Atlas - testspriteminimal.c
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[FILE BEGIN]
1/*
2  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
3
4  This software is provided 'as-is', without any express or implied
5  warranty.  In no event will the authors be held liable for any damages
6  arising from the use of this software.
7
8  Permission is granted to anyone to use this software for any purpose,
9  including commercial applications, and to alter it and redistribute it
10  freely.
11*/
12/* Simple program:  Move N sprites around on the screen as fast as possible */
13
14#include <SDL3/SDL.h>
15#include <SDL3/SDL_main.h>
16
17#ifdef SDL_PLATFORM_EMSCRIPTEN
18#include <emscripten/emscripten.h>
19#endif
20
21#include "icon.h"
22
23#define WINDOW_WIDTH  640
24#define WINDOW_HEIGHT 480
25#define NUM_SPRITES   100
26#define MAX_SPEED     1
27
28static SDL_Texture *sprite;
29static SDL_FRect positions[NUM_SPRITES];
30static SDL_FRect velocities[NUM_SPRITES];
31static int sprite_w, sprite_h;
32
33static SDL_Renderer *renderer;
34static int done;
35
36static SDL_Texture *CreateTexture(SDL_Renderer *r, unsigned char *data, unsigned int len, int *w, int *h)
37{
38    SDL_Texture *texture = NULL;
39    SDL_Surface *surface;
40    SDL_IOStream *src = SDL_IOFromConstMem(data, len);
41    if (src) {
42        surface = SDL_LoadPNG_IO(src, true);
43        if (surface) {
44            /* Treat white as transparent */
45            SDL_SetSurfaceColorKey(surface, true, SDL_MapSurfaceRGB(surface, 255, 255, 255));
46
47            texture = SDL_CreateTextureFromSurface(r, surface);
48            *w = surface->w;
49            *h = surface->h;
50            SDL_DestroySurface(surface);
51        }
52    }
53    return texture;
54}
55
56static void MoveSprites(void)
57{
58    int i;
59    int window_w = WINDOW_WIDTH;
60    int window_h = WINDOW_HEIGHT;
61    SDL_FRect *position, *velocity;
62
63    /* Draw a gray background */
64    SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
65    SDL_RenderClear(renderer);
66
67    /* Move the sprite, bounce at the wall, and draw */
68    for (i = 0; i < NUM_SPRITES; ++i) {
69        position = &positions[i];
70        velocity = &velocities[i];
71        position->x += velocity->x;
72        if ((position->x < 0) || (position->x >= (window_w - sprite_w))) {
73            velocity->x = -velocity->x;
74            position->x += velocity->x;
75        }
76        position->y += velocity->y;
77        if ((position->y < 0) || (position->y >= (window_h - sprite_h))) {
78            velocity->y = -velocity->y;
79            position->y += velocity->y;
80        }
81
82        /* Blit the sprite onto the screen */
83        SDL_RenderTexture(renderer, sprite, NULL, position);
84    }
85
86    /* Update the screen! */
87    SDL_RenderPresent(renderer);
88}
89
90static void loop(void)
91{
92    SDL_Event event;
93
94    /* Check for events */
95    while (SDL_PollEvent(&event)) {
96        if (event.type == SDL_EVENT_QUIT ||
97            (event.type == SDL_EVENT_KEY_DOWN && event.key.key == SDLK_ESCAPE)) {
98            done = 1;
99        }
100    }
101    MoveSprites();
102#ifdef SDL_PLATFORM_EMSCRIPTEN
103    if (done) {
104        emscripten_cancel_main_loop();
105    }
106#endif
107}
108
109int main(int argc, char *argv[])
110{
111    SDL_Window *window = NULL;
112    int return_code = -1;
113    int i;
114
115    if (argc > 1) {
116        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "USAGE: %s", argv[0]);
117        return_code = 1;
118        goto quit;
119    }
120
121    if (!SDL_CreateWindowAndRenderer("testspriteminimal", WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_RESIZABLE, &window, &renderer)) {
122        return_code = 2;
123        goto quit;
124    }
125
126    SDL_SetRenderLogicalPresentation(renderer, WINDOW_WIDTH, WINDOW_HEIGHT, SDL_LOGICAL_PRESENTATION_LETTERBOX);
127
128    sprite = CreateTexture(renderer, icon_png, icon_png_len, &sprite_w, &sprite_h);
129
130    if (!sprite) {
131        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture (%s)", SDL_GetError());
132        return_code = 3;
133        goto quit;
134    }
135
136    /* Initialize the sprite positions */
137    for (i = 0; i < NUM_SPRITES; ++i) {
138        positions[i].x = (float)SDL_rand(WINDOW_WIDTH - sprite_w);
139        positions[i].y = (float)SDL_rand(WINDOW_HEIGHT - sprite_h);
140        positions[i].w = (float)sprite_w;
141        positions[i].h = (float)sprite_h;
142        velocities[i].x = 0.0f;
143        velocities[i].y = 0.0f;
144        while (velocities[i].x == 0.f && velocities[i].y == 0.f) {
145            velocities[i].x = (float)(SDL_rand(MAX_SPEED * 2 + 1) - MAX_SPEED);
146            velocities[i].y = (float)(SDL_rand(MAX_SPEED * 2 + 1) - MAX_SPEED);
147        }
148    }
149
150    /* Main render loop */
151    done = 0;
152
153#ifdef SDL_PLATFORM_EMSCRIPTEN
154    emscripten_set_main_loop(loop, 0, 1);
155#else
156    while (!done) {
157        loop();
158    }
159#endif
160    return_code = 0;
161quit:
162    SDL_DestroyRenderer(renderer);
163    SDL_DestroyWindow(window);
164    SDL_Quit();
165    return return_code;
166}
167
[FILE END]
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