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- cleanup of m_fixed.h.

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With fixed point math barely being used anywhere with the vast majority of calls in the software voxel drawer it makes sense to reduce the function interface to the minimum possible and move the shift value into the function call as an argument.
This commit is contained in:
Christoph Oelckers 2020-11-22 10:25:04 +01:00
commit 58d8ce1a4f
9 changed files with 58 additions and 79 deletions
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10
src/common/utility/cmdlib.h
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@ -90,4 +90,14 @@ struct MD5Context;
void md5Update(FileReader& file, MD5Context& md5, unsigned len);
void uppercopy(char* to, const char* from);
inline void fillshort(void* buff, size_t count, uint16_t clear)
{
int16_t* b2 = (int16_t*)buff;
for (size_t i = 0; i < count; ++i)
{
b2[i] = clear;
}
}
#endif

42
src/common/utility/m_fixed.h
View file

@ -6,48 +6,12 @@
#include "basics.h"
// Modern compilers are smart enough to do these multiplications intelligently.
__forceinline int32_t MulScale14(int32_t a, int32_t b) { return (int32_t)(((int64_t)a * b) >> 14); } // only used by R_DrawVoxel
__forceinline int32_t MulScale30(int32_t a, int32_t b) { return (int32_t)(((int64_t)a * b) >> 30); } // only used once in the node builder
__forceinline int32_t MulScale32(int32_t a, int32_t b) { return (int32_t)(((int64_t)a * b) >> 32); } // only used by R_DrawVoxel
__forceinline uint32_t UMulScale16(uint32_t a, uint32_t b) { return (uint32_t)(((uint64_t)a * b) >> 16); } // used for sky drawing
__forceinline int32_t DMulScale3(int32_t a, int32_t b, int32_t c, int32_t d) { return (int32_t)(((int64_t)a*b + (int64_t)c*d) >> 3); } // used for setting up slopes for Build maps
__forceinline int32_t DMulScale6(int32_t a, int32_t b, int32_t c, int32_t d) { return (int32_t)(((int64_t)a*b + (int64_t)c*d) >> 6); } // only used by R_DrawVoxel
__forceinline int32_t DMulScale10(int32_t a, int32_t b, int32_t c, int32_t d) { return (int32_t)(((int64_t)a*b + (int64_t)c*d) >> 10); } // only used by R_DrawVoxel
__forceinline int32_t DMulScale18(int32_t a, int32_t b, int32_t c, int32_t d) { return (int32_t)(((int64_t)a*b + (int64_t)c*d) >> 18); } // only used by R_DrawVoxel
__forceinline int32_t DMulScale32(int32_t a, int32_t b, int32_t c, int32_t d) { return (int32_t)(((int64_t)a*b + (int64_t)c*d) >> 32); } // used by R_PointOnSide.
// Sadly, for divisions this is not true but these are so infrequently used that the C versions are just fine, despite not being fully optimal.
__forceinline int32_t DivScale6(int32_t a, int32_t b) { return (int32_t)(((int64_t)a << 6) / b); } // only used by R_DrawVoxel
__forceinline int32_t DivScale21(int32_t a, int32_t b) { return (int32_t)(((int64_t)a << 21) / b); } // only used by R_DrawVoxel
__forceinline int32_t DivScale30(int32_t a, int32_t b) { return (int32_t)(((int64_t)a << 30) / b); } // only used once in the node builder
__forceinline void fillshort(void *buff, unsigned int count, uint16_t clear)
{
int16_t *b2 = (int16_t *)buff;
for (unsigned int i = 0; i != count; ++i)
{
b2[i] = clear;
}
}
__forceinline constexpr int32_t MulScale(int32_t a, int32_t b, int32_t shift) { return (int32_t)(((int64_t)a * b) >> shift); }
__forceinline constexpr int32_t DMulScale(int32_t a, int32_t b, int32_t c, int32_t d, int32_t shift) { return (int32_t)(((int64_t)a * b + (int64_t)c * d) >> shift); }
__forceinline constexpr int32_t DivScale(int32_t a, int32_t b, int shift) { return (int32_t)(((int64_t)a << shift) / b); }
#include "xs_Float.h"
inline int32_t FixedDiv (int32_t a, int32_t b)
{
if ((uint32_t)abs(a) >> (31-16) >= (uint32_t)abs (b))
return (a^b)<0 ? FIXED_MIN : FIXED_MAX;
return (int32_t)(((int64_t)a << 16) / b);
}
__forceinline constexpr int32_t FixedMul(int32_t a, int32_t b)
{
return (int32_t)(((int64_t)a * b) >> 16);
}
inline fixed_t FloatToFixed(double f)
{
return xs_Fix<16>::ToFix(f);