SDL/test/testspriteminimal.c

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/*
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Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely.
*/
/* Simple program: Move N sprites around on the screen as fast as possible */
#include <stdlib.h>
#include <time.h>
#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif
#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h>
#include "testutils.h"
#define WINDOW_WIDTH 640
#define WINDOW_HEIGHT 480
#define NUM_SPRITES 100
#define MAX_SPEED 1
static SDL_Texture *sprite;
static SDL_FRect positions[NUM_SPRITES];
static SDL_FRect velocities[NUM_SPRITES];
static int sprite_w, sprite_h;
SDL_Renderer *renderer;
int done;
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
quit(int rc)
{
SDL_Quit();
exit(rc);
}
void MoveSprites()
{
int i;
int window_w = WINDOW_WIDTH;
int window_h = WINDOW_HEIGHT;
SDL_FRect *position, *velocity;
/* Draw a gray background */
SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
SDL_RenderClear(renderer);
/* Move the sprite, bounce at the wall, and draw */
for (i = 0; i < NUM_SPRITES; ++i) {
position = &positions[i];
velocity = &velocities[i];
position->x += velocity->x;
if ((position->x < 0) || (position->x >= (window_w - sprite_w))) {
velocity->x = -velocity->x;
position->x += velocity->x;
}
position->y += velocity->y;
if ((position->y < 0) || (position->y >= (window_h - sprite_h))) {
velocity->y = -velocity->y;
position->y += velocity->y;
}
/* Blit the sprite onto the screen */
SDL_RenderTexture(renderer, sprite, NULL, position);
}
/* Update the screen! */
SDL_RenderPresent(renderer);
}
void loop()
{
SDL_Event event;
/* Check for events */
while (SDL_PollEvent(&event)) {
if (event.type == SDL_QUIT || event.type == SDL_KEYDOWN) {
done = 1;
}
}
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MoveSprites();
#ifdef __EMSCRIPTEN__
if (done) {
emscripten_cancel_main_loop();
}
#endif
}
int main(int argc, char *argv[])
{
SDL_Window *window;
int i;
/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
if (SDL_CreateWindowAndRenderer(WINDOW_WIDTH, WINDOW_HEIGHT, 0, &window, &renderer) < 0) {
quit(2);
}
sprite = LoadTexture(renderer, "icon.bmp", SDL_TRUE, &sprite_w, &sprite_h);
if (sprite == NULL) {
quit(2);
}
/* Initialize the sprite positions */
srand((unsigned int)time(NULL));
for (i = 0; i < NUM_SPRITES; ++i) {
positions[i].x = (float)(rand() % (WINDOW_WIDTH - sprite_w));
positions[i].y = (float)(rand() % (WINDOW_HEIGHT - sprite_h));
positions[i].w = (float)sprite_w;
positions[i].h = (float)sprite_h;
velocities[i].x = 0.0f;
velocities[i].y = 0.0f;
while (!velocities[i].x && !velocities[i].y) {
velocities[i].x = (float)((rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED);
velocities[i].y = (float)((rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED);
}
}
/* Main render loop */
done = 0;
#ifdef __EMSCRIPTEN__
emscripten_set_main_loop(loop, 0, 1);
#else
while (!done) {
loop();
}
#endif
quit(0);
return 0; /* to prevent compiler warning */
}