Code to load the software renderer and initialize it. Build scripts copy the ...

core/win/d3d9/renderer_d3d9.cc

Index: core/win/d3d9/renderer_d3d9.cc
===================================================================
--- core/win/d3d9/renderer_d3d9.cc	(revision 19033)
+++ core/win/d3d9/renderer_d3d9.cc	(working copy)
@@ -54,6 +54,7 @@
 #include "core/win/d3d9/primitive_d3d9.h"
 #include "core/win/d3d9/render_surface_d3d9.h"
 #include "core/win/d3d9/sampler_d3d9.h"
+#include "core/win/d3d9/software_renderer_d3d9.h"
 #include "core/win/d3d9/stream_bank_d3d9.h"
 #include "core/win/d3d9/texture_d3d9.h"
 #include "core/win/d3d9/utils_d3d9.h"
@@ -297,7 +298,7 @@
           << " for depth/stencil buffers.";
       return false;
     }
-  }  
+  }
 
   return true;
 }
@@ -329,11 +330,11 @@
 // For certain GPU drivers we need to force anti-aliasing off to avoid a
 // a huge performance hit when certain types of windows are used on the same
 // desktop as O3D. This function returns true if O3D is running on one
-// of these GPUs/Drivers.  
+// of these GPUs/Drivers.
 bool ForceAntiAliasingOff(LPDIRECT3D9* d3d) {
   D3DADAPTER_IDENTIFIER9 identifier;
   HRESULT hr = (*d3d)->GetAdapterIdentifier(D3DADAPTER_DEFAULT, 0, &identifier);
-  
+
   unsigned int vendor_id = identifier.VendorId;
   unsigned int device_id = identifier.DeviceId;
   unsigned int product = HIWORD(identifier.DriverVersion.HighPart);
@@ -345,15 +346,47 @@
   if (vendor_id == 4098 &&   // ATI
       product == 6 &&
       version == 14 &&
-      subversion == 10 && 
+      subversion == 10 &&
       build <= 6800) {
     return true;
-  } 
+  }
 
   return false;
 }
 
+namespace {
+// Returns whether the ForceSoftwareRenderer value of the Software\Google\o3d
+// key is non-zero.
+bool IsForceSoftwareRendererEnabled() {
+  HKEY key;
+  if (FAILED(RegOpenKeyEx(HKEY_CURRENT_USER,
+                          TEXT("Software\\Google\\o3d"),
+                          0,
+                          KEY_READ,
+                          &key))) {
+    return false;
+  }
+  
+  bool enabled = false;
+  DWORD type;
+  DWORD value;
+  DWORD size = sizeof(value);
+  if (SUCCEEDED(RegQueryValueEx(key,
+                                TEXT("ForceSoftwareRenderer"),
+                                NULL,
+                                &type,
+                                reinterpret_cast<LPBYTE>(&value),
+                                &size))) {
+    if (type == REG_DWORD && size == sizeof(value) && value) {
+      enabled = true;
+    }
+  }
+  RegCloseKey(key);
 
+  return enabled;
+}
+}
+
 // Helper function that gets the D3D Interface, checks the available
 // multisampling modes and selects the most advanced one available to create
 // a D3D Device with a back buffer containing depth and stencil buffers that
@@ -368,9 +401,17 @@
     int* out_width,
     int* out_height) {
 
-  // Try the hardware renderer first.
-  Renderer::InitStatus status_hardware = CreateDirect3D(
-      Direct3DCreate9, d3d, features);
+  // Check registry to see if the developer has opted to force the software
+  // renderer.
+  Renderer::InitStatus status_hardware;
+  if (IsForceSoftwareRendererEnabled()) {
+    // Simulate GPU not up to spec.
+    status_hardware = Renderer::GPU_NOT_UP_TO_SPEC;
+  } else {
+    // Create a hardware device.
+    status_hardware = CreateDirect3D(Direct3DCreate9, d3d, features);
+  }
+  
   if (status_hardware != Renderer::SUCCESS) {
     Renderer::InitStatus status_software = CreateDirect3D(
         Direct3DCreate9Software, d3d, features);
@@ -387,6 +428,8 @@
       }
       return status_hardware;
     }
+
+    SetupSoftwareRenderer(*d3d);
   }
 
   D3DDISPLAYMODE d3ddm;
@@ -394,7 +437,7 @@
     return Renderer::GPU_NOT_UP_TO_SPEC;
 
   // NOTE: make sure the backbuffer matches this format, as it is
-  // currently currently assumed to be 32-bit 8X8R8G8B
+  // currently assumed to be 32-bit 8X8R8G8B
 
   ZeroMemory(d3d_present_parameters, sizeof(*d3d_present_parameters));
   d3d_present_parameters->Windowed               = !fullscreen;