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Don't clobber refcounting in SDL_Init.
- Fixes bug 1712 by not overwriting SDL_SubsystemRefCount in SDL_Init.
- Removes the SDL_initialized variable, and makes SDL_SubsystemRefCount
the canonical source of truth for whether or not a subsystem has been
initialized.
- Refactors SDL_InitSubSystem and SDL_QuitSubSystem to use helper
functions to manage refcount.
- Adds automated tests for SDL_Init/Quit*.
- Adds SDL_bits.h which contains SDL_MostSignificantBitIndex.- Loading branch information
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| /* | ||
| Simple DirectMedia Layer | ||
| Copyright (C) 1997-2013 Sam Lantinga <[email protected]> | ||
| This software is provided 'as-is', without any express or implied | ||
| warranty. In no event will the authors be held liable for any damages | ||
| arising from the use of this software. | ||
| Permission is granted to anyone to use this software for any purpose, | ||
| including commercial applications, and to alter it and redistribute it | ||
| freely, subject to the following restrictions: | ||
| 1. The origin of this software must not be misrepresented; you must not | ||
| claim that you wrote the original software. If you use this software | ||
| in a product, an acknowledgment in the product documentation would be | ||
| appreciated but is not required. | ||
| 2. Altered source versions must be plainly marked as such, and must not be | ||
| misrepresented as being the original software. | ||
| 3. This notice may not be removed or altered from any source distribution. | ||
| */ | ||
|
|
||
| /** | ||
| * \file SDL_bits.h | ||
| * | ||
| * Functions for fiddling with bits and bitmasks. | ||
| */ | ||
|
|
||
| #ifndef _SDL_bits_h | ||
| #define _SDL_bits_h | ||
|
|
||
| #include "SDL_stdinc.h" | ||
|
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| #include "begin_code.h" | ||
| /* Set up for C function definitions, even when using C++ */ | ||
| #ifdef __cplusplus | ||
| /* *INDENT-OFF* */ | ||
| extern "C" { | ||
| /* *INDENT-ON* */ | ||
| #endif | ||
|
|
||
| /** | ||
| * \file SDL_bits.h | ||
| * | ||
| * Uses inline functions for compilers that support them, and static | ||
| * functions for those that do not. Because these functions become | ||
| * static for compilers that do not support inline functions, this | ||
| * header should only be included in files that actually use them. | ||
| */ | ||
|
|
||
| /** | ||
| * Get the index of the most significant bit. Result is undefined when called | ||
| * with 0. This operation can also be stated as "count leading zeroes" and | ||
| * "log base 2". | ||
| * | ||
| * \return Index of the most significant bit. | ||
| */ | ||
| static __inline__ Sint8 | ||
| SDL_MostSignificantBitIndex32(Uint32 x) | ||
| { | ||
| #if defined(__GNUC__) | ||
| /* Count Leading Zeroes builtin in GCC. | ||
| * http://gcc.gnu.org/onlinedocs/gcc-4.3.4/gcc/Other-Builtins.html | ||
| */ | ||
| return 31 - __builtin_clz(x); | ||
| #else | ||
| /* Based off of Bit Twiddling Hacks by Sean Eron Anderson | ||
| * <[email protected]>, released in the public domain. | ||
| * http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogLookup | ||
| */ | ||
| static const Sint8 LogTable256[256] = | ||
| { | ||
| #define LT(n) n, n, n, n, n, n, n, n, n, n, n, n, n, n, n, n | ||
| -1, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, | ||
| LT(4), LT(5), LT(5), LT(6), LT(6), LT(6), LT(6), | ||
| LT(7), LT(7), LT(7), LT(7), LT(7), LT(7), LT(7), LT(7) | ||
| #undef LT | ||
| }; | ||
|
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||
| register unsigned int t, tt; | ||
|
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||
| if (tt = x >> 16) | ||
| { | ||
| return ((t = tt >> 8) ? 24 + LogTable256[t] : 16 + LogTable256[tt]); | ||
| } | ||
| else | ||
| { | ||
| return ((t = x >> 8) ? 8 + LogTable256[t] : LogTable256[x]); | ||
| } | ||
| #endif | ||
| } | ||
|
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||
| /* Ends C function definitions when using C++ */ | ||
| #ifdef __cplusplus | ||
| /* *INDENT-OFF* */ | ||
| } | ||
| /* *INDENT-ON* */ | ||
| #endif | ||
| #include "close_code.h" | ||
|
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||
| #endif /* _SDL_bits_h */ | ||
|
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| /* vi: set ts=4 sw=4 expandtab: */ |
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