private static void CompressPvrtc(TextureContent content, bool generateMipmaps, bool premultipliedAlpha)
{
// TODO: Once uncompressed mipmap generation is supported, first use NVTT to generate mipmaps,
// then compress them withthe PVRTC tool, so we have the same implementation of mipmap generation
// across platforms.
// Calculate number of mip levels
var width = content.Faces[0][0].Height;
var height = content.Faces[0][0].Width;
var numberOfMipLevels = 1;
if (generateMipmaps)
{
while (height != 1 || width != 1)
{
height = Math.Max(height / 2, 1);
width = Math.Max(width / 2, 1);
numberOfMipLevels++;
}
}
IntPtr dataSizesPtr = IntPtr.Zero;
var texDataPtr = ManagedPVRTC.ManagedPVRTC.CompressTexture(content.Faces[0][0].GetPixelData(),
content.Faces[0][0].Height,
content.Faces[0][0].Width,
numberOfMipLevels,
premultipliedAlpha,
true,
ref dataSizesPtr);
// Store the size of each mip level
var dataSizesArray = new int[numberOfMipLevels];
Marshal.Copy(dataSizesPtr, dataSizesArray, 0, dataSizesArray.Length);
var levelSize = 0;
byte[] levelData;
var sourceWidth = content.Faces[0][0].Width;
var sourceHeight = content.Faces[0][0].Height;
content.Faces[0].Clear();
for (int x = 0; x < numberOfMipLevels; x++)
{
levelSize = dataSizesArray[x];
levelData = new byte[levelSize];
Marshal.Copy(texDataPtr, levelData, 0, levelSize);
var levelWidth = Math.Max(sourceWidth >> x, 1);
var levelHeight = Math.Max(sourceHeight >> x, 1);
var bmpContent = new PvrtcBitmapContent(4, sourceWidth, sourceHeight);
bmpContent.SetPixelData(levelData);
content.Faces[0].Add(bmpContent);
texDataPtr = IntPtr.Add(texDataPtr, levelSize);
}
}
private static void CompressPvrtc(TextureContent content, bool generateMipmaps, bool premultipliedAlpha)
{
// TODO: Once uncompressed mipmap generation is supported, first use NVTT to generate mipmaps,
// then compress them withthe PVRTC tool, so we have the same implementation of mipmap generation
// across platforms.
// Calculate number of mip levels
var width = content.Faces[0][0].Height;
var height = content.Faces[0][0].Width;
if (!IsPowerOfTwo(width) || !IsPowerOfTwo(height))
throw new PipelineException("PVRTC Compressed textures width and height must be powers of two.");
if (width != height)
throw new PipelineException("PVRTC Compressed textures must be square. i.e width == height.");
var numberOfMipLevels = 1;
if (generateMipmaps)
{
while (height != 1 || width != 1)
{
height = Math.Max(height / 2, 1);
width = Math.Max(width / 2, 1);
numberOfMipLevels++;
}
}
IntPtr dataSizesPtr = IntPtr.Zero;
var texDataPtr = ManagedPVRTC.ManagedPVRTC.CompressTexture(content.Faces[0][0].GetPixelData(),
content.Faces[0][0].Height,
content.Faces[0][0].Width,
numberOfMipLevels,
premultipliedAlpha,
true,
ref dataSizesPtr);
// Store the size of each mip level
var dataSizesArray = new int[numberOfMipLevels];
Marshal.Copy(dataSizesPtr, dataSizesArray, 0, dataSizesArray.Length);
var levelSize = 0;
byte[] levelData;
var sourceWidth = content.Faces[0][0].Width;
var sourceHeight = content.Faces[0][0].Height;
content.Faces[0].Clear();
for (int x = 0; x < numberOfMipLevels; x++)
{
levelSize = dataSizesArray[x];
levelData = new byte[levelSize];
Marshal.Copy(texDataPtr, levelData, 0, levelSize);
var levelWidth = Math.Max(sourceWidth >> x, 1);
var levelHeight = Math.Max(sourceHeight >> x, 1);
var bmpContent = new PvrtcBitmapContent(4, sourceWidth, sourceHeight);
bmpContent.SetPixelData(levelData);
content.Faces[0].Add(bmpContent);
texDataPtr = IntPtr.Add(texDataPtr, levelSize);
}
}
