Atlas - testspritesurface.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: Test surface blitting. */
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_Surface *sprite;
29static SDL_Rect positions[NUM_SPRITES];
30static SDL_Rect velocities[NUM_SPRITES];
31static int sprite_w, sprite_h;
32
33SDL_Window *window;
34SDL_Surface *window_surf;
35static int done;
36
37static SDL_Surface *CreateSurface(unsigned char *data, unsigned int len, int *w, int *h) {
38    SDL_Surface *surface = NULL;
39    SDL_IOStream *src = SDL_IOFromConstMem(data, len);
40    if (src) {
41        surface = SDL_LoadPNG_IO(src, true);
42        if (surface) {
43            /* Treat white as transparent */
44            SDL_SetSurfaceColorKey(surface, true, SDL_MapSurfaceRGB(surface, 255, 255, 255));
45
46            *w = surface->w;
47            *h = surface->h;
48        }
49    }
50    return surface;
51}
52
53static void MoveSprites(void)
54{
55    int i;
56    int window_w = WINDOW_WIDTH;
57    int window_h = WINDOW_HEIGHT;
58    SDL_Rect *position, *velocity;
59    Uint32 background = SDL_MapSurfaceRGB(window_surf, 0xA0, 0xA0, 0xA0);
60    SDL_FillSurfaceRect(window_surf, NULL, background);
61
62    /* Move the sprite, bounce at the wall, and draw */
63    for (i = 0; i < NUM_SPRITES; ++i) {
64        position = &positions[i];
65        velocity = &velocities[i];
66        position->x += velocity->x;
67        if ((position->x < 0) || (position->x >= (window_w - sprite_w))) {
68            velocity->x = -velocity->x;
69            position->x += velocity->x;
70        }
71        position->y += velocity->y;
72        if ((position->y < 0) || (position->y >= (window_h - sprite_h))) {
73            velocity->y = -velocity->y;
74            position->y += velocity->y;
75        }
76
77        /* Blit the sprite onto the screen */
78        SDL_BlitSurface(sprite, NULL, window_surf, position);
79    }
80
81    /* Update the screen! */
82    SDL_UpdateWindowSurface(window);
83}
84
85static void loop(void)
86{
87    SDL_Event event;
88
89    /* Check for events */
90    while (SDL_PollEvent(&event)) {
91        if (event.type == SDL_EVENT_QUIT || event.type == SDL_EVENT_KEY_DOWN) {
92            done = 1;
93        }
94    }
95    MoveSprites();
96#ifdef SDL_PLATFORM_EMSCRIPTEN
97    if (done) {
98        emscripten_cancel_main_loop();
99    }
100#endif
101}
102
103int main(int argc, char *argv[])
104{
105    int return_code = -1;
106    int i;
107
108    if (argc > 1) {
109        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "USAGE: %s", argv[0]);
110        return_code = 1;
111        goto quit;
112    }
113
114    if ((window = SDL_CreateWindow("testspritesurface", WINDOW_WIDTH, WINDOW_HEIGHT, 0)) == NULL) {
115        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create window (%s)", SDL_GetError());
116        return_code = 2;
117        goto quit;
118    }
119
120    if ((window_surf = SDL_GetWindowSurface(window)) == NULL) {
121        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't acquire window surface (%s)", SDL_GetError());
122        return_code = 3;
123        goto quit;
124    }
125
126    sprite = CreateSurface(icon_png, icon_png_len, &sprite_w, &sprite_h);
127
128    if (!sprite) {
129        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create surface (%s)", SDL_GetError());
130        return_code = 4;
131        goto quit;
132    }
133
134    /* Initialize the sprite positions */
135    for (i = 0; i < NUM_SPRITES; ++i) {
136        positions[i].x = SDL_rand(WINDOW_WIDTH - sprite_w);
137        positions[i].y = SDL_rand(WINDOW_HEIGHT - sprite_h);
138        positions[i].w = sprite_w;
139        positions[i].h = sprite_h;
140        velocities[i].x = 0;
141        velocities[i].y = 0;
142        while (velocities[i].x == 0.f && velocities[i].y == 0.f) {
143            velocities[i].x = (SDL_rand(MAX_SPEED * 2 + 1)) - MAX_SPEED;
144            velocities[i].y = (SDL_rand(MAX_SPEED * 2 + 1)) - MAX_SPEED;
145        }
146    }
147
148    /* Main render loop */
149    done = 0;
150
151#ifdef SDL_PLATFORM_EMSCRIPTEN
152    emscripten_set_main_loop(loop, 0, 1);
153#else
154    while (!done) {
155        loop();
156    }
157#endif
158    return_code = 0;
159quit:
160    if (sprite) {
161        SDL_DestroySurface(sprite);
162        sprite = NULL;
163    }
164    if (window_surf) {
165        SDL_DestroyWindowSurface(window);
166        window_surf = NULL;
167    }
168    if (window) {
169        SDL_DestroyWindow(window);
170        window = NULL;
171    }
172    SDL_Quit();
173    return return_code;
174}
175
[FILE END]
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