#include <string.h>
#include "util/compiler.h"
#include "util/bitscan.h"
+#include "util/u_memory.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
/*@}*/
-/***
- *** LOG2: Log base 2 of float
- ***/
-static inline float LOG2(float 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 float y = x * x * x * x;
- const unsigned ix = *((unsigned *) &y);
- const unsigned exp = (ix >> 23) & 0xFF;
- const int log2 = ((int) exp) - 127;
- return (float) 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;
- int 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.
*/
#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 double to int by rounding to nearest integer, away from zero.
- */
-static inline int IROUNDD(double d)
-{
- return (int) ((d >= 0.0) ? (d + 0.5) : (d - 0.5));
-}
-
-/**
- * Convert float to int64 by rounding to nearest integer.
- */
-static inline int64_t IROUND64(float f)
-{
- return (int64_t) ((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);
-}
-
-/** 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
-}
-
-
-/**
- * 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 unsigned
-_mesa_logbase2(unsigned n)
-{
-#ifdef HAVE___BUILTIN_CLZ
- return (31 - __builtin_clz(n | 1));
-#else
- unsigned 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
-}
-
-
/**********************************************************************
* Functions
*/
projects / mesa.git / blobdiff