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Rename xorshift_basic to xorshift_256

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Abdelrahman Said 2024-03-22 09:48:14 +00:00
parent 038172f593
commit 546229e412
1 changed files with 19 additions and 14 deletions
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33
xorshift.c
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@ -9,9 +9,10 @@ typedef struct {
u64 y; u64 y;
u64 z; u64 z;
u64 w; u64 w;
} XORShiftBasic; } XORShift256;
u64 xor_shift_basic_generate(XORShiftBasic *state); void test_xorshift_256(Pixel *data, u64 w, u64 h);
u64 xorshift_256_generate(XORShift256 *state);
int main(int argc, char *argv[]) { int main(int argc, char *argv[]) {
struct timespec ts = {0}; struct timespec ts = {0};
@ -19,23 +20,31 @@ int main(int argc, char *argv[]) {
srand48(ts.tv_nsec); srand48(ts.tv_nsec);
XORShiftBasic state = { u64 w = 1024;
u64 h = 1024;
u64 length = w * h;
Pixel data[length];
test_xorshift_256(data, w, h);
write_p6_ppm("./outputs/xorshift_256.ppm", w, h, data);
return EXIT_SUCCESS;
}
void test_xorshift_256(Pixel *data, u64 w, u64 h) {
XORShift256 state = {
.x = lrand48(), .x = lrand48(),
.y = lrand48(), .y = lrand48(),
.z = lrand48(), .z = lrand48(),
.w = lrand48(), .w = lrand48(),
}; };
u64 w = 1024;
u64 h = 1024;
u64 length = w * h;
Pixel data[length];
for (u64 y = 0; y < h; ++y) { for (u64 y = 0; y < h; ++y) {
for (u64 x = 0; x < w; ++x) { for (u64 x = 0; x < w; ++x) {
u64 i = y * w + x; u64 i = y * w + x;
u8 pixel = xor_shift_basic_generate(&state) % UINT8_MAX; u8 pixel = xorshift_256_generate(&state) % UINT8_MAX;
data[i] = (Pixel){ data[i] = (Pixel){
.r = pixel, .r = pixel,
.g = pixel, .g = pixel,
@ -43,13 +52,9 @@ int main(int argc, char *argv[]) {
}; };
} }
} }
write_p6_ppm("./outputs/xorshift.ppm", w, h, data);
return EXIT_SUCCESS;
} }
u64 xor_shift_basic_generate(XORShiftBasic *state) { u64 xorshift_256_generate(XORShift256 *state) {
u64 t = state->x ^ (state->x << 11); u64 t = state->x ^ (state->x << 11);
state->x = state->y; state->x = state->y;