diff options
Diffstat (limited to 'thirdparty/basis_universal/encoder/basisu_gpu_texture.cpp')
| -rw-r--r-- | thirdparty/basis_universal/encoder/basisu_gpu_texture.cpp | 1622 |
1 files changed, 1622 insertions, 0 deletions
diff --git a/thirdparty/basis_universal/encoder/basisu_gpu_texture.cpp b/thirdparty/basis_universal/encoder/basisu_gpu_texture.cpp new file mode 100644 index 0000000000..3f9fb67bdd --- /dev/null +++ b/thirdparty/basis_universal/encoder/basisu_gpu_texture.cpp @@ -0,0 +1,1622 @@ +// basisu_gpu_texture.cpp +// Copyright (C) 2019-2021 Binomial LLC. All Rights Reserved. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +#include "basisu_gpu_texture.h" +#include "basisu_enc.h" +#include "basisu_pvrtc1_4.h" +#include "basisu_astc_decomp.h" +#include "basisu_bc7enc.h" + +namespace basisu +{ + 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); + + 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((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[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; + } + + bool unpack_bc1_nv(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]; + + 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 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); + + 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; + } + + 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)); + } + + // 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; + } + } + + // BC7 mode 0-7 decompression. + // Instead of one monster routine to unpack all the BC7 modes, we're lumping the 3 subset, 2 subset, 1 subset, and dual plane modes together into simple shared routines. + + static inline uint32_t bc7_dequant(uint32_t val, uint32_t pbit, uint32_t val_bits) { assert(val < (1U << val_bits)); assert(pbit < 2); assert(val_bits >= 4 && val_bits <= 8); const uint32_t total_bits = val_bits + 1; val = (val << 1) | pbit; val <<= (8 - total_bits); val |= (val >> total_bits); assert(val <= 255); return val; } + static inline uint32_t bc7_dequant(uint32_t val, uint32_t val_bits) { assert(val < (1U << val_bits)); assert(val_bits >= 4 && val_bits <= 8); val <<= (8 - val_bits); val |= (val >> val_bits); assert(val <= 255); return val; } + + static inline uint32_t bc7_interp2(uint32_t l, uint32_t h, uint32_t w) { assert(w < 4); return (l * (64 - basist::g_bc7_weights2[w]) + h * basist::g_bc7_weights2[w] + 32) >> 6; } + static inline uint32_t bc7_interp3(uint32_t l, uint32_t h, uint32_t w) { assert(w < 8); return (l * (64 - basist::g_bc7_weights3[w]) + h * basist::g_bc7_weights3[w] + 32) >> 6; } + static inline uint32_t bc7_interp4(uint32_t l, uint32_t h, uint32_t w) { assert(w < 16); return (l * (64 - basist::g_bc7_weights4[w]) + h * basist::g_bc7_weights4[w] + 32) >> 6; } + static inline uint32_t bc7_interp(uint32_t l, uint32_t h, uint32_t w, uint32_t bits) + { + assert(l <= 255 && h <= 255); + switch (bits) + { + case 2: return bc7_interp2(l, h, w); + case 3: return bc7_interp3(l, h, w); + case 4: return bc7_interp4(l, h, w); + default: + break; + } + return 0; + } + + bool unpack_bc7_mode0_2(uint32_t mode, const void* pBlock_bits, color_rgba* pPixels) + { + //const uint32_t SUBSETS = 3; + const uint32_t ENDPOINTS = 6; + const uint32_t COMPS = 3; + const uint32_t WEIGHT_BITS = (mode == 0) ? 3 : 2; + const uint32_t ENDPOINT_BITS = (mode == 0) ? 4 : 5; + const uint32_t PBITS = (mode == 0) ? 6 : 0; + const uint32_t WEIGHT_VALS = 1 << WEIGHT_BITS; + + uint32_t bit_offset = 0; + const uint8_t* pBuf = static_cast<const uint8_t*>(pBlock_bits); + + if (read_bits32(pBuf, bit_offset, mode + 1) != (1U << mode)) return false; + + const uint32_t part = read_bits32(pBuf, bit_offset, (mode == 0) ? 4 : 6); + + color_rgba endpoints[ENDPOINTS]; + for (uint32_t c = 0; c < COMPS; c++) + for (uint32_t e = 0; e < ENDPOINTS; e++) + endpoints[e][c] = (uint8_t)read_bits32(pBuf, bit_offset, ENDPOINT_BITS); + + uint32_t pbits[6]; + for (uint32_t p = 0; p < PBITS; p++) + pbits[p] = read_bits32(pBuf, bit_offset, 1); + + uint32_t weights[16]; + for (uint32_t i = 0; i < 16; i++) + weights[i] = read_bits32(pBuf, bit_offset, ((!i) || (i == basist::g_bc7_table_anchor_index_third_subset_1[part]) || (i == basist::g_bc7_table_anchor_index_third_subset_2[part])) ? (WEIGHT_BITS - 1) : WEIGHT_BITS); + + assert(bit_offset == 128); + + for (uint32_t e = 0; e < ENDPOINTS; e++) + for (uint32_t c = 0; c < 4; c++) + endpoints[e][c] = (uint8_t)((c == 3) ? 255 : (PBITS ? bc7_dequant(endpoints[e][c], pbits[e], ENDPOINT_BITS) : bc7_dequant(endpoints[e][c], ENDPOINT_BITS))); + + color_rgba block_colors[3][8]; + for (uint32_t s = 0; s < 3; s++) + for (uint32_t i = 0; i < WEIGHT_VALS; i++) + { + for (uint32_t c = 0; c < 3; c++) + block_colors[s][i][c] = (uint8_t)bc7_interp(endpoints[s * 2 + 0][c], endpoints[s * 2 + 1][c], i, WEIGHT_BITS); + block_colors[s][i][3] = 255; + } + + for (uint32_t i = 0; i < 16; i++) + pPixels[i] = block_colors[basist::g_bc7_partition3[part * 16 + i]][weights[i]]; + + return true; + } + + bool unpack_bc7_mode1_3_7(uint32_t mode, const void* pBlock_bits, color_rgba* pPixels) + { + //const uint32_t SUBSETS = 2; + const uint32_t ENDPOINTS = 4; + const uint32_t COMPS = (mode == 7) ? 4 : 3; + const uint32_t WEIGHT_BITS = (mode == 1) ? 3 : 2; + const uint32_t ENDPOINT_BITS = (mode == 7) ? 5 : ((mode == 1) ? 6 : 7); + const uint32_t PBITS = (mode == 1) ? 2 : 4; + const uint32_t SHARED_PBITS = (mode == 1) ? true : false; + const uint32_t WEIGHT_VALS = 1 << WEIGHT_BITS; + + uint32_t bit_offset = 0; + const uint8_t* pBuf = static_cast<const uint8_t*>(pBlock_bits); + + if (read_bits32(pBuf, bit_offset, mode + 1) != (1U << mode)) return false; + + const uint32_t part = read_bits32(pBuf, bit_offset, 6); + + color_rgba endpoints[ENDPOINTS]; + for (uint32_t c = 0; c < COMPS; c++) + for (uint32_t e = 0; e < ENDPOINTS; e++) + endpoints[e][c] = (uint8_t)read_bits32(pBuf, bit_offset, ENDPOINT_BITS); + + uint32_t pbits[4]; + for (uint32_t p = 0; p < PBITS; p++) + pbits[p] = read_bits32(pBuf, bit_offset, 1); + + uint32_t weights[16]; + for (uint32_t i = 0; i < 16; i++) + weights[i] = read_bits32(pBuf, bit_offset, ((!i) || (i == basist::g_bc7_table_anchor_index_second_subset[part])) ? (WEIGHT_BITS - 1) : WEIGHT_BITS); + + assert(bit_offset == 128); + + for (uint32_t e = 0; e < ENDPOINTS; e++) + for (uint32_t c = 0; c < 4; c++) + endpoints[e][c] = (uint8_t)((c == ((mode == 7U) ? 4U : 3U)) ? 255 : bc7_dequant(endpoints[e][c], pbits[SHARED_PBITS ? (e >> 1) : e], ENDPOINT_BITS)); + + color_rgba block_colors[2][8]; + for (uint32_t s = 0; s < 2; s++) + for (uint32_t i = 0; i < WEIGHT_VALS; i++) + { + for (uint32_t c = 0; c < COMPS; c++) + block_colors[s][i][c] = (uint8_t)bc7_interp(endpoints[s * 2 + 0][c], endpoints[s * 2 + 1][c], i, WEIGHT_BITS); + block_colors[s][i][3] = (COMPS == 3) ? 255 : block_colors[s][i][3]; + } + + for (uint32_t i = 0; i < 16; i++) + pPixels[i] = block_colors[basist::g_bc7_partition2[part * 16 + i]][weights[i]]; + + return true; + } + + bool unpack_bc7_mode4_5(uint32_t mode, const void* pBlock_bits, color_rgba* pPixels) + { + const uint32_t ENDPOINTS = 2; + const uint32_t COMPS = 4; + const uint32_t WEIGHT_BITS = 2; + const uint32_t A_WEIGHT_BITS = (mode == 4) ? 3 : 2; + const uint32_t ENDPOINT_BITS = (mode == 4) ? 5 : 7; + const uint32_t A_ENDPOINT_BITS = (mode == 4) ? 6 : 8; + //const uint32_t WEIGHT_VALS = 1 << WEIGHT_BITS; + //const uint32_t A_WEIGHT_VALS = 1 << A_WEIGHT_BITS; + + uint32_t bit_offset = 0; + const uint8_t* pBuf = static_cast<const uint8_t*>(pBlock_bits); + + if (read_bits32(pBuf, bit_offset, mode + 1) != (1U << mode)) return false; + + const uint32_t comp_rot = read_bits32(pBuf, bit_offset, 2); + const uint32_t index_mode = (mode == 4) ? read_bits32(pBuf, bit_offset, 1) : 0; + + color_rgba endpoints[ENDPOINTS]; + for (uint32_t c = 0; c < COMPS; c++) + for (uint32_t e = 0; e < ENDPOINTS; e++) + endpoints[e][c] = (uint8_t)read_bits32(pBuf, bit_offset, (c == 3) ? A_ENDPOINT_BITS : ENDPOINT_BITS); + + const uint32_t weight_bits[2] = { index_mode ? A_WEIGHT_BITS : WEIGHT_BITS, index_mode ? WEIGHT_BITS : A_WEIGHT_BITS }; + + uint32_t weights[16], a_weights[16]; + + for (uint32_t i = 0; i < 16; i++) + (index_mode ? a_weights : weights)[i] = read_bits32(pBuf, bit_offset, weight_bits[index_mode] - ((!i) ? 1 : 0)); + + for (uint32_t i = 0; i < 16; i++) + (index_mode ? weights : a_weights)[i] = read_bits32(pBuf, bit_offset, weight_bits[1 - index_mode] - ((!i) ? 1 : 0)); + + assert(bit_offset == 128); + + for (uint32_t e = 0; e < ENDPOINTS; e++) + for (uint32_t c = 0; c < 4; c++) + endpoints[e][c] = (uint8_t)bc7_dequant(endpoints[e][c], (c == 3) ? A_ENDPOINT_BITS : ENDPOINT_BITS); + + color_rgba block_colors[8]; + for (uint32_t i = 0; i < (1U << weight_bits[0]); i++) + for (uint32_t c = 0; c < 3; c++) + block_colors[i][c] = (uint8_t)bc7_interp(endpoints[0][c], endpoints[1][c], i, weight_bits[0]); + + for (uint32_t i = 0; i < (1U << weight_bits[1]); i++) + block_colors[i][3] = (uint8_t)bc7_interp(endpoints[0][3], endpoints[1][3], i, weight_bits[1]); + + for (uint32_t i = 0; i < 16; i++) + { + pPixels[i] = block_colors[weights[i]]; + pPixels[i].a = block_colors[a_weights[i]].a; + if (comp_rot >= 1) + std::swap(pPixels[i].a, pPixels[i].m_comps[comp_rot - 1]); + } + + return true; + } + + 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; + }; + }; + + 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 = basist::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; + } + + bool unpack_bc7(const void *pBlock, color_rgba *pPixels) + { + const uint32_t first_byte = static_cast<const uint8_t*>(pBlock)[0]; + + for (uint32_t mode = 0; mode <= 7; mode++) + { + if (first_byte & (1U << mode)) + { + switch (mode) + { + case 0: + case 2: + return unpack_bc7_mode0_2(mode, pBlock, pPixels); + case 1: + case 3: + case 7: + return unpack_bc7_mode1_3_7(mode, pBlock, pPixels); + case 4: + case 5: + return unpack_bc7_mode4_5(mode, pBlock, pPixels); + case 6: + return unpack_bc7_mode6(pBlock, pPixels); + default: + break; + } + } + } + + return false; + } + + 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; + } + + 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; + } + + 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); + } + } + + 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 + bool unpack_block(texture_format fmt, const void* pBlock, color_rgba* pPixels) + { + switch (fmt) + { + case texture_format::cBC1: + { + unpack_bc1(pBlock, 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: + { + return unpack_bc3(pBlock, pPixels); + } + case texture_format::cBC4: + { + // Unpack to R + unpack_bc4(pBlock, &pPixels[0].r, sizeof(color_rgba)); + break; + } + case texture_format::cBC5: + { + unpack_bc5(pBlock, pPixels); + break; + } + case texture_format::cBC7: + { + return unpack_bc7(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 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::cASTC4x4: + { + const bool astc_srgb = false; + basisu_astc::astc::decompress(reinterpret_cast<uint8_t*>(pPixels), static_cast<const uint8_t*>(pBlock), astc_srgb, 4, 4); + 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); + 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 gpu_image::unpack(image& img) 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(&pi.get_blocks()[0], 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]; + 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 = 0x8E8C, + KTX_COMPRESSED_SRGB_ALPHA_BPTC_UNORM = 0x8E8D, + KTX_COMPRESSED_RGB_PVRTC_4BPPV1_IMG = 0x8C00, + KTX_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG = 0x8C02, + KTX_COMPRESSED_RGBA_ASTC_4x4_KHR = 0x93B0, + KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR = 0x93D0, + 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) + { + if (!gpu_images.size()) + { + assert(0); + return false; + } + + uint32_t width = 0, height = 0, total_levels = 0; + basisu::texture_format fmt = texture_format::cInvalidTextureFormat; + + 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 = KTX_COMPRESSED_RGB_S3TC_DXT1_EXT; + break; + } + case texture_format::cBC3: + { + internal_fmt = KTX_COMPRESSED_RGBA_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: + { + internal_fmt = KTX_ETC1_RGB8_OES; + break; + } + case texture_format::cETC2_RGB: + { + internal_fmt = KTX_COMPRESSED_RGB8_ETC2; + break; + } + case texture_format::cETC2_RGBA: + { + internal_fmt = KTX_COMPRESSED_RGBA8_ETC2_EAC; + base_internal_fmt = KTX_RGBA; + break; + } + case texture_format::cBC7: + { + internal_fmt = KTX_COMPRESSED_RGBA_BPTC_UNORM; + base_internal_fmt = KTX_RGBA; + break; + } + case texture_format::cPVRTC1_4_RGB: + { + internal_fmt = KTX_COMPRESSED_RGB_PVRTC_4BPPV1_IMG; + break; + } + case texture_format::cPVRTC1_4_RGBA: + { + internal_fmt = KTX_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG; + base_internal_fmt = KTX_RGBA; + break; + } + case texture_format::cASTC4x4: + { + internal_fmt = KTX_COMPRESSED_RGBA_ASTC_4x4_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_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)); + + 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; + + 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 write_compressed_texture_file(const char* pFilename, const basisu::vector<gpu_image_vec>& g, bool cubemap_flag) + { + std::string extension(string_tolower(string_get_extension(pFilename))); + + uint8_vec filedata; + if (extension == "ktx") + { + if (!create_ktx_texture_file(filedata, g, cubemap_flag)) + 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) + { + basisu::vector<gpu_image_vec> v; + enlarge_vector(v, 1)->push_back(g); + return write_compressed_texture_file(pFilename, v, false); + } + + //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; + } +} // basisu + |