| /** |
| * \file format_utils.h |
| * A collection of format conversion utility functions. |
| */ |
| |
| /* |
| * Mesa 3-D graphics library |
| * |
| * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. |
| * Copyright (C) 2014 Intel Corporation All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included |
| * in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #ifndef FORMAT_UTILS_H |
| #define FORMAT_UTILS_H |
| |
| #include "formats.h" |
| |
| #include "macros.h" |
| #include "util/rounding.h" |
| #include "util/half_float.h" |
| |
| extern const mesa_array_format RGBA32_FLOAT; |
| extern const mesa_array_format RGBA8_UBYTE; |
| extern const mesa_array_format RGBA32_UINT; |
| extern const mesa_array_format RGBA32_INT; |
| |
| /* Only guaranteed to work for BITS <= 32 */ |
| #define MAX_UINT(BITS) ((BITS) == 32 ? UINT32_MAX : ((1u << (BITS)) - 1)) |
| #define MAX_INT(BITS) ((int)MAX_UINT((BITS) - 1)) |
| #define MIN_INT(BITS) ((BITS) == 32 ? INT32_MIN : (-(1 << (BITS - 1)))) |
| |
| /* Extends an integer of size SRC_BITS to one of size DST_BITS linearly */ |
| #define EXTEND_NORMALIZED_INT(X, SRC_BITS, DST_BITS) \ |
| (((X) * (int)(MAX_UINT(DST_BITS) / MAX_UINT(SRC_BITS))) + \ |
| ((DST_BITS % SRC_BITS) ? ((X) >> (SRC_BITS - DST_BITS % SRC_BITS)) : 0)) |
| |
| static inline float |
| _mesa_unorm_to_float(unsigned x, unsigned src_bits) |
| { |
| return x * (1.0f / (float)MAX_UINT(src_bits)); |
| } |
| |
| static inline float |
| _mesa_snorm_to_float(int x, unsigned src_bits) |
| { |
| if (x <= -MAX_INT(src_bits)) |
| return -1.0f; |
| else |
| return x * (1.0f / (float)MAX_INT(src_bits)); |
| } |
| |
| static inline uint16_t |
| _mesa_unorm_to_half(unsigned x, unsigned src_bits) |
| { |
| return _mesa_float_to_half(_mesa_unorm_to_float(x, src_bits)); |
| } |
| |
| static inline uint16_t |
| _mesa_snorm_to_half(int x, unsigned src_bits) |
| { |
| return _mesa_float_to_half(_mesa_snorm_to_float(x, src_bits)); |
| } |
| |
| static inline unsigned |
| _mesa_float_to_unorm(float x, unsigned dst_bits) |
| { |
| if (x < 0.0f) |
| return 0; |
| else if (x > 1.0f) |
| return MAX_UINT(dst_bits); |
| else |
| return _mesa_i64roundevenf(x * MAX_UINT(dst_bits)); |
| } |
| |
| static inline unsigned |
| _mesa_half_to_unorm(uint16_t x, unsigned dst_bits) |
| { |
| return _mesa_float_to_unorm(_mesa_half_to_float(x), dst_bits); |
| } |
| |
| static inline unsigned |
| _mesa_unorm_to_unorm(unsigned x, unsigned src_bits, unsigned dst_bits) |
| { |
| if (src_bits < dst_bits) { |
| return EXTEND_NORMALIZED_INT(x, src_bits, dst_bits); |
| } else if (src_bits > dst_bits) { |
| unsigned src_half = (1 << (src_bits - 1)) - 1; |
| |
| if (src_bits + dst_bits > sizeof(x) * 8) { |
| assert(src_bits + dst_bits <= sizeof(uint64_t) * 8); |
| return (((uint64_t) x * MAX_UINT(dst_bits) + src_half) / |
| MAX_UINT(src_bits)); |
| } else { |
| return (x * MAX_UINT(dst_bits) + src_half) / MAX_UINT(src_bits); |
| } |
| } else { |
| return x; |
| } |
| } |
| |
| static inline unsigned |
| _mesa_snorm_to_unorm(int x, unsigned src_bits, unsigned dst_bits) |
| { |
| if (x < 0) |
| return 0; |
| else |
| return _mesa_unorm_to_unorm(x, src_bits - 1, dst_bits); |
| } |
| |
| static inline int |
| _mesa_float_to_snorm(float x, unsigned dst_bits) |
| { |
| if (x < -1.0f) |
| return -MAX_INT(dst_bits); |
| else if (x > 1.0f) |
| return MAX_INT(dst_bits); |
| else |
| return _mesa_lroundevenf(x * MAX_INT(dst_bits)); |
| } |
| |
| static inline int |
| _mesa_half_to_snorm(uint16_t x, unsigned dst_bits) |
| { |
| return _mesa_float_to_snorm(_mesa_half_to_float(x), dst_bits); |
| } |
| |
| static inline int |
| _mesa_unorm_to_snorm(unsigned x, unsigned src_bits, unsigned dst_bits) |
| { |
| return _mesa_unorm_to_unorm(x, src_bits, dst_bits - 1); |
| } |
| |
| static inline int |
| _mesa_snorm_to_snorm(int x, unsigned src_bits, unsigned dst_bits) |
| { |
| if (x < -MAX_INT(src_bits)) |
| return -MAX_INT(dst_bits); |
| else if (src_bits < dst_bits) |
| return EXTEND_NORMALIZED_INT(x, src_bits - 1, dst_bits - 1); |
| else |
| return x >> (src_bits - dst_bits); |
| } |
| |
| static inline unsigned |
| _mesa_unsigned_to_unsigned(unsigned src, unsigned dst_size) |
| { |
| return MIN2(src, MAX_UINT(dst_size)); |
| } |
| |
| static inline int |
| _mesa_unsigned_to_signed(unsigned src, unsigned dst_size) |
| { |
| return MIN2(src, (unsigned)MAX_INT(dst_size)); |
| } |
| |
| static inline int |
| _mesa_signed_to_signed(int src, unsigned dst_size) |
| { |
| return CLAMP(src, MIN_INT(dst_size), MAX_INT(dst_size)); |
| } |
| |
| static inline unsigned |
| _mesa_signed_to_unsigned(int src, unsigned dst_size) |
| { |
| return CLAMP(src, 0, MAX_UINT(dst_size)); |
| } |
| |
| static inline unsigned |
| _mesa_float_to_unsigned(float src, unsigned dst_bits) |
| { |
| if (src < 0.0f) |
| return 0; |
| if (src > (float)MAX_UINT(dst_bits)) |
| return MAX_UINT(dst_bits); |
| return _mesa_signed_to_unsigned(src, dst_bits); |
| } |
| |
| static inline unsigned |
| _mesa_float_to_signed(float src, unsigned dst_bits) |
| { |
| if (src < (float)(-MAX_INT(dst_bits))) |
| return -MAX_INT(dst_bits); |
| if (src > (float)MAX_INT(dst_bits)) |
| return MAX_INT(dst_bits); |
| return _mesa_signed_to_signed(src, dst_bits); |
| } |
| |
| static inline unsigned |
| _mesa_half_to_unsigned(uint16_t src, unsigned dst_bits) |
| { |
| if (_mesa_half_is_negative(src)) |
| return 0; |
| return _mesa_unsigned_to_unsigned(_mesa_float_to_half(src), dst_bits); |
| } |
| |
| static inline unsigned |
| _mesa_half_to_signed(uint16_t src, unsigned dst_bits) |
| { |
| return _mesa_float_to_signed(_mesa_half_to_float(src), dst_bits); |
| } |
| |
| bool |
| _mesa_format_to_array(mesa_format, GLenum *type, int *num_components, |
| uint8_t swizzle[4], bool *normalized); |
| |
| void |
| _mesa_swizzle_and_convert(void *dst, |
| enum mesa_array_format_datatype dst_type, |
| int num_dst_channels, |
| const void *src, |
| enum mesa_array_format_datatype src_type, |
| int num_src_channels, |
| const uint8_t swizzle[4], bool normalized, int count); |
| |
| bool |
| _mesa_compute_rgba2base2rgba_component_mapping(GLenum baseFormat, uint8_t *map); |
| |
| void |
| _mesa_format_convert(void *void_dst, uint32_t dst_format, size_t dst_stride, |
| void *void_src, uint32_t src_format, size_t src_stride, |
| size_t width, size_t height, uint8_t *rebase_swizzle); |
| |
| #endif |