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using cached values for some trigonometric calculations -> speedup++

This commit is contained in:
Christian Kroll 2011-09-13 21:34:22 +00:00
parent c3908da1eb
commit ce2732f8fa
1 changed files with 28 additions and 7 deletions
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35
animations/fpmath_patterns.c
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@ -65,17 +65,17 @@ static void fpmath_pattern(double const t_start,
for (unsigned char x = 0; x < NUM_COLS; ++x) for (unsigned char x = 0; x < NUM_COLS; ++x)
{ {
unsigned char const mask = shl_table[x % 8U]; unsigned char const mask = shl_table[x % 8U];
unsigned char const x8 = x / 8u; unsigned char const x_8 = x / 8u;
unsigned char const color = fpPattern(x, y, t); unsigned char const color = fpPattern(x, y, t);
for (unsigned char p = 0; p < NUMPLANE; ++p) for (unsigned char p = 0; p < NUMPLANE; ++p)
{ {
if (p <= (color - 1)) if (p <= (color - 1))
{ {
BUFFER[p][y][x8] |= mask; BUFFER[p][y][x_8] |= mask;
} }
else else
{ {
BUFFER[p][y][x8] &= ~mask; BUFFER[p][y][x_8] &= ~mask;
} }
} }
} }
@ -96,8 +96,21 @@ static void fpmath_pattern(double const t_start,
*/ */
static unsigned char fpmath_plasma(unsigned char x, unsigned char y, double t) static unsigned char fpmath_plasma(unsigned char x, unsigned char y, double t)
{ {
return (sin(x * PLASMA_X + t) + sin(dist(x, y, NUM_COLS * sin(t) + NUM_COLS, static double fFunc1[NUM_COLS];
NUM_ROWS * cos(t) + NUM_ROWS) * PLASMA_X) + 2) * (NUMPLANE - 1) / 2; static double fFunc2CosArg;
static double fFunc2SinArg;
if (x == 0 && y == 0)
{
fFunc2CosArg = NUM_ROWS * cos(t) + NUM_ROWS;
fFunc2SinArg = NUM_COLS * sin(t) + NUM_COLS;
}
if (y == 0)
{
fFunc1[x] = sin(x * PLASMA_X + t);
}
return (fFunc1[x] + sin(dist(x, y, fFunc2SinArg, fFunc2CosArg) * PLASMA_X)
+ 2) * (NUMPLANE - 1) / 2;
} }
void plasma(void) void plasma(void)
@ -117,8 +130,16 @@ void plasma(void)
*/ */
static unsigned char fpmath_psycho(unsigned char x, unsigned char y, double t) static unsigned char fpmath_psycho(unsigned char x, unsigned char y, double t)
{ {
return (sin(dist(x, y, NUM_COLS * cos(t), NUM_ROWS * sin(t)) - t * 10) + 1) static double fCosinus;
* (NUMPLANE - 1); static double fSinus;
static double t10;
if (x == 0 && y == 0)
{
fCosinus = NUM_COLS * cos(t);
fSinus = NUM_ROWS * sin(t);
t10 = t * 10;
}
return (sin(dist(x, y, fCosinus, fSinus) - t10) + 1) * (NUMPLANE - 1);
} }
void psychedelic(void) void psychedelic(void)