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basis_universal/basisu_gpu_texture.cpp

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// basisu_gpu_texture.cpp
// Copyright (C) 2017-2019 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"
namespace basisu
{
const int8_t g_etc2_eac_tables[16][8] =
{
{ -3, -6, -9, -15, 2, 5, 8, 14 }, { -3, -7, -10, -13, 2, 6, 9, 12 }, { -2, -5, -8, -13, 1, 4, 7, 12 }, { -2, -4, -6, -13, 1, 3, 5, 12 },
{ -3, -6, -8, -12, 2, 5, 7, 11 }, { -3, -7, -9, -11, 2, 6, 8, 10 }, { -4, -7, -8, -11, 3, 6, 7, 10 }, { -3, -5, -8, -11, 2, 4, 7, 10 },
{ -2, -6, -8, -10, 1, 5, 7, 9 }, { -2, -5, -8, -10, 1, 4, 7, 9 }, { -2, -4, -8, -10, 1, 3, 7, 9 }, { -2, -5, -7, -10, 1, 4, 6, 9 },
{ -3, -4, -7, -10, 2, 3, 6, 9 }, { -1, -2, -3, -10, 0, 1, 2, 9 }, { -4, -6, -8, -9, 3, 5, 7, 8 }, { -3, -5, -7, -9, 2, 4, 6, 8 }
};
struct eac_a8_block
{
uint16_t m_base : 8;
uint16_t m_table : 4;
uint16_t m_multiplier : 4;
uint8_t m_selectors[6];
inline uint32_t get_selector(uint32_t x, uint32_t y, uint64_t selector_bits) const
{
assert((x < 4) && (y < 4));
return static_cast<uint32_t>((selector_bits >> (45 - (y + x * 4) * 3)) & 7);
}
inline uint64_t get_selector_bits() const
{
uint64_t pixels = ((uint64_t)m_selectors[0] << 40) | ((uint64_t)m_selectors[1] << 32) | ((uint64_t)m_selectors[2] << 24) | ((uint64_t)m_selectors[3] << 16) | ((uint64_t)m_selectors[4] << 8) | m_selectors[5];
return pixels;
}
};
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);
}
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; }
};
// Returns true if the block uses 3 color punchthrough alpha mode.
bool unpack_bc1(const void *pBlock_bits, color_rgba *pPixels, bool set_alpha)
{
static_assert(sizeof(bc1_block) == 8, "sizeof(bc1_block) == 8");
const bc1_block *pBlock = static_cast<const 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;
bc1_block::unpack_color(l, r0, g0, b0);
bc1_block::unpack_color(h, r1, g1, b1);
bool used_punchthrough = false;
if (l > h)
{
c[0].set_noclamp_rgba(r0, g0, b0, 255);
c[1].set_noclamp_rgba(r1, g1, b1, 255);
c[2].set_noclamp_rgba((r0 * 2 + r1) / 3, (g0 * 2 + g1) / 3, (b0 * 2 + b1) / 3, 255);
c[3].set_noclamp_rgba((r1 * 2 + r0) / 3, (g1 * 2 + g0) / 3, (b1 * 2 + b0) / 3, 255);
}
else
{
c[0].set_noclamp_rgba(r0, g0, b0, 255);
c[1].set_noclamp_rgba(r1, g1, b1, 255);
c[2].set_noclamp_rgba((r0 + r1) / 2, (g0 + g1) / 2, (b0 + b1) / 2, 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;
}
struct bc4_block
{
enum { cBC4SelectorBits = 3, cTotalSelectorBytes = 6, cMaxSelectorValues = 8 };
uint8_t m_endpoints[2];
uint8_t m_selectors[cTotalSelectorBytes];
inline uint32_t get_low_alpha() const { return m_endpoints[0]; }
inline uint32_t get_high_alpha() const { return m_endpoints[1]; }
inline bool is_alpha6_block() const { return get_low_alpha() <= get_high_alpha(); }
inline uint64_t get_selector_bits() const
{
return ((uint64_t)((uint32_t)m_selectors[0] | ((uint32_t)m_selectors[1] << 8U) | ((uint32_t)m_selectors[2] << 16U) | ((uint32_t)m_selectors[3] << 24U))) |
(((uint64_t)m_selectors[4]) << 32U) |
(((uint64_t)m_selectors[5]) << 40U);
}
inline uint32_t get_selector(uint32_t x, uint32_t y, uint64_t selector_bits) const
{
assert((x < 4U) && (y < 4U));
return (selector_bits >> (((y * 4) + x) * cBC4SelectorBits)) & (cMaxSelectorValues - 1);
}
static inline uint32_t get_block_values6(uint8_t *pDst, uint32_t l, uint32_t h)
{
pDst[0] = static_cast<uint8_t>(l);
pDst[1] = static_cast<uint8_t>(h);
pDst[2] = static_cast<uint8_t>((l * 4 + h) / 5);
pDst[3] = static_cast<uint8_t>((l * 3 + h * 2) / 5);
pDst[4] = static_cast<uint8_t>((l * 2 + h * 3) / 5);
pDst[5] = static_cast<uint8_t>((l + h * 4) / 5);
pDst[6] = 0;
pDst[7] = 255;
return 6;
}
static inline uint32_t get_block_values8(uint8_t *pDst, uint32_t l, uint32_t h)
{
pDst[0] = static_cast<uint8_t>(l);
pDst[1] = static_cast<uint8_t>(h);
pDst[2] = static_cast<uint8_t>((l * 6 + h) / 7);
pDst[3] = static_cast<uint8_t>((l * 5 + h * 2) / 7);
pDst[4] = static_cast<uint8_t>((l * 4 + h * 3) / 7);
pDst[5] = static_cast<uint8_t>((l * 3 + h * 4) / 7);
pDst[6] = static_cast<uint8_t>((l * 2 + h * 5) / 7);
pDst[7] = static_cast<uint8_t>((l + h * 6) / 7);
return 8;
}
static inline uint32_t get_block_values(uint8_t *pDst, uint32_t l, uint32_t h)
{
if (l > h)
return get_block_values8(pDst, l, h);
else
return get_block_values6(pDst, l, h);
}
};
void unpack_bc4(const void *pBlock_bits, uint8_t *pPixels, uint32_t stride)
{
static_assert(sizeof(bc4_block) == 8, "sizeof(bc4_block) == 8");
const bc4_block *pBlock = static_cast<const bc4_block *>(pBlock_bits);
uint8_t sel_values[8];
bc4_block::get_block_values(sel_values, pBlock->get_low_alpha(), pBlock->get_high_alpha());
const uint64_t selector_bits = pBlock->get_selector_bits();
for (uint32_t y = 0; y < 4; y++, pPixels += (stride * 4U))
{
pPixels[0] = sel_values[pBlock->get_selector(0, y, selector_bits)];
pPixels[stride * 1] = sel_values[pBlock->get_selector(1, y, selector_bits)];
pPixels[stride * 2] = sel_values[pBlock->get_selector(2, y, selector_bits)];
pPixels[stride * 3] = sel_values[pBlock->get_selector(3, y, selector_bits)];
}
}
// Returns false if the block uses 3-color punchthrough alpha mode, which isn't supported on some GPU's for BC3.
bool unpack_bc3(const void *pBlock_bits, color_rgba *pPixels)
{
bool success = true;
if (unpack_bc1((const uint8_t *)pBlock_bits + sizeof(bc4_block), pPixels, true))
success = false;
unpack_bc4(pBlock_bits, &pPixels[0].a, sizeof(color_rgba));
return success;
}
// writes RG
void unpack_bc5(const void *pBlock_bits, color_rgba *pPixels)
{
unpack_bc4(pBlock_bits, &pPixels[0].r, sizeof(color_rgba));
unpack_bc4((const uint8_t *)pBlock_bits + sizeof(bc4_block), &pPixels[0].g, sizeof(color_rgba));
}
struct bc7_mode_6
{
struct
{
uint64_t m_mode : 7;
uint64_t m_r0 : 7;
uint64_t m_r1 : 7;
uint64_t m_g0 : 7;
uint64_t m_g1 : 7;
uint64_t m_b0 : 7;
uint64_t m_b1 : 7;
uint64_t m_a0 : 7;
uint64_t m_a1 : 7;
uint64_t m_p0 : 1;
} m_lo;
union
{
struct
{
uint64_t m_p1 : 1;
uint64_t m_s00 : 3;
uint64_t m_s10 : 4;
uint64_t m_s20 : 4;
uint64_t m_s30 : 4;
uint64_t m_s01 : 4;
uint64_t m_s11 : 4;
uint64_t m_s21 : 4;
uint64_t m_s31 : 4;
uint64_t m_s02 : 4;
uint64_t m_s12 : 4;
uint64_t m_s22 : 4;
uint64_t m_s32 : 4;
uint64_t m_s03 : 4;
uint64_t m_s13 : 4;
uint64_t m_s23 : 4;
uint64_t m_s33 : 4;
} m_hi;
uint64_t m_hi_bits;
};
};
static const uint32_t g_bc7_weights4[16] = { 0, 4, 9, 13, 17, 21, 26, 30, 34, 38, 43, 47, 51, 55, 60, 64 };
// The transcoder only outputs mode 6 at the moment, so this is easy.
bool unpack_bc7_mode6(const void *pBlock_bits, color_rgba *pPixels)
{
static_assert(sizeof(bc7_mode_6) == 16, "sizeof(bc7_mode_6) == 16");
const bc7_mode_6 &block = *static_cast<const bc7_mode_6 *>(pBlock_bits);
if (block.m_lo.m_mode != (1 << 6))
return false;
const uint32_t r0 = (uint32_t)((block.m_lo.m_r0 << 1) | block.m_lo.m_p0);
const uint32_t g0 = (uint32_t)((block.m_lo.m_g0 << 1) | block.m_lo.m_p0);
const uint32_t b0 = (uint32_t)((block.m_lo.m_b0 << 1) | block.m_lo.m_p0);
const uint32_t a0 = (uint32_t)((block.m_lo.m_a0 << 1) | block.m_lo.m_p0);
const uint32_t r1 = (uint32_t)((block.m_lo.m_r1 << 1) | block.m_hi.m_p1);
const uint32_t g1 = (uint32_t)((block.m_lo.m_g1 << 1) | block.m_hi.m_p1);
const uint32_t b1 = (uint32_t)((block.m_lo.m_b1 << 1) | block.m_hi.m_p1);
const uint32_t a1 = (uint32_t)((block.m_lo.m_a1 << 1) | block.m_hi.m_p1);
color_rgba vals[16];
for (uint32_t i = 0; i < 16; i++)
{
const uint32_t w = g_bc7_weights4[i];
const uint32_t iw = 64 - w;
vals[i].set_noclamp_rgba(
(r0 * iw + r1 * w + 32) >> 6,
(g0 * iw + g1 * w + 32) >> 6,
(b0 * iw + b1 * w + 32) >> 6,
(a0 * iw + a1 * w + 32) >> 6);
}
pPixels[0] = vals[block.m_hi.m_s00];
pPixels[1] = vals[block.m_hi.m_s10];
pPixels[2] = vals[block.m_hi.m_s20];
pPixels[3] = vals[block.m_hi.m_s30];
pPixels[4] = vals[block.m_hi.m_s01];
pPixels[5] = vals[block.m_hi.m_s11];
pPixels[6] = vals[block.m_hi.m_s21];
pPixels[7] = vals[block.m_hi.m_s31];
pPixels[8] = vals[block.m_hi.m_s02];
pPixels[9] = vals[block.m_hi.m_s12];
pPixels[10] = vals[block.m_hi.m_s22];
pPixels[11] = vals[block.m_hi.m_s32];
pPixels[12] = vals[block.m_hi.m_s03];
pPixels[13] = vals[block.m_hi.m_s13];
pPixels[14] = vals[block.m_hi.m_s23];
pPixels[15] = vals[block.m_hi.m_s33];
return true;
}
// Unpacks to RGBA, R, RG, or A
bool unpack_block(texture_format fmt, const void* pBlock, color_rgba* pPixels)
{
switch (fmt)
{
case cBC1:
{
unpack_bc1(pBlock, pPixels, true);
break;
}
case cBC3:
{
return unpack_bc3(pBlock, pPixels);
}
case cBC4:
{
// Unpack to R
unpack_bc4(pBlock, &pPixels[0].r, sizeof(color_rgba));
break;
}
case cBC5:
{
unpack_bc5(pBlock, pPixels);
break;
}
case cBC7:
{
return unpack_bc7_mode6(pBlock, 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 cETC2_RGB:
case cETC1:
case cETC1S:
{
return unpack_etc1(*static_cast<const etc_block*>(pBlock), pPixels);
break;
}
case cETC2_RGBA:
{
if (!unpack_etc1(static_cast<const etc_block*>(pBlock)[1], pPixels))
return false;
unpack_etc2_eac(pBlock, pPixels);
break;
}
case cETC2_ALPHA:
{
// Unpack to A
unpack_etc2_eac(pBlock, pPixels);
break;
}
default:
{
assert(0);
// TODO
return false;
}
}
return true;
}
bool gpu_image::unpack(image& img, bool pvrtc_wrap_addressing) const
{
img.resize(get_width(), get_height());
img.set_all(g_black_color);
if (!img.get_width() || !img.get_height())
return true;
if ((m_fmt == cPVRTC1_4_RGB) || (m_fmt == cPVRTC1_4_RGBA))
{
if (!is_pow2(m_width) || !is_pow2(m_height))
{
// PVRTC1 images must use power of 2 dimensions
return false;
}
pvrtc4_image pi(m_width, m_height, pvrtc_wrap_addressing);
if (get_total_blocks() != pi.get_total_blocks())
return false;
memcpy(&pi.get_blocks()[0], get_ptr(), get_size_in_bytes());
pi.deswizzle();
pi.unpack_all_pixels(img);
return true;
}
color_rgba pixels[cMaxBlockSize * cMaxBlockSize];
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))
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;
}
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_ARB,
KTX_COMPRESSED_RGB_PVRTC_4BPPV1_IMG = 0x8C00,
KTX_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG,
};
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); }
};
bool create_ktx_texture_file(uint8_vec &ktx_data, const gpu_image_vec& g)
{
if (!g.size())
{
assert(0);
return false;
}
uint32_t internal_fmt = KTX_ETC1_RGB8_OES, base_internal_fmt = KTX_RGB;
switch (g[0].get_format())
{
case cBC1:
{
internal_fmt = KTX_COMPRESSED_RGB_S3TC_DXT1_EXT;
break;
}
case cBC3:
{
internal_fmt = KTX_COMPRESSED_RGBA_S3TC_DXT5_EXT;
base_internal_fmt = KTX_RGBA;
break;
}
case cBC4:
{
internal_fmt = KTX_COMPRESSED_RED_RGTC1_EXT;// KTX_COMPRESSED_LUMINANCE_LATC1_EXT;
base_internal_fmt = KTX_RED;
break;
}
case cBC5:
{
internal_fmt = KTX_COMPRESSED_RED_GREEN_RGTC2_EXT;
base_internal_fmt = KTX_RG;
break;
}
case cETC1:
case cETC1S:
{
internal_fmt = KTX_ETC1_RGB8_OES;
break;
}
case cETC2_RGB:
{
internal_fmt = KTX_COMPRESSED_RGB8_ETC2;
break;
}
case cETC2_RGBA:
{
internal_fmt = KTX_COMPRESSED_RGBA8_ETC2_EAC;
base_internal_fmt = KTX_RGBA;
break;
}
case cBC7:
{
internal_fmt = KTX_COMPRESSED_RGBA_BPTC_UNORM_ARB;
base_internal_fmt = KTX_RGBA;
break;
}
case cPVRTC1_4_RGB:
{
internal_fmt = KTX_COMPRESSED_RGB_PVRTC_4BPPV1_IMG;
break;
}
case cPVRTC1_4_RGBA:
{
internal_fmt = KTX_COMPRESSED_RGBA_PVRTC_4BPPV1_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 = g[0].get_width();
header.m_pixelHeight = g[0].get_height();
header.m_glInternalFormat = internal_fmt;
header.m_glBaseInternalFormat = base_internal_fmt;
header.m_numberOfMipmapLevels = (uint32_t)g.size();
header.m_numberOfFaces = 1;
append_vector(ktx_data, (uint8_t *)&header, sizeof(header));
for (uint32_t level = 0; level < g.size(); level++)
{
const gpu_image& img = g[level];
if (level)
{
if ( (img.get_format() != g[0].get_format()) ||
(img.get_width() != maximum<uint32_t>(1, g[0].get_width() >> level)) ||
(img.get_height() != maximum<uint32_t>(1, g[0].get_height() >> level)) )
{
// Bad input
assert(0);
return false;
}
}
packed_uint<4> img_size = (uint32_t)img.get_size_in_bytes();
assert(img_size && ((img_size & 3) == 0));
append_vector(ktx_data, (uint8_t *)&img_size, sizeof(img_size));
append_vector(ktx_data, (uint8_t *)img.get_ptr(), img.get_size_in_bytes());
}
return true;
}
bool write_compressed_texture_file(const char* pFilename, const gpu_image_vec& g)
{
std::string extension(string_tolower(string_get_extension(pFilename)));
uint8_vec filedata;
if (extension == "ktx")
{
if (!create_ktx_texture_file(filedata, g))
return false;
}
else if (extension == "pvr")
{
// TODO
return false;
}
else if (extension == "dds")
{
// TODO
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& g)
{
gpu_image_vec v;
v.push_back(g);
return write_compressed_texture_file(pFilename, v);
}
} // basisu
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