[D3D12] Triangle fan conversion (untested, only indexed and without cache)

src/xenia/gpu/d3d12/d3d12_command_processor.cc

@@ -623,6 +623,10 @@ bool D3D12CommandProcessor::SetupContext() {
     return false;
   }
 
+  primitive_converter_ = std::make_unique<PrimitiveConverter>(
+      context, register_file_, memory_, shared_memory_.get());
+  primitive_converter_->Initialize();
+
   D3D12_HEAP_PROPERTIES swap_texture_heap_properties = {};
   swap_texture_heap_properties.Type = D3D12_HEAP_TYPE_DEFAULT;
   D3D12_RESOURCE_DESC swap_texture_desc;
@@ -719,6 +723,8 @@ void D3D12CommandProcessor::ShutdownContext() {
   view_heap_pool_.reset();
   constant_buffer_pool_.reset();
 
+  primitive_converter_.reset();
+
   render_target_cache_.reset();
 
   texture_cache_.reset();
@@ -826,6 +832,8 @@ void D3D12CommandProcessor::PerformSwap(uint32_t frontbuffer_ptr,
     view_heap_pool_->ClearCache();
     constant_buffer_pool_->ClearCache();
 
+    primitive_converter_->ClearCache();
+
     render_target_cache_->ClearCache();
 
     texture_cache_->ClearCache();
@@ -945,8 +953,10 @@ bool D3D12CommandProcessor::IssueDraw(PrimitiveType primitive_type,
       render_target_cache_->GetCurrentPipelineRenderTargets();
 
   // Set the primitive topology.
+  PrimitiveType primitive_type_converted =
+      PrimitiveConverter::GetReplacementPrimitiveType(primitive_type);
   D3D_PRIMITIVE_TOPOLOGY primitive_topology;
-  switch (primitive_type) {
+  switch (primitive_type_converted) {
     case PrimitiveType::kPointList:
       primitive_topology = D3D_PRIMITIVE_TOPOLOGY_POINTLIST;
       break;
@@ -978,7 +988,7 @@ bool D3D12CommandProcessor::IssueDraw(PrimitiveType primitive_type,
   ID3D12PipelineState* pipeline;
   ID3D12RootSignature* root_signature;
   auto pipeline_status = pipeline_cache_->ConfigurePipeline(
-      vertex_shader, pixel_shader, primitive_type,
+      vertex_shader, pixel_shader, primitive_type_converted,
       indexed ? index_buffer_info->format : IndexFormat::kInt16,
       pipeline_render_targets, &pipeline, &root_signature);
   if (pipeline_status == PipelineCache::UpdateStatus::kError) {
@@ -1031,27 +1041,47 @@ bool D3D12CommandProcessor::IssueDraw(PrimitiveType primitive_type,
         regs[vfetch_constant_index + 1].u32 & 0x3FFFFFC);
     vertex_buffers_resident[vfetch_index >> 6] |= 1ull << (vfetch_index & 63);
   }
+
   if (indexed) {
-    uint32_t index_base = index_buffer_info->guest_base & 0x1FFFFFFF;
     uint32_t index_size = index_buffer_info->format == IndexFormat::kInt32
                               ? sizeof(uint32_t)
                               : sizeof(uint16_t);
-    index_base &= ~(index_size - 1);
+    assert_false(index_buffer_info->guest_base & (index_size - 1));
-    uint32_t index_buffer_size = index_buffer_info->count * index_size;
+    uint32_t index_base = index_buffer_info->guest_base & ~(index_size - 1);
-    shared_memory_->RequestRange(index_base, index_buffer_size);
-
-    shared_memory_->UseForReading();
     D3D12_INDEX_BUFFER_VIEW index_buffer_view;
-    index_buffer_view.BufferLocation =
-        shared_memory_->GetGPUAddress() + index_base;
-    index_buffer_view.SizeInBytes = index_buffer_size;
     index_buffer_view.Format = index_buffer_info->format == IndexFormat::kInt32
                                    ? DXGI_FORMAT_R32_UINT
                                    : DXGI_FORMAT_R16_UINT;
+    uint32_t converted_index_count;
+    PrimitiveConverter::ConversionResult conversion_result =
+        primitive_converter_->ConvertPrimitives(
+            primitive_type, index_buffer_info->guest_base,
+            index_buffer_info->count, index_buffer_info->format,
+            index_buffer_info->endianness, index_buffer_view.BufferLocation,
+            converted_index_count);
+    if (conversion_result == PrimitiveConverter::ConversionResult::kFailed) {
+      return false;
+    }
+    if (conversion_result ==
+        PrimitiveConverter::ConversionResult::kPrimitiveEmpty) {
+      return true;
+    }
+    if (conversion_result == PrimitiveConverter::ConversionResult::kConverted) {
+      index_buffer_view.SizeInBytes = converted_index_count * index_size;
+    } else {
+      uint32_t index_buffer_size = index_buffer_info->count * index_size;
+      shared_memory_->RequestRange(index_base, index_buffer_size);
+      index_buffer_view.BufferLocation =
+          shared_memory_->GetGPUAddress() + index_base;
+      index_buffer_view.SizeInBytes = index_buffer_size;
+    }
+    shared_memory_->UseForReading();
     command_list->IASetIndexBuffer(&index_buffer_view);
     SubmitBarriers();
     command_list->DrawIndexedInstanced(index_count, 1, 0, 0, 0);
   } else {
+    // TODO(Triang3l): Get a static index buffer for unsupported primitive types
+    // from the primitive converter.
     shared_memory_->UseForReading();
     SubmitBarriers();
     command_list->DrawInstanced(index_count, 1, 0, 0);
@@ -1134,6 +1164,8 @@ bool D3D12CommandProcessor::BeginFrame() {
 
   render_target_cache_->BeginFrame();
 
+  primitive_converter_->BeginFrame(GetCurrentCommandList());
+
   return true;
 }
 
@@ -1144,6 +1176,8 @@ bool D3D12CommandProcessor::EndFrame() {
 
   assert_false(scratch_buffer_used_);
 
+  primitive_converter_->EndFrame();
+
   render_target_cache_->EndFrame();
 
   shared_memory_->EndFrame();

src/xenia/gpu/d3d12/d3d12_command_processor.h

@@ -17,6 +17,7 @@
 #include "xenia/gpu/command_processor.h"
 #include "xenia/gpu/d3d12/d3d12_graphics_system.h"
 #include "xenia/gpu/d3d12/pipeline_cache.h"
+#include "xenia/gpu/d3d12/primitive_converter.h"
 #include "xenia/gpu/d3d12/render_target_cache.h"
 #include "xenia/gpu/d3d12/shared_memory.h"
 #include "xenia/gpu/d3d12/texture_cache.h"
@@ -210,6 +211,8 @@ class D3D12CommandProcessor : public CommandProcessor {
 
   std::unique_ptr<RenderTargetCache> render_target_cache_ = nullptr;
 
+  std::unique_ptr<PrimitiveConverter> primitive_converter_ = nullptr;
+
   std::unique_ptr<ui::d3d12::UploadBufferPool> constant_buffer_pool_ = nullptr;
   std::unique_ptr<ui::d3d12::DescriptorHeapPool> view_heap_pool_ = nullptr;
   std::unique_ptr<ui::d3d12::DescriptorHeapPool> sampler_heap_pool_ = nullptr;

src/xenia/gpu/d3d12/primitive_converter.cc

@@ -0,0 +1,199 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2018 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/gpu/d3d12/primitive_converter.h"
+
+#include "xenia/base/logging.h"
+#include "xenia/base/math.h"
+#include "xenia/base/platform.h"
+
+namespace xe {
+namespace gpu {
+namespace d3d12 {
+
+PrimitiveConverter::PrimitiveConverter(ui::d3d12::D3D12Context* context,
+                                       RegisterFile* register_file,
+                                       Memory* memory,
+                                       SharedMemory* shared_memory)
+    : context_(context),
+      register_file_(register_file),
+      memory_(memory),
+      shared_memory_(shared_memory) {}
+
+PrimitiveConverter::~PrimitiveConverter() { Shutdown(); }
+
+void PrimitiveConverter::Initialize() {
+  // There can be at most 65535 indices in a Xenos draw call, but they can be up
+  // to 4 bytes large, and conversion can add more indices (almost triple the
+  // count for triangle strips, for instance).
+  buffer_pool_ =
+      std::make_unique<ui::d3d12::UploadBufferPool>(context_, 4 * 1024 * 1024);
+}
+
+void PrimitiveConverter::Shutdown() { buffer_pool_.reset(); }
+
+void PrimitiveConverter::ClearCache() { buffer_pool_->ClearCache(); }
+
+void PrimitiveConverter::BeginFrame(ID3D12GraphicsCommandList* command_list) {
+  buffer_pool_->BeginFrame();
+  // TODO(Triang3l): Create the static index buffer for unindexed triangle fans.
+}
+
+void PrimitiveConverter::EndFrame() { buffer_pool_->EndFrame(); }
+
+PrimitiveType PrimitiveConverter::GetReplacementPrimitiveType(
+    PrimitiveType type) {
+  if (type == PrimitiveType::kTriangleFan) {
+    return PrimitiveType::kTriangleList;
+  }
+  return type;
+}
+
+PrimitiveConverter::ConversionResult PrimitiveConverter::ConvertPrimitives(
+    PrimitiveType source_type, uint32_t address, uint32_t index_count,
+    IndexFormat index_format, Endian index_endianness,
+    D3D12_GPU_VIRTUAL_ADDRESS& gpu_address_out, uint32_t& index_count_out) {
+  auto& regs = *register_file_;
+  bool reset = (regs[XE_GPU_REG_PA_SU_SC_MODE_CNTL].u32 & (1 << 21)) != 0;
+  // Swap the reset index because we will be comparing unswapped values to it.
+  uint32_t reset_index = xenos::GpuSwap(
+      regs[XE_GPU_REG_VGT_MULTI_PRIM_IB_RESET_INDX].u32, index_endianness);
+  // If the specified reset index is the same as the one used by Direct3D 12
+  // (0xFFFF or 0xFFFFFFFF - in the pipeline cache, we use the former for
+  // 16-bit and the latter for 32-bit indices), we can use the buffer directly.
+  uint32_t reset_index_host =
+      index_format == IndexFormat::kInt32 ? 0xFFFFFFFFu : 0xFFFFu;
+
+  // Check if need to convert at all.
+  if (source_type != PrimitiveType::kTriangleFan) {
+    if (!reset || reset_index == reset_index_host) {
+      return ConversionResult::kConversionNotNeeded;
+    }
+    if (source_type != PrimitiveType::kTriangleStrip ||
+        source_type != PrimitiveType::kLineStrip) {
+      return ConversionResult::kConversionNotNeeded;
+    }
+    // TODO(Triang3l): Write conversion for triangle and line strip reset index
+    // and for indexed line loops.
+    return ConversionResult::kConversionNotNeeded;
+  }
+
+  // Exit early for clearly empty draws, without even reading the memory.
+  if (source_type == PrimitiveType::kTriangleFan ||
+      source_type == PrimitiveType::kTriangleStrip) {
+    if (index_count < 3) {
+      return ConversionResult::kPrimitiveEmpty;
+    }
+  } else if (source_type == PrimitiveType::kLineStrip ||
+             source_type == PrimitiveType::kLineLoop) {
+    if (index_count < 2) {
+      return ConversionResult::kPrimitiveEmpty;
+    }
+  }
+
+  // TODO(Triang3l): Find the converted data in the cache.
+
+  // Calculate the index count, and also check if there's nothing to convert in
+  // the buffer (for instance, if not using primitive reset).
+  uint32_t converted_index_count = 0;
+  bool conversion_needed = false;
+  bool simd = false;
+  if (source_type == PrimitiveType::kTriangleFan) {
+    // Triangle fans are not supported by Direct3D 12 at all.
+    conversion_needed = true;
+    if (reset) {
+      // TODO(Triang3l): Triangle fans with primitive reset.
+      return ConversionResult::kFailed;
+    } else {
+      converted_index_count = 3 * (index_count - 2);
+    }
+  }
+
+  union {
+    void* source;
+    uint16_t* source_16;
+    uint32_t* source_32;
+  };
+  source = memory_->TranslatePhysical(address);
+  union {
+    void* target;
+    uint16_t* target_16;
+    uint32_t* target_32;
+  };
+  D3D12_GPU_VIRTUAL_ADDRESS gpu_address;
+  target = AllocateIndices(index_format, index_count, simd ? address & 15 : 0,
+                           gpu_address);
+  if (target == nullptr) {
+    return ConversionResult::kFailed;
+  }
+
+  if (source_type == PrimitiveType::kTriangleFan) {
+    // https://docs.microsoft.com/en-us/windows/desktop/direct3d9/triangle-fans
+    // Ordered as (v1, v2, v0), (v2, v3, v0).
+    if (reset) {
+      // TODO(Triang3l): Triangle fans with primitive restart.
+      return ConversionResult::kFailed;
+    } else {
+      if (index_format == IndexFormat::kInt32) {
+        for (uint32_t i = 2; i < index_count; ++i) {
+          *(target_32++) = source_32[i];
+          *(target_32++) = source_32[i - 1];
+          *(target_32++) = source_32[0];
+        }
+      } else {
+        for (uint32_t i = 2; i < index_count; ++i) {
+          *(target_16++) = source_16[i];
+          *(target_16++) = source_16[i - 1];
+          *(target_16++) = source_16[0];
+        }
+      }
+    }
+  }
+
+  // TODO(Triang3l): Replace primitive reset index in triangle and line strips.
+  // TODO(Triang3l): Line loops.
+
+  gpu_address_out = gpu_address;
+  index_count_out = converted_index_count;
+  return ConversionResult::kConverted;
+}
+
+void* PrimitiveConverter::AllocateIndices(
+    IndexFormat format, uint32_t count, uint32_t simd_offset,
+    D3D12_GPU_VIRTUAL_ADDRESS& gpu_address_out) {
+  if (count == 0) {
+    return nullptr;
+  }
+  uint32_t size = count * (format == IndexFormat::kInt32 ? sizeof(uint32_t)
+                                                         : sizeof(uint16_t));
+  // 16-align all index data because SIMD is used to replace the reset index
+  // (without that, 4-alignment would be required anyway to mix 16-bit and
+  // 32-bit indices in one buffer page).
+  size = xe::align(size, uint32_t(16));
+  // Add some space to align SIMD register components the same way in the source
+  // and the buffer.
+  simd_offset &= 15;
+  if (simd_offset != 0) {
+    size += 16;
+  }
+  D3D12_GPU_VIRTUAL_ADDRESS gpu_address;
+  uint8_t* mapping =
+      buffer_pool_->RequestFull(size, nullptr, nullptr, &gpu_address);
+  if (mapping == nullptr) {
+    XELOGE("Failed to allocate space for %u converted %u-bit vertex indices",
+           count, format == IndexFormat::kInt32 ? 32 : 16);
+    return nullptr;
+  }
+  gpu_address_out = gpu_address + simd_offset;
+  return mapping + simd_offset;
+}
+
+}  // namespace d3d12
+}  // namespace gpu
+}  // namespace xe

src/xenia/gpu/d3d12/primitive_converter.h

@@ -0,0 +1,108 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2018 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_GPU_D3D12_PRIMITIVE_CONVERTER_H_
+#define XENIA_GPU_D3D12_PRIMITIVE_CONVERTER_H_
+
+#include <atomic>
+#include <memory>
+#include <unordered_map>
+
+#include "xenia/gpu/d3d12/shared_memory.h"
+#include "xenia/gpu/register_file.h"
+#include "xenia/gpu/xenos.h"
+#include "xenia/memory.h"
+#include "xenia/ui/d3d12/d3d12_context.h"
+
+namespace xe {
+namespace gpu {
+namespace d3d12 {
+
+// Index buffer cache for primitive types not natively supported by Direct3D 12:
+// - Triangle and line strips with non-0xFFFF/0xFFFFFFFF reset index.
+// - Triangle fans.
+// - Line loops (only indexed ones - non-indexed are better handled in vertex
+//   shaders, otherwise a whole index buffer would have to be created for every
+//   vertex count value).
+class PrimitiveConverter {
+ public:
+  PrimitiveConverter(ui::d3d12::D3D12Context* context,
+                     RegisterFile* register_file, Memory* memory,
+                     SharedMemory* shared_memory);
+  ~PrimitiveConverter();
+
+  void Initialize();
+  void Shutdown();
+  void ClearCache();
+
+  void BeginFrame(ID3D12GraphicsCommandList* command_list);
+  void EndFrame();
+
+  // Returns the primitive type that the original type will be converted to.
+  static PrimitiveType GetReplacementPrimitiveType(PrimitiveType type);
+
+  enum class ConversionResult {
+    // Converted to a transient buffer.
+    kConverted,
+    // Conversion not required - use the index buffer in shared memory.
+    kConversionNotNeeded,
+    // No errors, but nothing to render.
+    kPrimitiveEmpty,
+    // Total failure of the draw call.
+    kFailed
+  };
+
+  // Converts an index buffer to the primitive type returned by
+  // GetReplacementPrimitiveType. If conversion has been performed, the returned
+  // buffer will be in the GENERIC_READ state (it's in an upload heap). Only
+  // writing to the outputs if returning kConverted. The restart index will be
+  // handled internally from the register values.
+  ConversionResult ConvertPrimitives(PrimitiveType source_type,
+                                     uint32_t address, uint32_t index_count,
+                                     IndexFormat index_format,
+                                     Endian index_endianness,
+                                     D3D12_GPU_VIRTUAL_ADDRESS& gpu_address_out,
+                                     uint32_t& index_count_out);
+
+  // TODO(Triang3l): A function that returns a static index buffer for
+  // non-indexed drawing of unsupported primitives
+
+ private:
+  // simd_offset is source address & 15 - if SIMD is used, the source and the
+  // target must have the same alignment within one register. 0 is optimal when
+  // not using SIMD.
+  void* AllocateIndices(IndexFormat format, uint32_t count,
+                        uint32_t simd_offset,
+                        D3D12_GPU_VIRTUAL_ADDRESS& gpu_address_out);
+
+  ui::d3d12::D3D12Context* context_;
+  RegisterFile* register_file_;
+  Memory* memory_;
+  SharedMemory* shared_memory_;
+
+  std::unique_ptr<ui::d3d12::UploadBufferPool> buffer_pool_ = nullptr;
+
+  struct ConvertedIndices {
+    D3D12_GPU_VIRTUAL_ADDRESS gpu_address;
+    PrimitiveType primitive_type;
+    uint32_t index_count;
+    IndexFormat index_format;
+    // Index pre-swapped - in guest storage endian.
+    uint32_t reset_index;
+    bool reset;
+  };
+  // Cache for a single frame.
+  std::unordered_multimap<uint32_t, ConvertedIndices> converted_indices_;
+};
+
+}  // namespace d3d12
+}  // namespace gpu
+}  // namespace xe
+
+#endif  // XENIA_GPU_D3D12_PRIMITIVE_CONVERTER_H_