[D3D12] d3d12_break_on_error + fix PerformSwap descriptor heap wrap

src/xenia/gpu/d3d12/texture_cache.h

@@ -159,9 +159,12 @@ class TextureCache {
                                        uint32_t first_unscaled_4kb_page,
                                        uint32_t unscaled_4kb_page_count);
 
-  // Returns a descriptor of the front buffer in PIXEL_SHADER_RESOURCE state.
-  bool RequestSwapTexture(D3D12_CPU_DESCRIPTOR_HANDLE handle,
-                          TextureFormat& format_out);
+  // Returns the ID3D12Resource of the front buffer texture (in
+  // PIXEL_SHADER_RESOURCE state), or nullptr in case of failure, and writes the
+  // description of its SRV. May call LoadTextureData, so the same restrictions
+  // (such as about descriptor heap change possibility) apply.
+  ID3D12Resource* RequestSwapTexture(
+      D3D12_SHADER_RESOURCE_VIEW_DESC& srv_desc_out, TextureFormat& format_out);
 
  private:
   enum class LoadMode {