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Updated bool detection.
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include/SDL_gpu.h
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include/SDL_gpu.h
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#define SDL_GPU_USE_SDL1
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#endif
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// Use bool type if available
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#if defined(_MSC_VER)
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// As of 2016, MSVC still doesn't have bool.
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#include <WinDef.h>
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#define GPU_bool BOOL
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#elif defined(__cplusplus)
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// Check for bool support
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#define GPU_HAVE_C99 (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L))
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#define GPU_HAVE_GNUC defined(__GNUC__) // catches both gcc and clang I believe
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#define GPU_HAVE_MSVC18 (defined(_MSC_VER) && (_MSC_VER >= 1800)) // VS2013+
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#if defined(GPU_USE_REAL_BOOL) && GPU_USE_REAL_BOOL // allow user to specify
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#define GPU_bool bool
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#elif defined(GPU_USE_INT_BOOL) && GPU_USE_INT_BOOL
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#define GPU_bool int
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#elif GPU_HAVE_C99 || GPU_HAVE_GNUC || GPU_HAVE_MSVC18 || (defined(GPU_HAVE_STDBOOL) && GPU_HAVE_STDBOOL)
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#include <stdbool.h>
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#define GPU_bool bool
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#elif __STDC_VERSION__ >= 199901L
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#define GPU_bool _Bool
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#else
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// Fall back to compatibility with MSVC BOOL
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#define GPU_bool int
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#endif
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