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basis_universal/encoder/basisu_gpu_texture.cpp

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// basisu_gpu_texture.cpp
// Copyright (C) 2019-2026 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_gpu_texture.h"
#include "basisu_enc.h"
#include "basisu_pvrtc1_4.h"
#include "basisu_bc7enc.h"
#include "../transcoder/basisu_astc_hdr_core.h"
#include "../transcoder/basisu_transcoder.h"
#define TINYDDS_IMPLEMENTATION
#include "3rdparty/tinydds.h"
#define BASISU_USE_GOOGLE_ASTC_DECODER (1)
namespace basisu
{
const char* get_dds_format_string(basist::dds_format fmt)
{
switch (fmt)
{
case basist::dds_format::cBC1: return "BC1 (DXT1)";
case basist::dds_format::cBC2: return "BC2 (DXT2/DXT3)";
case basist::dds_format::cBC3: return "BC3 (DXT4/DXT5)";
case basist::dds_format::cBC4: return "BC4 (ATI1/BC4U)";
case basist::dds_format::cBC5: return "BC5 (ATI2/DXN)";
case basist::dds_format::cBC7: return "BC7";
case basist::dds_format::cR5G6B5: return "R5G6B5 (16bpp)";
case basist::dds_format::cA1R5G5B5: return "A1R5G5B5 (16bpp)";
case basist::dds_format::cX1R5G5B5: return "X1R5G5B5 (16bpp)";
case basist::dds_format::cA4R4G4B4: return "A4R4G4B4 (16bpp)";
case basist::dds_format::cX4R4G4B4: return "X4R4G4B4 (16bpp)";
case basist::dds_format::cR8G8B8: return "R8G8B8 (24bpp, BGR in memory)";
case basist::dds_format::cB8G8R8: return "B8G8R8 (24bpp, RGB in memory)";
case basist::dds_format::cA8R8G8B8: return "A8R8G8B8 (32bpp, BGRA in memory)";
case basist::dds_format::cX8R8G8B8: return "X8R8G8B8 (32bpp, BGRX in memory)";
case basist::dds_format::cA8B8G8R8: return "A8B8G8R8 (32bpp, RGBA in memory)";
case basist::dds_format::cX8B8G8R8: return "X8B8G8R8 (32bpp, RGBX in memory)";
case basist::dds_format::cR8: return "R8 (8bpp)";
case basist::dds_format::cR8G8: return "R8G8 (16bpp)";
case basist::dds_format::cA8: return "A8 (8bpp)";
case basist::dds_format::cL8: return "L8 (8bpp luminance)";
case basist::dds_format::cA8L8: return "A8L8 (16bpp luminance+alpha)";
case basist::dds_format::cInvalid:
default: return "Invalid";
}
}
const char* get_texture_format_name(texture_format fmt)
{
switch (fmt)
{
case texture_format::cInvalidTextureFormat: return "Invalid";
case texture_format::cETC1: return "ETC1";
case texture_format::cETC1S: return "ETC1S";
case texture_format::cETC2_RGB: return "ETC2_RGB";
case texture_format::cETC2_RGBA: return "ETC2_RGBA";
case texture_format::cETC2_ALPHA: return "ETC2_ALPHA";
case texture_format::cBC1: return "BC1";
case texture_format::cBC3: return "BC3";
case texture_format::cBC4: return "BC4";
case texture_format::cBC5: return "BC5";
case texture_format::cBC6HSigned: return "BC6H_Signed";
case texture_format::cBC6HUnsigned: return "BC6H_Unsigned";
case texture_format::cBC7: return "BC7";
case texture_format::cASTC_LDR_4x4: return "ASTC_LDR_4x4";
case texture_format::cASTC_HDR_4x4: return "ASTC_HDR_4x4";
case texture_format::cASTC_HDR_6x6: return "ASTC_HDR_6x6";
case texture_format::cPVRTC1_4_RGB: return "PVRTC1_4_RGB";
case texture_format::cPVRTC1_4_RGBA: return "PVRTC1_4_RGBA";
case texture_format::cATC_RGB: return "ATC_RGB";
case texture_format::cATC_RGBA_INTERPOLATED_ALPHA: return "ATC_RGBA_INTERPOLATED_ALPHA";
case texture_format::cFXT1_RGB: return "FXT1_RGB";
case texture_format::cPVRTC2_4_RGBA: return "PVRTC2_4_RGBA";
case texture_format::cETC2_R11_EAC: return "ETC2_R11_EAC";
case texture_format::cETC2_RG11_EAC: return "ETC2_RG11_EAC";
case texture_format::cUASTC4x4: return "UASTC4x4";
case texture_format::cUASTC_HDR_4x4: return "UASTC_HDR_4x4";
case texture_format::cBC1_NV: return "BC1_NV";
case texture_format::cBC1_AMD: return "BC1_AMD";
case texture_format::cRGBA32: return "RGBA32";
case texture_format::cRGB565: return "RGB565";
case texture_format::cBGR565: return "BGR565";
case texture_format::cRGBA4444: return "RGBA4444";
case texture_format::cABGR4444: return "ABGR4444";
case texture_format::cRGBA_HALF: return "RGBA_HALF";
case texture_format::cRGB_HALF: return "RGB_HALF";
case texture_format::cRGB_9E5: return "RGB_9E5";
case texture_format::cASTC_LDR_5x4: return "ASTC_LDR_5x4";
case texture_format::cASTC_LDR_5x5: return "ASTC_LDR_5x5";
case texture_format::cASTC_LDR_6x5: return "ASTC_LDR_6x5";
case texture_format::cASTC_LDR_6x6: return "ASTC_LDR_6x6";
case texture_format::cASTC_LDR_8x5: return "ASTC_LDR_8x5";
case texture_format::cASTC_LDR_8x6: return "ASTC_LDR_8x6";
case texture_format::cASTC_LDR_10x5: return "ASTC_LDR_10x5";
case texture_format::cASTC_LDR_10x6: return "ASTC_LDR_10x6";
case texture_format::cASTC_LDR_8x8: return "ASTC_LDR_8x8";
case texture_format::cASTC_LDR_10x8: return "ASTC_LDR_10x8";
case texture_format::cASTC_LDR_10x10: return "ASTC_LDR_10x10";
case texture_format::cASTC_LDR_12x10: return "ASTC_LDR_12x10";
case texture_format::cASTC_LDR_12x12: return "ASTC_LDR_12x12";
default: break;
}
return "?";
}
//------------------------------------------------------------------------------------------------
// ETC2 EAC
void unpack_etc2_eac(const void* pBlock_bits, color_rgba* pPixels)
{
static_assert(sizeof(eac_a8_block) == 8, "sizeof(eac_a8_block) == 8");
const eac_a8_block* pBlock = static_cast<const eac_a8_block*>(pBlock_bits);
const int8_t* pTable = g_etc2_eac_tables[pBlock->m_table];
const uint64_t selector_bits = pBlock->get_selector_bits();
const int32_t base = pBlock->m_base;
const int32_t mul = pBlock->m_multiplier;
pPixels[0].a = clamp255(base + pTable[pBlock->get_selector(0, 0, selector_bits)] * mul);
pPixels[1].a = clamp255(base + pTable[pBlock->get_selector(1, 0, selector_bits)] * mul);
pPixels[2].a = clamp255(base + pTable[pBlock->get_selector(2, 0, selector_bits)] * mul);
pPixels[3].a = clamp255(base + pTable[pBlock->get_selector(3, 0, selector_bits)] * mul);
pPixels[4].a = clamp255(base + pTable[pBlock->get_selector(0, 1, selector_bits)] * mul);
pPixels[5].a = clamp255(base + pTable[pBlock->get_selector(1, 1, selector_bits)] * mul);
pPixels[6].a = clamp255(base + pTable[pBlock->get_selector(2, 1, selector_bits)] * mul);
pPixels[7].a = clamp255(base + pTable[pBlock->get_selector(3, 1, selector_bits)] * mul);
pPixels[8].a = clamp255(base + pTable[pBlock->get_selector(0, 2, selector_bits)] * mul);
pPixels[9].a = clamp255(base + pTable[pBlock->get_selector(1, 2, selector_bits)] * mul);
pPixels[10].a = clamp255(base + pTable[pBlock->get_selector(2, 2, selector_bits)] * mul);
pPixels[11].a = clamp255(base + pTable[pBlock->get_selector(3, 2, selector_bits)] * mul);
pPixels[12].a = clamp255(base + pTable[pBlock->get_selector(0, 3, selector_bits)] * mul);
pPixels[13].a = clamp255(base + pTable[pBlock->get_selector(1, 3, selector_bits)] * mul);
pPixels[14].a = clamp255(base + pTable[pBlock->get_selector(2, 3, selector_bits)] * mul);
pPixels[15].a = clamp255(base + pTable[pBlock->get_selector(3, 3, selector_bits)] * mul);
}
//------------------------------------------------------------------------------------------------
// BC1
#if 0
struct bc1_block
{
enum { cTotalEndpointBytes = 2, cTotalSelectorBytes = 4 };
uint8_t m_low_color[cTotalEndpointBytes];
uint8_t m_high_color[cTotalEndpointBytes];
uint8_t m_selectors[cTotalSelectorBytes];
inline uint32_t get_high_color() const { return m_high_color[0] | (m_high_color[1] << 8U); }
inline uint32_t get_low_color() const { return m_low_color[0] | (m_low_color[1] << 8U); }
static void unpack_color(uint32_t c, uint32_t& r, uint32_t& g, uint32_t& b)
{
r = (c >> 11) & 31;
g = (c >> 5) & 63;
b = c & 31;
r = (r << 3) | (r >> 2);
g = (g << 2) | (g >> 4);
b = (b << 3) | (b >> 2);
}
inline uint32_t get_selector(uint32_t x, uint32_t y) const { assert((x < 4U) && (y < 4U)); return (m_selectors[y] >> (x * 2)) & 3; }
};
#endif
bool unpack_bc1_nv(const void* pBlock_bits, color_rgba* pPixels, bool set_alpha)
{
static_assert(sizeof(basist::bc1_block) == 8, "sizeof(bc1_block) == 8");
const basist::bc1_block* pBlock = static_cast<const basist::bc1_block*>(pBlock_bits);
const uint32_t l = pBlock->get_low_color();
const uint32_t h = pBlock->get_high_color();
color_rgba c[4];
int r0 = (l >> 11) & 31;
int g0 = (l >> 5) & 63;
int b0 = l & 31;
int r1 = (h >> 11) & 31;
int g1 = (h >> 5) & 63;
int b1 = h & 31;
c[0].b = (uint8_t)((3 * b0 * 22) / 8);
c[0].g = (uint8_t)((g0 << 2) | (g0 >> 4));
c[0].r = (uint8_t)((3 * r0 * 22) / 8);
c[0].a = 0xFF;
c[1].r = (uint8_t)((3 * r1 * 22) / 8);
c[1].g = (uint8_t)((g1 << 2) | (g1 >> 4));
c[1].b = (uint8_t)((3 * b1 * 22) / 8);
c[1].a = 0xFF;
int gdiff = c[1].g - c[0].g;
bool used_punchthrough = false;
if (l > h)
{
c[2].r = (uint8_t)(((2 * r0 + r1) * 22) / 8);
c[2].g = (uint8_t)(((256 * c[0].g + gdiff / 4 + 128 + gdiff * 80) / 256));
c[2].b = (uint8_t)(((2 * b0 + b1) * 22) / 8);
c[2].a = 0xFF;
c[3].r = (uint8_t)(((2 * r1 + r0) * 22) / 8);
c[3].g = (uint8_t)((256 * c[1].g - gdiff / 4 + 128 - gdiff * 80) / 256);
c[3].b = (uint8_t)(((2 * b1 + b0) * 22) / 8);
c[3].a = 0xFF;
}
else
{
c[2].r = (uint8_t)(((r0 + r1) * 33) / 8);
c[2].g = (uint8_t)((256 * c[0].g + gdiff / 4 + 128 + gdiff * 128) / 256);
c[2].b = (uint8_t)(((b0 + b1) * 33) / 8);
c[2].a = 0xFF;
c[3].set_noclamp_rgba(0, 0, 0, 0);
used_punchthrough = true;
}
if (set_alpha)
{
for (uint32_t y = 0; y < 4; y++, pPixels += 4)
{
pPixels[0] = c[pBlock->get_selector(0, y)];
pPixels[1] = c[pBlock->get_selector(1, y)];
pPixels[2] = c[pBlock->get_selector(2, y)];
pPixels[3] = c[pBlock->get_selector(3, y)];
}
}
else
{
for (uint32_t y = 0; y < 4; y++, pPixels += 4)
{
pPixels[0].set_rgb(c[pBlock->get_selector(0, y)]);
pPixels[1].set_rgb(c[pBlock->get_selector(1, y)]);
pPixels[2].set_rgb(c[pBlock->get_selector(2, y)]);
pPixels[3].set_rgb(c[pBlock->get_selector(3, y)]);
}
}
return used_punchthrough;
}
static inline int interp_5_6_amd(int c0, int c1) { assert(c0 < 256 && c1 < 256); return (c0 * 43 + c1 * 21 + 32) >> 6; }
static inline int interp_half_5_6_amd(int c0, int c1) { assert(c0 < 256 && c1 < 256); return (c0 + c1 + 1) >> 1; }
bool unpack_bc1_amd(const void* pBlock_bits, color_rgba* pPixels, bool set_alpha)
{
const basist::bc1_block* pBlock = static_cast<const basist::bc1_block*>(pBlock_bits);
const uint32_t l = pBlock->get_low_color();
const uint32_t h = pBlock->get_high_color();
color_rgba c[4];
uint32_t r0, g0, b0, r1, g1, b1;
basist::bc1_block::unpack_color(l, r0, g0, b0);
basist::bc1_block::unpack_color(h, r1, g1, b1);
c[0].set_noclamp_rgba(r0, g0, b0, 255);
c[1].set_noclamp_rgba(r1, g1, b1, 255);
bool used_punchthrough = false;
if (l > h)
{
c[2].set_noclamp_rgba(interp_5_6_amd(r0, r1), interp_5_6_amd(g0, g1), interp_5_6_amd(b0, b1), 255);
c[3].set_noclamp_rgba(interp_5_6_amd(r1, r0), interp_5_6_amd(g1, g0), interp_5_6_amd(b1, b0), 255);
}
else
{
c[2].set_noclamp_rgba(interp_half_5_6_amd(r0, r1), interp_half_5_6_amd(g0, g1), interp_half_5_6_amd(b0, b1), 255);
c[3].set_noclamp_rgba(0, 0, 0, 0);
used_punchthrough = true;
}
if (set_alpha)
{
for (uint32_t y = 0; y < 4; y++, pPixels += 4)
{
pPixels[0] = c[pBlock->get_selector(0, y)];
pPixels[1] = c[pBlock->get_selector(1, y)];
pPixels[2] = c[pBlock->get_selector(2, y)];
pPixels[3] = c[pBlock->get_selector(3, y)];
}
}
else
{
for (uint32_t y = 0; y < 4; y++, pPixels += 4)
{
pPixels[0].set_rgb(c[pBlock->get_selector(0, y)]);
pPixels[1].set_rgb(c[pBlock->get_selector(1, y)]);
pPixels[2].set_rgb(c[pBlock->get_selector(2, y)]);
pPixels[3].set_rgb(c[pBlock->get_selector(3, y)]);
}
}
return used_punchthrough;
}
//------------------------------------------------------------------------------------------------
// ATC isn't officially documented, so I'm assuming these references:
// http://www.guildsoftware.com/papers/2012.Converting.DXTC.to.ATC.pdf
// https://github.com/Triang3l/S3TConv/blob/master/s3tconv_atitc.c
// The paper incorrectly says the ATC lerp factors are 1/3 and 2/3, but they are actually 3/8 and 5/8.
void unpack_atc(const void* pBlock_bits, color_rgba* pPixels)
{
const uint8_t* pBytes = static_cast<const uint8_t*>(pBlock_bits);
const uint16_t color0 = pBytes[0] | (pBytes[1] << 8U);
const uint16_t color1 = pBytes[2] | (pBytes[3] << 8U);
uint32_t sels = pBytes[4] | (pBytes[5] << 8U) | (pBytes[6] << 16U) | (pBytes[7] << 24U);
const bool mode = (color0 & 0x8000) != 0;
color_rgba c[4];
c[0].set((color0 >> 10) & 31, (color0 >> 5) & 31, color0 & 31, 255);
c[0].r = (c[0].r << 3) | (c[0].r >> 2);
c[0].g = (c[0].g << 3) | (c[0].g >> 2);
c[0].b = (c[0].b << 3) | (c[0].b >> 2);
c[3].set((color1 >> 11) & 31, (color1 >> 5) & 63, color1 & 31, 255);
c[3].r = (c[3].r << 3) | (c[3].r >> 2);
c[3].g = (c[3].g << 2) | (c[3].g >> 4);
c[3].b = (c[3].b << 3) | (c[3].b >> 2);
if (mode)
{
c[1].set(basisu::maximum(0, c[0].r - (c[3].r >> 2)), basisu::maximum(0, c[0].g - (c[3].g >> 2)), basisu::maximum(0, c[0].b - (c[3].b >> 2)), 255);
c[2] = c[0];
c[0].set(0, 0, 0, 255);
}
else
{
c[1].r = (c[0].r * 5 + c[3].r * 3) >> 3;
c[1].g = (c[0].g * 5 + c[3].g * 3) >> 3;
c[1].b = (c[0].b * 5 + c[3].b * 3) >> 3;
c[2].r = (c[0].r * 3 + c[3].r * 5) >> 3;
c[2].g = (c[0].g * 3 + c[3].g * 5) >> 3;
c[2].b = (c[0].b * 3 + c[3].b * 5) >> 3;
}
for (uint32_t i = 0; i < 16; i++)
{
const uint32_t s = sels & 3;
pPixels[i] = c[s];
sels >>= 2;
}
}
static inline int bc6h_sign_extend(int val, int bits)
{
assert((bits >= 1) && (bits < 32));
assert((val >= 0) && (val < (1 << bits)));
return (val << (32 - bits)) >> (32 - bits);
}
static inline int bc6h_apply_delta(int base, int delta, int num_bits, int is_signed)
{
int bitmask = ((1 << num_bits) - 1);
int v = (base + delta) & bitmask;
return is_signed ? bc6h_sign_extend(v, num_bits) : v;
}
static int bc6h_dequantize(int val, int bits, int is_signed)
{
int result;
if (is_signed)
{
if (bits >= 16)
result = val;
else
{
int s_flag = 0;
if (val < 0)
{
s_flag = 1;
val = -val;
}
if (val == 0)
result = 0;
else if (val >= ((1 << (bits - 1)) - 1))
result = 0x7FFF;
else
result = ((val << 15) + 0x4000) >> (bits - 1);
if (s_flag)
result = -result;
}
}
else
{
if (bits >= 15)
result = val;
else if (!val)
result = 0;
else if (val == ((1 << bits) - 1))
result = 0xFFFF;
else
result = ((val << 16) + 0x8000) >> bits;
}
return result;
}
static inline int bc6h_interpolate(int a, int b, const uint8_t* pWeights, int index)
{
return (a * (64 - (int)pWeights[index]) + b * (int)pWeights[index] + 32) >> 6;
}
static inline basist::half_float bc6h_convert_to_half(int val, int is_signed)
{
if (!is_signed)
{
// scale by 31/64
return (basist::half_float)((val * 31) >> 6);
}
// scale by 31/32
val = (val < 0) ? -(((-val) * 31) >> 5) : (val * 31) >> 5;
int s = 0;
if (val < 0)
{
s = 0x8000;
val = -val;
}
return (basist::half_float)(s | val);
}
static inline uint32_t bc6h_get_bits(uint32_t num_bits, uint64_t& l, uint64_t& h, uint32_t& total_bits)
{
assert((num_bits) && (num_bits <= 63));
uint32_t v = (uint32_t)(l & ((1U << num_bits) - 1U));
l >>= num_bits;
l |= (h << (64U - num_bits));
h >>= num_bits;
total_bits += num_bits;
assert(total_bits <= 128);
return v;
}
static inline uint32_t bc6h_reverse_bits(uint32_t v, uint32_t num_bits)
{
uint32_t res = 0;
for (uint32_t i = 0; i < num_bits; i++)
{
uint32_t bit = (v & (1u << i)) != 0u;
res |= (bit << (num_bits - 1u - i));
}
return res;
}
static inline uint64_t bc6h_read_le_qword(const void* p)
{
const uint8_t* pSrc = static_cast<const uint8_t*>(p);
return ((uint64_t)read_le_dword(pSrc)) | (((uint64_t)read_le_dword(pSrc + sizeof(uint32_t))) << 32U);
}
bool unpack_bc6h(const void* pSrc_block, void* pDst_block, bool is_signed, uint32_t dest_pitch_in_halfs)
{
assert(dest_pitch_in_halfs >= 4 * 3);
const uint32_t MAX_SUBSETS = 2, MAX_COMPS = 3;
const uint8_t* pSrc = static_cast<const uint8_t*>(pSrc_block);
basist::half_float* pDst = static_cast<basist::half_float*>(pDst_block);
uint64_t blo = bc6h_read_le_qword(pSrc), bhi = bc6h_read_le_qword(pSrc + sizeof(uint64_t));
// Unpack mode
const int mode = basist::g_bc6h_mode_lookup[blo & 31];
if (mode < 0)
{
for (int y = 0; y < 4; y++)
{
memset(pDst, 0, sizeof(basist::half_float) * 4);
pDst += dest_pitch_in_halfs;
}
return false;
}
// Skip mode bits
uint32_t total_bits_read = 0;
bc6h_get_bits((mode < 2) ? 2 : 5, blo, bhi, total_bits_read);
assert(mode < (int)basist::NUM_BC6H_MODES);
const uint32_t num_subsets = (mode >= 10) ? 1 : 2;
const bool is_mode_9_or_10 = (mode == 9) || (mode == 10);
// Unpack endpoint components
int comps[MAX_SUBSETS][MAX_COMPS][2] = { { { 0 } } }; // [subset][comp][l/h]
int part_index = 0;
uint32_t layout_index = 0;
while (layout_index < basist::MAX_BC6H_LAYOUT_INDEX)
{
const basist::bc6h_bit_layout& layout = basist::g_bc6h_bit_layouts[mode][layout_index];
if (layout.m_comp < 0)
break;
const int subset = layout.m_index >> 1, lh_index = layout.m_index & 1;
assert((layout.m_comp == 3) || ((subset >= 0) && (subset < (int)MAX_SUBSETS)));
const int last_bit = layout.m_last_bit, first_bit = layout.m_first_bit;
assert(last_bit >= 0);
int& res = (layout.m_comp == 3) ? part_index : comps[subset][layout.m_comp][lh_index];
if (first_bit < 0)
{
res |= (bc6h_get_bits(1, blo, bhi, total_bits_read) << last_bit);
}
else
{
const int total_bits = iabs(last_bit - first_bit) + 1;
const int bit_shift = basisu::minimum(first_bit, last_bit);
int b = bc6h_get_bits(total_bits, blo, bhi, total_bits_read);
if (last_bit < first_bit)
b = bc6h_reverse_bits(b, total_bits);
res |= (b << bit_shift);
}
layout_index++;
}
assert(layout_index != basist::MAX_BC6H_LAYOUT_INDEX);
// Sign extend/dequantize endpoints
const int num_sig_bits = basist::g_bc6h_mode_sig_bits[mode][0];
if (is_signed)
{
for (uint32_t comp = 0; comp < 3; comp++)
comps[0][comp][0] = bc6h_sign_extend(comps[0][comp][0], num_sig_bits);
}
if (is_signed || !is_mode_9_or_10)
{
for (uint32_t subset = 0; subset < num_subsets; subset++)
for (uint32_t comp = 0; comp < 3; comp++)
for (uint32_t lh = (subset ? 0 : 1); lh < 2; lh++)
comps[subset][comp][lh] = bc6h_sign_extend(comps[subset][comp][lh], basist::g_bc6h_mode_sig_bits[mode][1 + comp]);
}
if (!is_mode_9_or_10)
{
for (uint32_t subset = 0; subset < num_subsets; subset++)
for (uint32_t comp = 0; comp < 3; comp++)
for (uint32_t lh = (subset ? 0 : 1); lh < 2; lh++)
comps[subset][comp][lh] = bc6h_apply_delta(comps[0][comp][0], comps[subset][comp][lh], num_sig_bits, is_signed);
}
for (uint32_t subset = 0; subset < num_subsets; subset++)
for (uint32_t comp = 0; comp < 3; comp++)
for (uint32_t lh = 0; lh < 2; lh++)
comps[subset][comp][lh] = bc6h_dequantize(comps[subset][comp][lh], num_sig_bits, is_signed);
// Now unpack weights and output texels
const int weight_bits = (mode >= 10) ? 4 : 3;
const uint8_t* pWeights = (mode >= 10) ? basist::g_bc6h_weight4 : basist::g_bc6h_weight3;
dest_pitch_in_halfs -= 4 * 3;
for (uint32_t y = 0; y < 4; y++)
{
for (uint32_t x = 0; x < 4; x++)
{
int subset = (num_subsets == 1) ? ((x | y) ? 0 : 0x80) : basist::g_bc6h_2subset_patterns[part_index][y][x];
const int num_bits = weight_bits + ((subset & 0x80) ? -1 : 0);
subset &= 1;
const int weight_index = bc6h_get_bits(num_bits, blo, bhi, total_bits_read);
pDst[0] = bc6h_convert_to_half(bc6h_interpolate(comps[subset][0][0], comps[subset][0][1], pWeights, weight_index), is_signed);
pDst[1] = bc6h_convert_to_half(bc6h_interpolate(comps[subset][1][0], comps[subset][1][1], pWeights, weight_index), is_signed);
pDst[2] = bc6h_convert_to_half(bc6h_interpolate(comps[subset][2][0], comps[subset][2][1], pWeights, weight_index), is_signed);
pDst += 3;
}
pDst += dest_pitch_in_halfs;
}
assert(total_bits_read == 128);
return true;
}
//------------------------------------------------------------------------------------------------
// FXT1 (for fun, and because some modern Intel parts support it, and because a subset is like BC1)
struct fxt1_block
{
union
{
struct
{
uint64_t m_t00 : 2;
uint64_t m_t01 : 2;
uint64_t m_t02 : 2;
uint64_t m_t03 : 2;
uint64_t m_t04 : 2;
uint64_t m_t05 : 2;
uint64_t m_t06 : 2;
uint64_t m_t07 : 2;
uint64_t m_t08 : 2;
uint64_t m_t09 : 2;
uint64_t m_t10 : 2;
uint64_t m_t11 : 2;
uint64_t m_t12 : 2;
uint64_t m_t13 : 2;
uint64_t m_t14 : 2;
uint64_t m_t15 : 2;
uint64_t m_t16 : 2;
uint64_t m_t17 : 2;
uint64_t m_t18 : 2;
uint64_t m_t19 : 2;
uint64_t m_t20 : 2;
uint64_t m_t21 : 2;
uint64_t m_t22 : 2;
uint64_t m_t23 : 2;
uint64_t m_t24 : 2;
uint64_t m_t25 : 2;
uint64_t m_t26 : 2;
uint64_t m_t27 : 2;
uint64_t m_t28 : 2;
uint64_t m_t29 : 2;
uint64_t m_t30 : 2;
uint64_t m_t31 : 2;
} m_lo;
uint64_t m_lo_bits;
uint8_t m_sels[8];
};
union
{
struct
{
#ifdef BASISU_USE_ORIGINAL_3DFX_FXT1_ENCODING
// This is the format that 3DFX's DECOMP.EXE tool expects, which I'm assuming is what the actual 3DFX hardware wanted.
// Unfortunately, color0/color1 and color2/color3 are flipped relative to the official OpenGL extension and Intel's documentation!
uint64_t m_b1 : 5;
uint64_t m_g1 : 5;
uint64_t m_r1 : 5;
uint64_t m_b0 : 5;
uint64_t m_g0 : 5;
uint64_t m_r0 : 5;
uint64_t m_b3 : 5;
uint64_t m_g3 : 5;
uint64_t m_r3 : 5;
uint64_t m_b2 : 5;
uint64_t m_g2 : 5;
uint64_t m_r2 : 5;
#else
// Intel's encoding, and the encoding in the OpenGL FXT1 spec.
uint64_t m_b0 : 5;
uint64_t m_g0 : 5;
uint64_t m_r0 : 5;
uint64_t m_b1 : 5;
uint64_t m_g1 : 5;
uint64_t m_r1 : 5;
uint64_t m_b2 : 5;
uint64_t m_g2 : 5;
uint64_t m_r2 : 5;
uint64_t m_b3 : 5;
uint64_t m_g3 : 5;
uint64_t m_r3 : 5;
#endif
uint64_t m_alpha : 1;
uint64_t m_glsb : 2;
uint64_t m_mode : 1;
} m_hi;
uint64_t m_hi_bits;
};
};
static color_rgba expand_565(const color_rgba& c)
{
return color_rgba((c.r << 3) | (c.r >> 2), (c.g << 2) | (c.g >> 4), (c.b << 3) | (c.b >> 2), 255);
}
// We only support CC_MIXED non-alpha blocks here because that's the only mode the transcoder uses at the moment.
bool unpack_fxt1(const void *p, color_rgba *pPixels)
{
const fxt1_block* pBlock = static_cast<const fxt1_block*>(p);
if (pBlock->m_hi.m_mode == 0)
return false;
if (pBlock->m_hi.m_alpha == 1)
return false;
color_rgba colors[4];
colors[0].r = pBlock->m_hi.m_r0;
colors[0].g = (uint8_t)((pBlock->m_hi.m_g0 << 1) | ((pBlock->m_lo.m_t00 >> 1) ^ (pBlock->m_hi.m_glsb & 1)));
colors[0].b = pBlock->m_hi.m_b0;
colors[0].a = 255;
colors[1].r = pBlock->m_hi.m_r1;
colors[1].g = (uint8_t)((pBlock->m_hi.m_g1 << 1) | (pBlock->m_hi.m_glsb & 1));
colors[1].b = pBlock->m_hi.m_b1;
colors[1].a = 255;
colors[2].r = pBlock->m_hi.m_r2;
colors[2].g = (uint8_t)((pBlock->m_hi.m_g2 << 1) | ((pBlock->m_lo.m_t16 >> 1) ^ (pBlock->m_hi.m_glsb >> 1)));
colors[2].b = pBlock->m_hi.m_b2;
colors[2].a = 255;
colors[3].r = pBlock->m_hi.m_r3;
colors[3].g = (uint8_t)((pBlock->m_hi.m_g3 << 1) | (pBlock->m_hi.m_glsb >> 1));
colors[3].b = pBlock->m_hi.m_b3;
colors[3].a = 255;
for (uint32_t i = 0; i < 4; i++)
colors[i] = expand_565(colors[i]);
color_rgba block0_colors[4];
block0_colors[0] = colors[0];
block0_colors[1] = color_rgba((colors[0].r * 2 + colors[1].r + 1) / 3, (colors[0].g * 2 + colors[1].g + 1) / 3, (colors[0].b * 2 + colors[1].b + 1) / 3, 255);
block0_colors[2] = color_rgba((colors[1].r * 2 + colors[0].r + 1) / 3, (colors[1].g * 2 + colors[0].g + 1) / 3, (colors[1].b * 2 + colors[0].b + 1) / 3, 255);
block0_colors[3] = colors[1];
for (uint32_t i = 0; i < 16; i++)
{
const uint32_t sel = (pBlock->m_sels[i >> 2] >> ((i & 3) * 2)) & 3;
const uint32_t x = i & 3;
const uint32_t y = i >> 2;
pPixels[x + y * 8] = block0_colors[sel];
}
color_rgba block1_colors[4];
block1_colors[0] = colors[2];
block1_colors[1] = color_rgba((colors[2].r * 2 + colors[3].r + 1) / 3, (colors[2].g * 2 + colors[3].g + 1) / 3, (colors[2].b * 2 + colors[3].b + 1) / 3, 255);
block1_colors[2] = color_rgba((colors[3].r * 2 + colors[2].r + 1) / 3, (colors[3].g * 2 + colors[2].g + 1) / 3, (colors[3].b * 2 + colors[2].b + 1) / 3, 255);
block1_colors[3] = colors[3];
for (uint32_t i = 0; i < 16; i++)
{
const uint32_t sel = (pBlock->m_sels[4 + (i >> 2)] >> ((i & 3) * 2)) & 3;
const uint32_t x = i & 3;
const uint32_t y = i >> 2;
pPixels[4 + x + y * 8] = block1_colors[sel];
}
return true;
}
//------------------------------------------------------------------------------------------------
// PVRTC2 (non-interpolated, hard_flag=1 modulation=0 subset only!)
struct pvrtc2_block
{
uint8_t m_modulation[4];
union
{
union
{
// Opaque mode: RGB colora=554 and colorb=555
struct
{
uint32_t m_mod_flag : 1;
uint32_t m_blue_a : 4;
uint32_t m_green_a : 5;
uint32_t m_red_a : 5;
uint32_t m_hard_flag : 1;
uint32_t m_blue_b : 5;
uint32_t m_green_b : 5;
uint32_t m_red_b : 5;
uint32_t m_opaque_flag : 1;
} m_opaque_color_data;
// Transparent mode: RGBA colora=4433 and colorb=4443
struct
{
uint32_t m_mod_flag : 1;
uint32_t m_blue_a : 3;
uint32_t m_green_a : 4;
uint32_t m_red_a : 4;
uint32_t m_alpha_a : 3;
uint32_t m_hard_flag : 1;
uint32_t m_blue_b : 4;
uint32_t m_green_b : 4;
uint32_t m_red_b : 4;
uint32_t m_alpha_b : 3;
uint32_t m_opaque_flag : 1;
} m_trans_color_data;
};
uint32_t m_color_data_bits;
};
};
static color_rgba convert_rgb_555_to_888(const color_rgba& col)
{
return color_rgba((col[0] << 3) | (col[0] >> 2), (col[1] << 3) | (col[1] >> 2), (col[2] << 3) | (col[2] >> 2), 255);
}
static color_rgba convert_rgba_5554_to_8888(const color_rgba& col)
{
return color_rgba((col[0] << 3) | (col[0] >> 2), (col[1] << 3) | (col[1] >> 2), (col[2] << 3) | (col[2] >> 2), (col[3] << 4) | col[3]);
}
// PVRTC2 is currently limited to only what our transcoder outputs (non-interpolated, hard_flag=1 modulation=0). In this mode, PVRTC2 looks much like BC1/ATC.
bool unpack_pvrtc2(const void *p, color_rgba *pPixels)
{
const pvrtc2_block* pBlock = static_cast<const pvrtc2_block*>(p);
if ((!pBlock->m_opaque_color_data.m_hard_flag) || (pBlock->m_opaque_color_data.m_mod_flag))
{
// This mode isn't supported by the transcoder, so we aren't bothering with it here.
return false;
}
color_rgba colors[4];
if (pBlock->m_opaque_color_data.m_opaque_flag)
{
// colora=554
color_rgba color_a(pBlock->m_opaque_color_data.m_red_a, pBlock->m_opaque_color_data.m_green_a, (pBlock->m_opaque_color_data.m_blue_a << 1) | (pBlock->m_opaque_color_data.m_blue_a >> 3), 255);
// colora=555
color_rgba color_b(pBlock->m_opaque_color_data.m_red_b, pBlock->m_opaque_color_data.m_green_b, pBlock->m_opaque_color_data.m_blue_b, 255);
colors[0] = convert_rgb_555_to_888(color_a);
colors[3] = convert_rgb_555_to_888(color_b);
colors[1].set((colors[0].r * 5 + colors[3].r * 3) / 8, (colors[0].g * 5 + colors[3].g * 3) / 8, (colors[0].b * 5 + colors[3].b * 3) / 8, 255);
colors[2].set((colors[0].r * 3 + colors[3].r * 5) / 8, (colors[0].g * 3 + colors[3].g * 5) / 8, (colors[0].b * 3 + colors[3].b * 5) / 8, 255);
}
else
{
// colora=4433
color_rgba color_a(
(pBlock->m_trans_color_data.m_red_a << 1) | (pBlock->m_trans_color_data.m_red_a >> 3),
(pBlock->m_trans_color_data.m_green_a << 1) | (pBlock->m_trans_color_data.m_green_a >> 3),
(pBlock->m_trans_color_data.m_blue_a << 2) | (pBlock->m_trans_color_data.m_blue_a >> 1),
pBlock->m_trans_color_data.m_alpha_a << 1);
//colorb=4443
color_rgba color_b(
(pBlock->m_trans_color_data.m_red_b << 1) | (pBlock->m_trans_color_data.m_red_b >> 3),
(pBlock->m_trans_color_data.m_green_b << 1) | (pBlock->m_trans_color_data.m_green_b >> 3),
(pBlock->m_trans_color_data.m_blue_b << 1) | (pBlock->m_trans_color_data.m_blue_b >> 3),
(pBlock->m_trans_color_data.m_alpha_b << 1) | 1);
colors[0] = convert_rgba_5554_to_8888(color_a);
colors[3] = convert_rgba_5554_to_8888(color_b);
}
colors[1].set((colors[0].r * 5 + colors[3].r * 3) / 8, (colors[0].g * 5 + colors[3].g * 3) / 8, (colors[0].b * 5 + colors[3].b * 3) / 8, (colors[0].a * 5 + colors[3].a * 3) / 8);
colors[2].set((colors[0].r * 3 + colors[3].r * 5) / 8, (colors[0].g * 3 + colors[3].g * 5) / 8, (colors[0].b * 3 + colors[3].b * 5) / 8, (colors[0].a * 3 + colors[3].a * 5) / 8);
for (uint32_t i = 0; i < 16; i++)
{
const uint32_t sel = (pBlock->m_modulation[i >> 2] >> ((i & 3) * 2)) & 3;
pPixels[i] = colors[sel];
}
return true;
}
//------------------------------------------------------------------------------------------------
// ETC2 EAC R11 or RG11
struct etc2_eac_r11
{
uint64_t m_base : 8;
uint64_t m_table : 4;
uint64_t m_mul : 4;
uint64_t m_sels_0 : 8;
uint64_t m_sels_1 : 8;
uint64_t m_sels_2 : 8;
uint64_t m_sels_3 : 8;
uint64_t m_sels_4 : 8;
uint64_t m_sels_5 : 8;
uint64_t get_sels() const
{
return ((uint64_t)m_sels_0 << 40U) | ((uint64_t)m_sels_1 << 32U) | ((uint64_t)m_sels_2 << 24U) | ((uint64_t)m_sels_3 << 16U) | ((uint64_t)m_sels_4 << 8U) | m_sels_5;
}
void set_sels(uint64_t v)
{
m_sels_0 = (v >> 40U) & 0xFF;
m_sels_1 = (v >> 32U) & 0xFF;
m_sels_2 = (v >> 24U) & 0xFF;
m_sels_3 = (v >> 16U) & 0xFF;
m_sels_4 = (v >> 8U) & 0xFF;
m_sels_5 = v & 0xFF;
}
};
struct etc2_eac_rg11
{
etc2_eac_r11 m_c[2];
};
void unpack_etc2_eac_r(const void *p, color_rgba* pPixels, uint32_t c)
{
const etc2_eac_r11* pBlock = static_cast<const etc2_eac_r11*>(p);
const uint64_t sels = pBlock->get_sels();
const int base = (int)pBlock->m_base * 8 + 4;
const int mul = pBlock->m_mul ? ((int)pBlock->m_mul * 8) : 1;
const int table = (int)pBlock->m_table;
for (uint32_t y = 0; y < 4; y++)
{
for (uint32_t x = 0; x < 4; x++)
{
const uint32_t shift = 45 - ((y + x * 4) * 3);
const uint32_t sel = (uint32_t)((sels >> shift) & 7);
int val = base + g_etc2_eac_tables[table][sel] * mul;
val = clamp<int>(val, 0, 2047);
// Convert to 8-bits with rounding
//pPixels[x + y * 4].m_comps[c] = static_cast<uint8_t>((val * 255 + 1024) / 2047);
pPixels[x + y * 4].m_comps[c] = static_cast<uint8_t>((val * 255 + 1023) / 2047);
} // x
} // y
}
void unpack_etc2_eac_rg(const void* p, color_rgba* pPixels)
{
for (uint32_t c = 0; c < 2; c++)
{
const etc2_eac_r11* pBlock = &static_cast<const etc2_eac_rg11*>(p)->m_c[c];
unpack_etc2_eac_r(pBlock, pPixels, c);
}
}
//------------------------------------------------------------------------------------------------
// UASTC
void unpack_uastc(const void* p, color_rgba* pPixels)
{
basist::unpack_uastc(*static_cast<const basist::uastc_block*>(p), (basist::color32 *)pPixels, false);
}
// Unpacks to RGBA, R, RG, or A. LDR GPU texture formats only.
// astc_srgb: if true, ASTC LDR formats are decoded in sRGB decode mode, otherwise L8.
bool unpack_block(texture_format fmt, const void* pBlock, color_rgba* pPixels, bool astc_srgb)
{
switch (fmt)
{
case texture_format::cBC1:
{
basist::bcu::unpack_bc1(pBlock, reinterpret_cast<basist::color_rgba*>(pPixels), true);
break;
}
case texture_format::cBC1_NV:
{
unpack_bc1_nv(pBlock, pPixels, true);
break;
}
case texture_format::cBC1_AMD:
{
unpack_bc1_amd(pBlock, pPixels, true);
break;
}
case texture_format::cBC3:
{
// unpack_bc3 is void (always succeeds); fall through to the function's success return.
basist::bcu::unpack_bc3(pBlock, reinterpret_cast<basist::color_rgba*>(pPixels));
break;
}
case texture_format::cBC4:
{
// Unpack to R
basist::bcu::unpack_bc4(pBlock, &pPixels[0].r, sizeof(color_rgba));
break;
}
case texture_format::cBC5:
{
basist::bcu::unpack_bc5(pBlock, reinterpret_cast<basist::color_rgba*>(pPixels));
break;
}
case texture_format::cBC7:
{
return basist::bc7u::unpack_bc7(pBlock, reinterpret_cast<basist::color_rgba *>(pPixels));
}
// Full ETC2 color blocks (planar/T/H modes) is currently unsupported in basisu, but we do support ETC2 with alpha (using ETC1 for color)
case texture_format::cETC2_RGB:
case texture_format::cETC1:
case texture_format::cETC1S:
{
return unpack_etc1(*static_cast<const etc_block*>(pBlock), pPixels);
}
case texture_format::cETC2_RGBA:
{
if (!unpack_etc1(static_cast<const etc_block*>(pBlock)[1], pPixels))
return false;
unpack_etc2_eac(pBlock, pPixels);
break;
}
case texture_format::cETC2_ALPHA:
{
// Unpack to A
unpack_etc2_eac(pBlock, pPixels);
break;
}
case texture_format::cBC6HSigned:
case texture_format::cBC6HUnsigned:
case texture_format::cASTC_HDR_4x4:
case texture_format::cUASTC_HDR_4x4:
case texture_format::cASTC_HDR_6x6:
{
// Can't unpack HDR blocks in unpack_block() because it returns 32bpp pixel data.
assert(0);
return false;
}
case texture_format::cASTC_LDR_4x4:
case texture_format::cASTC_LDR_5x4:
case texture_format::cASTC_LDR_5x5:
case texture_format::cASTC_LDR_6x5:
case texture_format::cASTC_LDR_6x6:
case texture_format::cASTC_LDR_8x5:
case texture_format::cASTC_LDR_8x6:
case texture_format::cASTC_LDR_10x5:
case texture_format::cASTC_LDR_10x6:
case texture_format::cASTC_LDR_8x8:
case texture_format::cASTC_LDR_10x8:
case texture_format::cASTC_LDR_10x10:
case texture_format::cASTC_LDR_12x10:
case texture_format::cASTC_LDR_12x12:
{
const uint32_t block_width = get_block_width(fmt), block_height = get_block_height(fmt);
assert(get_astc_ldr_texture_format(block_width, block_height) == fmt);
assert(astc_helpers::is_valid_block_size(block_width, block_height));
// TODO: Allow caller to use the Android decoder, too.
bool status = basisu_astc::astc::decompress_ldr(reinterpret_cast<uint8_t*>(pPixels), static_cast<const uint8_t*>(pBlock), astc_srgb, block_width, block_height);
assert(status);
if (!status)
return false;
break;
}
case texture_format::cATC_RGB:
{
unpack_atc(pBlock, pPixels);
break;
}
case texture_format::cATC_RGBA_INTERPOLATED_ALPHA:
{
unpack_atc(static_cast<const uint8_t*>(pBlock) + 8, pPixels);
basist::bcu::unpack_bc4(pBlock, &pPixels[0].a, sizeof(color_rgba));
break;
}
case texture_format::cFXT1_RGB:
{
unpack_fxt1(pBlock, pPixels);
break;
}
case texture_format::cPVRTC2_4_RGBA:
{
unpack_pvrtc2(pBlock, pPixels);
break;
}
case texture_format::cETC2_R11_EAC:
{
unpack_etc2_eac_r(static_cast<const etc2_eac_r11 *>(pBlock), pPixels, 0);
break;
}
case texture_format::cETC2_RG11_EAC:
{
unpack_etc2_eac_rg(pBlock, pPixels);
break;
}
case texture_format::cUASTC4x4:
{
unpack_uastc(pBlock, pPixels);
break;
}
default:
{
assert(0);
// TODO
return false;
}
}
return true;
}
bool unpack_block_hdr(texture_format fmt, const void* pBlock, vec4F* pPixels)
{
switch (fmt)
{
case texture_format::cASTC_HDR_6x6:
{
#if BASISU_USE_GOOGLE_ASTC_DECODER
bool status = basisu_astc::astc::decompress_hdr(&pPixels[0][0], (uint8_t*)pBlock, 6, 6);
assert(status);
if (!status)
return false;
#else
// Use our decoder
basist::half_float half_block[6 * 6][4];
astc_helpers::log_astc_block log_blk;
if (!astc_helpers::unpack_block(pBlock, log_blk, 6, 6))
return false;
if (!astc_helpers::decode_block(log_blk, half_block, 6, 6, astc_helpers::cDecodeModeHDR16))
return false;
for (uint32_t p = 0; p < (6 * 6); p++)
{
pPixels[p][0] = basist::half_to_float(half_block[p][0]);
pPixels[p][1] = basist::half_to_float(half_block[p][1]);
pPixels[p][2] = basist::half_to_float(half_block[p][2]);
pPixels[p][3] = basist::half_to_float(half_block[p][3]);
}
#endif
return true;
}
case texture_format::cASTC_HDR_4x4:
case texture_format::cUASTC_HDR_4x4:
{
#if BASISU_USE_GOOGLE_ASTC_DECODER
// Use Google's decoder
bool status = basisu_astc::astc::decompress_hdr(&pPixels[0][0], (uint8_t*)pBlock, 4, 4);
assert(status);
if (!status)
return false;
#else
// Use our decoder
basist::half_float half_block[16][4];
astc_helpers::log_astc_block log_blk;
if (!astc_helpers::unpack_block(pBlock, log_blk, 4, 4))
return false;
if (!astc_helpers::decode_block(log_blk, half_block, 4, 4, astc_helpers::cDecodeModeHDR16))
return false;
for (uint32_t p = 0; p < 16; p++)
{
pPixels[p][0] = basist::half_to_float(half_block[p][0]);
pPixels[p][1] = basist::half_to_float(half_block[p][1]);
pPixels[p][2] = basist::half_to_float(half_block[p][2]);
pPixels[p][3] = basist::half_to_float(half_block[p][3]);
}
//memset(pPixels, 0, sizeof(vec4F) * 16);
#endif
return true;
}
case texture_format::cBC6HSigned:
case texture_format::cBC6HUnsigned:
{
basist::half_float half_block[16][3];
unpack_bc6h(pBlock, half_block, fmt == texture_format::cBC6HSigned);
for (uint32_t p = 0; p < 16; p++)
{
pPixels[p][0] = basist::half_to_float(half_block[p][0]);
pPixels[p][1] = basist::half_to_float(half_block[p][1]);
pPixels[p][2] = basist::half_to_float(half_block[p][2]);
pPixels[p][3] = 1.0f;
}
return true;
}
default:
{
break;
}
}
assert(0);
return false;
}
bool gpu_image::unpack(image& img, bool astc_srgb) const
{
img.resize(get_pixel_width(), get_pixel_height());
img.set_all(g_black_color);
if (!img.get_width() || !img.get_height())
return true;
if ((m_fmt == texture_format::cPVRTC1_4_RGB) || (m_fmt == texture_format::cPVRTC1_4_RGBA))
{
pvrtc4_image pi(m_width, m_height);
if (get_total_blocks() != pi.get_total_blocks())
return false;
memcpy((void *)&pi.get_blocks()[0], (const void *)get_ptr(), get_size_in_bytes());
pi.deswizzle();
pi.unpack_all_pixels(img);
return true;
}
assert((m_block_width <= cMaxBlockSize) && (m_block_height <= cMaxBlockSize));
color_rgba pixels[cMaxBlockSize * cMaxBlockSize];
// Notice here we default all texels to (0,0,0,255) - some block unpackers like BC4/5 only write certain channels.
for (uint32_t i = 0; i < cMaxBlockSize * cMaxBlockSize; i++)
pixels[i] = g_black_color;
bool success = true;
for (uint32_t by = 0; by < m_blocks_y; by++)
{
for (uint32_t bx = 0; bx < m_blocks_x; bx++)
{
const void* pBlock = get_block_ptr(bx, by);
if (!unpack_block(m_fmt, pBlock, pixels, astc_srgb))
success = false;
img.set_block_clipped(pixels, bx * m_block_width, by * m_block_height, m_block_width, m_block_height);
} // bx
} // by
return success;
}
bool gpu_image::unpack_hdr(imagef& img) const
{
if ((m_fmt != texture_format::cASTC_HDR_4x4) && (m_fmt != texture_format::cUASTC_HDR_4x4) && (m_fmt != texture_format::cASTC_HDR_6x6) &&
(m_fmt != texture_format::cBC6HUnsigned) && (m_fmt != texture_format::cBC6HSigned))
{
// Can't call on LDR images, at least currently. (Could unpack the LDR data and convert to float.)
assert(0);
return false;
}
img.resize(get_pixel_width(), get_pixel_height());
img.set_all(vec4F(0.0f));
if (!img.get_width() || !img.get_height())
return true;
assert((m_block_width <= cMaxBlockSize) && (m_block_height <= cMaxBlockSize));
vec4F pixels[cMaxBlockSize * cMaxBlockSize];
clear_obj(pixels);
bool success = true;
for (uint32_t by = 0; by < m_blocks_y; by++)
{
for (uint32_t bx = 0; bx < m_blocks_x; bx++)
{
const void* pBlock = get_block_ptr(bx, by);
if (!unpack_block_hdr(m_fmt, pBlock, pixels))
success = false;
img.set_block_clipped(pixels, bx * m_block_width, by * m_block_height, m_block_width, m_block_height);
} // bx
} // by
return success;
}
// KTX1 texture file writing
static const uint8_t g_ktx_file_id[12] = { 0xAB, 0x4B, 0x54, 0x58, 0x20, 0x31, 0x31, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A };
// KTX/GL enums
enum
{
KTX_ENDIAN = 0x04030201,
KTX_OPPOSITE_ENDIAN = 0x01020304,
KTX_ETC1_RGB8_OES = 0x8D64,
KTX_RED = 0x1903,
KTX_RG = 0x8227,
KTX_RGB = 0x1907,
KTX_RGBA = 0x1908,
KTX_COMPRESSED_RGB_S3TC_DXT1_EXT = 0x83F0,
KTX_COMPRESSED_RGBA_S3TC_DXT5_EXT = 0x83F3,
KTX_COMPRESSED_RED_RGTC1_EXT = 0x8DBB,
KTX_COMPRESSED_RED_GREEN_RGTC2_EXT = 0x8DBD,
KTX_COMPRESSED_RGB8_ETC2 = 0x9274,
KTX_COMPRESSED_RGBA8_ETC2_EAC = 0x9278,
KTX_COMPRESSED_RGBA_BPTC_UNORM = 0x8E8C,
KTX_COMPRESSED_SRGB_ALPHA_BPTC_UNORM = 0x8E8D,
KTX_COMPRESSED_RGB_BPTC_SIGNED_FLOAT = 0x8E8E,
KTX_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT = 0x8E8F,
// sRGB GL enums, emitted when exporting an sRGB source (EXT_texture_sRGB / ETC2 / BPTC).
// BC7's sRGB enum is KTX_COMPRESSED_SRGB_ALPHA_BPTC_UNORM = 0x8E8D, already defined above.
KTX_COMPRESSED_SRGB_S3TC_DXT1_EXT = 0x8C4C, // BC1 RGB, sRGB
KTX_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT = 0x8C4F, // BC3, sRGB
KTX_COMPRESSED_SRGB8_ETC2 = 0x9275, // ETC2 RGB, sRGB
KTX_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC = 0x9279, // ETC2 RGBA, sRGB
KTX_COMPRESSED_SRGB_PVRTC_4BPPV1_EXT = 0x8A55, // PVRTC1 4bpp RGB, sRGB (EXT_pvrtc_sRGB)
KTX_COMPRESSED_SRGB_ALPHA_PVRTC_4BPPV1_EXT = 0x8A57, // PVRTC1 4bpp RGBA, sRGB (EXT_pvrtc_sRGB)
KTX_COMPRESSED_RGB_PVRTC_4BPPV1_IMG = 0x8C00,
KTX_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG = 0x8C02,
KTX_COMPRESSED_RGBA_ASTC_4x4_KHR = 0x93B0,
KTX_COMPRESSED_RGBA_ASTC_5x4_KHR = 0x93B1,
KTX_COMPRESSED_RGBA_ASTC_5x5_KHR = 0x93B2,
KTX_COMPRESSED_RGBA_ASTC_6x5_KHR = 0x93B3,
KTX_COMPRESSED_RGBA_ASTC_6x6_KHR = 0x93B4,
KTX_COMPRESSED_RGBA_ASTC_8x5_KHR = 0x93B5,
KTX_COMPRESSED_RGBA_ASTC_8x6_KHR = 0x93B6,
KTX_COMPRESSED_RGBA_ASTC_8x8_KHR = 0x93B7,
KTX_COMPRESSED_RGBA_ASTC_10x5_KHR = 0x93B8,
KTX_COMPRESSED_RGBA_ASTC_10x6_KHR = 0x93B9,
KTX_COMPRESSED_RGBA_ASTC_10x8_KHR = 0x93BA,
KTX_COMPRESSED_RGBA_ASTC_10x10_KHR = 0x93BB,
KTX_COMPRESSED_RGBA_ASTC_12x10_KHR = 0x93BC,
KTX_COMPRESSED_RGBA_ASTC_12x12_KHR = 0x93BD,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR = 0x93D0,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR = 0x93D1,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR = 0x93D2,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR = 0x93D3,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR = 0x93D4,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR = 0x93D5,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR = 0x93D6,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR = 0x93D7,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR = 0x93D8,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR = 0x93D9,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR = 0x93DA,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR = 0x93DB,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR = 0x93DC,
KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR = 0x93DD,
KTX_COMPRESSED_RGBA_UASTC_4x4_KHR = 0x94CC, // TODO - Use proper value!
KTX_ATC_RGB_AMD = 0x8C92,
KTX_ATC_RGBA_INTERPOLATED_ALPHA_AMD = 0x87EE,
KTX_COMPRESSED_RGB_FXT1_3DFX = 0x86B0,
KTX_COMPRESSED_RGBA_FXT1_3DFX = 0x86B1,
KTX_COMPRESSED_RGBA_PVRTC_4BPPV2_IMG = 0x9138,
KTX_COMPRESSED_R11_EAC = 0x9270,
KTX_COMPRESSED_RG11_EAC = 0x9272
};
struct ktx_header
{
uint8_t m_identifier[12];
packed_uint<4> m_endianness;
packed_uint<4> m_glType;
packed_uint<4> m_glTypeSize;
packed_uint<4> m_glFormat;
packed_uint<4> m_glInternalFormat;
packed_uint<4> m_glBaseInternalFormat;
packed_uint<4> m_pixelWidth;
packed_uint<4> m_pixelHeight;
packed_uint<4> m_pixelDepth;
packed_uint<4> m_numberOfArrayElements;
packed_uint<4> m_numberOfFaces;
packed_uint<4> m_numberOfMipmapLevels;
packed_uint<4> m_bytesOfKeyValueData;
void clear() { clear_obj(*this); }
};
// Input is a texture array of mipmapped gpu_image's: gpu_images[array_index][level_index]
bool create_ktx_texture_file(uint8_vec &ktx_data, const basisu::vector<gpu_image_vec>& gpu_images, bool cubemap_flag, bool astc_srgb_flag)
{
if (!gpu_images.size())
{
assert(0);
return false;
}
uint32_t width = 0, height = 0, total_levels = 0;
basisu::texture_format fmt = texture_format::cInvalidTextureFormat;
// Sanity check the input
if (cubemap_flag)
{
if ((gpu_images.size() % 6) != 0)
{
assert(0);
return false;
}
}
for (uint32_t array_index = 0; array_index < gpu_images.size(); array_index++)
{
const gpu_image_vec &levels = gpu_images[array_index];
if (!levels.size())
{
// Empty mip chain
assert(0);
return false;
}
if (!array_index)
{
width = levels[0].get_pixel_width();
height = levels[0].get_pixel_height();
total_levels = (uint32_t)levels.size();
fmt = levels[0].get_format();
}
else
{
if ((width != levels[0].get_pixel_width()) ||
(height != levels[0].get_pixel_height()) ||
(total_levels != levels.size()))
{
// All cubemap/texture array faces must be the same dimension
assert(0);
return false;
}
}
for (uint32_t level_index = 0; level_index < levels.size(); level_index++)
{
if (level_index)
{
if ( (levels[level_index].get_pixel_width() != maximum<uint32_t>(1, levels[0].get_pixel_width() >> level_index)) ||
(levels[level_index].get_pixel_height() != maximum<uint32_t>(1, levels[0].get_pixel_height() >> level_index)) )
{
// Malformed mipmap chain
assert(0);
return false;
}
}
if (fmt != levels[level_index].get_format())
{
// All input textures must use the same GPU format
assert(0);
return false;
}
}
}
uint32_t internal_fmt = KTX_ETC1_RGB8_OES, base_internal_fmt = KTX_RGB;
switch (fmt)
{
case texture_format::cBC1:
case texture_format::cBC1_NV:
case texture_format::cBC1_AMD:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGB_S3TC_DXT1_EXT : KTX_COMPRESSED_SRGB_S3TC_DXT1_EXT;
break;
}
case texture_format::cBC3:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_S3TC_DXT5_EXT : KTX_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cBC4:
{
internal_fmt = KTX_COMPRESSED_RED_RGTC1_EXT;// KTX_COMPRESSED_LUMINANCE_LATC1_EXT;
base_internal_fmt = KTX_RED;
break;
}
case texture_format::cBC5:
{
internal_fmt = KTX_COMPRESSED_RED_GREEN_RGTC2_EXT;
base_internal_fmt = KTX_RG;
break;
}
case texture_format::cETC1:
case texture_format::cETC1S:
{
// ETC1 has no sRGB GL enum; it is always written as linear ETC1, never
// relabeled as ETC2.
internal_fmt = KTX_ETC1_RGB8_OES;
break;
}
case texture_format::cETC2_RGB:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGB8_ETC2 : KTX_COMPRESSED_SRGB8_ETC2;
break;
}
case texture_format::cETC2_RGBA:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA8_ETC2_EAC : KTX_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cBC6HSigned:
{
internal_fmt = KTX_COMPRESSED_RGB_BPTC_SIGNED_FLOAT;
base_internal_fmt = KTX_RGB;
break;
}
case texture_format::cBC6HUnsigned:
{
internal_fmt = KTX_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT;
base_internal_fmt = KTX_RGB;
break;
}
case texture_format::cBC7:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_BPTC_UNORM : KTX_COMPRESSED_SRGB_ALPHA_BPTC_UNORM;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cPVRTC1_4_RGB:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGB_PVRTC_4BPPV1_IMG : KTX_COMPRESSED_SRGB_PVRTC_4BPPV1_EXT;
break;
}
case texture_format::cPVRTC1_4_RGBA:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG : KTX_COMPRESSED_SRGB_ALPHA_PVRTC_4BPPV1_EXT;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_HDR_6x6:
{
internal_fmt = KTX_COMPRESSED_RGBA_ASTC_6x6_KHR;
// RGBA is correct: ASTC HDR can have alpha, and the RGBA ASTC token's base format is RGBA.
base_internal_fmt = KTX_RGBA;
break;
}
// We use different enums for HDR vs. LDR ASTC, but internally they are both just ASTC.
case texture_format::cASTC_HDR_4x4:
case texture_format::cUASTC_HDR_4x4: // UASTC_HDR 4x4 is just HDR-only ASTC
{
internal_fmt = KTX_COMPRESSED_RGBA_ASTC_4x4_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_4x4:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_4x4_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_5x4:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_5x4_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_5x5:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_5x5_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_6x5:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_6x5_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_6x6:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_6x6_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_8x5:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_8x5_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_8x6:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_8x6_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_10x5:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_10x5_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_10x6:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_10x6_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_8x8:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_8x8_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_10x8:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_10x8_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_10x10:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_10x10_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_12x10:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_12x10_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cASTC_LDR_12x12:
{
internal_fmt = !astc_srgb_flag ? KTX_COMPRESSED_RGBA_ASTC_12x12_KHR : KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cATC_RGB:
{
internal_fmt = KTX_ATC_RGB_AMD;
break;
}
case texture_format::cATC_RGBA_INTERPOLATED_ALPHA:
{
internal_fmt = KTX_ATC_RGBA_INTERPOLATED_ALPHA_AMD;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cETC2_R11_EAC:
{
internal_fmt = KTX_COMPRESSED_R11_EAC;
base_internal_fmt = KTX_RED;
break;
}
case texture_format::cETC2_RG11_EAC:
{
internal_fmt = KTX_COMPRESSED_RG11_EAC;
base_internal_fmt = KTX_RG;
break;
}
case texture_format::cUASTC4x4:
{
internal_fmt = KTX_COMPRESSED_RGBA_UASTC_4x4_KHR;
base_internal_fmt = KTX_RGBA;
break;
}
case texture_format::cFXT1_RGB:
{
internal_fmt = KTX_COMPRESSED_RGB_FXT1_3DFX;
break;
}
case texture_format::cPVRTC2_4_RGBA:
{
internal_fmt = KTX_COMPRESSED_RGBA_PVRTC_4BPPV2_IMG;
base_internal_fmt = KTX_RGBA;
break;
}
default:
{
// TODO
assert(0);
return false;
}
}
ktx_header header;
header.clear();
memcpy(&header.m_identifier, g_ktx_file_id, sizeof(g_ktx_file_id));
header.m_endianness = KTX_ENDIAN;
header.m_pixelWidth = width;
header.m_pixelHeight = height;
header.m_glTypeSize = 1;
header.m_glInternalFormat = internal_fmt;
header.m_glBaseInternalFormat = base_internal_fmt;
header.m_numberOfArrayElements = (uint32_t)(cubemap_flag ? (gpu_images.size() / 6) : gpu_images.size());
if (header.m_numberOfArrayElements == 1)
header.m_numberOfArrayElements = 0;
header.m_numberOfMipmapLevels = total_levels;
header.m_numberOfFaces = cubemap_flag ? 6 : 1;
append_vector(ktx_data, (uint8_t*)&header, sizeof(header));
fmt_debug_printf("create_ktx_texture_file: {}x{}, astc_srgb_flag: {}, basis::texture_format: {}, internalFormat: {}, baseInternalFormat: {}, arrayElements: {}, faces: {}, mipLevels: {}\n",
width, height, astc_srgb_flag, (uint32_t)fmt,
(uint32_t)header.m_glInternalFormat, (uint32_t)header.m_glBaseInternalFormat,
(uint32_t)header.m_numberOfArrayElements, (uint32_t)header.m_numberOfFaces,
(uint32_t)header.m_numberOfMipmapLevels);
for (uint32_t level_index = 0; level_index < total_levels; level_index++)
{
uint32_t img_size = gpu_images[0][level_index].get_size_in_bytes();
if ((header.m_numberOfFaces == 1) || (header.m_numberOfArrayElements > 1))
{
img_size = img_size * header.m_numberOfFaces * maximum<uint32_t>(1, header.m_numberOfArrayElements);
}
assert(img_size && ((img_size & 3) == 0));
packed_uint<4> packed_img_size(img_size);
append_vector(ktx_data, (uint8_t*)&packed_img_size, sizeof(packed_img_size));
uint32_t bytes_written = 0;
(void)bytes_written;
for (uint32_t array_index = 0; array_index < maximum<uint32_t>(1, header.m_numberOfArrayElements); array_index++)
{
for (uint32_t face_index = 0; face_index < header.m_numberOfFaces; face_index++)
{
const gpu_image& img = gpu_images[cubemap_flag ? (array_index * 6 + face_index) : array_index][level_index];
append_vector(ktx_data, (uint8_t*)img.get_ptr(), img.get_size_in_bytes());
bytes_written += img.get_size_in_bytes();
}
} // array_index
} // level_index
return true;
}
bool does_dds_support_format(texture_format fmt)
{
switch (fmt)
{
case texture_format::cBC1_NV:
case texture_format::cBC1_AMD:
case texture_format::cBC1:
case texture_format::cBC3:
case texture_format::cBC4:
case texture_format::cBC5:
case texture_format::cBC6HSigned:
case texture_format::cBC6HUnsigned:
case texture_format::cBC7:
return true;
default:
break;
}
return false;
}
// Only supports the basic DirectX BC texture formats.
// gpu_images array is: [face/layer][mipmap level]
// For cubemap arrays, # of face/layers must be a multiple of 6.
// Accepts 2D, 2D mipmapped, 2D array, 2D array mipmapped
// and cubemap, cubemap mipmapped, and cubemap array mipmapped.
bool write_dds_file(uint8_vec &dds_data, const basisu::vector<gpu_image_vec>& gpu_images, bool cubemap_flag, bool use_srgb_format)
{
if (!gpu_images.size())
{
assert(0);
return false;
}
// Sanity check the input
uint32_t slices = 1;
if (cubemap_flag)
{
if ((gpu_images.size() % 6) != 0)
{
assert(0);
return false;
}
slices = gpu_images.size_u32() / 6;
}
else
{
slices = gpu_images.size_u32();
}
uint32_t width = 0, height = 0, total_levels = 0;
basisu::texture_format fmt = texture_format::cInvalidTextureFormat;
// Sanity check the input for consistent # of dimensions and mip levels
for (uint32_t array_index = 0; array_index < gpu_images.size(); array_index++)
{
const gpu_image_vec& levels = gpu_images[array_index];
if (!levels.size())
{
// Empty mip chain
assert(0);
return false;
}
if (!array_index)
{
width = levels[0].get_pixel_width();
height = levels[0].get_pixel_height();
total_levels = (uint32_t)levels.size();
fmt = levels[0].get_format();
}
else
{
if ((width != levels[0].get_pixel_width()) ||
(height != levels[0].get_pixel_height()) ||
(total_levels != levels.size()))
{
// All cubemap/texture array faces must be the same dimension
assert(0);
return false;
}
}
for (uint32_t level_index = 0; level_index < levels.size(); level_index++)
{
if (level_index)
{
if ((levels[level_index].get_pixel_width() != maximum<uint32_t>(1, levels[0].get_pixel_width() >> level_index)) ||
(levels[level_index].get_pixel_height() != maximum<uint32_t>(1, levels[0].get_pixel_height() >> level_index)))
{
// Malformed mipmap chain
assert(0);
return false;
}
}
if (fmt != levels[level_index].get_format())
{
// All input textures must use the same GPU format
assert(0);
return false;
}
}
}
// No mipmap levels
if (!total_levels)
{
assert(0);
return false;
}
// Create the DDS mipmap level data
uint8_vec mipmaps[32];
// See https://learn.microsoft.com/en-us/windows/win32/direct3ddds/dds-file-layout-for-cubic-environment-maps
// DDS cubemap organization is cubemap face 0 followed by all mips, then cubemap face 1 followed by all mips, etc.
// Unfortunately tinydds.h's writer doesn't handle this case correctly, so we work around it here.
// This also applies with 2D texture arrays, too. RenderDoc and ddsview (DirectXTex) views each type (cubemap array and 2D texture array) correctly.
// Also see "Using Texture Arrays in Direct3D 10/11":
// https://learn.microsoft.com/en-us/windows/win32/direct3ddds/dx-graphics-dds-pguide
for (uint32_t array_index = 0; array_index < gpu_images.size(); array_index++)
{
const gpu_image_vec& levels = gpu_images[array_index];
for (uint32_t level_index = 0; level_index < levels.size(); level_index++)
{
append_vector(mipmaps[0], (uint8_t*)levels[level_index].get_ptr(), levels[level_index].get_size_in_bytes());
} // level_index
} // array_index
#if 0
// This organization, required by tinydds.h's API, is wrong.
{
for (uint32_t array_index = 0; array_index < gpu_images.size(); array_index++)
{
const gpu_image_vec& levels = gpu_images[array_index];
for (uint32_t level_index = 0; level_index < levels.size(); level_index++)
{
append_vector(mipmaps[level_index], (uint8_t*)levels[level_index].get_ptr(), levels[level_index].get_size_in_bytes());
} // level_index
} // array_index
}
#endif
// Write DDS file using tinydds
TinyDDS_WriteCallbacks cbs;
cbs.error = [](void* user, char const* msg) { BASISU_NOTE_UNUSED(user); fprintf(stderr, "tinydds: %s\n", msg); };
cbs.alloc = [](void* user, size_t size) -> void* { BASISU_NOTE_UNUSED(user); return malloc(size); };
cbs.free = [](void* user, void* memory) { BASISU_NOTE_UNUSED(user); free(memory); };
cbs.write = [](void* user, void const* buffer, size_t byteCount) { BASISU_NOTE_UNUSED(user); uint8_vec* pVec = (uint8_vec*)user; append_vector(*pVec, (const uint8_t*)buffer, byteCount); };
uint32_t mipmap_sizes[32];
const void* mipmap_ptrs[32];
clear_obj(mipmap_sizes);
clear_obj(mipmap_ptrs);
assert(total_levels < 32);
for (uint32_t i = 0; i < total_levels; i++)
{
mipmap_sizes[i] = mipmaps[i].size_in_bytes_u32();
mipmap_ptrs[i] = mipmaps[i].get_ptr();
}
// Select tinydds texture format
uint32_t tinydds_fmt = 0;
switch (fmt)
{
case texture_format::cBC1_NV:
case texture_format::cBC1_AMD:
case texture_format::cBC1:
tinydds_fmt = use_srgb_format ? TDDS_BC1_RGBA_SRGB_BLOCK : TDDS_BC1_RGBA_UNORM_BLOCK;
break;
case texture_format::cBC3:
tinydds_fmt = use_srgb_format ? TDDS_BC3_SRGB_BLOCK : TDDS_BC3_UNORM_BLOCK;
break;
case texture_format::cBC4:
tinydds_fmt = TDDS_BC4_UNORM_BLOCK;
break;
case texture_format::cBC5:
tinydds_fmt = TDDS_BC5_UNORM_BLOCK;
break;
case texture_format::cBC6HSigned:
tinydds_fmt = TDDS_BC6H_SFLOAT_BLOCK;
break;
case texture_format::cBC6HUnsigned:
tinydds_fmt = TDDS_BC6H_UFLOAT_BLOCK;
break;
case texture_format::cBC7:
tinydds_fmt = use_srgb_format ? TDDS_BC7_SRGB_BLOCK : TDDS_BC7_UNORM_BLOCK;
break;
default:
{
fprintf(stderr, "Warning: Unsupported format in write_dds_file().\n");
return false;
}
}
// Note DirectXTex's DDSView doesn't handle odd sizes textures correctly. RenderDoc loads them fine, however.
fmt_debug_printf("write_dds_file: {}x{}, basis::texture_format: {}, tinydds_fmt: {}, slices: {}, mipLevels: {}, cubemap_flag: {}, use_srgb_format: {}\n",
width, height, (uint32_t)fmt, tinydds_fmt, slices, total_levels, cubemap_flag, use_srgb_format);
bool status = TinyDDS_WriteImage(&cbs,
&dds_data,
width,
height,
1,
slices,
total_levels,
(TinyDDS_Format)tinydds_fmt,
cubemap_flag,
true,
mipmap_sizes,
mipmap_ptrs);
if (!status)
{
fprintf(stderr, "write_dds_file: Failed creating DDS file\n");
return false;
}
return true;
}
bool write_dds_file(const char* pFilename, const basisu::vector<gpu_image_vec>& gpu_images, bool cubemap_flag, bool use_srgb_format)
{
uint8_vec dds_data;
if (!write_dds_file(dds_data, gpu_images, cubemap_flag, use_srgb_format))
return false;
if (!write_vec_to_file(pFilename, dds_data))
{
fprintf(stderr, "write_dds_file: Failed writing DDS file data\n");
return false;
}
return true;
}
static uint32_t mipmap_reduce(uint32_t value, uint32_t level)
{
for (uint32_t i = 0; i < level; i++)
{
if (value <= 1u)
return 1;
value = value >> 1u;
}
return value;
}
bool read_uncompressed_dds_file(const char* pFilename, basisu::vector<image> &ldr_mips, basisu::vector<imagef>& hdr_mips)
{
const uint32_t MAX_IMAGE_DIM = 16384;
TinyDDS_Callbacks cbs;
cbs.errorFn = [](void* user, char const* msg) { BASISU_NOTE_UNUSED(user); fprintf(stderr, "tinydds: %s\n", msg); };
cbs.allocFn = [](void* user, size_t size) -> void* { BASISU_NOTE_UNUSED(user); return malloc(size); };
cbs.freeFn = [](void* user, void* memory) { BASISU_NOTE_UNUSED(user); free(memory); };
cbs.readFn = [](void* user, void* buffer, size_t byteCount) -> size_t { return (size_t)fread(buffer, 1, byteCount, (FILE*)user); };
#ifdef _MSC_VER
cbs.seekFn = [](void* user, int64_t ofs) -> bool { return _fseeki64((FILE*)user, ofs, SEEK_SET) == 0; };
cbs.tellFn = [](void* user) -> int64_t { return _ftelli64((FILE*)user); };
#else
cbs.seekFn = [](void* user, int64_t ofs) -> bool { return fseek((FILE*)user, (long)ofs, SEEK_SET) == 0; };
cbs.tellFn = [](void* user) -> int64_t { return (int64_t)ftell((FILE*)user); };
#endif
FILE* pFile = fopen_safe(pFilename, "rb");
if (!pFile)
{
error_printf("Can't open .DDS file \"%s\"\n", pFilename);
return false;
}
// These are the formats AMD Compressonator supports in its UI.
enum dds_fmt
{
cRGBA32,
cRGBA_HALF,
cRGBA_FLOAT
};
bool status = false;
dds_fmt fmt = cRGBA32;
uint32_t width = 0, height = 0;
bool hdr_flag = false;
TinyDDS_Format tfmt = TDDS_UNDEFINED;
TinyDDS_ContextHandle ctx = TinyDDS_CreateContext(&cbs, pFile);
if (!ctx)
goto failure;
status = TinyDDS_ReadHeader(ctx);
if (!status)
{
error_printf("Failed parsing DDS header in file \"%s\"\n", pFilename);
goto failure;
}
if ((!TinyDDS_Is2D(ctx)) || (TinyDDS_ArraySlices(ctx) > 1) || (TinyDDS_IsCubemap(ctx)))
{
error_printf("Unsupported DDS texture type in file \"%s\"\n", pFilename);
goto failure;
}
width = TinyDDS_Width(ctx);
height = TinyDDS_Height(ctx);
if (!width || !height)
{
error_printf("DDS texture dimensions invalid in file \"%s\"\n", pFilename);
goto failure;
}
if ((width > MAX_IMAGE_DIM) || (height > MAX_IMAGE_DIM))
{
error_printf("DDS texture dimensions too large in file \"%s\"\n", pFilename);
goto failure;
}
tfmt = TinyDDS_GetFormat(ctx);
switch (tfmt)
{
case TDDS_R8G8B8A8_SRGB:
case TDDS_R8G8B8A8_UNORM:
case TDDS_B8G8R8A8_SRGB:
case TDDS_B8G8R8A8_UNORM:
fmt = cRGBA32;
break;
case TDDS_R16G16B16A16_SFLOAT:
fmt = cRGBA_HALF;
hdr_flag = true;
break;
case TDDS_R32G32B32A32_SFLOAT:
fmt = cRGBA_FLOAT;
hdr_flag = true;
break;
default:
error_printf("File \"%s\" has an unsupported DDS texture format (only supports RGBA/BGRA 32bpp, RGBA HALF float, or RGBA FLOAT)\n", pFilename);
goto failure;
}
if (hdr_flag)
hdr_mips.resize(TinyDDS_NumberOfMipmaps(ctx));
else
ldr_mips.resize(TinyDDS_NumberOfMipmaps(ctx));
for (uint32_t level = 0; level < TinyDDS_NumberOfMipmaps(ctx); level++)
{
const uint32_t level_width = mipmap_reduce(width, level);
const uint32_t level_height = mipmap_reduce(height, level);
const uint32_t total_level_texels = level_width * level_height;
const void* pImage = TinyDDS_ImageRawData(ctx, level);
const uint32_t image_size = TinyDDS_ImageSize(ctx, level);
if (fmt == cRGBA32)
{
ldr_mips[level].resize(level_width, level_height);
if ((ldr_mips[level].get_total_pixels() * sizeof(uint32_t) != image_size))
{
assert(0);
goto failure;
}
memcpy(ldr_mips[level].get_ptr(), pImage, image_size);
if ((tfmt == TDDS_B8G8R8A8_SRGB) || (tfmt == TDDS_B8G8R8A8_UNORM))
{
// Swap R and B components.
uint32_t *pTexels = (uint32_t *)ldr_mips[level].get_ptr();
for (uint32_t i = 0; i < total_level_texels; i++)
{
const uint32_t v = pTexels[i];
const uint32_t r = (v >> 16) & 0xFF;
const uint32_t b = v & 0xFF;
pTexels[i] = r | (b << 16) | (v & 0xFF00FF00);
}
}
}
else if (fmt == cRGBA_FLOAT)
{
hdr_mips[level].resize(level_width, level_height);
if ((hdr_mips[level].get_total_pixels() * sizeof(float) * 4 != image_size))
{
assert(0);
goto failure;
}
memcpy((void *)hdr_mips[level].get_ptr(), pImage, image_size);
}
else if (fmt == cRGBA_HALF)
{
hdr_mips[level].resize(level_width, level_height);
if ((hdr_mips[level].get_total_pixels() * sizeof(basist::half_float) * 4 != image_size))
{
assert(0);
goto failure;
}
// Unpack half to float.
const basist::half_float* pSrc_comps = static_cast<const basist::half_float*>(pImage);
vec4F* pDst_texels = hdr_mips[level].get_ptr();
for (uint32_t i = 0; i < total_level_texels; i++)
{
(*pDst_texels)[0] = basist::half_to_float(pSrc_comps[0]);
(*pDst_texels)[1] = basist::half_to_float(pSrc_comps[1]);
(*pDst_texels)[2] = basist::half_to_float(pSrc_comps[2]);
(*pDst_texels)[3] = basist::half_to_float(pSrc_comps[3]);
pSrc_comps += 4;
pDst_texels++;
} // y
}
} // level
TinyDDS_DestroyContext(ctx);
fclose(pFile);
return true;
failure:
if (ctx)
TinyDDS_DestroyContext(ctx);
if (pFile)
fclose(pFile);
return false;
}
bool write_compressed_texture_file(const char* pFilename, const basisu::vector<gpu_image_vec>& g, bool cubemap_flag, bool use_srgb_format)
{
std::string extension(string_tolower(string_get_extension(pFilename)));
uint8_vec filedata;
if (extension == "ktx")
{
if (!create_ktx_texture_file(filedata, g, cubemap_flag, use_srgb_format))
return false;
}
else if (extension == "pvr")
{
// TODO
return false;
}
else if (extension == "dds")
{
if (!write_dds_file(filedata, g, cubemap_flag, use_srgb_format))
return false;
}
else
{
// unsupported texture format
assert(0);
return false;
}
return basisu::write_vec_to_file(pFilename, filedata);
}
bool write_compressed_texture_file(const char* pFilename, const gpu_image_vec& g, bool use_srgb_format)
{
basisu::vector<gpu_image_vec> a;
a.push_back(g);
return write_compressed_texture_file(pFilename, a, false, use_srgb_format);
}
bool write_compressed_texture_file(const char* pFilename, const gpu_image& g, bool use_srgb_format)
{
basisu::vector<gpu_image_vec> v;
enlarge_vector(v, 1)->push_back(g);
return write_compressed_texture_file(pFilename, v, false, use_srgb_format);
}
//const uint32_t OUT_FILE_MAGIC = 'TEXC';
struct out_file_header
{
packed_uint<4> m_magic;
packed_uint<4> m_pad;
packed_uint<4> m_width;
packed_uint<4> m_height;
};
// As no modern tool supports FXT1 format .KTX files, let's write .OUT files and make sure 3DFX's original tools shipped in 1999 can decode our encoded output.
bool write_3dfx_out_file(const char* pFilename, const gpu_image& gi)
{
out_file_header hdr;
//hdr.m_magic = OUT_FILE_MAGIC;
hdr.m_magic.m_bytes[0] = 67;
hdr.m_magic.m_bytes[1] = 88;
hdr.m_magic.m_bytes[2] = 69;
hdr.m_magic.m_bytes[3] = 84;
hdr.m_pad = 0;
hdr.m_width = gi.get_blocks_x() * 8;
hdr.m_height = gi.get_blocks_y() * 4;
FILE* pFile = nullptr;
#ifdef _WIN32
fopen_s(&pFile, pFilename, "wb");
#else
pFile = fopen(pFilename, "wb");
#endif
if (!pFile)
return false;
fwrite(&hdr, sizeof(hdr), 1, pFile);
fwrite(gi.get_ptr(), gi.get_size_in_bytes(), 1, pFile);
return fclose(pFile) != EOF;
}
#pragma pack(push, 1)
struct astc_file_header
{
uint8_t m_sig[4];
uint8_t m_block_dim[3];
uint8_t m_width[3];
uint8_t m_height[3];
uint8_t m_depth[3];
};
#pragma pack(pop)
bool read_astc_file(const uint8_t *pImage_data, size_t image_data_size, vector2D<astc_helpers::astc_block>& blocks, uint32_t &block_width, uint32_t &block_height, uint32_t &width, uint32_t &height)
{
block_width = 0;
block_height = 0;
width = 0;
height = 0;
blocks.resize(0, 0);
if (image_data_size < (sizeof(astc_file_header) + sizeof(astc_helpers::astc_block)))
return false;
const astc_file_header* pHeader = reinterpret_cast<const astc_file_header*>(pImage_data);
if ((pHeader->m_sig[0] != 0x13) || (pHeader->m_sig[1] != 0xAB) || (pHeader->m_sig[2] != 0xA1) || (pHeader->m_sig[3] != 0x5C))
return false;
const uint32_t block_depth = pHeader->m_block_dim[2];
if (block_depth != 1)
return false;
if ((pHeader->m_depth[0] != 1) || (pHeader->m_depth[1] != 0) || (pHeader->m_depth[2] != 0))
return false;
block_width = pHeader->m_block_dim[0];
block_height = pHeader->m_block_dim[1];
if (!astc_helpers::is_valid_block_size(block_width, block_height))
return false;
width = pHeader->m_width[0] | ((uint32_t)pHeader->m_width[1] << 8u) | ((uint32_t)pHeader->m_width[2] << 16u);
height = pHeader->m_height[0] | ((uint32_t)pHeader->m_height[1] << 8u) | ((uint32_t)pHeader->m_height[2] << 16u);
const uint32_t MAX_DIM = 32768;
if ((!width) || (width > MAX_DIM) || (!height) || (height > MAX_DIM))
return false;
const uint32_t num_blocks_x = (width + block_width - 1) / block_width;
const uint32_t num_blocks_y = (height + block_height - 1) / block_height;
const uint32_t total_blocks = num_blocks_x * num_blocks_y;
size_t total_expected_size = sizeof(astc_file_header) + (size_t)total_blocks * sizeof(astc_helpers::astc_block);
if (image_data_size < total_expected_size)
return false;
if (!blocks.try_resize(num_blocks_x, num_blocks_y))
return false;
memcpy(blocks.get_ptr(), pImage_data + sizeof(astc_file_header), (size_t)total_blocks * sizeof(astc_helpers::astc_block));
return true;
}
bool read_astc_file(const char* pFilename, vector2D<astc_helpers::astc_block>& blocks, uint32_t& block_width, uint32_t& block_height, uint32_t& width, uint32_t& height)
{
uint8_vec file_data;
if (!read_file_to_vec(pFilename, file_data))
return false;
if (!file_data.size())
return false;
return read_astc_file(file_data.get_ptr(), file_data.size(), blocks, block_width, block_height, width, height);
}
// The .astc texture format is readable using ARM's astcenc, AMD Compressonator, and other engines/tools. It oddly doesn't support mipmaps, limiting
// its usefulness/relevance.
// https://github.com/ARM-software/astc-encoder/blob/main/Docs/FileFormat.md
bool write_astc_file(const char* pFilename, const void* pBlocks, uint32_t block_width, uint32_t block_height, uint32_t dim_x, uint32_t dim_y)
{
assert(pBlocks && (dim_x > 0) && (dim_y > 0));
assert(astc_helpers::is_valid_block_size(block_width, block_height));
uint8_vec file_data;
file_data.push_back(0x13);
file_data.push_back(0xAB);
file_data.push_back(0xA1);
file_data.push_back(0x5C);
file_data.push_back((uint8_t)block_width);
file_data.push_back((uint8_t)block_height);
file_data.push_back(1);
file_data.push_back((uint8_t)dim_x);
file_data.push_back((uint8_t)(dim_x >> 8));
file_data.push_back((uint8_t)(dim_x >> 16));
file_data.push_back((uint8_t)dim_y);
file_data.push_back((uint8_t)(dim_y >> 8));
file_data.push_back((uint8_t)(dim_y >> 16));
file_data.push_back((uint8_t)1);
file_data.push_back((uint8_t)0);
file_data.push_back((uint8_t)0);
const uint32_t num_blocks_x = (dim_x + block_width - 1) / block_width;
const uint32_t num_blocks_y = (dim_y + block_height - 1) / block_height;
const uint32_t total_bytes = num_blocks_x * num_blocks_y * 16;
const size_t cur_size = file_data.size();
file_data.resize(cur_size + total_bytes);
memcpy(&file_data[cur_size], pBlocks, total_bytes);
return write_vec_to_file(pFilename, file_data);
}
bool write_uncompressed_rgba32_dds(uint8_vec& dds_data, const basisu::vector<image_vec>& images, bool cubemap_flag, bool use_srgb_format)
{
dds_data.resize(0);
if (!images.size())
{
assert(0);
return false;
}
// Determine the number of array slices (cubemap arrays pack 6 faces per slice).
uint32_t slices = 1;
if (cubemap_flag)
{
if ((images.size() % 6) != 0)
{
fprintf(stderr, "write_uncompressed_rgba32_dds: cubemap face count (%u) must be a multiple of 6\n", images.size_u32());
return false;
}
slices = images.size_u32() / 6;
}
else
{
slices = images.size_u32();
}
// Validate consistent dimensions and a well-formed mip chain across all slices.
uint32_t width = 0, height = 0, total_levels = 0;
for (uint32_t slice_index = 0; slice_index < images.size(); slice_index++)
{
const image_vec& levels = images[slice_index];
if (!levels.size())
{
fprintf(stderr, "write_uncompressed_rgba32_dds: slice %u has an empty mip chain\n", slice_index);
return false;
}
if (!slice_index)
{
width = levels[0].get_width();
height = levels[0].get_height();
total_levels = levels.size_u32();
if (!width || !height)
{
fprintf(stderr, "write_uncompressed_rgba32_dds: zero-sized base image\n");
return false;
}
}
else if ((width != levels[0].get_width()) || (height != levels[0].get_height()) || (total_levels != levels.size()))
{
fprintf(stderr, "write_uncompressed_rgba32_dds: all slices must share the same dimensions and mip count\n");
return false;
}
for (uint32_t level_index = 0; level_index < levels.size(); level_index++)
{
const uint32_t expected_w = maximum<uint32_t>(1, width >> level_index);
const uint32_t expected_h = maximum<uint32_t>(1, height >> level_index);
if ((levels[level_index].get_width() != expected_w) || (levels[level_index].get_height() != expected_h))
{
fprintf(stderr, "write_uncompressed_rgba32_dds: malformed mip chain at slice %u, level %u\n", slice_index, level_index);
return false;
}
}
}
if ((!total_levels) || (total_levels >= 32))
{
fprintf(stderr, "write_uncompressed_rgba32_dds: invalid mip level count (%u)\n", total_levels);
return false;
}
// Concatenate every (slice, level) image into a single contiguous, tightly
// packed buffer in face-then-mip order, and hand it to tinydds as "level 0".
// This mirrors the workaround in write_dds_file(): tinydds.h's writer doesn't
// lay out the per-level array/cubemap data correctly when given separate mip
// pointers, but the resulting on-disk DDS byte order is identical to this.
uint8_vec mipmaps[32];
for (uint32_t slice_index = 0; slice_index < images.size(); slice_index++)
{
const image_vec& levels = images[slice_index];
for (uint32_t level_index = 0; level_index < levels.size(); level_index++)
{
const image& img = levels[level_index];
const uint32_t w = img.get_width(), h = img.get_height();
// Copy row by row to honor the image's pitch, emitting tight w*4-byte rows.
for (uint32_t y = 0; y < h; y++)
append_vector(mipmaps[0], (const uint8_t*)(img.get_ptr() + (size_t)y * img.get_pitch()), w * sizeof(color_rgba));
}
}
// Write the DDS using tinydds (same invocation pattern as write_dds_file()).
TinyDDS_WriteCallbacks cbs;
cbs.error = [](void* user, char const* msg) { BASISU_NOTE_UNUSED(user); fprintf(stderr, "tinydds: %s\n", msg); };
cbs.alloc = [](void* user, size_t size) -> void* { BASISU_NOTE_UNUSED(user); return malloc(size); };
cbs.free = [](void* user, void* memory) { BASISU_NOTE_UNUSED(user); free(memory); };
cbs.write = [](void* user, void const* buffer, size_t byteCount) { BASISU_NOTE_UNUSED(user); uint8_vec* pVec = (uint8_vec*)user; append_vector(*pVec, (const uint8_t*)buffer, byteCount); };
uint32_t mipmap_sizes[32];
const void* mipmap_ptrs[32];
clear_obj(mipmap_sizes);
clear_obj(mipmap_ptrs);
for (uint32_t i = 0; i < total_levels; i++)
{
mipmap_sizes[i] = mipmaps[i].size_in_bytes_u32();
mipmap_ptrs[i] = mipmaps[i].get_ptr();
}
const uint32_t tinydds_fmt = use_srgb_format ? TDDS_R8G8B8A8_SRGB : TDDS_R8G8B8A8_UNORM;
fmt_debug_printf("write_uncompressed_rgba32_dds: {}x{}, slices: {}, mipLevels: {}, cubemap_flag: {}, use_srgb_format: {}\n",
width, height, slices, total_levels, cubemap_flag, use_srgb_format);
bool status = TinyDDS_WriteImage(&cbs,
&dds_data,
width,
height,
1,
slices,
total_levels,
(TinyDDS_Format)tinydds_fmt,
cubemap_flag,
true,
mipmap_sizes,
mipmap_ptrs);
if (!status)
{
fprintf(stderr, "write_uncompressed_rgba32_dds: TinyDDS_WriteImage failed\n");
dds_data.resize(0);
return false;
}
return true;
}
// Shared by transcode_ktx2_to_dds()/transcode_ktx2_to_ktx(): transcodes every
// (array layer, cubemap face, mip level) of an already-start_transcoding()'d
// ktx2_transcoder to the block GPU format (fmt, with its basisu::texture_format
// equivalent bfmt) and builds the [slice][mip] gpu_image array the DDS/KTX
// writers consume. Slices are ordered layer-major then cubemap face. Returns
// false on any transcode failure.
static bool transcode_ktx2_to_block_image_slices(basist::ktx2_transcoder& transcoder, basist::transcoder_texture_format fmt, texture_format bfmt, basisu::vector<gpu_image_vec>& slices, uint32_t decode_flags)
{
using namespace basist;
const uint32_t levels = transcoder.get_levels();
const uint32_t faces = transcoder.get_faces();
const uint32_t layers = maximum<uint32_t>(1, transcoder.get_layers());
slices.resize(0);
slices.reserve(layers * faces);
for (uint32_t layer = 0; layer < layers; layer++)
{
for (uint32_t face = 0; face < faces; face++)
{
gpu_image_vec mips;
mips.resize(levels);
for (uint32_t level = 0; level < levels; level++)
{
ktx2_image_level_info li;
if (!transcoder.get_image_level_info(li, level, layer, face))
{
error_printf("transcode_ktx2_to_block_image_slices: get_image_level_info(L%u, layer %u, face %u) failed\n", level, layer, face);
return false;
}
gpu_image& gi = mips[level];
gi.init(bfmt, li.m_orig_width, li.m_orig_height);
if (!transcoder.transcode_image_level(level, layer, face, gi.get_ptr(), gi.get_total_blocks(), fmt, decode_flags))
{
error_printf("transcode_ktx2_to_block_image_slices: transcode_image_level(L%u, layer %u, face %u) failed\n", level, layer, face);
return false;
}
}
slices.push_back(mips);
}
}
return true;
}
bool transcode_ktx2_to_dds(basist::ktx2_transcoder& transcoder, basist::transcoder_texture_format fmt, uint8_vec& dds_data, int srgb_mode, uint32_t decode_flags)
{
using namespace basist;
dds_data.resize(0);
// Validate the requested output format: BC1/BC3/BC4/BC5/BC6H/BC7 or RGBA32 only.
const bool is_rgba32 = (fmt == transcoder_texture_format::cTFRGBA32);
const texture_format bfmt = basis_get_basisu_texture_format(fmt);
if ((!is_rgba32) && (!does_dds_support_format(bfmt)))
{
error_printf("transcode_ktx2_to_dds: output format \"%s\" can't be written to DDS (must be BC1/BC3/BC4/BC5/BC6H/BC7 or RGBA32)\n", basis_get_format_name(fmt));
return false;
}
if (!basis_is_format_supported(fmt, transcoder.get_basis_tex_format()))
{
error_printf("transcode_ktx2_to_dds: output format \"%s\" isn't a supported transcode target for this input texture\n", basis_get_format_name(fmt));
return false;
}
if (!transcoder.start_transcoding())
{
error_printf("transcode_ktx2_to_dds: start_transcoding() failed\n");
return false;
}
const uint32_t levels = transcoder.get_levels();
const uint32_t faces = transcoder.get_faces();
const uint32_t layers = maximum<uint32_t>(1, transcoder.get_layers());
const bool cubemap_flag = (faces == 6);
// srgb_mode: -1 = auto (use the KTX2's transfer function), 0 = force linear, 1 = force sRGB.
const bool srgb = (srgb_mode < 0) ? transcoder.is_srgb() : (srgb_mode != 0);
if ((!levels) || (!faces))
{
error_printf("transcode_ktx2_to_dds: degenerate texture (levels=%u, faces=%u)\n", levels, faces);
return false;
}
// Build the slice list ordered layer-major then face -- the layout
// write_dds_file() / write_uncompressed_rgba32_dds() expect for 2D, 2D arrays,
// cubemaps, and cubemap arrays (with or without mips).
if (is_rgba32)
{
basisu::vector<image_vec> slices;
slices.reserve(layers * faces);
for (uint32_t layer = 0; layer < layers; layer++)
{
for (uint32_t face = 0; face < faces; face++)
{
image_vec mips;
mips.resize(levels);
for (uint32_t level = 0; level < levels; level++)
{
ktx2_image_level_info li;
if (!transcoder.get_image_level_info(li, level, layer, face))
{
error_printf("transcode_ktx2_to_dds: get_image_level_info(L%u, layer %u, face %u) failed\n", level, layer, face);
return false;
}
image& img = mips[level];
img.resize(li.m_orig_width, li.m_orig_height);
// Pass the image's pitch explicitly so the result is correct regardless of row padding.
if (!transcoder.transcode_image_level(level, layer, face, img.get_ptr(), img.get_pitch() * img.get_height(), fmt, decode_flags, img.get_pitch(), img.get_height()))
{
error_printf("transcode_ktx2_to_dds: transcode_image_level(L%u, layer %u, face %u) to RGBA32 failed\n", level, layer, face);
return false;
}
}
slices.push_back(mips);
}
}
if (!write_uncompressed_rgba32_dds(dds_data, slices, cubemap_flag, srgb))
{
error_printf("transcode_ktx2_to_dds: write_uncompressed_rgba32_dds() failed\n");
return false;
}
}
else
{
basisu::vector<gpu_image_vec> slices;
if (!transcode_ktx2_to_block_image_slices(transcoder, fmt, bfmt, slices, decode_flags))
return false;
if (!write_dds_file(dds_data, slices, cubemap_flag, srgb))
{
error_printf("transcode_ktx2_to_dds: write_dds_file() failed\n");
return false;
}
}
return true;
}
bool does_ktx_support_format(texture_format fmt)
{
switch (fmt)
{
case texture_format::cBC1:
case texture_format::cBC1_NV:
case texture_format::cBC1_AMD:
case texture_format::cBC3:
case texture_format::cBC4:
case texture_format::cBC5:
case texture_format::cBC6HSigned:
case texture_format::cBC6HUnsigned:
case texture_format::cBC7:
case texture_format::cETC1:
case texture_format::cETC1S:
case texture_format::cETC2_RGB:
case texture_format::cETC2_RGBA:
case texture_format::cETC2_R11_EAC:
case texture_format::cETC2_RG11_EAC:
case texture_format::cPVRTC1_4_RGB:
case texture_format::cPVRTC1_4_RGBA:
case texture_format::cPVRTC2_4_RGBA:
case texture_format::cUASTC4x4:
case texture_format::cASTC_LDR_4x4:
case texture_format::cASTC_LDR_5x4:
case texture_format::cASTC_LDR_5x5:
case texture_format::cASTC_LDR_6x5:
case texture_format::cASTC_LDR_6x6:
case texture_format::cASTC_LDR_8x5:
case texture_format::cASTC_LDR_8x6:
case texture_format::cASTC_LDR_10x5:
case texture_format::cASTC_LDR_10x6:
case texture_format::cASTC_LDR_8x8:
case texture_format::cASTC_LDR_10x8:
case texture_format::cASTC_LDR_10x10:
case texture_format::cASTC_LDR_12x10:
case texture_format::cASTC_LDR_12x12:
case texture_format::cASTC_HDR_4x4:
case texture_format::cUASTC_HDR_4x4:
case texture_format::cASTC_HDR_6x6:
return true;
default:
break;
}
return false;
}
bool transcode_ktx2_to_ktx(basist::ktx2_transcoder& transcoder, basist::transcoder_texture_format fmt, uint8_vec& ktx_data, int srgb_mode, uint32_t decode_flags)
{
using namespace basist;
ktx_data.resize(0);
// Validate: must be a compressed format the KTX1 writer supports. Uncompressed
// (RGBA32/half/float/9e5) is intentionally not supported here yet.
const texture_format bfmt = basis_get_basisu_texture_format(fmt);
if (!does_ktx_support_format(bfmt))
{
error_printf("transcode_ktx2_to_ktx: output format \"%s\" can't be written to a compressed KTX file\n", basis_get_format_name(fmt));
return false;
}
if (!basis_is_format_supported(fmt, transcoder.get_basis_tex_format()))
{
error_printf("transcode_ktx2_to_ktx: output format \"%s\" isn't a supported transcode target for this input texture\n", basis_get_format_name(fmt));
return false;
}
if (!transcoder.start_transcoding())
{
error_printf("transcode_ktx2_to_ktx: start_transcoding() failed\n");
return false;
}
const uint32_t levels = transcoder.get_levels();
const uint32_t faces = transcoder.get_faces();
const bool cubemap_flag = (faces == 6);
// srgb_mode: -1 = auto (KTX2's transfer function), 0 = force linear, 1 = force sRGB.
// Selects the sRGB GL enum variants in create_ktx_texture_file() for the formats
// that have them (BC1/BC3/BC7, ETC2, PVRTC1, ASTC LDR); ignored for formats with
// no sRGB variant (BC4/BC5/BC6H/ETC1/PVRTC2).
const bool srgb = (srgb_mode < 0) ? transcoder.is_srgb() : (srgb_mode != 0);
if ((!levels) || (!faces))
{
error_printf("transcode_ktx2_to_ktx: degenerate texture (levels=%u, faces=%u)\n", levels, faces);
return false;
}
basisu::vector<gpu_image_vec> slices;
if (!transcode_ktx2_to_block_image_slices(transcoder, fmt, bfmt, slices, decode_flags))
return false;
if (!create_ktx_texture_file(ktx_data, slices, cubemap_flag, srgb))
{
error_printf("transcode_ktx2_to_ktx: create_ktx_texture_file() failed\n");
return false;
}
return true;
}
// Returns a friendly name for the common DDS formats we care about (BC1-7 and
// the usual LDR/HDR uncompressed variants); returns nullptr for anything else so
// the caller can fall back to printing the raw hex value. For --tinydds_info.
static const char* tinydds_format_to_string(uint32_t fmt)
{
switch (fmt)
{
case TDDS_BC1_RGBA_UNORM_BLOCK: return "BC1 (UNORM)";
case TDDS_BC1_RGBA_SRGB_BLOCK: return "BC1 (sRGB)";
case TDDS_BC2_UNORM_BLOCK: return "BC2 (UNORM)";
case TDDS_BC2_SRGB_BLOCK: return "BC2 (sRGB)";
case TDDS_BC3_UNORM_BLOCK: return "BC3 (UNORM)";
case TDDS_BC3_SRGB_BLOCK: return "BC3 (sRGB)";
case TDDS_BC4_UNORM_BLOCK: return "BC4 (UNORM)";
case TDDS_BC4_SNORM_BLOCK: return "BC4 (SNORM)";
case TDDS_BC5_UNORM_BLOCK: return "BC5 (UNORM)";
case TDDS_BC5_SNORM_BLOCK: return "BC5 (SNORM)";
case TDDS_BC6H_UFLOAT_BLOCK: return "BC6H (UF16, unsigned half)";
case TDDS_BC6H_SFLOAT_BLOCK: return "BC6H (SF16, signed half)";
case TDDS_BC7_UNORM_BLOCK: return "BC7 (UNORM)";
case TDDS_BC7_SRGB_BLOCK: return "BC7 (sRGB)";
case TDDS_R8G8B8A8_UNORM: return "RGBA32 (R8G8B8A8 UNORM)";
case TDDS_R8G8B8A8_SRGB: return "RGBA32 (R8G8B8A8 sRGB)";
case TDDS_B8G8R8A8_UNORM: return "BGRA32 (B8G8R8A8 UNORM)";
case TDDS_B8G8R8A8_SRGB: return "BGRA32 (B8G8R8A8 sRGB)";
case TDDS_R16G16B16A16_UNORM: return "RGBA64 (R16G16B16A16 UNORM)";
case TDDS_R16G16B16A16_SFLOAT: return "RGBA HALF (R16G16B16A16 float)";
case TDDS_R32G32B32A32_SFLOAT: return "RGBA FLOAT (R32G32B32A32 float)";
case TDDS_R9G9B9E5_UFLOAT: return "RGB9E5 (shared exponent)";
default: return nullptr;
}
}
bool print_dds_info(const char* pFilename)
{
TinyDDS_Callbacks cbs;
cbs.errorFn = [](void* user, char const* msg) { BASISU_NOTE_UNUSED(user); fprintf(stderr, "tinydds: %s\n", msg); };
cbs.allocFn = [](void* user, size_t size) -> void* { BASISU_NOTE_UNUSED(user); return malloc(size); };
cbs.freeFn = [](void* user, void* memory) { BASISU_NOTE_UNUSED(user); free(memory); };
cbs.readFn = [](void* user, void* buffer, size_t byteCount) -> size_t { return (size_t)fread(buffer, 1, byteCount, (FILE*)user); };
#ifdef _MSC_VER
cbs.seekFn = [](void* user, int64_t ofs) -> bool { return _fseeki64((FILE*)user, ofs, SEEK_SET) == 0; };
cbs.tellFn = [](void* user) -> int64_t { return _ftelli64((FILE*)user); };
#else
cbs.seekFn = [](void* user, int64_t ofs) -> bool { return fseek((FILE*)user, (long)ofs, SEEK_SET) == 0; };
cbs.tellFn = [](void* user) -> int64_t { return (int64_t)ftell((FILE*)user); };
#endif
FILE* pFile = fopen_safe(pFilename, "rb");
if (!pFile)
{
error_printf("Can't open .DDS file \"%s\"\n", pFilename);
return false;
}
TinyDDS_ContextHandle ctx = TinyDDS_CreateContext(&cbs, pFile);
if (!ctx)
{
error_printf("Failed creating tinydds context for \"%s\"\n", pFilename);
fclose(pFile);
return false;
}
if (!TinyDDS_ReadHeader(ctx))
{
error_printf("Failed parsing DDS header in file \"%s\"\n", pFilename);
TinyDDS_DestroyContext(ctx);
fclose(pFile);
return false;
}
const uint32_t w = TinyDDS_Width(ctx);
const uint32_t h = TinyDDS_Height(ctx);
const uint32_t depth = TinyDDS_Depth(ctx);
const uint32_t slices = TinyDDS_ArraySlices(ctx);
const uint32_t mips = TinyDDS_NumberOfMipmaps(ctx);
const bool is_cube = TinyDDS_IsCubemap(ctx);
const bool is_array = TinyDDS_IsArray(ctx);
const bool is_3d = TinyDDS_Is3D(ctx);
const bool is_1d = TinyDDS_Is1D(ctx);
const uint32_t fmt = (uint32_t)TinyDDS_GetFormat(ctx);
const char* pType =
is_cube ? ((slices > 1) ? "Cubemap array" : "Cubemap") :
is_3d ? "3D (volume)" :
is_1d ? ((slices > 1) ? "1D array" : "1D") :
((slices > 1) ? "2D array" : "2D");
const char* pFmtStr = tinydds_format_to_string(fmt);
printf("DDS file: %s\n", pFilename);
printf(" Texture type : %s\n", pType);
if (is_3d)
printf(" Dimensions : %ux%ux%u (WxHxDepth)\n", w, h, depth);
else
printf(" Dimensions : %ux%u\n", w, h);
printf(" Mip levels : %u\n", mips);
// tinydds reports 0 array slices for a non-array texture; show 1 for clarity.
const uint32_t num_slices = maximum<uint32_t>(1, slices);
if (is_cube)
printf(" Array slices : %u cube(s) x 6 faces = %u image(s) per mip\n", num_slices, num_slices * 6);
else
printf(" Array slices : %u\n", num_slices);
printf(" Cubemap : %s\n", is_cube ? "yes" : "no");
// "Array" reflects a genuine multi-element array. tinydds's IsArray() is true for ANY DX10 file
// (arraySize>=1), so without care a plain single 2D texture or a single cubemap would falsely read
// "yes". For a cubemap, array-ness means more than one cube (slices > 1). For a 2D texture, annotate
// the DX10 1-element quirk ("yes (1 element)") rather than contradict "Texture type : 2D".
if (is_cube)
printf(" Array : %s\n", (num_slices > 1) ? "yes" : "no");
else if (is_array && (num_slices == 1))
printf(" Array : yes (1 element)\n");
else
printf(" Array : %s\n", is_array ? "yes" : "no");
if (pFmtStr)
printf(" Format : %s [tinydds %u / 0x%X]\n", pFmtStr, fmt, fmt);
else
printf(" Format : 0x%X [tinydds %u]\n", fmt, fmt);
TinyDDS_DestroyContext(ctx);
fclose(pFile);
return true;
}
// Friendly name for the KTX1 glInternalFormat GL enums we care about (the set
// create_ktx_texture_file() writes, plus a few common extras). nullptr otherwise
// so the caller prints the raw hex. For --ktx_info.
static const char* ktx_gl_internal_format_name(uint32_t fmt)
{
switch (fmt)
{
case KTX_RGB: return "RGB (uncompressed)";
case KTX_RGBA: return "RGBA (uncompressed)";
case KTX_RED: return "RED (uncompressed)";
case KTX_RG: return "RG (uncompressed)";
case KTX_ETC1_RGB8_OES: return "ETC1 RGB8";
case KTX_COMPRESSED_RGB_S3TC_DXT1_EXT: return "BC1 (DXT1 RGB)";
case KTX_COMPRESSED_SRGB_S3TC_DXT1_EXT: return "BC1 (DXT1 RGB sRGB)";
case KTX_COMPRESSED_RGBA_S3TC_DXT5_EXT: return "BC3 (DXT5 RGBA)";
case KTX_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT: return "BC3 (DXT5 RGBA sRGB)";
case KTX_COMPRESSED_RED_RGTC1_EXT: return "BC4 (RGTC1 R)";
case KTX_COMPRESSED_RED_GREEN_RGTC2_EXT: return "BC5 (RGTC2 RG)";
case KTX_COMPRESSED_RGB8_ETC2: return "ETC2 RGB8";
case KTX_COMPRESSED_SRGB8_ETC2: return "ETC2 RGB8 sRGB";
case KTX_COMPRESSED_RGBA8_ETC2_EAC: return "ETC2 RGBA8 EAC";
case KTX_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC: return "ETC2 RGBA8 EAC sRGB";
case KTX_COMPRESSED_RGBA_BPTC_UNORM: return "BC7 (BPTC UNORM)";
case KTX_COMPRESSED_SRGB_ALPHA_BPTC_UNORM: return "BC7 (BPTC sRGB)";
case KTX_COMPRESSED_RGB_BPTC_SIGNED_FLOAT: return "BC6H (signed float)";
case KTX_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT: return "BC6H (unsigned float)";
case KTX_COMPRESSED_RGB_PVRTC_4BPPV1_IMG: return "PVRTC1 4bpp RGB";
case KTX_COMPRESSED_SRGB_PVRTC_4BPPV1_EXT: return "PVRTC1 4bpp RGB sRGB";
case KTX_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG: return "PVRTC1 4bpp RGBA";
case KTX_COMPRESSED_SRGB_ALPHA_PVRTC_4BPPV1_EXT: return "PVRTC1 4bpp RGBA sRGB";
case KTX_COMPRESSED_RGBA_PVRTC_4BPPV2_IMG: return "PVRTC2 4bpp RGBA";
case KTX_COMPRESSED_R11_EAC: return "EAC R11";
case KTX_COMPRESSED_RG11_EAC: return "EAC RG11";
case KTX_COMPRESSED_RGBA_UASTC_4x4_KHR: return "UASTC 4x4";
case KTX_ATC_RGB_AMD: return "ATC RGB";
case KTX_ATC_RGBA_INTERPOLATED_ALPHA_AMD: return "ATC RGBA (interpolated alpha)";
case KTX_COMPRESSED_RGB_FXT1_3DFX: return "FXT1 RGB";
case KTX_COMPRESSED_RGBA_FXT1_3DFX: return "FXT1 RGBA";
case KTX_COMPRESSED_RGBA_ASTC_4x4_KHR: return "ASTC 4x4";
case KTX_COMPRESSED_RGBA_ASTC_5x4_KHR: return "ASTC 5x4";
case KTX_COMPRESSED_RGBA_ASTC_5x5_KHR: return "ASTC 5x5";
case KTX_COMPRESSED_RGBA_ASTC_6x5_KHR: return "ASTC 6x5";
case KTX_COMPRESSED_RGBA_ASTC_6x6_KHR: return "ASTC 6x6";
case KTX_COMPRESSED_RGBA_ASTC_8x5_KHR: return "ASTC 8x5";
case KTX_COMPRESSED_RGBA_ASTC_8x6_KHR: return "ASTC 8x6";
case KTX_COMPRESSED_RGBA_ASTC_8x8_KHR: return "ASTC 8x8";
case KTX_COMPRESSED_RGBA_ASTC_10x5_KHR: return "ASTC 10x5";
case KTX_COMPRESSED_RGBA_ASTC_10x6_KHR: return "ASTC 10x6";
case KTX_COMPRESSED_RGBA_ASTC_10x8_KHR: return "ASTC 10x8";
case KTX_COMPRESSED_RGBA_ASTC_10x10_KHR: return "ASTC 10x10";
case KTX_COMPRESSED_RGBA_ASTC_12x10_KHR: return "ASTC 12x10";
case KTX_COMPRESSED_RGBA_ASTC_12x12_KHR: return "ASTC 12x12";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR: return "ASTC 4x4 sRGB";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR: return "ASTC 5x4 sRGB";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR: return "ASTC 5x5 sRGB";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR: return "ASTC 6x5 sRGB";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR: return "ASTC 6x6 sRGB";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR: return "ASTC 8x5 sRGB";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR: return "ASTC 8x6 sRGB";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR: return "ASTC 8x8 sRGB";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR: return "ASTC 10x5 sRGB";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR: return "ASTC 10x6 sRGB";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR: return "ASTC 10x8 sRGB";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR: return "ASTC 10x10 sRGB";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR: return "ASTC 12x10 sRGB";
case KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR: return "ASTC 12x12 sRGB";
default: return nullptr;
}
}
bool print_ktx_info(const char* pFilename)
{
FILE* pFile = fopen_safe(pFilename, "rb");
if (!pFile)
{
error_printf("Can't open .ktx file \"%s\"\n", pFilename);
return false;
}
ktx_header hdr;
hdr.clear();
const size_t n = fread(&hdr, 1, sizeof(hdr), pFile);
fclose(pFile);
if (n != sizeof(hdr))
{
error_printf("Failed reading KTX header from \"%s\" (file too small)\n", pFilename);
return false;
}
if (memcmp(hdr.m_identifier, g_ktx_file_id, sizeof(g_ktx_file_id)) != 0)
{
error_printf("File \"%s\" is not a KTX1 file (bad identifier)\n", pFilename);
return false;
}
// The endianness field is 0x04030201 stored in the file's byte order. If we
// read back KTX_ENDIAN the file matches our (little-endian) byte order; if we
// read KTX_OPPOSITE_ENDIAN every uint32 field must be byte-swapped.
const uint32_t endianness = hdr.m_endianness;
bool swap;
if (endianness == KTX_ENDIAN)
swap = false;
else if (endianness == KTX_OPPOSITE_ENDIAN)
swap = true;
else
{
error_printf("File \"%s\" has an invalid KTX endianness field (0x%08X)\n", pFilename, endianness);
return false;
}
// packed_uint<4> yields a little-endian uint32; swap it for an opposite-endian file.
auto rd = [swap](uint32_t v) -> uint32_t
{
if (!swap)
return v;
return ((v >> 24) & 0xFFu) | ((v >> 8) & 0xFF00u) | ((v << 8) & 0xFF0000u) | ((v << 24) & 0xFF000000u);
};
const uint32_t gl_type = rd(hdr.m_glType);
const uint32_t gl_type_size = rd(hdr.m_glTypeSize);
const uint32_t gl_format = rd(hdr.m_glFormat);
const uint32_t gl_internal_format = rd(hdr.m_glInternalFormat);
const uint32_t gl_base_internal_format = rd(hdr.m_glBaseInternalFormat);
const uint32_t pixel_width = rd(hdr.m_pixelWidth);
const uint32_t pixel_height = rd(hdr.m_pixelHeight);
const uint32_t pixel_depth = rd(hdr.m_pixelDepth);
const uint32_t array_elements = rd(hdr.m_numberOfArrayElements);
const uint32_t faces = rd(hdr.m_numberOfFaces);
const uint32_t mip_levels = rd(hdr.m_numberOfMipmapLevels);
const uint32_t kvd_bytes = rd(hdr.m_bytesOfKeyValueData);
const char* pName = ktx_gl_internal_format_name(gl_internal_format);
printf("KTX1 file: %s\n", pFilename);
printf(" Endianness : 0x%08X (%s)\n", endianness, swap ? "opposite -- byte-swapped" : "native");
printf(" glType : 0x%X (%u)%s\n", gl_type, gl_type, gl_type ? "" : " (0 = compressed)");
printf(" glTypeSize : %u\n", gl_type_size);
printf(" glFormat : 0x%X (%u)%s\n", gl_format, gl_format, gl_format ? "" : " (0 = compressed)");
if (pName)
printf(" glInternalFormat : 0x%X (%u) %s\n", gl_internal_format, gl_internal_format, pName);
else
printf(" glInternalFormat : 0x%X (%u)\n", gl_internal_format, gl_internal_format);
printf(" glBaseInternalFormat : 0x%X (%u)\n", gl_base_internal_format, gl_base_internal_format);
printf(" pixelWidth : %u\n", pixel_width);
printf(" pixelHeight : %u%s\n", pixel_height, pixel_height ? "" : " (1D texture)");
printf(" pixelDepth : %u%s\n", pixel_depth, pixel_depth ? "" : " (non-3D)");
printf(" numberOfArrayElements : %u%s\n", array_elements, array_elements ? "" : " (not an array)");
printf(" numberOfFaces : %u%s\n", faces, (faces == 6) ? " (cubemap)" : "");
printf(" numberOfMipmapLevels : %u\n", mip_levels);
printf(" bytesOfKeyValueData : %u\n", kvd_bytes);
return true;
}
} // basisu
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