summaryrefslogtreecommitdiffstats
path: root/depedencies/include/glm/gtc/round.inl
blob: f583c403573d59e7cd31f4ba5aead966df2ea0bc (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
/// @ref gtc_round
/// @file glm/gtc/round.inl

#include "../detail/func_integer.hpp"

namespace glm{
namespace detail
{
	template <typename T, precision P, template <typename, precision> class vecType, bool compute = false>
	struct compute_ceilShift
	{
		GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> const & v, T)
		{
			return v;
		}
	};

	template <typename T, precision P, template <typename, precision> class vecType>
	struct compute_ceilShift<T, P, vecType, true>
	{
		GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> const & v, T Shift)
		{
			return v | (v >> Shift);
		}
	};

	template <typename T, precision P, template <typename, precision> class vecType, bool isSigned = true>
	struct compute_ceilPowerOfTwo
	{
		GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> const & x)
		{
			GLM_STATIC_ASSERT(!std::numeric_limits<T>::is_iec559, "'ceilPowerOfTwo' only accept integer scalar or vector inputs");

			vecType<T, P> const Sign(sign(x));

			vecType<T, P> v(abs(x));

			v = v - static_cast<T>(1);
			v = v | (v >> static_cast<T>(1));
			v = v | (v >> static_cast<T>(2));
			v = v | (v >> static_cast<T>(4));
			v = compute_ceilShift<T, P, vecType, sizeof(T) >= 2>::call(v, 8);
			v = compute_ceilShift<T, P, vecType, sizeof(T) >= 4>::call(v, 16);
			v = compute_ceilShift<T, P, vecType, sizeof(T) >= 8>::call(v, 32);
			return (v + static_cast<T>(1)) * Sign;
		}
	};

	template <typename T, precision P, template <typename, precision> class vecType>
	struct compute_ceilPowerOfTwo<T, P, vecType, false>
	{
		GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> const & x)
		{
			GLM_STATIC_ASSERT(!std::numeric_limits<T>::is_iec559, "'ceilPowerOfTwo' only accept integer scalar or vector inputs");

			vecType<T, P> v(x);

			v = v - static_cast<T>(1);
			v = v | (v >> static_cast<T>(1));
			v = v | (v >> static_cast<T>(2));
			v = v | (v >> static_cast<T>(4));
			v = compute_ceilShift<T, P, vecType, sizeof(T) >= 2>::call(v, 8);
			v = compute_ceilShift<T, P, vecType, sizeof(T) >= 4>::call(v, 16);
			v = compute_ceilShift<T, P, vecType, sizeof(T) >= 8>::call(v, 32);
			return v + static_cast<T>(1);
		}
	};

	template <bool is_float, bool is_signed>
	struct compute_ceilMultiple{};

	template <>
	struct compute_ceilMultiple<true, true>
	{
		template <typename genType>
		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
		{
			if(Source > genType(0))
				return Source + (Multiple - std::fmod(Source, Multiple));
			else
				return Source + std::fmod(-Source, Multiple);
		}
	};

	template <>
	struct compute_ceilMultiple<false, false>
	{
		template <typename genType>
		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
		{
			genType Tmp = Source - genType(1);
			return Tmp + (Multiple - (Tmp % Multiple));
		}
	};

	template <>
	struct compute_ceilMultiple<false, true>
	{
		template <typename genType>
		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
		{
			if(Source > genType(0))
			{
				genType Tmp = Source - genType(1);
				return Tmp + (Multiple - (Tmp % Multiple));
			}
			else
				return Source + (-Source % Multiple);
		}
	};

	template <bool is_float, bool is_signed>
	struct compute_floorMultiple{};

	template <>
	struct compute_floorMultiple<true, true>
	{
		template <typename genType>
		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
		{
			if(Source >= genType(0))
				return Source - std::fmod(Source, Multiple);
			else
				return Source - std::fmod(Source, Multiple) - Multiple;
		}
	};

	template <>
	struct compute_floorMultiple<false, false>
	{
		template <typename genType>
		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
		{
			if(Source >= genType(0))
				return Source - Source % Multiple;
			else
			{
				genType Tmp = Source + genType(1);
				return Tmp - Tmp % Multiple - Multiple;
			}
		}
	};

	template <>
	struct compute_floorMultiple<false, true>
	{
		template <typename genType>
		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
		{
			if(Source >= genType(0))
				return Source - Source % Multiple;
			else
			{
				genType Tmp = Source + genType(1);
				return Tmp - Tmp % Multiple - Multiple;
			}
		}
	};

	template <bool is_float, bool is_signed>
	struct compute_roundMultiple{};

	template <>
	struct compute_roundMultiple<true, true>
	{
		template <typename genType>
		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
		{
			if(Source >= genType(0))
				return Source - std::fmod(Source, Multiple);
			else
			{
				genType Tmp = Source + genType(1);
				return Tmp - std::fmod(Tmp, Multiple) - Multiple;
			}
		}
	};

	template <>
	struct compute_roundMultiple<false, false>
	{
		template <typename genType>
		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
		{
			if(Source >= genType(0))
				return Source - Source % Multiple;
			else
			{
				genType Tmp = Source + genType(1);
				return Tmp - Tmp % Multiple - Multiple;
			}
		}
	};

	template <>
	struct compute_roundMultiple<false, true>
	{
		template <typename genType>
		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
		{
			if(Source >= genType(0))
				return Source - Source % Multiple;
			else
			{
				genType Tmp = Source + genType(1);
				return Tmp - Tmp % Multiple - Multiple;
			}
		}
	};
}//namespace detail

	////////////////
	// isPowerOfTwo

	template <typename genType>
	GLM_FUNC_QUALIFIER bool isPowerOfTwo(genType Value)
	{
		genType const Result = glm::abs(Value);
		return !(Result & (Result - 1));
	}

	template <typename T, precision P, template <typename, precision> class vecType>
	GLM_FUNC_QUALIFIER vecType<bool, P> isPowerOfTwo(vecType<T, P> const & Value)
	{
		vecType<T, P> const Result(abs(Value));
		return equal(Result & (Result - 1), vecType<T, P>(0));
	}

	//////////////////
	// ceilPowerOfTwo

	template <typename genType>
	GLM_FUNC_QUALIFIER genType ceilPowerOfTwo(genType value)
	{
		return detail::compute_ceilPowerOfTwo<genType, defaultp, tvec1, std::numeric_limits<genType>::is_signed>::call(tvec1<genType, defaultp>(value)).x;
	}

	template <typename T, precision P, template <typename, precision> class vecType>
	GLM_FUNC_QUALIFIER vecType<T, P> ceilPowerOfTwo(vecType<T, P> const & v)
	{
		return detail::compute_ceilPowerOfTwo<T, P, vecType, std::numeric_limits<T>::is_signed>::call(v);
	}

	///////////////////
	// floorPowerOfTwo

	template <typename genType>
	GLM_FUNC_QUALIFIER genType floorPowerOfTwo(genType value)
	{
		return isPowerOfTwo(value) ? value : static_cast<genType>(1) << findMSB(value);
	}

	template <typename T, precision P, template <typename, precision> class vecType>
	GLM_FUNC_QUALIFIER vecType<T, P> floorPowerOfTwo(vecType<T, P> const & v)
	{
		return detail::functor1<T, T, P, vecType>::call(floorPowerOfTwo, v);
	}

	///////////////////
	// roundPowerOfTwo

	template <typename genIUType>
	GLM_FUNC_QUALIFIER genIUType roundPowerOfTwo(genIUType value)
	{
		if(isPowerOfTwo(value))
			return value;

		genIUType const prev = static_cast<genIUType>(1) << findMSB(value);
		genIUType const next = prev << static_cast<genIUType>(1);
		return (next - value) < (value - prev) ? next : prev;
	}

	template <typename T, precision P, template <typename, precision> class vecType>
	GLM_FUNC_QUALIFIER vecType<T, P> roundPowerOfTwo(vecType<T, P> const & v)
	{
		return detail::functor1<T, T, P, vecType>::call(roundPowerOfTwo, v);
	}

	////////////////
	// isMultiple

	template <typename genType>
	GLM_FUNC_QUALIFIER bool isMultiple(genType Value, genType Multiple)
	{
		return isMultiple(tvec1<genType>(Value), tvec1<genType>(Multiple)).x;
	}

	template <typename T, precision P, template <typename, precision> class vecType>
	GLM_FUNC_QUALIFIER vecType<bool, P> isMultiple(vecType<T, P> const & Value, T Multiple)
	{
		return (Value % Multiple) == vecType<T, P>(0);
	}

	template <typename T, precision P, template <typename, precision> class vecType>
	GLM_FUNC_QUALIFIER vecType<bool, P> isMultiple(vecType<T, P> const & Value, vecType<T, P> const & Multiple)
	{
		return (Value % Multiple) == vecType<T, P>(0);
	}

	//////////////////////
	// ceilMultiple

	template <typename genType>
	GLM_FUNC_QUALIFIER genType ceilMultiple(genType Source, genType Multiple)
	{
		return detail::compute_ceilMultiple<std::numeric_limits<genType>::is_iec559, std::numeric_limits<genType>::is_signed>::call(Source, Multiple);
	}

	template <typename T, precision P, template <typename, precision> class vecType>
	GLM_FUNC_QUALIFIER vecType<T, P> ceilMultiple(vecType<T, P> const & Source, vecType<T, P> const & Multiple)
	{
		return detail::functor2<T, P, vecType>::call(ceilMultiple, Source, Multiple);
	}

	//////////////////////
	// floorMultiple

	template <typename genType>
	GLM_FUNC_QUALIFIER genType floorMultiple(genType Source, genType Multiple)
	{
		return detail::compute_floorMultiple<std::numeric_limits<genType>::is_iec559, std::numeric_limits<genType>::is_signed>::call(Source, Multiple);
	}

	template <typename T, precision P, template <typename, precision> class vecType>
	GLM_FUNC_QUALIFIER vecType<T, P> floorMultiple(vecType<T, P> const & Source, vecType<T, P> const & Multiple)
	{
		return detail::functor2<T, P, vecType>::call(floorMultiple, Source, Multiple);
	}

	//////////////////////
	// roundMultiple

	template <typename genType>
	GLM_FUNC_QUALIFIER genType roundMultiple(genType Source, genType Multiple)
	{
		return detail::compute_roundMultiple<std::numeric_limits<genType>::is_iec559, std::numeric_limits<genType>::is_signed>::call(Source, Multiple);
	}

	template <typename T, precision P, template <typename, precision> class vecType>
	GLM_FUNC_QUALIFIER vecType<T, P> roundMultiple(vecType<T, P> const & Source, vecType<T, P> const & Multiple)
	{
		return detail::functor2<T, P, vecType>::call(roundMultiple, Source, Multiple);
	}
}//namespace glm