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// basisu_pvrtc1_4.cpp
// Copyright (C) 2019-2021 Binomial LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "basisu_pvrtc1_4.h"
namespace basisu
{
#if 0
static const uint8_t g_pvrtc_5[32] = { 0,8,16,24,33,41,49,57,66,74,82,90,99,107,115,123,132,140,148,156,165,173,181,189,198,206,214,222,231,239,247,255 };
static const uint8_t g_pvrtc_4[16] = { 0,16,33,49,66,82,99,115,140,156,173,189,206,222,239,255 };
static const uint8_t g_pvrtc_3[8] = { 0,33,74,107,148,181,222,255 };
static const uint8_t g_pvrtc_alpha[9] = { 0,34,68,102,136,170,204,238,255 };
#endif
static const uint8_t g_pvrtc_5_nearest[256] = { 0,0,0,0,0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,15,16,16,16,16,16,16,16,16,16,17,17,17,17,17,17,17,17,18,18,18,18,18,18,18,18,19,19,19,19,19,19,19,19,20,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,22,22,22,22,22,22,22,22,23,23,23,23,23,23,23,23,24,24,24,24,24,24,24,24,24,25,25,25,25,25,25,25,25,26,26,26,26,26,26,26,26,27,27,27,27,27,27,27,27,28,28,28,28,28,28,28,28,28,29,29,29,29,29,29,29,29,30,30,30,30,30,30,30,30,31,31,31,31 };
static const uint8_t g_pvrtc_4_nearest[256] = { 0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,15 };
#if 0
static const uint8_t g_pvrtc_3_nearest[256] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 };
static const uint8_t g_pvrtc_alpha_nearest[256] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8 };
#endif
#if 0
static const uint8_t g_pvrtc_5_floor[256] =
{
0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,
3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,
7,7,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,11,11,11,11,11,11,
11,11,11,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,15,15,15,15,15,
15,15,15,15,16,16,16,16,16,16,16,16,17,17,17,17,17,17,17,17,18,18,18,18,18,18,18,18,19,19,19,19,
19,19,19,19,19,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,22,22,22,22,22,22,22,22,23,23,23,
23,23,23,23,23,23,24,24,24,24,24,24,24,24,25,25,25,25,25,25,25,25,26,26,26,26,26,26,26,26,27,27,
27,27,27,27,27,27,27,28,28,28,28,28,28,28,28,29,29,29,29,29,29,29,29,30,30,30,30,30,30,30,30,31
};
static const uint8_t g_pvrtc_5_ceil[256] =
{
0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,
4,4,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,8,8,8,8,8,8,
8,8,8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,12,12,12,12,12,
12,12,12,12,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,15,16,16,16,16,
16,16,16,16,16,17,17,17,17,17,17,17,17,18,18,18,18,18,18,18,18,19,19,19,19,19,19,19,19,20,20,20,
20,20,20,20,20,20,21,21,21,21,21,21,21,21,22,22,22,22,22,22,22,22,23,23,23,23,23,23,23,23,24,24,
24,24,24,24,24,24,24,25,25,25,25,25,25,25,25,26,26,26,26,26,26,26,26,27,27,27,27,27,27,27,27,28,
28,28,28,28,28,28,28,28,29,29,29,29,29,29,29,29,30,30,30,30,30,30,30,30,31,31,31,31,31,31,31,31
};
static const uint8_t g_pvrtc_4_floor[256] =
{
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,9,9,9,9,
9,9,9,9,9,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,
11,11,11,11,11,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13,13,
13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,15
};
static const uint8_t g_pvrtc_4_ceil[256] =
{
0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,10,10,10,
10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,12,12,
12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,14,
14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15
};
static const uint8_t g_pvrtc_3_floor[256] =
{
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,
4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,
5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7
};
static const uint8_t g_pvrtc_3_ceil[256] =
{
0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,
5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
};
static const uint8_t g_pvrtc_alpha_floor[256] =
{
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8
};
static const uint8_t g_pvrtc_alpha_ceil[256] =
{
0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
};
#endif
uint32_t pvrtc4_swizzle_uv(uint32_t width, uint32_t height, uint32_t x, uint32_t y)
{
assert((x < width) && (y < height) && basisu::is_pow2(height) && basisu::is_pow2(width));
uint32_t min_d = width, max_v = y;
if (height < width)
{
min_d = height;
max_v = x;
}
// Interleave the XY LSB's
uint32_t shift_ofs = 0, swizzled = 0;
for (uint32_t s_bit = 1, d_bit = 1; s_bit < min_d; s_bit <<= 1, d_bit <<= 2, ++shift_ofs)
{
if (y & s_bit) swizzled |= d_bit;
if (x & s_bit) swizzled |= (2 * d_bit);
}
max_v >>= shift_ofs;
// OR in the rest of the bits from the largest dimension
swizzled |= (max_v << (2 * shift_ofs));
return swizzled;
}
color_rgba pvrtc4_block::get_endpoint(uint32_t endpoint_index, bool unpack) const
{
assert(endpoint_index < 2);
const uint32_t packed = m_endpoints >> (endpoint_index * 16);
uint32_t r, g, b, a;
if (packed & 0x8000)
{
// opaque 554 or 555
if (!endpoint_index)
{
r = (packed >> 10) & 31;
g = (packed >> 5) & 31;
b = (packed >> 1) & 15;
if (unpack)
{
b = (b << 1) | (b >> 3);
}
}
else
{
r = (packed >> 10) & 31;
g = (packed >> 5) & 31;
b = packed & 31;
}
a = unpack ? 255 : 7;
}
else
{
// translucent 4433 or 4443
if (!endpoint_index)
{
a = (packed >> 12) & 7;
r = (packed >> 8) & 15;
g = (packed >> 4) & 15;
b = (packed >> 1) & 7;
if (unpack)
{
a = (a << 1);
a = (a << 4) | a;
r = (r << 1) | (r >> 3);
g = (g << 1) | (g >> 3);
b = (b << 2) | (b >> 1);
}
}
else
{
a = (packed >> 12) & 7;
r = (packed >> 8) & 15;
g = (packed >> 4) & 15;
b = packed & 15;
if (unpack)
{
a = (a << 1);
a = (a << 4) | a;
r = (r << 1) | (r >> 3);
g = (g << 1) | (g >> 3);
b = (b << 1) | (b >> 3);
}
}
}
if (unpack)
{
r = (r << 3) | (r >> 2);
g = (g << 3) | (g >> 2);
b = (b << 3) | (b >> 2);
}
assert((r < 256) && (g < 256) && (b < 256) && (a < 256));
return color_rgba(r, g, b, a);
}
color_rgba pvrtc4_block::get_endpoint_5554(uint32_t endpoint_index) const
{
assert(endpoint_index < 2);
const uint32_t packed = m_endpoints >> (endpoint_index * 16);
uint32_t r, g, b, a;
if (packed & 0x8000)
{
// opaque 554 or 555
if (!endpoint_index)
{
r = (packed >> 10) & 31;
g = (packed >> 5) & 31;
b = (packed >> 1) & 15;
b = (b << 1) | (b >> 3);
}
else
{
r = (packed >> 10) & 31;
g = (packed >> 5) & 31;
b = packed & 31;
}
a = 15;
}
else
{
// translucent 4433 or 4443
if (!endpoint_index)
{
a = (packed >> 12) & 7;
r = (packed >> 8) & 15;
g = (packed >> 4) & 15;
b = (packed >> 1) & 7;
a = a << 1;
r = (r << 1) | (r >> 3);
g = (g << 1) | (g >> 3);
b = (b << 2) | (b >> 1);
}
else
{
a = (packed >> 12) & 7;
r = (packed >> 8) & 15;
g = (packed >> 4) & 15;
b = packed & 15;
a = a << 1;
r = (r << 1) | (r >> 3);
g = (g << 1) | (g >> 3);
b = (b << 1) | (b >> 3);
}
}
assert((r < 32) && (g < 32) && (b < 32) && (a < 16));
return color_rgba(r, g, b, a);
}
bool pvrtc4_image::get_interpolated_colors(uint32_t x, uint32_t y, color_rgba* pColors) const
{
assert((x < m_width) && (y < m_height));
int block_x0 = (static_cast<int>(x) - 2) >> 2;
int block_x1 = block_x0 + 1;
int block_y0 = (static_cast<int>(y) - 2) >> 2;
int block_y1 = block_y0 + 1;
block_x0 = posmod(block_x0, m_block_width);
block_x1 = posmod(block_x1, m_block_width);
block_y0 = posmod(block_y0, m_block_height);
block_y1 = posmod(block_y1, m_block_height);
pColors[0] = interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(0), m_blocks(block_x1, block_y0).get_endpoint_5554(0), m_blocks(block_x0, block_y1).get_endpoint_5554(0), m_blocks(block_x1, block_y1).get_endpoint_5554(0));
pColors[3] = interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(1), m_blocks(block_x1, block_y0).get_endpoint_5554(1), m_blocks(block_x0, block_y1).get_endpoint_5554(1), m_blocks(block_x1, block_y1).get_endpoint_5554(1));
if (get_block_uses_transparent_modulation(x >> 2, y >> 2))
{
for (uint32_t c = 0; c < 4; c++)
{
uint32_t m = (pColors[0][c] + pColors[3][c]) / 2;
pColors[1][c] = static_cast<uint8_t>(m);
pColors[2][c] = static_cast<uint8_t>(m);
}
pColors[2][3] = 0;
return true;
}
for (uint32_t c = 0; c < 4; c++)
{
pColors[1][c] = static_cast<uint8_t>((pColors[0][c] * 5 + pColors[3][c] * 3) / 8);
pColors[2][c] = static_cast<uint8_t>((pColors[0][c] * 3 + pColors[3][c] * 5) / 8);
}
return false;
}
color_rgba pvrtc4_image::get_pixel(uint32_t x, uint32_t y, uint32_t m) const
{
assert((x < m_width) && (y < m_height));
int block_x0 = (static_cast<int>(x) - 2) >> 2;
int block_x1 = block_x0 + 1;
int block_y0 = (static_cast<int>(y) - 2) >> 2;
int block_y1 = block_y0 + 1;
block_x0 = posmod(block_x0, m_block_width);
block_x1 = posmod(block_x1, m_block_width);
block_y0 = posmod(block_y0, m_block_height);
block_y1 = posmod(block_y1, m_block_height);
if (get_block_uses_transparent_modulation(x >> 2, y >> 2))
{
if (m == 0)
return interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(0), m_blocks(block_x1, block_y0).get_endpoint_5554(0), m_blocks(block_x0, block_y1).get_endpoint_5554(0), m_blocks(block_x1, block_y1).get_endpoint_5554(0));
else if (m == 3)
return interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(1), m_blocks(block_x1, block_y0).get_endpoint_5554(1), m_blocks(block_x0, block_y1).get_endpoint_5554(1), m_blocks(block_x1, block_y1).get_endpoint_5554(1));
color_rgba l(interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(0), m_blocks(block_x1, block_y0).get_endpoint_5554(0), m_blocks(block_x0, block_y1).get_endpoint_5554(0), m_blocks(block_x1, block_y1).get_endpoint_5554(0)));
color_rgba h(interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(1), m_blocks(block_x1, block_y0).get_endpoint_5554(1), m_blocks(block_x0, block_y1).get_endpoint_5554(1), m_blocks(block_x1, block_y1).get_endpoint_5554(1)));
return color_rgba((l[0] + h[0]) / 2, (l[1] + h[1]) / 2, (l[2] + h[2]) / 2, (m == 2) ? 0 : (l[3] + h[3]) / 2);
}
else
{
if (m == 0)
return interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(0), m_blocks(block_x1, block_y0).get_endpoint_5554(0), m_blocks(block_x0, block_y1).get_endpoint_5554(0), m_blocks(block_x1, block_y1).get_endpoint_5554(0));
else if (m == 3)
return interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(1), m_blocks(block_x1, block_y0).get_endpoint_5554(1), m_blocks(block_x0, block_y1).get_endpoint_5554(1), m_blocks(block_x1, block_y1).get_endpoint_5554(1));
color_rgba l(interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(0), m_blocks(block_x1, block_y0).get_endpoint_5554(0), m_blocks(block_x0, block_y1).get_endpoint_5554(0), m_blocks(block_x1, block_y1).get_endpoint_5554(0)));
color_rgba h(interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(1), m_blocks(block_x1, block_y0).get_endpoint_5554(1), m_blocks(block_x0, block_y1).get_endpoint_5554(1), m_blocks(block_x1, block_y1).get_endpoint_5554(1)));
if (m == 2)
return color_rgba((l[0] * 3 + h[0] * 5) / 8, (l[1] * 3 + h[1] * 5) / 8, (l[2] * 3 + h[2] * 5) / 8, (l[3] * 3 + h[3] * 5) / 8);
else
return color_rgba((l[0] * 5 + h[0] * 3) / 8, (l[1] * 5 + h[1] * 3) / 8, (l[2] * 5 + h[2] * 3) / 8, (l[3] * 5 + h[3] * 3) / 8);
}
}
uint64_t pvrtc4_image::local_endpoint_optimization_opaque(uint32_t bx, uint32_t by, const image& orig_img, bool perceptual)
{
uint64_t initial_error = evaluate_1x1_endpoint_error(bx, by, orig_img, perceptual, false);
if (!initial_error)
return initial_error;
vec3F c_avg_orig(0);
for (int y = 0; y < 7; y++)
{
const uint32_t py = wrap_y(by * 4 + y - 1);
for (uint32_t x = 0; x < 7; x++)
{
const uint32_t px = wrap_x(bx * 4 + x - 1);
const color_rgba& c = orig_img(px, py);
c_avg_orig[0] += c[0];
c_avg_orig[1] += c[1];
c_avg_orig[2] += c[2];
}
}
c_avg_orig *= 1.0f / 49.0f;
vec3F quant_colors[2];
quant_colors[0].set(c_avg_orig);
quant_colors[0] -= vec3F(.0125f);
quant_colors[1].set(c_avg_orig);
quant_colors[1] += vec3F(.0125f);
float total_weight[2];
bool success = true;
for (uint32_t pass = 0; pass < 4; pass++)
{
vec3F new_colors[2] = { vec3F(0), vec3F(0) };
memset(total_weight, 0, sizeof(total_weight));
static const float s_weights[7][7] =
{
{ 1.000000f, 1.637089f, 2.080362f, 2.242640f, 2.080362f, 1.637089f, 1.000000f },
{ 1.637089f, 2.414213f, 3.006572f, 3.242640f, 3.006572f, 2.414213f, 1.637089f },
{ 2.080362f, 3.006572f, 3.828426f, 4.242640f, 3.828426f, 3.006572f, 2.080362f },
{ 2.242640f, 3.242640f, 4.242640f, 5.000000f, 4.242640f, 3.242640f, 2.242640f },
{ 2.080362f, 3.006572f, 3.828426f, 4.242640f, 3.828426f, 3.006572f, 2.080362f },
{ 1.637089f, 2.414213f, 3.006572f, 3.242640f, 3.006572f, 2.414213f, 1.637089f },
{ 1.000000f, 1.637089f, 2.080362f, 2.242640f, 2.080362f, 1.637089f, 1.000000f }
};
for (int y = 0; y < 7; y++)
{
const uint32_t py = wrap_y(by * 4 + y - 1);
for (uint32_t x = 0; x < 7; x++)
{
const uint32_t px = wrap_x(bx * 4 + x - 1);
const color_rgba& orig_c = orig_img(px, py);
vec3F color(orig_c[0], orig_c[1], orig_c[2]);
uint32_t c = quant_colors[0].squared_distance(color) > quant_colors[1].squared_distance(color);
const float weight = s_weights[y][x];
new_colors[c] += color * weight;
total_weight[c] += weight;
}
}
if (!total_weight[0] || !total_weight[1])
success = false;
quant_colors[0] = new_colors[0] / (float)total_weight[0];
quant_colors[1] = new_colors[1] / (float)total_weight[1];
}
if (!success)
{
quant_colors[0] = c_avg_orig;
quant_colors[1] = c_avg_orig;
}
vec4F colors[2] = { quant_colors[0], quant_colors[1] };
colors[0] += vec3F(.5f);
colors[1] += vec3F(.5f);
color_rgba color_0((int)colors[0][0], (int)colors[0][1], (int)colors[0][2], 0);
color_rgba color_1((int)colors[1][0], (int)colors[1][1], (int)colors[1][2], 0);
pvrtc4_block cur_blocks[3][3];
for (int y = -1; y <= 1; y++)
{
for (int x = -1; x <= 1; x++)
{
const uint32_t block_x = wrap_block_x(bx + x);
const uint32_t block_y = wrap_block_y(by + y);
cur_blocks[x + 1][y + 1] = m_blocks(block_x, block_y);
}
}
color_rgba l1(0), h1(0);
l1[0] = g_pvrtc_5_nearest[color_0[0]];
h1[0] = g_pvrtc_5_nearest[color_1[0]];
l1[1] = g_pvrtc_5_nearest[color_0[1]];
h1[1] = g_pvrtc_5_nearest[color_1[1]];
l1[2] = g_pvrtc_4_nearest[color_0[2]];
h1[2] = g_pvrtc_5_nearest[color_0[2]];
l1[3] = 0;
h1[3] = 0;
m_blocks(bx, by).set_endpoint_raw(0, l1, true);
m_blocks(bx, by).set_endpoint_raw(1, h1, true);
uint64_t e03_err_0 = remap_pixels_influenced_by_endpoint(bx, by, orig_img, perceptual, false);
pvrtc4_block blocks0[3][3];
for (int y = -1; y <= 1; y++)
{
for (int x = -1; x <= 1; x++)
{
const uint32_t block_x = wrap_block_x(bx + x);
const uint32_t block_y = wrap_block_y(by + y);
blocks0[x + 1][y + 1] = m_blocks(block_x, block_y);
}
}
l1[0] = g_pvrtc_5_nearest[color_1[0]];
h1[0] = g_pvrtc_5_nearest[color_0[0]];
l1[1] = g_pvrtc_5_nearest[color_1[1]];
h1[1] = g_pvrtc_5_nearest[color_0[1]];
l1[2] = g_pvrtc_4_nearest[color_1[2]];
h1[2] = g_pvrtc_5_nearest[color_0[2]];
l1[3] = 0;
h1[3] = 0;
m_blocks(bx, by).set_endpoint_raw(0, l1, true);
m_blocks(bx, by).set_endpoint_raw(1, h1, true);
uint64_t e03_err_1 = remap_pixels_influenced_by_endpoint(bx, by, orig_img, perceptual, false);
if (initial_error < basisu::min(e03_err_0, e03_err_1))
{
for (int y = -1; y <= 1; y++)
{
for (int x = -1; x <= 1; x++)
{
const uint32_t block_x = wrap_block_x(bx + x);
const uint32_t block_y = wrap_block_y(by + y);
m_blocks(block_x, block_y) = cur_blocks[x + 1][y + 1];
}
}
return initial_error;
}
else if (e03_err_0 < e03_err_1)
{
for (int y = -1; y <= 1; y++)
{
for (int x = -1; x <= 1; x++)
{
const uint32_t block_x = wrap_block_x(bx + x);
const uint32_t block_y = wrap_block_y(by + y);
m_blocks(block_x, block_y) = blocks0[x + 1][y + 1];
}
}
assert(e03_err_0 == evaluate_1x1_endpoint_error(bx, by, orig_img, perceptual, false));
return e03_err_0;
}
assert(e03_err_1 == evaluate_1x1_endpoint_error(bx, by, orig_img, perceptual, false));
return e03_err_1;
}
} // basisu