private static void optimizeEndPoints4(Vector3 *points, CMPRBlock *block)
{
float alpha2_sum = 0.0f;
float beta2_sum = 0.0f;
float alphabeta_sum = 0.0f;
Vector3 alphax_sum = new Vector3();
Vector3 betax_sum = new Vector3();
uint indices = block->_lookup;
for (int i = 0, bi = 30; i < 16; ++i, bi -= 2)
{
uint bits = indices >> bi;
float beta = bits & 1;
if ((bits & 2) != 0)
{
beta = (1 + beta) / 3.0f;
}
float alpha = 1.0f - beta;
alpha2_sum += alpha * alpha;
beta2_sum += beta * beta;
alphabeta_sum += alpha * beta;
alphax_sum += alpha * points[i];
betax_sum += beta * points[i];
}
float denom = alpha2_sum * beta2_sum - alphabeta_sum * alphabeta_sum;
if (Math.Abs(denom) <= 0.0001f)
{
return;
}
float factor = 1.0f / denom;
Vector3 a = (alphax_sum * beta2_sum - betax_sum * alphabeta_sum) * factor;
Vector3 b = (betax_sum * alpha2_sum - alphax_sum * alphabeta_sum) * factor;
a.Clamp(0.0f, 255.0f);
b.Clamp(0.0f, 255.0f);
ushort color0 = roundAndExpand(&a);
ushort color1 = roundAndExpand(&b);
if (color0 < color1)
{
Vector3 t = a;
a = b;
b = t;
VoidPtr.Swap(&color0, &color1);
}
//CMPRBlock block = new CMPRBlock();
block->_root0._data = color0;
block->_root1._data = color1;
block->_lookup = computeIndices4(points, &a, &b);
}
protected override void EncodeBlock(ARGBPixel *sPtr, VoidPtr blockAddr, int width)
{
CMPRBlock *dPtr = (CMPRBlock *)blockAddr;
for (int y = 0; y < 2; y++, sPtr += (width * 4))
{
for (int x = 0; x < 8; x += 4)
{
*dPtr++ = CMPRBlock.Encode(&sPtr[x], width, false);
}
}
}
public UnsafeBuffer GeneratePreview(Bitmap bmp)
{
//_blockCache.Clear();
int w = bmp.Width, h = bmp.Height;
int aw = w.Align(BlockWidth), ah = h.Align(BlockHeight);
UnsafeBuffer buffer = new UnsafeBuffer((aw / 4) * (ah / 4) * 8);
CMPRBlock * bPtr = (CMPRBlock *)buffer.Address;
//using (Bitmap bmp = src.Clone(new Rectangle(0, 0, aw, ah), PixelFormat.Format32bppArgb))
//{
// BitmapData data = bmp.LockBits(new Rectangle(0,0,aw,ah), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
// for (int y1 = 0; y1 < ah; y1 += 8)
// for (int x1 = 0; x1 < aw; x1 += 8)
// for (int y = 0; y < 8; y += 4)
// for (int x = 0; x < 8; x += 4)
// {
// ARGBPixel* ptr = (ARGBPixel*)dib.Scan0 + (((y1 + y) * aw) + (x1 + x));
// CMPBlock block = CMPBlock.Encode(ptr, aw, false);
// _blockCache.Add(block);
// block.Decode(ptr, aw);
// }
//}
using (DIB dib = DIB.FromBitmap(bmp, BlockWidth, BlockHeight, PixelFormat.Format32bppArgb))
{
ARGBPixel *img = (ARGBPixel *)dib.Scan0;
for (int y1 = 0; y1 < ah; y1 += 8)
{
for (int x1 = 0; x1 < aw; x1 += 8)
{
for (int y = 0; y < 8; y += 4)
{
for (int x = 0; x < 8; x += 4)
{
*bPtr = NVDXT.compressDXT1a(img, x1 + x, y1 + y, aw, ah);
bPtr->Decode(img, x1 + x, y1 + y, aw, ah);
bPtr++;
}
}
}
}
dib.WriteBitmap(bmp, w, h);
}
return(buffer);
}
//private List<CMPBlock> _blockCache = new List<CMPBlock>();
//private int _blockIndex;
protected override void DecodeBlock(VoidPtr blockAddr, ARGBPixel *dPtr, int width)
{
CMPRBlock *sPtr = (CMPRBlock *)blockAddr;
//ARGBPixel* dPtr = (ARGBPixel*)destAddr;
//int index = 0;
for (int y = 0; y < 8; y += 4)
{
for (int x = 0; x < 8; x += 4, sPtr++)
{
sPtr->Decode(&dPtr[(y * width) + x], width);
}
}
//DXT1.DecodeBlock(&sPtr[index++], &dPtr[(y * width) + x], width);
}
//internal override void EncodeLevel(TEX0v1* header, DIB dib, Bitmap src, int dStep, int sStep, int level)
//{
// if ((level == 1) && (_blockBuffer != null))
// {
// CMPRBlock* sPtr = (CMPRBlock*)_blockBuffer.Address;
// CMPRBlock* dPtr = (CMPRBlock*)header->PixelData;
// int blocks = _blockBuffer.Length / 8;
// for (int i = 0; i < blocks; i++)
// dPtr[i] = sPtr[i];
// }
// else
// base.EncodeLevel(header, dib, src, dStep, sStep, level);
//}
internal override void EncodeLevel(VoidPtr addr, DIB dib, Bitmap src, int dStep, int sStep, int level)
{
if ((level == 1) && (_blockBuffer != null))
{
CMPRBlock *sPtr = (CMPRBlock *)_blockBuffer.Address;
CMPRBlock *dPtr = (CMPRBlock *)addr;
int blocks = _blockBuffer.Length / 8;
for (int i = 0; i < blocks; i++)
{
dPtr[i] = sPtr[i];
}
}
else
{
base.EncodeLevel(addr, dib, src, dStep, sStep, level);
}
}