/* -*- tab-width: 4; -*- */ /* vi: set sw=2 ts=4 expandtab: */ /* Copyright 2019-2020 The Khronos Group Inc. * SPDX-License-Identifier: Apache-2.0 */ /** * @file * @~English * @brief Utilities for creating data format descriptors. */ /* * Author: Andrew Garrard */ #include #include #include "dfd.h" static uint32_t *writeHeader(int numSamples, int bytes, int suffix) { uint32_t *DFD = (uint32_t *) malloc(sizeof(uint32_t) * (1 + KHR_DF_WORD_SAMPLESTART + numSamples * KHR_DF_WORD_SAMPLEWORDS)); uint32_t* BDFD = DFD+1; DFD[0] = sizeof(uint32_t) * (1 + KHR_DF_WORD_SAMPLESTART + numSamples * KHR_DF_WORD_SAMPLEWORDS); BDFD[KHR_DF_WORD_VENDORID] = (KHR_DF_VENDORID_KHRONOS << KHR_DF_SHIFT_VENDORID) | (KHR_DF_KHR_DESCRIPTORTYPE_BASICFORMAT << KHR_DF_SHIFT_DESCRIPTORTYPE); BDFD[KHR_DF_WORD_VERSIONNUMBER] = (KHR_DF_VERSIONNUMBER_LATEST << KHR_DF_SHIFT_VERSIONNUMBER) | (((uint32_t)sizeof(uint32_t) * (KHR_DF_WORD_SAMPLESTART + numSamples * KHR_DF_WORD_SAMPLEWORDS) << KHR_DF_SHIFT_DESCRIPTORBLOCKSIZE)); BDFD[KHR_DF_WORD_MODEL] = ((KHR_DF_MODEL_RGBSDA << KHR_DF_SHIFT_MODEL) | /* Only supported model */ (KHR_DF_PRIMARIES_BT709 << KHR_DF_SHIFT_PRIMARIES) | /* Assumed */ (KHR_DF_FLAG_ALPHA_STRAIGHT << KHR_DF_SHIFT_FLAGS)); if (suffix == s_SRGB) { BDFD[KHR_DF_WORD_TRANSFER] |= KHR_DF_TRANSFER_SRGB << KHR_DF_SHIFT_TRANSFER; } else { BDFD[KHR_DF_WORD_TRANSFER] |= KHR_DF_TRANSFER_LINEAR << KHR_DF_SHIFT_TRANSFER; } BDFD[KHR_DF_WORD_TEXELBLOCKDIMENSION0] = 0; /* Only 1x1x1x1 texel blocks supported */ BDFD[KHR_DF_WORD_BYTESPLANE0] = bytes; /* bytesPlane0 = bytes, bytesPlane3..1 = 0 */ BDFD[KHR_DF_WORD_BYTESPLANE4] = 0; /* bytesPlane7..5 = 0 */ return DFD; } static uint32_t setChannelFlags(uint32_t channel, enum VkSuffix suffix) { switch (suffix) { case s_UNORM: break; case s_SNORM: channel |= KHR_DF_SAMPLE_DATATYPE_SIGNED; break; case s_USCALED: break; case s_SSCALED: channel |= KHR_DF_SAMPLE_DATATYPE_SIGNED; break; case s_UINT: break; case s_SINT: channel |= KHR_DF_SAMPLE_DATATYPE_SIGNED; break; case s_SFLOAT: channel |= KHR_DF_SAMPLE_DATATYPE_FLOAT | KHR_DF_SAMPLE_DATATYPE_SIGNED; break; case s_UFLOAT: channel |= KHR_DF_SAMPLE_DATATYPE_FLOAT; break; case s_SRGB: if (channel == KHR_DF_CHANNEL_RGBSDA_ALPHA) { channel |= KHR_DF_SAMPLE_DATATYPE_LINEAR; } break; } return channel; } static void writeSample(uint32_t *DFD, int sampleNo, int channel, int bits, int offset, int topSample, int bottomSample, enum VkSuffix suffix) { // Use this to avoid type-punning complaints from the gcc optimizer // with -Wall. union { uint32_t i; float f; } lower, upper; uint32_t *sample = DFD + 1 + KHR_DF_WORD_SAMPLESTART + sampleNo * KHR_DF_WORD_SAMPLEWORDS; if (channel == 3) channel = KHR_DF_CHANNEL_RGBSDA_ALPHA; if (channel == 3) channel = KHR_DF_CHANNEL_RGBSDA_ALPHA; channel = setChannelFlags(channel, suffix); sample[KHR_DF_SAMPLEWORD_BITOFFSET] = (offset << KHR_DF_SAMPLESHIFT_BITOFFSET) | ((bits - 1) << KHR_DF_SAMPLESHIFT_BITLENGTH) | (channel << KHR_DF_SAMPLESHIFT_CHANNELID); sample[KHR_DF_SAMPLEWORD_SAMPLEPOSITION_ALL] = 0; switch (suffix) { case s_UNORM: case s_SRGB: default: if (bits > 32) { upper.i = 0xFFFFFFFFU; } else { upper.i = (uint32_t)((1U << bits) - 1U); } lower.i = 0U; break; case s_SNORM: if (bits > 32) { upper.i = 0x7FFFFFFF; } else { upper.i = topSample ? (1U << (bits - 1)) - 1 : (1U << bits) - 1; } lower.i = ~upper.i; if (bottomSample) lower.i += 1; break; case s_USCALED: case s_UINT: upper.i = bottomSample ? 1U : 0U; lower.i = 0U; break; case s_SSCALED: case s_SINT: upper.i = bottomSample ? 1U : 0U; lower.i = ~0U; break; case s_SFLOAT: upper.f = 1.0f; lower.f = -1.0f; break; case s_UFLOAT: upper.f = 1.0f; lower.f = 0.0f; break; } sample[KHR_DF_SAMPLEWORD_SAMPLELOWER] = lower.i; sample[KHR_DF_SAMPLEWORD_SAMPLEUPPER] = upper.i; } /** * @~English * @brief Create a Data Format Descriptor for an unpacked format. * * @param bigEndian Set to 1 for big-endian byte ordering and 0 for little-endian byte ordering. * @param numChannels The number of color channels. * @param bytes The number of bytes per channel. * @param redBlueSwap Normally channels appear in consecutive R, G, B, A order * in memory; redBlueSwap inverts red and blue, allowing * B, G, R, A. * @param suffix Indicates the format suffix for the type. * * @return A data format descriptor in malloc'd data. The caller is responsible * for freeing the descriptor. **/ uint32_t *createDFDUnpacked(int bigEndian, int numChannels, int bytes, int redBlueSwap, enum VkSuffix suffix) { uint32_t *DFD; if (bigEndian) { int channelCounter, channelByte; /* Number of samples = number of channels * bytes per channel */ DFD = writeHeader(numChannels * bytes, numChannels * bytes, suffix); /* First loop over the channels */ for (channelCounter = 0; channelCounter < numChannels; ++channelCounter) { int channel = channelCounter; if (redBlueSwap && (channel == 0 || channel == 2)) { channel ^= 2; } /* Loop over the bytes that constitute a channel */ for (channelByte = 0; channelByte < bytes; ++channelByte) { writeSample(DFD, channelCounter * bytes + channelByte, channel, 8, 8 * (channelCounter * bytes + bytes - channelByte - 1), channelByte == bytes-1, channelByte == 0, suffix); } } } else { /* Little-endian */ int sampleCounter; /* One sample per channel */ DFD = writeHeader(numChannels, numChannels * bytes, suffix); for (sampleCounter = 0; sampleCounter < numChannels; ++sampleCounter) { int channel = sampleCounter; if (redBlueSwap && (channel == 0 || channel == 2)) { channel ^= 2; } writeSample(DFD, sampleCounter, channel, 8 * bytes, 8 * sampleCounter * bytes, 1, 1, suffix); } } return DFD; } /** * @~English * @brief Create a Data Format Descriptor for a packed format. * * @param bigEndian Big-endian flag: Set to 1 for big-endian byte ordering and * 0 for little-endian byte ordering. * @param numChannels The number of color channels. * @param bits[] An array of length numChannels. * Each entry is the number of bits composing the channel, in * order starting at bit 0 of the packed type. * @param channels[] An array of length numChannels. * Each entry enumerates the channel type: 0 = red, 1 = green, * 2 = blue, 15 = alpha, in order starting at bit 0 of the * packed type. These values match channel IDs for RGBSDA in * the Khronos Data Format header. To simplify iteration * through channels, channel id 3 is a synonym for alpha. * @param suffix Indicates the format suffix for the type. * * @return A data format descriptor in malloc'd data. The caller is responsible * for freeing the descriptor. **/ uint32_t *createDFDPacked(int bigEndian, int numChannels, int bits[], int channels[], enum VkSuffix suffix) { uint32_t *DFD = 0; if (numChannels == 6) { /* Special case E5B9G9R9 */ DFD = writeHeader(numChannels, 4, s_UFLOAT); writeSample(DFD, 0, 0, 9, 0, 1, 1, s_UNORM); KHR_DFDSETSVAL((DFD+1), 0, SAMPLEUPPER, 8448); writeSample(DFD, 1, 0 | KHR_DF_SAMPLE_DATATYPE_EXPONENT, 5, 27, 1, 1, s_UNORM); KHR_DFDSETSVAL((DFD+1), 1, SAMPLELOWER, 15); KHR_DFDSETSVAL((DFD+1), 1, SAMPLEUPPER, 31); writeSample(DFD, 2, 1, 9, 9, 1, 1, s_UNORM); KHR_DFDSETSVAL((DFD+1), 2, SAMPLEUPPER, 8448); writeSample(DFD, 3, 1 | KHR_DF_SAMPLE_DATATYPE_EXPONENT, 5, 27, 1, 1, s_UNORM); KHR_DFDSETSVAL((DFD+1), 3, SAMPLELOWER, 15); KHR_DFDSETSVAL((DFD+1), 3, SAMPLEUPPER, 31); writeSample(DFD, 4, 2, 9, 18, 1, 1, s_UNORM); KHR_DFDSETSVAL((DFD+1), 4, SAMPLEUPPER, 8448); writeSample(DFD, 5, 2 | KHR_DF_SAMPLE_DATATYPE_EXPONENT, 5, 27, 1, 1, s_UNORM); KHR_DFDSETSVAL((DFD+1), 5, SAMPLELOWER, 15); KHR_DFDSETSVAL((DFD+1), 5, SAMPLEUPPER, 31); } else if (bigEndian) { /* No packed format is larger than 32 bits. */ /* No packed channel crosses more than two bytes. */ int totalBits = 0; int bitChannel[32]; int beChannelStart[4]; int channelCounter; int bitOffset = 0; int BEMask; int numSamples = numChannels; int sampleCounter; for (channelCounter = 0; channelCounter < numChannels; ++channelCounter) { beChannelStart[channelCounter] = totalBits; totalBits += bits[channelCounter]; } BEMask = (totalBits - 1) & 0x18; for (channelCounter = 0; channelCounter < numChannels; ++channelCounter) { bitChannel[bitOffset ^ BEMask] = channelCounter; if (((bitOffset + bits[channelCounter] - 1) & ~7) != (bitOffset & ~7)) { /* Continuation sample */ bitChannel[((bitOffset + bits[channelCounter] - 1) & ~7) ^ BEMask] = channelCounter; numSamples++; } bitOffset += bits[channelCounter]; } DFD = writeHeader(numSamples, totalBits >> 3, suffix); sampleCounter = 0; for (bitOffset = 0; bitOffset < totalBits;) { if (bitChannel[bitOffset] == -1) { /* Done this bit, so this is the lower half of something. */ /* We must therefore jump to the end of the byte and continue. */ bitOffset = (bitOffset + 8) & ~7; } else { /* Start of a channel? */ int thisChannel = bitChannel[bitOffset]; if ((beChannelStart[thisChannel] ^ BEMask) == bitOffset) { /* Must be just one sample if we hit it first. */ writeSample(DFD, sampleCounter++, channels[thisChannel], bits[thisChannel], bitOffset, 1, 1, suffix); bitOffset += bits[thisChannel]; } else { /* Two samples. Move to the end of the first one we hit when we're done. */ int firstSampleBits = 8 - (beChannelStart[thisChannel] & 0x7); /* Rest of the byte */ int secondSampleBits = bits[thisChannel] - firstSampleBits; /* Rest of the bits */ writeSample(DFD, sampleCounter++, channels[thisChannel], firstSampleBits, beChannelStart[thisChannel] ^ BEMask, 0, 1, suffix); /* Mark that we've already handled this sample */ bitChannel[beChannelStart[thisChannel] ^ BEMask] = -1; writeSample(DFD, sampleCounter++, channels[thisChannel], secondSampleBits, bitOffset, 1, 0, suffix); bitOffset += secondSampleBits; } } } } else { /* Little-endian */ int sampleCounter; int totalBits = 0; int bitOffset = 0; for (sampleCounter = 0; sampleCounter < numChannels; ++sampleCounter) { totalBits += bits[sampleCounter]; } /* One sample per channel */ DFD = writeHeader(numChannels, totalBits >> 3, suffix); for (sampleCounter = 0; sampleCounter < numChannels; ++sampleCounter) { writeSample(DFD, sampleCounter, channels[sampleCounter], bits[sampleCounter], bitOffset, 1, 1, suffix); bitOffset += bits[sampleCounter]; } } return DFD; } static khr_df_model_e compModelMapping[] = { KHR_DF_MODEL_BC1A, /*!< BC1, aka DXT1, no alpha. */ KHR_DF_MODEL_BC1A, /*!< BC1, aka DXT1, punch-through alpha. */ KHR_DF_MODEL_BC2, /*!< BC2, aka DXT2 and DXT3. */ KHR_DF_MODEL_BC3, /*!< BC3, aka DXT4 and DXT5. */ KHR_DF_MODEL_BC4, /*!< BC4. */ KHR_DF_MODEL_BC5, /*!< BC5. */ KHR_DF_MODEL_BC6H, /*!< BC6h HDR format. */ KHR_DF_MODEL_BC7, /*!< BC7. */ KHR_DF_MODEL_ETC2, /*!< ETC2 no alpha. */ KHR_DF_MODEL_ETC2, /*!< ETC2 punch-through alpha. */ KHR_DF_MODEL_ETC2, /*!< ETC2 independent alpha. */ KHR_DF_MODEL_ETC2, /*!< R11 ETC2 single-channel. */ KHR_DF_MODEL_ETC2, /*!< R11G11 ETC2 dual-channel. */ KHR_DF_MODEL_ASTC, /*!< ASTC. */ KHR_DF_MODEL_ETC1S, /*!< ETC1S. */ KHR_DF_MODEL_PVRTC, /*!< PVRTC(1). */ KHR_DF_MODEL_PVRTC2 /*!< PVRTC2. */ }; static uint32_t compSampleCount[] = { 1U, /*!< BC1, aka DXT1, no alpha. */ 1U, /*!< BC1, aka DXT1, punch-through alpha. */ 2U, /*!< BC2, aka DXT2 and DXT3. */ 2U, /*!< BC3, aka DXT4 and DXT5. */ 1U, /*!< BC4. */ 2U, /*!< BC5. */ 1U, /*!< BC6h HDR format. */ 1U, /*!< BC7. */ 1U, /*!< ETC2 no alpha. */ 2U, /*!< ETC2 punch-through alpha. */ 2U, /*!< ETC2 independent alpha. */ 1U, /*!< R11 ETC2 single-channel. */ 2U, /*!< R11G11 ETC2 dual-channel. */ 1U, /*!< ASTC. */ 1U, /*!< ETC1S. */ 1U, /*!< PVRTC. */ 1U /*!< PVRTC2. */ }; static khr_df_model_channels_e compFirstChannel[] = { KHR_DF_CHANNEL_BC1A_COLOR, /*!< BC1, aka DXT1, no alpha. */ KHR_DF_CHANNEL_BC1A_ALPHAPRESENT, /*!< BC1, aka DXT1, punch-through alpha. */ KHR_DF_CHANNEL_BC2_ALPHA, /*!< BC2, aka DXT2 and DXT3. */ KHR_DF_CHANNEL_BC3_ALPHA, /*!< BC3, aka DXT4 and DXT5. */ KHR_DF_CHANNEL_BC4_DATA, /*!< BC4. */ KHR_DF_CHANNEL_BC5_RED, /*!< BC5. */ KHR_DF_CHANNEL_BC6H_COLOR, /*!< BC6h HDR format. */ KHR_DF_CHANNEL_BC7_COLOR, /*!< BC7. */ KHR_DF_CHANNEL_ETC2_COLOR, /*!< ETC2 no alpha. */ KHR_DF_CHANNEL_ETC2_COLOR, /*!< ETC2 punch-through alpha. */ KHR_DF_CHANNEL_ETC2_ALPHA, /*!< ETC2 independent alpha. */ KHR_DF_CHANNEL_ETC2_RED, /*!< R11 ETC2 single-channel. */ KHR_DF_CHANNEL_ETC2_RED, /*!< R11G11 ETC2 dual-channel. */ KHR_DF_CHANNEL_ASTC_DATA, /*!< ASTC. */ KHR_DF_CHANNEL_ETC1S_RGB, /*!< ETC1S. */ KHR_DF_CHANNEL_PVRTC_COLOR, /*!< PVRTC. */ KHR_DF_CHANNEL_PVRTC2_COLOR /*!< PVRTC2. */ }; static khr_df_model_channels_e compSecondChannel[] = { KHR_DF_CHANNEL_BC1A_COLOR, /*!< BC1, aka DXT1, no alpha. */ KHR_DF_CHANNEL_BC1A_ALPHAPRESENT, /*!< BC1, aka DXT1, punch-through alpha. */ KHR_DF_CHANNEL_BC2_COLOR, /*!< BC2, aka DXT2 and DXT3. */ KHR_DF_CHANNEL_BC3_COLOR, /*!< BC3, aka DXT4 and DXT5. */ KHR_DF_CHANNEL_BC4_DATA, /*!< BC4. */ KHR_DF_CHANNEL_BC5_GREEN, /*!< BC5. */ KHR_DF_CHANNEL_BC6H_COLOR, /*!< BC6h HDR format. */ KHR_DF_CHANNEL_BC7_COLOR, /*!< BC7. */ KHR_DF_CHANNEL_ETC2_COLOR, /*!< ETC2 no alpha. */ KHR_DF_CHANNEL_ETC2_ALPHA, /*!< ETC2 punch-through alpha. */ KHR_DF_CHANNEL_ETC2_COLOR, /*!< ETC2 independent alpha. */ KHR_DF_CHANNEL_ETC2_RED, /*!< R11 ETC2 single-channel. */ KHR_DF_CHANNEL_ETC2_GREEN, /*!< R11G11 ETC2 dual-channel. */ KHR_DF_CHANNEL_ASTC_DATA, /*!< ASTC. */ KHR_DF_CHANNEL_ETC1S_RGB, /*!< ETC1S. */ KHR_DF_CHANNEL_PVRTC_COLOR, /*!< PVRTC. */ KHR_DF_CHANNEL_PVRTC2_COLOR /*!< PVRTC2. */ }; static uint32_t compSecondChannelOffset[] = { 0U, /*!< BC1, aka DXT1, no alpha. */ 0U, /*!< BC1, aka DXT1, punch-through alpha. */ 64U, /*!< BC2, aka DXT2 and DXT3. */ 64U, /*!< BC3, aka DXT4 and DXT5. */ 0U, /*!< BC4. */ 64U, /*!< BC5. */ 0U, /*!< BC6h HDR format. */ 0U, /*!< BC7. */ 0U, /*!< ETC2 no alpha. */ 0U, /*!< ETC2 punch-through alpha. */ 64U, /*!< ETC2 independent alpha. */ 0U, /*!< R11 ETC2 single-channel. */ 64U, /*!< R11G11 ETC2 dual-channel. */ 0U, /*!< ASTC. */ 0U, /*!< ETC1S. */ 0U, /*!< PVRTC. */ 0U /*!< PVRTC2. */ }; static uint32_t compChannelBits[] = { 64U, /*!< BC1, aka DXT1, no alpha. */ 64U, /*!< BC1, aka DXT1, punch-through alpha. */ 64U, /*!< BC2, aka DXT2 and DXT3. */ 64U, /*!< BC3, aka DXT4 and DXT5. */ 64U, /*!< BC4. */ 64U, /*!< BC5. */ 128U, /*!< BC6h HDR format. */ 128U, /*!< BC7. */ 64U, /*!< ETC2 no alpha. */ 64U, /*!< ETC2 punch-through alpha. */ 64U, /*!< ETC2 independent alpha. */ 64U, /*!< R11 ETC2 single-channel. */ 64U, /*!< R11G11 ETC2 dual-channel. */ 128U, /*!< ASTC. */ 64U, /*!< ETC1S. */ 64U, /*!< PVRTC. */ 64U /*!< PVRTC2. */ }; static uint32_t compBytes[] = { 8U, /*!< BC1, aka DXT1, no alpha. */ 8U, /*!< BC1, aka DXT1, punch-through alpha. */ 16U, /*!< BC2, aka DXT2 and DXT3. */ 16U, /*!< BC3, aka DXT4 and DXT5. */ 8U, /*!< BC4. */ 16U, /*!< BC5. */ 16U, /*!< BC6h HDR format. */ 16U, /*!< BC7. */ 8U, /*!< ETC2 no alpha. */ 8U, /*!< ETC2 punch-through alpha. */ 16U, /*!< ETC2 independent alpha. */ 8U, /*!< R11 ETC2 single-channel. */ 16U, /*!< R11G11 ETC2 dual-channel. */ 16U, /*!< ASTC. */ 8U, /*!< ETC1S. */ 8U, /*!< PVRTC. */ 8U /*!< PVRTC2. */ }; /** * @~English * @brief Create a Data Format Descriptor for a compressed format. * * @param compScheme Vulkan-style compression scheme enumeration. * @param bwidth Block width in texel coordinates. * @param bheight Block height in texel coordinates. * @param bdepth Block depth in texel coordinates. * @author Mark Callow, Edgewise Consulting. * @param suffix Indicates the format suffix for the type. * * @return A data format descriptor in malloc'd data. The caller is responsible * for freeing the descriptor. **/ uint32_t *createDFDCompressed(enum VkCompScheme compScheme, int bwidth, int bheight, int bdepth, enum VkSuffix suffix) { uint32_t *DFD = 0; uint32_t numSamples = compSampleCount[compScheme]; uint32_t* BDFD; uint32_t *sample; uint32_t channel; // Use union to avoid type-punning complaints from gcc optimizer // with -Wall. union { uint32_t i; float f; } lower, upper; DFD = (uint32_t *) malloc(sizeof(uint32_t) * (1 + KHR_DF_WORD_SAMPLESTART + numSamples * KHR_DF_WORD_SAMPLEWORDS)); BDFD = DFD+1; DFD[0] = sizeof(uint32_t) * (1 + KHR_DF_WORD_SAMPLESTART + numSamples * KHR_DF_WORD_SAMPLEWORDS); BDFD[KHR_DF_WORD_VENDORID] = (KHR_DF_VENDORID_KHRONOS << KHR_DF_SHIFT_VENDORID) | (KHR_DF_KHR_DESCRIPTORTYPE_BASICFORMAT << KHR_DF_SHIFT_DESCRIPTORTYPE); BDFD[KHR_DF_WORD_VERSIONNUMBER] = (KHR_DF_VERSIONNUMBER_LATEST << KHR_DF_SHIFT_VERSIONNUMBER) | (((uint32_t)sizeof(uint32_t) * (KHR_DF_WORD_SAMPLESTART + numSamples * KHR_DF_WORD_SAMPLEWORDS) << KHR_DF_SHIFT_DESCRIPTORBLOCKSIZE)); BDFD[KHR_DF_WORD_MODEL] = ((compModelMapping[compScheme] << KHR_DF_SHIFT_MODEL) | (KHR_DF_PRIMARIES_BT709 << KHR_DF_SHIFT_PRIMARIES) | /* Assumed */ (KHR_DF_FLAG_ALPHA_STRAIGHT << KHR_DF_SHIFT_FLAGS)); if (suffix == s_SRGB) { BDFD[KHR_DF_WORD_TRANSFER] |= KHR_DF_TRANSFER_SRGB << KHR_DF_SHIFT_TRANSFER; } else { BDFD[KHR_DF_WORD_TRANSFER] |= KHR_DF_TRANSFER_LINEAR << KHR_DF_SHIFT_TRANSFER; } BDFD[KHR_DF_WORD_TEXELBLOCKDIMENSION0] = (bwidth - 1) | ((bheight - 1) << KHR_DF_SHIFT_TEXELBLOCKDIMENSION1) | ((bdepth - 1) << KHR_DF_SHIFT_TEXELBLOCKDIMENSION2); /* bytesPlane0 = bytes, bytesPlane3..1 = 0 */ BDFD[KHR_DF_WORD_BYTESPLANE0] = compBytes[compScheme]; BDFD[KHR_DF_WORD_BYTESPLANE4] = 0; /* bytesPlane7..5 = 0 */ sample = BDFD + KHR_DF_WORD_SAMPLESTART; channel = compFirstChannel[compScheme]; channel = setChannelFlags(channel, suffix); sample[KHR_DF_SAMPLEWORD_BITOFFSET] = (0 << KHR_DF_SAMPLESHIFT_BITOFFSET) | ((compChannelBits[compScheme] - 1) << KHR_DF_SAMPLESHIFT_BITLENGTH) | (channel << KHR_DF_SAMPLESHIFT_CHANNELID); sample[KHR_DF_SAMPLEWORD_SAMPLEPOSITION_ALL] = 0; switch (suffix) { case s_UNORM: case s_SRGB: default: upper.i = 0xFFFFFFFFU; lower.i = 0U; break; case s_SNORM: upper.i = 0x7FFFFFFF; lower.i = ~upper.i; break; case s_USCALED: case s_UINT: upper.i = 1U; lower.i = 0U; break; case s_SSCALED: case s_SINT: upper.i = 1U; lower.i = ~0U; break; case s_SFLOAT: upper.f = 1.0f; lower.f = -1.0f; break; case s_UFLOAT: upper.f = 1.0f; lower.f = 0.0f; break; } sample[KHR_DF_SAMPLEWORD_SAMPLELOWER] = lower.i; sample[KHR_DF_SAMPLEWORD_SAMPLEUPPER] = upper.i; if (compSampleCount[compScheme] > 1) { sample += KHR_DF_WORD_SAMPLEWORDS; channel = compSecondChannel[compScheme]; channel = setChannelFlags(channel, suffix); sample[KHR_DF_SAMPLEWORD_BITOFFSET] = (compSecondChannelOffset[compScheme] << KHR_DF_SAMPLESHIFT_BITOFFSET) | ((compChannelBits[compScheme] - 1) << KHR_DF_SAMPLESHIFT_BITLENGTH) | (channel << KHR_DF_SAMPLESHIFT_CHANNELID); sample[KHR_DF_SAMPLEWORD_SAMPLEPOSITION_ALL] = 0; sample[KHR_DF_SAMPLEWORD_SAMPLELOWER] = lower.i; sample[KHR_DF_SAMPLEWORD_SAMPLEUPPER] = upper.i; } return DFD; } /** * @~English * @brief Create a Data Format Descriptor for a depth-stencil format. * * @param depthBits The numeber of bits in the depth channel. * @param stencilBits The numeber of bits in the stencil channel. * @param sizeBytes The total byte size of the texel. * * @return A data format descriptor in malloc'd data. The caller is responsible * for freeing the descriptor. **/ uint32_t *createDFDDepthStencil(int depthBits, int stencilBits, int sizeBytes) { /* N.B. Little-endian is assumed. */ uint32_t *DFD = 0; DFD = writeHeader((depthBits > 0) + (stencilBits > 0), sizeBytes, s_UNORM); if (depthBits == 32) { writeSample(DFD, 0, KHR_DF_CHANNEL_RGBSDA_DEPTH, 32, 0, 1, 1, s_SFLOAT); } else if (depthBits > 0) { writeSample(DFD, 0, KHR_DF_CHANNEL_RGBSDA_DEPTH, depthBits, 0, 1, 1, s_UNORM); } if (stencilBits > 0) { if (depthBits > 0) { writeSample(DFD, 1, KHR_DF_CHANNEL_RGBSDA_STENCIL, stencilBits, depthBits, 1, 1, s_UINT); } else { writeSample(DFD, 0, KHR_DF_CHANNEL_RGBSDA_STENCIL, stencilBits, 0, 1, 1, s_UINT); } } return DFD; }