/// <summary>
///
/// </summary>
/// <param name="texture"></param>
/// <param name="channel"></param>
private DensityMap(Texture texture, MapChannel channel)
{
Debug.Assert(texture != null);
mFilter = MapFilter.Bilinear;
//Add self to selfList
mSelfKey = texture.Name + (int)channel;
mSelfList.Add(mSelfKey, this);
mRefCount = 0;
//Get the texture buffer
HardwarePixelBuffer buff = texture.GetBuffer();
//Prepare a PixelBox (8-bit greyscale) to receive the density values
mPixels = new PixelBox(new BasicBox(0, 0, buff.Width, buff.Height), PixelFormat.BYTE_L);
byte[] pixelData = new byte[mPixels.ConsecutiveSize];
mPixelPtr = Memory.PinObject(pixelData);
mPixels.Data = mPixelPtr;
if (channel == MapChannel.Color)
{
//Copy to the greyscale density map directly if no channel extraction is necessary
buff.BlitToMemory(mPixels);
}
else
{
unsafe
{
//If channel extraction is necessary, first convert to a PF_R8G8B8A8 format PixelBox
//This is necessary for the code below to properly extract the desired channel
PixelBox tmpPixels = new PixelBox(new BasicBox(0, 0, buff.Width, buff.Height), PixelFormat.R8G8B8A8);
byte[] tmpPix = new byte[tmpPixels.ConsecutiveSize];
byte * pixPtr = (byte *)Memory.PinObject(tmpPix);
tmpPixels.Data = (IntPtr)pixPtr;
buff.BlitToMemory(tmpPixels);
//Pick out a channel from the pixel buffer
int channelOffset = 0;
switch (channel)
{
case MapChannel.Red:
channelOffset = 3;
break;
case MapChannel.Green:
channelOffset = 2;
break;
case MapChannel.Blue:
channelOffset = 1;
break;
case MapChannel.Alpha:
channelOffset = 0;
break;
default:
//should never happen
throw new Exception("Invalid channel");
}
//And copy that channel into the density map
byte *inputPtr = (byte *)pixPtr + channelOffset;
byte *outputPtr = (byte *)pixPtr + channelOffset;
byte *outputEndPtr = outputPtr + mPixels.ConsecutiveSize;
while (outputPtr != outputEndPtr)
{
*outputPtr++ = *inputPtr++;
inputPtr += 4;
}
//Finally, delete the temporary PF_R8G8B8A8 pixel buffer
Memory.UnpinObject(tmpPix);
tmpPixels = null;
}
}
}
/// <summary>
///
/// </summary>
/// <param name="texture"></param>
/// <param name="channel"></param>
private ColorMap(Texture texture, MapChannel channel)
{
Debug.Assert(texture != null);
mFilter = MapFilter.Bilinear;
//Add self to selfList
mSelfKey = texture.Name + (int)channel;
mSelfList.Add(mSelfKey, this);
mRefCount = 0;
//Get the texture buffer
HardwarePixelBuffer buff = texture.GetBuffer();
#warning Root::getSingleton().getRenderSystem()->getColourVertexElementType();
//Prepare a PixelBox (24-bit RGB) to receive the color values
VertexElementType format = VertexElementType.Color_ARGB;
switch (format)
{
case VertexElementType.Color_ARGB:
//DirectX9
mPixels = new PixelBox(new BasicBox(0, 0, buff.Width, buff.Height), PixelFormat.A8B8G8R8);
break;
case VertexElementType.Color_ABGR:
//OpenGL
mPixels = new PixelBox(new BasicBox(0, 0, buff.Width, buff.Height), PixelFormat.A8B8G8R8);
//Patch for Ogre's incorrect blitToMemory() when copying from PF_L8 in OpenGL
if (buff.Format == PixelFormat.L8)
{
channel = MapChannel.Red;
}
break;
default:
throw new Exception("Unknown RenderSystem color format");
}
byte[] pixelData = new byte[mPixels.ConsecutiveSize];
mPixelPtr = Memory.PinObject(pixelData);
mPixels.Data = mPixelPtr;
if (channel == MapChannel.Color)
{
//Copy to the color map directly if no channel extraction is necessary
buff.BlitToMemory(mPixels);
}
else
{
unsafe
{
//If channel extraction is necessary, first convert to a PF_R8G8B8A8 format PixelBox
//This is necessary for the code below to properly extract the desired channel
PixelBox tmpPixels = new PixelBox(new BasicBox(0, 0, buff.Width, buff.Height), PixelFormat.R8G8B8A8);
byte[] tmpPix = new byte[tmpPixels.ConsecutiveSize];
byte * pixPtr = (byte *)Memory.PinObject(tmpPix);
tmpPixels.Data = (IntPtr)pixPtr;
buff.BlitToMemory(tmpPixels);
//Pick out a channel from the pixel buffer
int channelOffset = 0;
switch (channel)
{
case MapChannel.Red:
channelOffset = 3;
break;
case MapChannel.Green:
channelOffset = 2;
break;
case MapChannel.Blue:
channelOffset = 1;
break;
case MapChannel.Alpha:
channelOffset = 0;
break;
default:
//should never happen
throw new Exception("Invalid channel");
}
//And copy that channel into the density map
byte *inputPtr = (byte *)pixPtr + channelOffset;
byte *outputPtr = (byte *)pixPtr + channelOffset;
byte *outputEndPtr = outputPtr + mPixels.ConsecutiveSize;
while (outputPtr != outputEndPtr)
{
*outputPtr++ = *inputPtr;
*outputPtr++ = *inputPtr;
*outputPtr++ = *inputPtr;
*outputPtr++ = 0xFF; //Full alpha
inputPtr += 4;
}
//Finally, delete the temporary PF_R8G8B8A8 pixel buffer
Memory.UnpinObject(tmpPix);
tmpPixels = null;
tmpPix = null;
}
}
}