Optimization: remove extra copy of data buffer in Ogre2GpuRays and Og…

…re2DepthCamera (#1022)

Signed-off-by: Ian Chen <[email protected]>

ogre2/src/Ogre2DepthCamera.cc

@@ -92,15 +92,13 @@ class Ogre2DepthGaussianNoisePass : public Ogre2GaussianNoisePass
 /// \brief Private data for the Ogre2DepthCamera class
 class gz::rendering::Ogre2DepthCameraPrivate
 {
-  /// \brief The depth buffer
+  /// \brief The depth buffer - also the outgoing point cloud data used
+  /// by newRgbPointCloud event
   public: float *depthBuffer = nullptr;
 
   /// \brief Outgoing depth data, used by newDepthFrame event.
   public: float *depthImage = nullptr;
 
-  /// \brief Outgoing point cloud data, used by newRgbPointCloud event.
-  public: float *pointCloudImage = nullptr;
-
   /// \brief maximum value used for data outside sensor range
   public: float dataMaxVal = gz::math::INF_D;
 
@@ -316,12 +314,6 @@ void Ogre2DepthCamera::Destroy()
     this->dataPtr->depthImage = nullptr;
   }
 
-  if (this->dataPtr->pointCloudImage)
-  {
-    delete [] this->dataPtr->pointCloudImage;
-    this->dataPtr->pointCloudImage = nullptr;
-  }
-
   if (!this->ogreCamera)
     return;
 
@@ -1195,10 +1187,6 @@ void Ogre2DepthCamera::PostRender()
   {
     this->dataPtr->depthImage = new float[len];
   }
-  if (!this->dataPtr->pointCloudImage)
-  {
-    this->dataPtr->pointCloudImage = new float[len * channelCount];
-  }
 
   // fill depth data
   for (unsigned int i = 0; i < height; ++i)
@@ -1216,10 +1204,8 @@ void Ogre2DepthCamera::PostRender()
   // point cloud data
   if (this->dataPtr->newRgbPointCloud.ConnectionCount() > 0u)
   {
-    memcpy(this->dataPtr->pointCloudImage,
-      this->dataPtr->depthBuffer, len * channelCount * sizeof(float));
     this->dataPtr->newRgbPointCloud(
-        this->dataPtr->pointCloudImage, width, height, channelCount,
+        this->dataPtr->depthBuffer, width, height, channelCount,
         "PF_FLOAT32_RGBA");
 
     // Uncomment to debug color output
@@ -1229,7 +1215,7 @@ void Ogre2DepthCamera::PostRender()
     //   for (unsigned int j = 0; j < width; ++j)
     //   {
     //     float color =
-    //         this->dataPtr->pointCloudImage[step + j*channelCount + 3];
+    //         this->dataPtr->depthBuffer[step + j*channelCount + 3];
     //     // unpack rgb data
     //     uint32_t *rgba = reinterpret_cast<uint32_t *>(&color);
     //     unsigned int r = *rgba >> 24 & 0xFF;
@@ -1246,9 +1232,9 @@ void Ogre2DepthCamera::PostRender()
     // {
     //   for (unsigned int j = 0; j < width; ++j)
     //   {
-    //     gzdbg << "[" << this->dataPtr->pointCloudImage[i*width*4+j*4] << "]"
-    //       << "[" << this->dataPtr->pointCloudImage[i*width*4+j*4+1] << "]"
-    //       << "[" << this->dataPtr->pointCloudImage[i*width*4+j*4+2] << "],";
+    //     gzdbg << "[" << this->dataPtr->depthBuffer[i*width*4+j*4] << "]"
+    //       << "[" << this->dataPtr->depthBuffer[i*width*4+j*4+1] << "]"
+    //       << "[" << this->dataPtr->depthBuffer[i*width*4+j*4+2] << "],";
     //   }
     //   gzdbg << std::endl;
     // }

ogre2/src/Ogre2GpuRays.cc

@@ -127,9 +127,6 @@ class GZ_RENDERING_OGRE2_HIDDEN gz::rendering::Ogre2GpuRaysPrivate
                unsigned int, unsigned int, unsigned int,
                const std::string &)> newGpuRaysFrame;
 
-  /// \brief Raw buffer of gpu rays data.
-  public: float *gpuRaysBuffer = nullptr;
-
   /// \brief Outgoing gpu rays data, used by newGpuRaysFrame event.
   public: float *gpuRaysScan = nullptr;
 
@@ -597,12 +594,6 @@ void Ogre2GpuRays::Destroy()
   if (!this->dataPtr->ogreCamera)
     return;
 
-  if (this->dataPtr->gpuRaysBuffer)
-  {
-    delete [] this->dataPtr->gpuRaysBuffer;
-    this->dataPtr->gpuRaysBuffer = nullptr;
-  }
-
   if (this->dataPtr->gpuRaysScan)
   {
     delete [] this->dataPtr->gpuRaysScan;
@@ -1326,32 +1317,13 @@ void Ogre2GpuRays::PostRender()
   PixelFormat format = PF_FLOAT32_RGBA;
   unsigned int rawChannelCount = PixelUtil::ChannelCount(format);
   unsigned int bytesPerChannel = PixelUtil::BytesPerChannel(format);
-  int rawLen = width * height * rawChannelCount;
-
-  if (!this->dataPtr->gpuRaysBuffer)
-  {
-    this->dataPtr->gpuRaysBuffer = new float[rawLen];
-  }
 
   // blit data from gpu to cpu
   Ogre::Image2 image;
   image.convertFromTexture(this->dataPtr->secondPassTexture, 0u, 0u);
   Ogre::TextureBox box = image.getData(0u);
   float *bufferTmp = static_cast<float *>(box.data);
 
-  // TODO(anyone): It seems wasteful to have gpuRaysBuffer at all
-  // We should be able to convert directly from bufferTmp to gpuRaysScan
-
-  // copy data row by row. The texture box may not be a contiguous region of
-  // a texture
-  for (unsigned int i = 0; i < height; ++i)
-  {
-    unsigned int rawDataRowIdx = i * box.bytesPerRow / bytesPerChannel;
-    unsigned int rowIdx = i * width * rawChannelCount;
-    memcpy(&this->dataPtr->gpuRaysBuffer[rowIdx], &bufferTmp[rawDataRowIdx],
-        width * rawChannelCount * bytesPerChannel);
-  }
-
   // Metal does not support RGB32_FLOAT so the internal texture format is
   // RGBA32_FLOAT. For backward compatibility, output data is kept in RGB
   // format instead of RGBA
@@ -1364,21 +1336,19 @@ void Ogre2GpuRays::PostRender()
   // copy data from RGBA buffer to RGB buffer
   for (unsigned int row = 0; row < height; ++row)
   {
+    unsigned int rawDataRowIdx = row * box.bytesPerRow / bytesPerChannel;
+    unsigned int rowIdx = row * width * this->Channels();
+
     // the texture box step size could be larger than our image buffer step
     // size
     for (unsigned int column = 0; column < width; ++column)
     {
-      unsigned int idx = (row * width * this->Channels()) +
-          column * this->Channels();
-      unsigned int rawIdx = (row * width * rawChannelCount) +
-          column * rawChannelCount;
-
-      this->dataPtr->gpuRaysScan[idx] =
-          this->dataPtr->gpuRaysBuffer[rawIdx];
-      this->dataPtr->gpuRaysScan[idx + 1] =
-          this->dataPtr->gpuRaysBuffer[rawIdx + 1];
-      this->dataPtr->gpuRaysScan[idx + 2] =
-          this->dataPtr->gpuRaysBuffer[rawIdx + 2];
+      unsigned int idx = rowIdx + column * this->Channels();
+      unsigned int rawIdx = rawDataRowIdx + column * rawChannelCount;
+
+      this->dataPtr->gpuRaysScan[idx] = bufferTmp[rawIdx];
+      this->dataPtr->gpuRaysScan[idx + 1] = bufferTmp[rawIdx + 1];
+      this->dataPtr->gpuRaysScan[idx + 2] = bufferTmp[rawIdx + 2];
     }
   }