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(SDK) Document retro_endianness.h/retro_miscellaneous.h

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This commit is contained in:
twinaphex 2015-01-08 19:46:08 +01:00
parent 2779298371
commit 4e17e365fa
2 changed files with 82 additions and 6 deletions
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60
libretro-sdk/include/retro_endianness.h
View File

@ -38,6 +38,14 @@
(((uint32_t)(x) & 0xff000000) >> 24) \
))
/**
* is_little_endian:
*
* Checks if the system is little endian or big-endian.
*
* Returns: greater than 0 if little-endian,
* otherwise big-endian.
**/
static INLINE uint8_t is_little_endian(void)
{
union
@ -50,6 +58,15 @@ static INLINE uint8_t is_little_endian(void)
return u.y[0];
}
/**
* swap_if_big32:
* @val : unsigned 32-bit value
*
* Byteswap unsigned 32-bit value if system is big-endian.
*
* Returns: Byteswapped value in case system is big-endian,
* otherwise returns same value.
**/
static INLINE uint32_t swap_if_big32(uint32_t val)
{
if (is_little_endian())
@ -58,6 +75,15 @@ static INLINE uint32_t swap_if_big32(uint32_t val)
((val << 8) & 0xFF0000) | (val << 24);
}
/**
* swap_if_little32:
* @val : unsigned 32-bit value
*
* Byteswap unsigned 32-bit value if system is little-endian.
*
* Returns: Byteswapped value in case system is little-endian,
* otherwise returns same value.
**/
static INLINE uint32_t swap_if_little32(uint32_t val)
{
if (is_little_endian())
@ -66,6 +92,15 @@ static INLINE uint32_t swap_if_little32(uint32_t val)
return val;
}
/**
* swap_if_big16:
* @val : unsigned 16-bit value
*
* Byteswap unsigned 16-bit value if system is big-endian.
*
* Returns: Byteswapped value in case system is big-endian,
* otherwise returns same value.
**/
static INLINE uint16_t swap_if_big16(uint16_t val)
{
if (is_little_endian())
@ -73,6 +108,15 @@ static INLINE uint16_t swap_if_big16(uint16_t val)
return (val >> 8) | (val << 8);
}
/**
* swap_if_little16:
* @val : unsigned 16-bit value
*
* Byteswap unsigned 16-bit value if system is little-endian.
*
* Returns: Byteswapped value in case system is little-endian,
* otherwise returns same value.
**/
static INLINE uint16_t swap_if_little16(uint16_t val)
{
if (is_little_endian())
@ -80,11 +124,27 @@ static INLINE uint16_t swap_if_little16(uint16_t val)
return val;
}
/**
* store32be:
* @addr : pointer to unsigned 32-bit buffer
* @data : unsigned 32-bit value to write
*
* Write data to address. Endian-safe. Byteswaps the data
* first if necessary before storing it.
**/
static INLINE void store32be(uint32_t *addr, uint32_t data)
{
*addr = is_little_endian() ? SWAP32(data) : data;
}
/**
* load32be:
* @addr : pointer to unsigned 32-bit buffer
*
* Load value from address. Endian-safe.
*
* Returns: value from address, byte-swapped if necessary.
**/
static INLINE uint32_t load32be(const uint32_t *addr)
{
return is_little_endian() ? SWAP32(*addr) : *addr;

28
libretro-sdk/include/retro_miscellaneous.h
View File

@ -51,12 +51,6 @@
#include <retro_endianness.h>
#include <limits.h>
/* Some platforms do not set this value.
* Just assume a value. It's usually 4KiB.
* Platforms with a known value (like Win32)
* set this value explicitly in platform specific headers.
*/
#ifndef PATH_MAX_LENGTH
#define PATH_MAX_LENGTH 4096
#endif
@ -81,6 +75,12 @@
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
#define RARCH_SCALE_BASE 256
/**
* rarch_sleep:
* @msec : amount in milliseconds to sleep
*
* Sleeps for a specified amount of milliseconds (@msec).
**/
static INLINE void rarch_sleep(unsigned msec)
{
#if defined(__CELLOS_LV2__) && !defined(__PSL1GHT__)
@ -101,6 +101,14 @@ static INLINE void rarch_sleep(unsigned msec)
#endif
}
/**
* next_pow2:
* @v : initial value
*
* Increase initial value to next power of 2 value.
*
* Returns: next power of 2 value (derived from @v).
**/
static INLINE uint32_t next_pow2(uint32_t v)
{
v--;
@ -113,6 +121,14 @@ static INLINE uint32_t next_pow2(uint32_t v)
return v;
}
/**
* prev_pow2:
* @v : initial value
*
* Increase initial value to previous power of 2 value.
*
* Returns: previous power of 2 value (derived from @v).
**/
static INLINE uint32_t prev_pow2(uint32_t v)
{
v |= v >> 1;