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Optimizer IM_FIXNORMAL2F.

This commit is contained in:
Bartosz Taudul 2021-05-01 17:30:34 +02:00
parent 630615c6c2
commit 0bd6479f85
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GPG Key ID: B7FE2008B7575DF3
2 changed files with 7 additions and 1 deletions
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2
imgui/imgui_draw.cpp
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@ -695,7 +695,7 @@ void ImDrawList::PrimQuadUV(const ImVec2& a, const ImVec2& b, const ImVec2& c, c
// On AddPolyline() and AddConvexPolyFilled() we intentionally avoid using ImVec2 and superfluous function calls to optimize debug/non-inlined builds.
// Those macros expects l-values.
#define IM_NORMALIZE2F_OVER_ZERO(VX,VY) do { float d2 = VX*VX + VY*VY; if (d2 > 0.0f) { float inv_len = ImRsqrt(d2); VX *= inv_len; VY *= inv_len; } } while (0)
#define IM_FIXNORMAL2F(VX,VY) do { float d2 = VX*VX + VY*VY; if (d2 < 0.5f) d2 = 0.5f; float inv_lensq = 1.0f / d2; VX *= inv_lensq; VY *= inv_lensq; } while (0)
#define IM_FIXNORMAL2F(VX,VY) do { float d2 = VX*VX + VY*VY; if (d2 < 0.5f) d2 = 0.5f; float inv_lensq = ImRecip(d2); VX *= inv_lensq; VY *= inv_lensq; } while (0)
// TODO: Thickness anti-aliased lines cap are missing their AA fringe.
// We avoid using the ImVec2 math operators here to reduce cost to a minimum for debug/non-inlined builds.

6
imgui/imgui_internal.h
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@ -396,6 +396,12 @@ static inline float ImRsqrt(float x) { return _mm_cvtss_f32(_mm_rsqrt
static inline float ImRsqrt(float x) { return 1.0f / sqrtf(x); }
#endif
static inline double ImRsqrt(double x) { return 1.0 / sqrt(x); }
#if defined __SSE__ || defined __x86_64__ || defined _M_X64
static inline float ImRecip(float x) { return _mm_cvtss_f32(_mm_rcp_ps(_mm_set_ss(x))); }
#else
static inline float ImRecip(float x) { return 1.0f / x; }
#endif
static inline double ImRecip(double x) { return 1.0 / x; }
#endif
// - ImMin/ImMax/ImClamp/ImLerp/ImSwap are used by widgets which support variety of types: signed/unsigned int/long long float/double
// (Exceptionally using templates here but we could also redefine them for those types)