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Data Structures |
| struct | POINT32 |
| | 2D Point struct More...
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| struct | RECT32 |
| | Rectangle struct. More...
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| struct | VECTOR |
| | Vector struct. More...
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core math macros |
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#define | ABS(x) ( (x)>=0 ? (x) : -(x) ) |
| | Get the absolute value of x.
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#define | SGN(x) ( (x)>=0 ? 1 : -1 ) |
| | Get the sign of x.
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#define | SGN2 SGN |
| | Get the absolute value of x.
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#define | SGN3(x) ( (x)>0 ? 1 : ( (x)<0 ? -1 : 0) ) |
| | Tri-state sign: -1 for negative, 0 for 0, +1 for positive.
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#define | MAX(a, b) ( ((a) > (b)) ? (a) : (b) ) |
| | Get the maximum of a and b.
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#define | MIN(a, b) ( ((a) < (b)) ? (a) : (b) ) |
| | Get the minimum of a and b.
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#define | SWAP2(a, b) do { a=(a)-(b); b=(a)+(b); a=(b)-(a); } while(0) |
| | In-place swap.
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#define | SWAP SWAP2 |
| | Get the absolute value of x.
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#define | SWAP3(a, b, tmp) do { (tmp)=(a); (a)=(b); (b)=(tmp); } while(0) |
| | Swaps a and b, using tmp as a temporary.
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INLINE int | sgn (int x) |
| | Get the sign of x.
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INLINE int | sgn3 (int x) |
| | Tri-state sign of x: -1 for negative, 0 for 0, +1 for positive.
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INLINE int | max (int a, int b) |
| | Get the maximum of a and b.
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INLINE int | min (int a, int b) |
| | Get the minimum of a and b.
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Boundary response macros |
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#define | IN_RANGE(x, min, max) ( ((x)>=(min)) && ((x)<(max)) ) |
| | Range check.
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| #define | CLAMP(x, min, max) ( (x)>=(max) ? ((max)-1) : ( ((x)<(min)) ? (min) : (x) ) ) |
| | Truncates x to stay in range [min, max>.
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| #define | REFLECT(x, min, max) ( (x)>=(max) ? 2*((max)-1)-(x) : ( ((x)<(min)) ? 2*(min)-(x) : (x) ) ) |
| | Reflects x at boundaries min and max.
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#define | WRAP(x, min, max) ( (x)>=(max) ? (x)+(min)-(max) : ( ((x)<(min)) ? (x)+(max)-(min) : (x) ) ) |
| | Wraps x to stay in range [min, max>.
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INLINE BOOL | in_range (int x, int min, int max) |
| | Range check.
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| INLINE int | clamp (int x, int min, int max) |
| | Truncates x to stay in range [min, max>.
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| INLINE int | reflect (int x, int min, int max) |
| | Reflects x at boundaries min and max.
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INLINE int | wrap (int x, int min, int max) |
| | Wraps x to stay in range [min, max>.
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Defines |
| #define | FIX_SHIFT 8 |
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#define | FIX_SCALE ( 1<<FIX_SHIFT ) |
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#define | FIX_MASK ( FIX_SCALE-1 ) |
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#define | FIX_SCALEF ( (float)FIX_SCALE ) |
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#define | FIX_SCALEF_INV ( 1.0/FIX_SCALEF ) |
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#define | FIX_ONE FIX_SCALE |
| #define | FX_RECIPROCAL(a, fp) ( ((1<<(fp))+(a)-1)/(a) ) |
| | Get the fixed point reciprocal of a, in fp fractional bits.
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| #define | FX_RECIMUL(x, a, fp) ( ((x)*((1<<(fp))+(a)-1)/(a))>>(fp) ) |
| | Perform the division x/ a by reciprocal multiplication.
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| #define | SIN_LUT_SIZE 514 |
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#define | DIV_LUT_SIZE 257 |
Functions |
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INLINE FIXED | int2fx (int d) |
| | Convert an integer to fixed-point.
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INLINE FIXED | float2fx (float f) |
| | Convert a float to fixed-point.
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INLINE u32 | fx2uint (FIXED fx) |
| | Convert a FIXED point value to an unsigned integer (orly?).
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INLINE u32 | fx2ufrac (FIXED fx) |
| | Get the unsigned fractional part of a fixed point value (orly?).
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INLINE int | fx2int (FIXED fx) |
| | Convert a FIXED point value to an signed integer.
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INLINE float | fx2float (FIXED fx) |
| | Convert a fixed point value to floating point.
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INLINE FIXED | fxadd (FIXED fa, FIXED fb) |
| | Add two fixed point values.
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INLINE FIXED | fxsub (FIXED fa, FIXED fb) |
| | Subtract two fixed point values.
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INLINE FIXED | fxmul (FIXED fa, FIXED fb) |
| | Multiply two fixed point values.
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INLINE FIXED | fxdiv (FIXED fa, FIXED fb) |
| | Divide two fixed point values.
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INLINE FIXED | fxmul64 (FIXED fa, FIXED fb) |
| | Multiply two fixed point values using 64bit math.
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INLINE FIXED | fxdiv64 (FIXED fa, FIXED fb) |
| | Divide two fixed point values using 64bit math.
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| INLINE s32 | lu_sin (uint theta) |
| | Look-up a sine value (2π = 0x10000).
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| INLINE s32 | lu_cos (uint theta) |
| | Look-up a cosine value (2π = 0x10000).
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| INLINE uint | lu_div (uint x) |
| | Look-up a division value between 0 and 255.
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| INLINE int | lu_lerp32 (const s32 lut[], uint x, const uint shift) |
| | Linear interpolator for 32bit LUTs.
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INLINE int | lu_lerp16 (const s16 lut[], uint x, const uint shift) |
| | As lu_lerp32, but for 16bit LUTs.
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INLINE POINT * | pt_set (POINT *pd, int x, int y) |
| | Initialize pd to (x, y).
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INLINE POINT * | pt_add (POINT *pd, const POINT *pa, const POINT *pb) |
| | Point addition: pd = pa + pb.
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INLINE POINT * | pt_sub (POINT *pd, const POINT *pa, const POINT *pb) |
| | Point subtraction: pd = pa - pb.
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INLINE POINT * | pt_scale (POINT *pd, const POINT *pa, int c) |
| | Point scale: pd = c * pa.
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INLINE POINT * | pt_add_eq (POINT *pd, const POINT *pb) |
| | Point increment: pd += pb.
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INLINE POINT * | pt_sub_eq (POINT *pd, const POINT *pb) |
| | Point decrement: pd -= pb.
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INLINE POINT * | pt_scale_eq (POINT *pd, int c) |
| | Point scale: pd *= c.
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| INLINE int | pt_cross (const POINT *pa, const POINT *pb) |
| | Point 'cross'-product: pa × pb.
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INLINE int | pt_dot (const POINT *pa, const POINT *pb) |
| | Point 'dot'-product:pa · pb.
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int | pt_in_rect (const POINT *pt, const struct RECT *rc) |
| INLINE RECT * | rc_set (RECT *rc, int l, int t, int r, int b) |
| | Initialize a rectangle.
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| INLINE RECT * | rc_set2 (RECT *rc, int x, int y, int w, int h) |
| | Initialize a rectangle, with sizes inside of max boundaries.
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INLINE int | rc_width (const RECT *rc) |
| | Get rectangle width.
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INLINE int | rc_height (const RECT *rc) |
| | Get rectangle height.
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INLINE RECT * | rc_set_pos (RECT *rc, int x, int y) |
| | Move rectangle to (x, y) position.
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INLINE RECT * | rc_set_size (RECT *rc, int w, int h) |
| | Reside rectangle.
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INLINE RECT * | rc_move (RECT *rc, int dx, int dy) |
| | Move rectangle by (dx, dy).
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INLINE RECT * | rc_inflate (RECT *rc, int dw, int dh) |
| | Increase size by dw horizontally and dh vertically.
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INLINE RECT * | rc_inflate2 (RECT *rc, const RECT *dr) |
| | Increase sizes on all sides by values of rectangle dr.
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RECT * | rc_normalize (RECT *rc) |
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INLINE VECTOR * | vec_set (VECTOR *vd, FIXED x, FIXED y, FIXED z) |
| | Initialize a vector.
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INLINE VECTOR * | vec_add (VECTOR *vd, const VECTOR *va, const VECTOR *vb) |
| | Add vectors: d = a + b;.
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INLINE VECTOR * | vec_sub (VECTOR *vd, const VECTOR *va, const VECTOR *vb) |
| | Subtract vectors: d = a - b;.
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INLINE VECTOR * | vec_mul (VECTOR *vd, const VECTOR *va, const VECTOR *vb) |
| | Multiply vectors elements: d = S(ax, ay, az) ·b.
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INLINE VECTOR * | vec_scale (VECTOR *vd, const VECTOR *va, FIXED c) |
| | Scale vector: d = c*a.
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INLINE FIXED | vec_dot (const VECTOR *va, const VECTOR *vb) |
| | Dot-product: d = a ·b.
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INLINE VECTOR * | vec_add_eq (VECTOR *vd, const VECTOR *vb) |
| | Increment vector: d += b;.
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INLINE VECTOR * | vec_sub_eq (VECTOR *vd, const VECTOR *vb) |
| | Decrease vector: d -= b;.
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INLINE VECTOR * | vec_mul_eq (VECTOR *vd, const VECTOR *vb) |
| | Multiply vectors elements: d = S(dx, dy, dz) ·b.
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INLINE VECTOR * | vec_scale_eq (VECTOR *vd, FIXED c) |
| | Scale vector: d = c*d.
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VECTOR * | vec_cross (VECTOR *vd, const VECTOR *va, const VECTOR *vb) |
Variables |
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s32 | div_lut [257] |
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s16 | sin_lut [514] |
