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