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| /* |
| * Mesa 3-D graphics library |
| * |
| * Copyright (C) 1999-2008 Brian Paul 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. |
| */ |
| |
| |
| /** |
| * \file imports.h |
| * Standard C library function wrappers. |
| * |
| * This file provides wrappers for all the standard C library functions |
| * like malloc(), free(), printf(), getenv(), etc. |
| */ |
| |
| |
| #ifndef IMPORTS_H |
| #define IMPORTS_H |
| |
| |
| #include <stdlib.h> |
| #include <stdarg.h> |
| #include <string.h> |
| #include "compiler.h" |
| #include "glheader.h" |
| #include "errors.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| |
| /**********************************************************************/ |
| /** Memory macros */ |
| /*@{*/ |
| |
| /** Allocate a structure of type \p T */ |
| #define MALLOC_STRUCT(T) (struct T *) malloc(sizeof(struct T)) |
| /** Allocate and zero a structure of type \p T */ |
| #define CALLOC_STRUCT(T) (struct T *) calloc(1, sizeof(struct T)) |
| |
| /*@}*/ |
| |
| |
| /* |
| * For GL_ARB_vertex_buffer_object we need to treat vertex array pointers |
| * as offsets into buffer stores. Since the vertex array pointer and |
| * buffer store pointer are both pointers and we need to add them, we use |
| * this macro. |
| * Both pointers/offsets are expressed in bytes. |
| */ |
| #define ADD_POINTERS(A, B) ( (GLubyte *) (A) + (uintptr_t) (B) ) |
| |
| |
| /** |
| * Sometimes we treat GLfloats as GLints. On x86 systems, moving a float |
| * as a int (thereby using integer registers instead of FP registers) is |
| * a performance win. Typically, this can be done with ordinary casts. |
| * But with gcc's -fstrict-aliasing flag (which defaults to on in gcc 3.0) |
| * these casts generate warnings. |
| * The following union typedef is used to solve that. |
| */ |
| typedef union { GLfloat f; GLint i; GLuint u; } fi_type; |
| |
| |
| |
| #if defined(_MSC_VER) |
| #if _MSC_VER < 1800 /* Not req'd on VS2013 and above */ |
| #define strtoll(p, e, b) _strtoi64(p, e, b) |
| #endif /* _MSC_VER < 1800 */ |
| #define strcasecmp(s1, s2) _stricmp(s1, s2) |
| #endif |
| /*@}*/ |
| |
| |
| /*** |
| *** LOG2: Log base 2 of float |
| ***/ |
| static inline GLfloat LOG2(GLfloat x) |
| { |
| #if 0 |
| /* This is pretty fast, but not accurate enough (only 2 fractional bits). |
| * Based on code from http://www.stereopsis.com/log2.html |
| */ |
| const GLfloat y = x * x * x * x; |
| const GLuint ix = *((GLuint *) &y); |
| const GLuint exp = (ix >> 23) & 0xFF; |
| const GLint log2 = ((GLint) exp) - 127; |
| return (GLfloat) log2 * (1.0 / 4.0); /* 4, because of x^4 above */ |
| #endif |
| /* Pretty fast, and accurate. |
| * Based on code from http://www.flipcode.com/totd/ |
| */ |
| fi_type num; |
| GLint log_2; |
| num.f = x; |
| log_2 = ((num.i >> 23) & 255) - 128; |
| num.i &= ~(255 << 23); |
| num.i += 127 << 23; |
| num.f = ((-1.0f/3) * num.f + 2) * num.f - 2.0f/3; |
| return num.f + log_2; |
| } |
| |
| |
| |
| /** |
| * finite macro. |
| */ |
| #if defined(_MSC_VER) |
| # define finite _finite |
| #endif |
| |
| |
| /*** |
| *** IS_INF_OR_NAN: test if float is infinite or NaN |
| ***/ |
| #if defined(isfinite) |
| #define IS_INF_OR_NAN(x) (!isfinite(x)) |
| #elif defined(finite) |
| #define IS_INF_OR_NAN(x) (!finite(x)) |
| #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L |
| #define IS_INF_OR_NAN(x) (!isfinite(x)) |
| #else |
| #define IS_INF_OR_NAN(x) (!finite(x)) |
| #endif |
| |
| |
| /** |
| * Convert float to int by rounding to nearest integer, away from zero. |
| */ |
| static inline int IROUND(float f) |
| { |
| return (int) ((f >= 0.0F) ? (f + 0.5F) : (f - 0.5F)); |
| } |
| |
| |
| /** |
| * Convert float to int64 by rounding to nearest integer. |
| */ |
| static inline GLint64 IROUND64(float f) |
| { |
| return (GLint64) ((f >= 0.0F) ? (f + 0.5F) : (f - 0.5F)); |
| } |
| |
| |
| /** |
| * Convert positive float to int by rounding to nearest integer. |
| */ |
| static inline int IROUND_POS(float f) |
| { |
| assert(f >= 0.0F); |
| return (int) (f + 0.5F); |
| } |
| |
| #ifdef __x86_64__ |
| # include <xmmintrin.h> |
| #endif |
| |
| /** |
| * Convert float to int using a fast method. The rounding mode may vary. |
| */ |
| static inline int F_TO_I(float f) |
| { |
| #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__) |
| int r; |
| __asm__ ("fistpl %0" : "=m" (r) : "t" (f) : "st"); |
| return r; |
| #elif defined(USE_X86_ASM) && defined(_MSC_VER) |
| int r; |
| _asm { |
| fld f |
| fistp r |
| } |
| return r; |
| #elif defined(__x86_64__) |
| return _mm_cvt_ss2si(_mm_load_ss(&f)); |
| #else |
| return IROUND(f); |
| #endif |
| } |
| |
| |
| /** Return (as an integer) floor of float */ |
| static inline int IFLOOR(float f) |
| { |
| #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__) |
| /* |
| * IEEE floor for computers that round to nearest or even. |
| * 'f' must be between -4194304 and 4194303. |
| * This floor operation is done by "(iround(f + .5) + iround(f - .5)) >> 1", |
| * but uses some IEEE specific tricks for better speed. |
| * Contributed by Josh Vanderhoof |
| */ |
| int ai, bi; |
| double af, bf; |
| af = (3 << 22) + 0.5 + (double)f; |
| bf = (3 << 22) + 0.5 - (double)f; |
| /* GCC generates an extra fstp/fld without this. */ |
| __asm__ ("fstps %0" : "=m" (ai) : "t" (af) : "st"); |
| __asm__ ("fstps %0" : "=m" (bi) : "t" (bf) : "st"); |
| return (ai - bi) >> 1; |
| #else |
| int ai, bi; |
| double af, bf; |
| fi_type u; |
| af = (3 << 22) + 0.5 + (double)f; |
| bf = (3 << 22) + 0.5 - (double)f; |
| u.f = (float) af; ai = u.i; |
| u.f = (float) bf; bi = u.i; |
| return (ai - bi) >> 1; |
| #endif |
| } |
| |
| |
| /** Return (as an integer) ceiling of float */ |
| static inline int ICEIL(float f) |
| { |
| #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__) |
| /* |
| * IEEE ceil for computers that round to nearest or even. |
| * 'f' must be between -4194304 and 4194303. |
| * This ceil operation is done by "(iround(f + .5) + iround(f - .5) + 1) >> 1", |
| * but uses some IEEE specific tricks for better speed. |
| * Contributed by Josh Vanderhoof |
| */ |
| int ai, bi; |
| double af, bf; |
| af = (3 << 22) + 0.5 + (double)f; |
| bf = (3 << 22) + 0.5 - (double)f; |
| /* GCC generates an extra fstp/fld without this. */ |
| __asm__ ("fstps %0" : "=m" (ai) : "t" (af) : "st"); |
| __asm__ ("fstps %0" : "=m" (bi) : "t" (bf) : "st"); |
| return (ai - bi + 1) >> 1; |
| #else |
| int ai, bi; |
| double af, bf; |
| fi_type u; |
| af = (3 << 22) + 0.5 + (double)f; |
| bf = (3 << 22) + 0.5 - (double)f; |
| u.f = (float) af; ai = u.i; |
| u.f = (float) bf; bi = u.i; |
| return (ai - bi + 1) >> 1; |
| #endif |
| } |
| |
| |
| /** |
| * Is x a power of two? |
| */ |
| static inline int |
| _mesa_is_pow_two(int x) |
| { |
| return !(x & (x - 1)); |
| } |
| |
| /** |
| * Round given integer to next higer power of two |
| * If X is zero result is undefined. |
| * |
| * Source for the fallback implementation is |
| * Sean Eron Anderson's webpage "Bit Twiddling Hacks" |
| * http://graphics.stanford.edu/~seander/bithacks.html |
| * |
| * When using builtin function have to do some work |
| * for case when passed values 1 to prevent hiting |
| * undefined result from __builtin_clz. Undefined |
| * results would be different depending on optimization |
| * level used for build. |
| */ |
| static inline int32_t |
| _mesa_next_pow_two_32(uint32_t x) |
| { |
| #ifdef HAVE___BUILTIN_CLZ |
| uint32_t y = (x != 1); |
| return (1 + y) << ((__builtin_clz(x - y) ^ 31) ); |
| #else |
| x--; |
| x |= x >> 1; |
| x |= x >> 2; |
| x |= x >> 4; |
| x |= x >> 8; |
| x |= x >> 16; |
| x++; |
| return x; |
| #endif |
| } |
| |
| static inline int64_t |
| _mesa_next_pow_two_64(uint64_t x) |
| { |
| #ifdef HAVE___BUILTIN_CLZLL |
| uint64_t y = (x != 1); |
| STATIC_ASSERT(sizeof(x) == sizeof(long long)); |
| return (1 + y) << ((__builtin_clzll(x - y) ^ 63)); |
| #else |
| x--; |
| x |= x >> 1; |
| x |= x >> 2; |
| x |= x >> 4; |
| x |= x >> 8; |
| x |= x >> 16; |
| x |= x >> 32; |
| x++; |
| return x; |
| #endif |
| } |
| |
| |
| /* |
| * Returns the floor form of binary logarithm for a 32-bit integer. |
| */ |
| static inline GLuint |
| _mesa_logbase2(GLuint n) |
| { |
| #ifdef HAVE___BUILTIN_CLZ |
| return (31 - __builtin_clz(n | 1)); |
| #else |
| GLuint pos = 0; |
| if (n >= 1<<16) { n >>= 16; pos += 16; } |
| if (n >= 1<< 8) { n >>= 8; pos += 8; } |
| if (n >= 1<< 4) { n >>= 4; pos += 4; } |
| if (n >= 1<< 2) { n >>= 2; pos += 2; } |
| if (n >= 1<< 1) { pos += 1; } |
| return pos; |
| #endif |
| } |
| |
| |
| /** |
| * Return 1 if this is a little endian machine, 0 if big endian. |
| */ |
| static inline GLboolean |
| _mesa_little_endian(void) |
| { |
| const GLuint ui = 1; /* intentionally not static */ |
| return *((const GLubyte *) &ui); |
| } |
| |
| |
| |
| /********************************************************************** |
| * Functions |
| */ |
| |
| extern void * |
| _mesa_align_malloc( size_t bytes, unsigned long alignment ); |
| |
| extern void * |
| _mesa_align_calloc( size_t bytes, unsigned long alignment ); |
| |
| extern void |
| _mesa_align_free( void *ptr ); |
| |
| extern void * |
| _mesa_align_realloc(void *oldBuffer, size_t oldSize, size_t newSize, |
| unsigned long alignment); |
| |
| extern void * |
| _mesa_exec_malloc( GLuint size ); |
| |
| extern void |
| _mesa_exec_free( void *addr ); |
| |
| |
| #ifndef FFS_DEFINED |
| #define FFS_DEFINED 1 |
| #ifdef HAVE___BUILTIN_FFS |
| #define ffs __builtin_ffs |
| #else |
| extern int ffs(int i); |
| #endif |
| |
| #ifdef HAVE___BUILTIN_FFSLL |
| #define ffsll __builtin_ffsll |
| #else |
| extern int ffsll(long long int i); |
| #endif |
| #endif /* FFS_DEFINED */ |
| |
| |
| #ifdef HAVE___BUILTIN_POPCOUNT |
| #define _mesa_bitcount(i) __builtin_popcount(i) |
| #else |
| extern unsigned int |
| _mesa_bitcount(unsigned int n); |
| #endif |
| |
| #ifdef HAVE___BUILTIN_POPCOUNTLL |
| #define _mesa_bitcount_64(i) __builtin_popcountll(i) |
| #else |
| extern unsigned int |
| _mesa_bitcount_64(uint64_t n); |
| #endif |
| |
| /** |
| * Find the last (most significant) bit set in a word. |
| * |
| * Essentially ffs() in the reverse direction. |
| */ |
| static inline unsigned int |
| _mesa_fls(unsigned int n) |
| { |
| #ifdef HAVE___BUILTIN_CLZ |
| return n == 0 ? 0 : 32 - __builtin_clz(n); |
| #else |
| unsigned int v = 1; |
| |
| if (n == 0) |
| return 0; |
| |
| while (n >>= 1) |
| v++; |
| |
| return v; |
| #endif |
| } |
| |
| /** |
| * Find the last (most significant) bit set in a uint64_t value. |
| * |
| * Essentially ffsll() in the reverse direction. |
| */ |
| static inline unsigned int |
| _mesa_flsll(uint64_t n) |
| { |
| #ifdef HAVE___BUILTIN_CLZLL |
| return n == 0 ? 0 : 64 - __builtin_clzll(n); |
| #else |
| unsigned int v = 1; |
| |
| if (n == 0) |
| return 0; |
| |
| while (n >>= 1) |
| v++; |
| |
| return v; |
| #endif |
| } |
| |
| |
| extern GLhalfARB |
| _mesa_float_to_half(float f); |
| |
| extern float |
| _mesa_half_to_float(GLhalfARB h); |
| |
| static inline bool |
| _mesa_half_is_negative(GLhalfARB h) |
| { |
| return h & 0x8000; |
| } |
| |
| extern unsigned int |
| _mesa_str_checksum(const char *str); |
| |
| extern int |
| _mesa_snprintf( char *str, size_t size, const char *fmt, ... ) PRINTFLIKE(3, 4); |
| |
| extern int |
| _mesa_vsnprintf(char *str, size_t size, const char *fmt, va_list arg); |
| |
| |
| #if defined(_MSC_VER) && !defined(snprintf) |
| #define snprintf _snprintf |
| #endif |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| |
| #endif /* IMPORTS_H */ |