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	// ep1 - ep0 >= 0: four-interpolated color mode
	// ep1 - ep0 < 0: six-interpolated-color mode
	//
	// we want to avoid ep0 = ep1 in general (because it gives us no useful
	// interpolated values). That means in four-interp mode we want ep1 - ep0 > 0,
	// and in six-interp mode we want ep1 - ep0 < 0. If they're identical or
	// have the wrong sign, we need to fix it!
	int ep_diff = ((ep1_int - ep0_int) ^ target_sign) - target_sign;
	if (ep_diff <= 0)
	{

rygorous

template <int t_nbits>
static inline void quant_endpoint_with_pbit(U8 *deq0, U8 *deq1, int val)
{
	const int expanded_nbits = t_nbits + 1;
	const U32 range = 1u << expanded_nbits;
	const U32 recip255 = 0x8081; // enough bits for our value range
	const int postscale = (0x10000 >> t_nbits) + (0x10000 >> (t_nbits*2 + 1));

	// The reconstruction here adds the pbit as the lowest bit and then reconstructs
	// it as a (nbits+1)-bit value to float, i.e. (quant*2 + pbit) / (range - 1).

rygorous

File Type: DLL

  Section contains the following imports:

    KERNEL32.dll
             180085000 Import Address Table
             18009B1B8 Import Name Table
                     0 time date stamp
                     0 Index of first forwarder reference

rygorous

inName : c:\devel\media\verybig\enwik9
inSize64 : 1000000000
building LRM...
done!
ref_sink: 0x9f93e2e0
SimpleProf         :seconds    calls     count :     clk/call    clk/count
search_one         :  1.2668        1   8388480 : 5320774726.0       634.30
search_one_pf      :  0.9975        1   8388480 : 4189319442.0       499.41
search_multi2      :  1.1072        1   8388480 : 4650070068.0       554.34
search_multi4      :  1.1205        1   8388480 : 4706202060.0       561.03

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  00000000000001BC: D2802009  mov         x9,#0x100
  00000000000001C0: F2C00809  movk        x9,#0x40,lsl #0x20
  00000000000001C4: F90003E9  str         x9,[sp]
  00000000000001C8: D2800209  mov         x9,#0x10
  00000000000001CC: F2C00089  movk        x9,#4,lsl #0x20
  00000000000001D0: F90007E9  str         x9,[sp,#8]
  00000000000001D4: 58000869  ldr         x9,$LN356
  00000000000001D8: F9000BE9  str         x9,[sp,#0x10]
  00000000000001DC: 58000869  ldr         x9,$LN357
  00000000000001E0: F9000FE9  str         x9,[sp,#0x18]

rygorous

---- "Low" effort level (OodleTex_EncodeEffortLevel_Low = 10)

CompressBCN      : 5.258 millis
kodim01.bmp BC7-RGB: rmse=2.4325 hash=0x5dcf9106f8f4415d
CompressBCN      : 5.040 millis
kodim02.bmp BC7-RGB: rmse=2.1168 hash=0x79f45423cd9d3ec0
CompressBCN      : 5.165 millis
kodim03.bmp BC7-RGB: rmse=1.6793 hash=0x806dce71d1ff8293
CompressBCN      : 5.092 millis
kodim04.bmp BC7-RGB: rmse=2.1611 hash=0x681ebb3045e254ec

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    // advance
    for (int i = 0; i < num_streams; ++i)
    {
        std::string desc = formatf("advance %d", i);
        bool is_reverse_stream = (i % 3) == 1;
        if (EARLY_CLZ != 2)
        {
            if (EARLY_CLZ == 0)
                bb->append(CLZ(bits[i], bits[i]).set_comment(desc)); // figure out how many bits we consumed
            if (is_reverse_stream)

rygorous

void bc7_encode_single_color_block(U8 * output_bc7, const U8 rgba[4])
{
	U64 r = rgba[0];
	U64 g = rgba[1];
	U64 b = rgba[2];
	U64 a = rgba[3];

	const U64 bit6_mask = (0x40 << 8) | (0x40 << 22) | (0x40ull << 36);
	const U64 lo7_mask  = (0x7f << 8) | (0x7f << 22) | (0x7full << 36);
	U64 color_bits;

rygorous

reading: c:\devel\media\bc1speedlevel/M_MED_Kurohomura_Backpack_Textures_T_Kurohomura_BP_backpack_D.uasset_build.mip0.png
CompressBC7      : 65.720 millis, 3.51 kc/B, rate= 997.20 kB/s
per-pixel rmse : 0.6425
mode stats (8=invalid 9=solid):
[0]     567 (  0.87%)
[1]    5465 (  8.34%)
[2]     126 (  0.19%)
[3]   15855 ( 24.19%)
[4]     909 (  1.39%)
[5]   15072 ( 23.00%)

rygorous

Cixin Liu, "The Three-Body Problem", Chapter 4 "The Frontriers of Science"

Page numbers given from trade paperback, ISBN 978 0-7653-8203-0

Pg. 53: 

  Shi and the young cop said nothing. Both turned and went down the stairs. The two
  army officers watched them leave and seemed to sigh with relief.
  
  "What's wrong with that guy?" the major whispered to the other officer.