Adding --max_draw_elements to make debugging easier for now.

src/xenia/gpu/d3d11/d3d11_buffer_resource.cc

@@ -9,6 +9,8 @@
 
 #include <xenia/gpu/d3d11/d3d11_buffer_resource.h>
 
+#include <algorithm>
+
 #include <xenia/gpu/gpu-private.h>
 #include <xenia/gpu/d3d11/d3d11_resource_cache.h>
 
@@ -131,6 +133,9 @@ int D3D11VertexBufferResource::InvalidateRegion(
   // TODO(benvanik): rewrite to be faster/special case common/etc
   uint32_t stride = info_.stride_words;
   size_t count = (memory_range_.length / 4) / stride;
+  if (FLAGS_max_draw_elements) {
+    count = std::min(FLAGS_max_draw_elements, count);
+  }
   for (size_t n = 0; n < info_.element_count; n++) {
     const auto& el = info_.elements[n];
     const uint32_t* src_ptr = (const uint32_t*)(

src/xenia/gpu/gpu-private.h

@@ -18,5 +18,7 @@ DECLARE_string(gpu);
 DECLARE_bool(trace_ring_buffer);
 DECLARE_string(dump_shaders);
 
+DECLARE_uint64(max_draw_elements);
+
 
 #endif  // XENIA_GPU_PRIVATE_H_

src/xenia/gpu/gpu.cc

@@ -19,6 +19,9 @@ DEFINE_bool(trace_ring_buffer, false, "Trace GPU ring buffer packets.");
 DEFINE_string(dump_shaders, "",
               "Path to write GPU shaders to as they are compiled.");
 
+DEFINE_uint64(max_draw_elements, 0,
+              "Maximum element count; anything over this is ignored.");
+
 #include <xenia/gpu/nop/nop_gpu.h>
 std::unique_ptr<GraphicsSystem> xe::gpu::CreateNop(Emulator* emulator) {
   return xe::gpu::nop::Create(emulator);