From cc12f0b96a08f29b73b90712b132000536ab7ac8 Mon Sep 17 00:00:00 2001
From: Ben Vanik <ben.vanik@gmail.com>
Date: Sun, 13 Oct 2013 11:06:13 -0700
Subject: [PATCH] Periodically fire interrupts.

---
 src/xenia/gpu/d3d11/d3d11_graphics_system.cc | 5 +++++
 src/xenia/gpu/graphics_system.cc             | 7 +++++--
 src/xenia/gpu/graphics_system.h              | 1 +
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/xenia/gpu/d3d11/d3d11_graphics_system.cc b/src/xenia/gpu/d3d11/d3d11_graphics_system.cc
index d3266f440..bb79b156c 100644
--- a/src/xenia/gpu/d3d11/d3d11_graphics_system.cc
+++ b/src/xenia/gpu/d3d11/d3d11_graphics_system.cc
@@ -130,6 +130,11 @@ void D3D11GraphicsSystem::Pump() {
 
     // Dispatch interrupt callback to let the game know it can keep drawing.
     DispatchInterruptCallback();
+  } else {
+    // If we have gone too long without an interrupt, fire one.
+    if (xe_pal_now() - last_interrupt_time_ > 16 / 1000.0) {
+      DispatchInterruptCallback();
+    }
   }
 }
 
diff --git a/src/xenia/gpu/graphics_system.cc b/src/xenia/gpu/graphics_system.cc
index 00d9e76a7..d3813657b 100644
--- a/src/xenia/gpu/graphics_system.cc
+++ b/src/xenia/gpu/graphics_system.cc
@@ -22,7 +22,7 @@ using namespace xe::gpu::xenos;
 
 GraphicsSystem::GraphicsSystem(const CreationParams* params) :
     interrupt_callback_(0), interrupt_callback_data_(0),
-    swap_pending_(false) {
+    last_interrupt_time_(0), swap_pending_(false) {
   memory_ = xe_memory_retain(params->memory);
 
   worker_ = new RingBufferWorker(memory_);
@@ -147,15 +147,18 @@ void GraphicsSystem::WriteRegister(uint32_t r, uint64_t value) {
     case 0x0714: // CP_RB_WPTR
       worker_->UpdateWritePointer((uint32_t)value);
       break;
+    default:
+      XELOGW("Unknown GPU register %.4X write: %.8X", r, value);
+      break;
   }
 
   XEASSERT(r >= 0 && r < kXEGpuRegisterCount);
-  XELOGW("Unknown GPU register %.4X write: %.8X", r, value);
   regs->values[r].u32 = (uint32_t)value;
 }
 
 void GraphicsSystem::DispatchInterruptCallback() {
   // NOTE: we may be executing in some random thread.
+  last_interrupt_time_ = xe_pal_now();
   if (!interrupt_callback_) {
     return;
   }
diff --git a/src/xenia/gpu/graphics_system.h b/src/xenia/gpu/graphics_system.h
index 6491461f8..670676523 100644
--- a/src/xenia/gpu/graphics_system.h
+++ b/src/xenia/gpu/graphics_system.h
@@ -93,6 +93,7 @@ protected:
 
   uint32_t          interrupt_callback_;
   uint32_t          interrupt_callback_data_;
+  double            last_interrupt_time_;
   bool              swap_pending_;
 };