecoderBoundaryTests.cs b/tests/SharpEmu.Libs.Tests/Agc/Gen5ShaderDecoderBoundaryTests.cs
index 6ad5c98..1c316bc 100644
--- a/tests/SharpEmu.Libs.Tests/Agc/Gen5ShaderDecoderBoundaryTests.cs
+++ b/tests/SharpEmu.Libs.Tests/Agc/Gen5ShaderDecoderBoundaryTests.cs
@@ -13,7 +13,8 @@ public sealed class Gen5ShaderDecoderBoundaryTests
     private const ulong ShaderAddress = 0x1_0000_0000;
     private const uint Export = 0xF8000000;
     private const uint Nop = 0xBF800000;
-    private const int MaximumInstructionCount = 4096;
+    private const uint EndPgm = 0xBF810000;
+    private const int MaximumInstructionCount = 16384;
 
     [Fact]
     public void MissingAddress_IsRejectedWithoutReadingGuestMemory()
@@ -99,6 +100,23 @@ public sealed class Gen5ShaderDecoderBoundaryTests
             memory.Reads[^1]);
     }
 
+    [Fact]
+    public void ProgramMayEndAfterPreviousDecoderLimit()
+    {
+        const int previousDecoderLimit = 4096;
+        var words = new uint[previousDecoderLimit + 1];
+        Array.Fill(words, Nop);
+        words[^1] = EndPgm;
+        var memory = RecordingCpuMemory.FromWords(ShaderAddress, words);
+
+        var decoded = Decode(memory, ShaderAddress, out var program, out var error);
+
+        Assert.True(decoded, error);
+        Assert.Equal(words.Length, program.Instructions.Count);
+        Assert.Equal("SEndpgm", program.Instructions[^1].Opcode);
+        Assert.Equal(words.Length, memory.Reads.Count);
+    }
+
     private static bool Decode(
         RecordingCpuMemory memory,
         ulong address,