From 77b15d156d7497981d2f1c406b3124329b763baf Mon Sep 17 00:00:00 2001
From: Connor McLaughlin <mclaughc@outlook.com>
Date: Sat, 14 Sep 2019 23:49:55 +1000
Subject: [PATCH] System: Periodically flush GPU

Needs real timings...
---
 src/pse/gpu.cpp    | 16 ++++++++++++++--
 src/pse/gpu.h      |  2 ++
 src/pse/system.cpp |  8 +++++++-
 3 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/src/pse/gpu.cpp b/src/pse/gpu.cpp
index 4fb27c4cb..d54d93bb0 100644
--- a/src/pse/gpu.cpp
+++ b/src/pse/gpu.cpp
@@ -178,6 +178,12 @@ void GPU::DMAWrite(u32 value)
   }
 }
 
+void GPU::Flush()
+{
+  FlushRender();
+  UpdateDisplay();
+}
+
 u32 GPU::ReadGPUREAD()
 {
   if (m_GPUREAD_buffer.empty())
@@ -312,6 +318,14 @@ void GPU::WriteGP1(u32 value)
   const u32 param = value & UINT32_C(0x00FFFFFF);
   switch (command)
   {
+    case 0x01: // Clear FIFO
+    {
+      m_GP0_command.clear();
+      Log_DebugPrintf("GP1 clear FIFO");
+      UpdateGPUSTAT();
+    }
+    break;
+
     case 0x04: // DMA Direction
     {
       m_GPUSTAT.dma_direction = static_cast<DMADirection>(param);
@@ -409,8 +423,6 @@ bool GPU::HandleRenderCommand()
                   ZeroExtend32(words_per_vertex));
 
   DispatchRenderCommand(rc, num_vertices);
-  //FlushRender();
-  //UpdateDisplay();
   return true;
 }
 
diff --git a/src/pse/gpu.h b/src/pse/gpu.h
index 5dac6f547..b9b054adc 100644
--- a/src/pse/gpu.h
+++ b/src/pse/gpu.h
@@ -31,6 +31,8 @@ public:
   // gpu_hw_opengl.cpp
   static std::unique_ptr<GPU> CreateHardwareOpenGLRenderer();
 
+  void Flush();
+
 protected:
   static constexpr u32 VRAM_WIDTH = 1024;
   static constexpr u32 VRAM_HEIGHT = 512;
diff --git a/src/pse/system.cpp b/src/pse/system.cpp
index 2b9044879..8348eaa7a 100644
--- a/src/pse/system.cpp
+++ b/src/pse/system.cpp
@@ -75,8 +75,14 @@ bool System::SaveState(ByteStream* state)
 void System::RunFrame()
 {
   u32 current_frame_number = m_frame_number;
-  while (current_frame_number == m_frame_number)
+  u32 ticks = 0;
+  while (current_frame_number == m_frame_number && ticks < (44100 * 300))
+  {
     m_cpu->Execute();
+    ticks++;
+  }
+
+  m_gpu->Flush();
 }
 
 bool System::LoadEXE(const char* filename)