/
DGLFIXP.H
executable file
·98 lines (76 loc) · 2.4 KB
/
DGLFIXP.H
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#ifndef LIBDGL_DGLFIXP_H
#define LIBDGL_DGLFIXP_H
#include "dglcmn.h"
#include <math.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef int32 fixed;
#define FP_INT_SHIFT 16
#define FP_FLOAT_SHIFT 65536.0f
static fixed fix_sin(fixed x);
static fixed fix_cos(fixed x);
static fixed fix_tan(fixed x);
fixed fix_sqrt(fixed x);
fixed fix_atan2(fixed y, fixed x);
fixed fix_mul(fixed a, fixed b);
#pragma aux fix_mul = \
"imul ebx" \
"shrd eax, edx, 16" \
parm [eax] [ebx] \
modify [eax ebx edx];
fixed fix_div(fixed a, fixed b);
#pragma aux fix_div = \
"cdq" \
"shld edx, eax, 16" \
"sal eax, 16" \
"idiv ebx" \
parm [eax] [ebx] \
modify [eax ebx edx];
#define FTOFIX(f) ((fixed)((f) * FP_FLOAT_SHIFT))
#define ITOFIX(i) ((fixed)((i) << FP_INT_SHIFT))
#define FIXTOF(x) ((float)((x) / FP_FLOAT_SHIFT))
#define FIXTOI(x) ((int32)(((x) + 0x8000) >> FP_INT_SHIFT))
#define FP_1 ITOFIX(1)
#define FP_2 ITOFIX(2)
#define FP_3 ITOFIX(3)
#define FP_4 ITOFIX(4)
#define FP_5 ITOFIX(5)
#define FP_6 ITOFIX(6)
#define FP_7 ITOFIX(7)
#define FP_8 ITOFIX(8)
#define FP_9 ITOFIX(9)
#define FP_10 ITOFIX(10)
#define FP_16 ITOFIX(16)
#define FP_32 ITOFIX(32)
#define FP_64 ITOFIX(64)
#define FP_128 ITOFIX(128)
#define FP_256 ITOFIX(256)
#define FP_0_1 FTOFIX(0.1f)
#define FP_0_2 FTOFIX(0.2f)
#define FP_0_3 FTOFIX(0.3f)
#define FP_0_4 FTOFIX(0.4f)
#define FP_0_5 FTOFIX(0.5f)
#define FP_0_6 FTOFIX(0.6f)
#define FP_0_7 FTOFIX(0.7f)
#define FP_0_8 FTOFIX(0.8f)
#define FP_0_9 FTOFIX(0.9f)
#define FP_0_25 FTOFIX(0.25f)
#define FP_0_75 FTOFIX(0.75f)
#define FP_1_OVER_3 FTOFIX(1.0f / 3.0f)
#define FP_2_OVER_3 FTOFIX(2.0f / 3.0f)
#define FP_PI FTOFIX(3.1415927f)
// ---------------------------------------------------------------------------
static fixed fix_sin(fixed x) {
return FTOFIX(sin(FIXTOF(x)));
}
static fixed fix_cos(fixed x) {
return FTOFIX(cos(FIXTOF(x)));
}
static fixed fix_tan(fixed x) {
return FTOFIX(tan(FIXTOF(x)));
}
#ifdef __cplusplus
}
#endif
#endif