171 lines
6.2 KiB
C++
171 lines
6.2 KiB
C++
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/* -*- tab-width: 4; -*- */
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/* vi: set sw=2 ts=4 expandtab: */
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/* Copyright 2019-2020 The Khronos Group Inc.
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @~English
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* @brief Header file defining the data format descriptor utilities API.
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*/
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/*
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* Author: Andrew Garrard
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*/
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#ifndef _DFD_H_
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#define _DFD_H_
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#include <KHR/khr_df.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** Qualifier suffix to the format, in Vulkan terms. */
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enum VkSuffix {
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s_UNORM, /*!< Unsigned normalized format. */
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s_SNORM, /*!< Signed normalized format. */
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s_USCALED, /*!< Unsigned scaled format. */
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s_SSCALED, /*!< Signed scaled format. */
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s_UINT, /*!< Unsigned integer format. */
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s_SINT, /*!< Signed integer format. */
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s_SFLOAT, /*!< Signed float format. */
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s_UFLOAT, /*!< Unsigned float format. */
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s_SRGB /*!< sRGB normalized format. */
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};
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/** Compression scheme, in Vulkan terms. */
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enum VkCompScheme {
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c_BC1_RGB, /*!< BC1, aka DXT1, no alpha. */
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c_BC1_RGBA, /*!< BC1, aka DXT1, punch-through alpha. */
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c_BC2, /*!< BC2, aka DXT2 and DXT3. */
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c_BC3, /*!< BC3, aka DXT4 and DXT5. */
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c_BC4, /*!< BC4. */
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c_BC5, /*!< BC5. */
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c_BC6H, /*!< BC6h HDR format. */
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c_BC7, /*!< BC7. */
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c_ETC2_R8G8B8, /*!< ETC2 no alpha. */
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c_ETC2_R8G8B8A1, /*!< ETC2 punch-through alpha. */
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c_ETC2_R8G8B8A8, /*!< ETC2 independent alpha. */
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c_EAC_R11, /*!< R11 ETC2 single-channel. */
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c_EAC_R11G11, /*!< R11G11 ETC2 dual-channel. */
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c_ASTC, /*!< ASTC. */
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c_ETC1S, /*!< ETC1S. */
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c_PVRTC, /*!< PVRTC(1). */
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c_PVRTC2 /*!< PVRTC2. */
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};
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typedef unsigned int uint32_t;
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#if !defined(LIBKTX)
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#include <vulkan/vulkan_core.h>
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#else
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#include "../vkformat_enum.h"
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#endif
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uint32_t* vk2dfd(enum VkFormat format);
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/* Create a Data Format Descriptor for an unpacked format. */
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uint32_t *createDFDUnpacked(int bigEndian, int numChannels, int bytes,
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int redBlueSwap, enum VkSuffix suffix);
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/* Create a Data Format Descriptor for a packed format. */
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uint32_t *createDFDPacked(int bigEndian, int numChannels,
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int bits[], int channels[],
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enum VkSuffix suffix);
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/* Create a Data Format Descriptor for a compressed format. */
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uint32_t *createDFDCompressed(enum VkCompScheme compScheme,
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int bwidth, int bheight, int bdepth,
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enum VkSuffix suffix);
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/* Create a Data Format Descriptor for a depth/stencil format. */
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uint32_t *createDFDDepthStencil(int depthBits,
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int stencilBits,
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int sizeBytes);
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/** @brief Result of interpreting the data format descriptor. */
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enum InterpretDFDResult {
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i_LITTLE_ENDIAN_FORMAT_BIT = 0, /*!< Confirmed little-endian (default for 8bpc). */
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i_BIG_ENDIAN_FORMAT_BIT = 1, /*!< Confirmed big-endian. */
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i_PACKED_FORMAT_BIT = 2, /*!< Packed format. */
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i_SRGB_FORMAT_BIT = 4, /*!< sRGB transfer function. */
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i_NORMALIZED_FORMAT_BIT = 8, /*!< Normalized (UNORM or SNORM). */
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i_SIGNED_FORMAT_BIT = 16, /*!< Format is signed. */
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i_FLOAT_FORMAT_BIT = 32, /*!< Format is floating point. */
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i_UNSUPPORTED_ERROR_BIT = 64, /*!< Format not successfully interpreted. */
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/** "NONTRIVIAL_ENDIANNESS" means not big-endian, not little-endian
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* (a channel has bits that are not consecutive in either order). **/
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i_UNSUPPORTED_NONTRIVIAL_ENDIANNESS = i_UNSUPPORTED_ERROR_BIT,
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/** "MULTIPLE_SAMPLE_LOCATIONS" is an error because only single-sample
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* texel blocks (with coordinates 0,0,0,0 for all samples) are supported. **/
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i_UNSUPPORTED_MULTIPLE_SAMPLE_LOCATIONS = i_UNSUPPORTED_ERROR_BIT + 1,
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/** "MULTIPLE_PLANES" is an error because only contiguous data is supported. */
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i_UNSUPPORTED_MULTIPLE_PLANES = i_UNSUPPORTED_ERROR_BIT + 2,
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/** Only channels R, G, B and A are supported. */
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i_UNSUPPORTED_CHANNEL_TYPES = i_UNSUPPORTED_ERROR_BIT + 3,
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/** Only channels with the same flags are supported
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* (e.g. we don't support float red with integer green). */
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i_UNSUPPORTED_MIXED_CHANNELS = i_UNSUPPORTED_ERROR_BIT + 4
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};
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/** @brief Interpretation of a channel from the data format descriptor. */
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typedef struct _InterpretedDFDChannel {
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uint32_t offset; /*!< Offset in bits for packed, bytes for unpacked. */
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uint32_t size; /*!< Size in bits for packed, bytes for unpacked. */
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} InterpretedDFDChannel;
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/* Interpret a Data Format Descriptor. */
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enum InterpretDFDResult interpretDFD(const uint32_t *DFD,
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InterpretedDFDChannel *R,
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InterpretedDFDChannel *G,
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InterpretedDFDChannel *B,
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InterpretedDFDChannel *A,
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uint32_t *wordBytes);
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/* Print a human-readable interpretation of a data format descriptor. */
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void printDFD(uint32_t *DFD);
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/* Get the number of components & component size from a DFD for an
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* unpacked format.
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*/
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void
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getDFDComponentInfoUnpacked(const uint32_t* DFD, uint32_t* numComponents,
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uint32_t* componentByteLength);
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/* Return the number of components described by a DFD. */
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uint32_t getDFDNumComponents(const uint32_t* DFD);
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/* Recreate and return the value of bytesPlane0 as it should be for the data
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* post-inflation from variable-rate compression.
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*/
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void
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recreateBytesPlane0FromSampleInfo(const uint32_t* DFD, uint32_t* bytesPlane0);
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/** @brief Colourspace primaries information.
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*
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* Structure to store the 1931 CIE x,y chromaticities of the red, green, and blue
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* display primaries and the reference white point of a colourspace.
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*/
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typedef struct _Primaries {
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float Rx; /*!< Red x. */
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float Ry; /*!< Red y. */
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float Gx; /*!< Green x. */
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float Gy; /*!< Green y. */
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float Bx; /*!< Blue x. */
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float By; /*!< Blue y. */
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float Wx; /*!< White x. */
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float Wy; /*!< White y. */
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} Primaries;
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khr_df_primaries_e findMapping(Primaries *p, float latitude);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _DFD_H_ */
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