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apps/examples/circle-raster: add acc precalc method

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This commit is contained in:
veclavtalica 2025-01-25 05:48:11 +03:00
parent ab3c032313
commit dd158dee01
1 changed files with 21 additions and 1 deletions
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22
apps/examples/circle-raster/game.c
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@ -76,6 +76,26 @@ static void benchmark(struct state *state) {
profile_end("int32_t acc"); profile_end("int32_t acc");
profile_start("int32_t acc precalc");
for (int i = 0; i < 1000; ++i) {
int32_t const rsi = (int32_t)state->r * (int32_t)state->r;
int32_t acc = (int32_t)(sqrtf(state->r * state->r - (state->r - 1) * (state->r - 1)));
for (int32_t iy = (int32_t)state->r - 1; iy >= 0; --iy) {
while (acc * acc < rsi - iy * iy) acc++;
for (int32_t ix = -acc; ix < acc; ++ix) {
/* lower portion */
x = (float)ix;
y = (float)iy;
/* upper portion */
x = (float)ix;
y = (float)(int32_t)(~(uint32_t)iy);
}
}
}
profile_end("int32_t acc precalc");
(void)x; (void)y; (void)x; (void)y;
} }
@ -85,7 +105,7 @@ void game_tick(void) {
if (!ctx.udata) { if (!ctx.udata) {
ctx.udata = ccalloc(1, sizeof (struct state)); ctx.udata = ccalloc(1, sizeof (struct state));
struct state *state = ctx.udata; struct state *state = ctx.udata;
state->r = 10; state->r = 24;
} }
} }