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Added SDL_srand(), SDL_rand(), and SDL_rand_r() (thanks @JKaniarz!)

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These are simple random functions that should not be used for serious random number generation.

Fixes https://github.com/libsdl-org/SDL/issues/4968
This commit is contained in:
Sam Lantinga
2024-06-16 07:20:11 -07:00
parent 9cb4bb92f6
commit d1d484ddbe
23 changed files with 203 additions and 89 deletions
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14
test/testnative.c
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@@ -11,6 +11,8 @@
*/
/* Simple program: Create a native window and attach an SDL renderer */
#include <stdlib.h>
#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h>
#include <SDL3/SDL_test.h>
@@ -18,9 +20,6 @@
#include "testnative.h"
#include "testutils.h"
#include <stdlib.h> /* for srand() */
#include <time.h> /* for time() */
#define WINDOW_W 640
#define WINDOW_H 480
#define NUM_SPRITES 100
@@ -188,17 +187,16 @@ int main(int argc, char *argv[])
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Out of memory!\n");
quit(2);
}
srand((unsigned int)time(NULL));
for (i = 0; i < NUM_SPRITES; ++i) {
positions[i].x = (float)(rand() % (window_w - (int)sprite_w));
positions[i].y = (float)(rand() % (window_h - (int)sprite_h));
positions[i].x = (float)(SDL_rand() % (window_w - (int)sprite_w));
positions[i].y = (float)(SDL_rand() % (window_h - (int)sprite_h));
positions[i].w = sprite_w;
positions[i].h = sprite_h;
velocities[i].x = 0.0f;
velocities[i].y = 0.0f;
while (velocities[i].x == 0.f && velocities[i].y == 0.f) {
velocities[i].x = (float)((rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED);
velocities[i].y = (float)((rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED);
velocities[i].x = (float)((SDL_rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED);
velocities[i].y = (float)((SDL_rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED);
}
}