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ZvRzyan18christophe-lunarg
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glm/gtx/fast_exponential.inl

Lines changed: 26 additions & 34 deletions
Original file line numberDiff line numberDiff line change
@@ -5,15 +5,13 @@ namespace glm
55
template<>
66
GLM_FUNC_QUALIFIER float fastExp2(float x)
77
{
8-
/*
9-
approximated using "exp2(x)" formula
10-
for +x = exp2(x)
11-
for -x = 1/exp2(abs(x))
12-
*/
8+
//approximated using "exp2(x)" formula
9+
//for +x = exp2(x)
10+
//for -x = 1/exp2(abs(x))
1311
float mx, out, C0, C1, C2, C3, C4, C5;
1412
bool reciprocal;
1513
uint32_t exponent, tmpx;
16-
/* coefficients interval [0, 1] */
14+
// coefficients interval [0, 1]
1715
C0 = 0.00189646114543331e-00f;
1816
C1 = 0.00894282898410912e-00f;
1917
C2 = 0.05586624630452070e-00f;
@@ -36,15 +34,13 @@ namespace glm
3634
template<>
3735
GLM_FUNC_QUALIFIER double fastExp2(double x)
3836
{
39-
/*
40-
approximated using "exp2(x)" formula
41-
for +x = exp2(x)
42-
for -x = 1/exp2(abs(x))
43-
*/
37+
//approximated using "exp2(x)" formula
38+
//for +x = exp2(x)
39+
//for -x = 1/exp2(abs(x))
4440
double mx, out, C0, C1, C2, C3, C4, C5;
4541
bool reciprocal;
4642
uint64_t exponent, tmpx;
47-
/* coefficients interval [0, 1] */
43+
//coefficients interval [0, 1]
4844
C0 = 0.00189646114543331e-00;
4945
C1 = 0.00894282898410912e-00;
5046
C2 = 0.05586624630452070e-00;
@@ -67,27 +63,25 @@ namespace glm
6763
template<>
6864
GLM_FUNC_QUALIFIER float fastLog2(float x)
6965
{
70-
/*
71-
approximated using this formula "log2(x)"
72-
interval [1, 1.5]
73-
for x mantissa <= 1.5 log2(x) ≈ C0 * x + C1 * x2...
74-
for x mantissa >= 1.5 log2(x) ≈ log2(x / 1.5) + log2(1.5)
75-
for x <= 1.0 = -log2(1/x)
76-
*/
66+
//approximated using this formula "log2(x)"
67+
//interval [1, 1.5]
68+
//for x mantissa <= 1.5 log2(x) ≈ C0 * x + C1 * x2...
69+
//for x mantissa >= 1.5 log2(x) ≈ log2(x / 1.5) + log2(1.5)
70+
//for x <= 1.0 = -log2(1/x)
7771
float mx, l2, inv_three_half, lx, out, poly, C0, C1, C2, C3, C4, C5, C6;
7872
bool low, low_mantissa;
7973
uint32_t tmpx;
80-
/* coefficients */
74+
// coefficients
8175
C0 = -0.067508561412635e-00f;
8276
C1 = 0.605786644896372e-00f;
8377
C2 = -2.351461115180550e-00f;
8478
C3 = 5.175006419193522e-00f;
8579
C4 = -7.182524695365589e-00f;
8680
C5 = 7.064678543395325e-00f;
8781
C6 = -3.243977190921664e-00f;
88-
/* constants */
89-
l2 = 0.5849625f; /* log2(1.5) */
90-
inv_three_half = 0.6666667f; /* 1.0 / 1.5 */
82+
// constants
83+
l2 = 0.5849625f; //log2(1.5)
84+
inv_three_half = 0.6666667f; // 1.0 / 1.5
9185
mx = x;
9286
low = mx < 1.0f;
9387
mx = low ? (1.0f / mx) : mx;
@@ -105,27 +99,25 @@ namespace glm
10599
template<>
106100
GLM_FUNC_QUALIFIER double fastLog2(double x)
107101
{
108-
/*
109-
approximated using this formula "log2(x)"
110-
interval [1, 1.5]
111-
for x mantissa <= 1.5 log2(x) ≈ C0 * x + C1 * x2...
112-
for x mantissa >= 1.5 log2(x) ≈ log2(x / 1.5) + log2(1.5)
113-
for x <= 1.0 = -log2(1/x)
114-
*/
102+
//approximated using this formula "log2(x)"
103+
//interval [1, 1.5]
104+
//for x mantissa <= 1.5 log2(x) ≈ C0 * x + C1 * x2...
105+
//for x mantissa >= 1.5 log2(x) ≈ log2(x / 1.5) + log2(1.5)
106+
//for x <= 1.0 = -log2(1/x)
115107
double mx, l2, inv_three_half, lx, out, poly, C0, C1, C2, C3, C4, C5, C6;
116108
bool low, low_mantissa;
117109
uint64_t tmpx;
118-
/* coefficients */
110+
// coefficients
119111
C0 = -0.067508561412635e-00;
120112
C1 = 0.605786644896372e-00;
121113
C2 = -2.351461115180550e-00;
122114
C3 = 5.175006419193522e-00;
123115
C4 = -7.182524695365589e-00;
124116
C5 = 7.064678543395325e-00;
125117
C6 = -3.243977190921664e-00;
126-
/* constants */
127-
l2 = 0.5849625; /* log2(1.5) */
128-
inv_three_half = 0.6666667; /* 1.0 / 1.5 */
118+
// constants
119+
l2 = 0.5849625; // log2(1.5)
120+
inv_three_half = 0.6666667; // 1.0 / 1.5
129121
mx = x;
130122
low = mx < 1.0;
131123
mx = low ? (1.0 / mx) : mx;

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