kc3-lang/angle/src/libGLESv2/renderer/InputLayoutCache.cpp

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• Author : shannon.woods@transgaming.com
  Date : 2013-01-25 21:56:30
  Hash : 00032cb2
  Message : Implement instancing support in D3D11. TRAC #22414 Signed-off-by: Geoff Lang Signed-off-by: Nicolas Capens Author: Jamie Madill git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1791 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/libGLESv2/renderer/InputLayoutCache.cpp

• //
  // Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // InputLayoutCache.cpp: Defines InputLayoutCache, a class that builds and caches
  // D3D11 input layouts.
  
  #include "libGLESv2/renderer/InputLayoutCache.h"
  #include "libGLESv2/renderer/VertexBuffer11.h"
  #include "libGLESv2/renderer/ShaderExecutable11.h"
  #include "libGLESv2/ProgramBinary.h"
  
  #include "third_party/murmurhash/MurmurHash3.h"
  
  namespace rx
  {
  
  const unsigned int InputLayoutCache::kMaxInputLayouts = 1024;
  
  InputLayoutCache::InputLayoutCache() : mInputLayoutMap(kMaxInputLayouts, hashInputLayout, compareInputLayouts)
  {
      mCounter = 0;
      mDevice = NULL;
      mDeviceContext = NULL;
  }
  
  InputLayoutCache::~InputLayoutCache()
  {
      clear();
  }
  
  void InputLayoutCache::initialize(ID3D11Device *device, ID3D11DeviceContext *context)
  {
      clear();
      mDevice = device;
      mDeviceContext = context;
  }
  
  void InputLayoutCache::clear()
  {
      for (InputLayoutMap::iterator i = mInputLayoutMap.begin(); i != mInputLayoutMap.end(); i++)
      {
          i->second.inputLayout->Release();
      }
      mInputLayoutMap.clear();
  }
  
  GLenum InputLayoutCache::applyVertexBuffers(TranslatedAttribute attributes[gl::MAX_VERTEX_ATTRIBS],
                                              gl::ProgramBinary *programBinary)
  {
      if (!mDevice || !mDeviceContext)
      {
          ERR("InputLayoutCache is not initialized.");
          return GL_INVALID_OPERATION;
      }
  
      InputLayoutKey ilKey = { 0 };
  
      ID3D11Buffer *vertexBuffers[gl::MAX_VERTEX_ATTRIBS] = { NULL };
      UINT vertexStrides[gl::MAX_VERTEX_ATTRIBS] = { 0 };
      UINT vertexOffsets[gl::MAX_VERTEX_ATTRIBS] = { 0 };
  
      static const char* semanticName = "TEXCOORD";
  
      for (unsigned int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
      {
          if (attributes[i].active)
          {
              VertexBuffer11 *vertexBuffer = VertexBuffer11::makeVertexBuffer11(attributes[i].vertexBuffer);
  
              D3D11_INPUT_CLASSIFICATION inputClass = attributes[i].divisor > 0 ? D3D11_INPUT_PER_INSTANCE_DATA : D3D11_INPUT_PER_VERTEX_DATA;
  
              ilKey.elements[ilKey.elementCount].SemanticName = semanticName;
              ilKey.elements[ilKey.elementCount].SemanticIndex = programBinary->getSemanticIndex(i);
              ilKey.elements[ilKey.elementCount].Format = attributes[i].attribute->mArrayEnabled ? vertexBuffer->getDXGIFormat(*attributes[i].attribute) : DXGI_FORMAT_R32G32B32A32_FLOAT;
              ilKey.elements[ilKey.elementCount].InputSlot = i;
              ilKey.elements[ilKey.elementCount].AlignedByteOffset = 0;
              ilKey.elements[ilKey.elementCount].InputSlotClass = inputClass;
              ilKey.elements[ilKey.elementCount].InstanceDataStepRate = attributes[i].divisor;
              ilKey.elementCount++;
  
              vertexBuffers[i] = vertexBuffer->getBuffer();
              vertexStrides[i] = attributes[i].stride;
              vertexOffsets[i] = attributes[i].offset;
          }
      }
  
      ID3D11InputLayout *inputLayout = NULL;
  
      InputLayoutMap::iterator i = mInputLayoutMap.find(ilKey);
      if (i != mInputLayoutMap.end())
      {
          inputLayout = i->second.inputLayout;
          i->second.lastUsedTime = mCounter++;
      }
      else
      {
          ShaderExecutable11 *shader = ShaderExecutable11::makeShaderExecutable11(programBinary->getVertexExecutable());
  
          HRESULT result = mDevice->CreateInputLayout(ilKey.elements, ilKey.elementCount, shader->getFunction(), shader->getLength(), &inputLayout);
          if (FAILED(result))
          {
              ERR("Failed to crate input layout, result: 0x%08x", result);
              return GL_INVALID_OPERATION;
          }
  
          if (mInputLayoutMap.size() >= kMaxInputLayouts)
          {
              TRACE("Overflowed the limit of %u input layouts, removing the least recently used "
                    "to make room.", kMaxInputLayouts);
  
              InputLayoutMap::iterator leastRecentlyUsed = mInputLayoutMap.begin();
              for (InputLayoutMap::iterator i = mInputLayoutMap.begin(); i != mInputLayoutMap.end(); i++)
              {
                  if (i->second.lastUsedTime < leastRecentlyUsed->second.lastUsedTime)
                  {
                      leastRecentlyUsed = i;
                  }
              }
              leastRecentlyUsed->second.inputLayout->Release();
              mInputLayoutMap.erase(leastRecentlyUsed);
          }
  
          InputLayoutCounterPair inputCounterPair;
          inputCounterPair.inputLayout = inputLayout;
          inputCounterPair.lastUsedTime = mCounter++;
  
          mInputLayoutMap.insert(std::make_pair(ilKey, inputCounterPair));
      }
  
      mDeviceContext->IASetInputLayout(inputLayout);
      mDeviceContext->IASetVertexBuffers(0, gl::MAX_VERTEX_ATTRIBS, vertexBuffers, vertexStrides, vertexOffsets);
  
      return GL_NO_ERROR;
  }
  
  std::size_t InputLayoutCache::hashInputLayout(const InputLayoutKey &inputLayout)
  {
      static const unsigned int seed = 0xDEADBEEF;
  
      std::size_t hash = 0;
      MurmurHash3_x86_32(&inputLayout, sizeof(InputLayoutKey), seed, &hash);
      return hash;
  }
  
  bool InputLayoutCache::compareInputLayouts(const InputLayoutKey &a, const InputLayoutKey &b)
  {
      return memcmp(&a, &b, sizeof(InputLayoutKey)) == 0;
  }
  
  }