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Use faster sqrt() for xBRZ for XP builds 

Use the `sqrt()` introduced in 615e5863 (Add fast-inverse SSE1 sqrt()
from Quake 3 Arena, 2025-01-12) or the xBRZ filters for Windows XP 32
bit builds.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>
This commit is contained in:
Rafael Kitover 2025-01-12 15:46:35 +00:00
parent d36f80b5e6
commit d18c6f115f
No known key found for this signature in database
GPG Key ID: 08AB596679D86240
2 changed files with 16 additions and 1 deletions
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9
src/components/filters/CMakeLists.txt
View File

@ -1,5 +1,13 @@
add_library(vbam-components-filters OBJECT)
unset(extra_src)
if(WINXP)
list(APPEND extra_src
${CMAKE_SOURCE_DIR}/third_party/quake3-sqrt/quake3-sqrt.h
)
target_include_directories(vbam-components-filters PRIVATE ${CMAKE_SOURCE_DIR}/third_party/quake3-sqrt)
endif()
target_sources(vbam-components-filters
PRIVATE
internal/2xSaI.cpp
@ -17,6 +25,7 @@ target_sources(vbam-components-filters
internal/xBRZ/xbrz_config.h
internal/xBRZ/xbrz_tools.h
internal/xbrzfilter.cpp
${extra_src}
PUBLIC
filters.h

8
src/components/filters/internal/xBRZ/xbrz.cpp
View File

@ -21,6 +21,10 @@
#include <cmath> //std::sqrt
#include "xbrz_tools.h"
#ifdef WINXP
#include "quake3-sqrt.h"
#endif
// some gcc versions lie about having this C++17 feature
#define static_assert(x) static_assert(x, "assertion failed")
@ -66,7 +70,9 @@ uint32_t gradientARGB(uint32_t pixFront, uint32_t pixBack) //find intermediate c
inline double fastSqrt(double n)
{
#if (defined(__GNUC__) || defined(__clang__)) && (defined(__x86_64__) || defined(__i386__))
#ifdef WINXP
return quake3_sqrt((float)n);
#elif (defined(__GNUC__) || defined(__clang__)) && (defined(__x86_64__) || defined(__i386__))
__asm__ ("fsqrt" : "+t" (n));
return n;
#elif defined(_MSC_VER) && defined(_M_IX86)