keii.dev
1/*
2 Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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_test_common.h>
15#include <SDL3/SDL_main.h>
16#include "testutils.h"
17
18#ifdef SDL_PLATFORM_EMSCRIPTEN
19#include <emscripten/emscripten.h>
20#endif
21
22#include <stdlib.h>
23
24static SDLTest_CommonState *state;
25
26typedef struct
27{
28 SDL_Window *window;
29 SDL_Renderer *renderer;
30 SDL_Texture *background;
31 SDL_Texture *sprite;
32 SDL_FRect sprite_rect;
33 int scale_direction;
34} DrawState;
35
36static DrawState *drawstates;
37static int done;
38
39/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
40static void
41quit(int rc)
42{
43 SDLTest_CommonQuit(state);
44 /* Let 'main()' return normally */
45 if (rc != 0) {
46 exit(rc);
47 }
48}
49
50static void Draw(DrawState *s)
51{
52 SDL_Rect viewport;
53
54 SDL_GetRenderViewport(s->renderer, &viewport);
55
56 /* Draw the background */
57 SDL_RenderTexture(s->renderer, s->background, NULL, NULL);
58
59 /* Scale and draw the sprite */
60 s->sprite_rect.w += s->scale_direction;
61 s->sprite_rect.h += s->scale_direction;
62 if (s->scale_direction > 0) {
63 if (s->sprite_rect.w >= viewport.w || s->sprite_rect.h >= viewport.h) {
64 s->scale_direction = -1;
65 }
66 } else {
67 if (s->sprite_rect.w <= 1 || s->sprite_rect.h <= 1) {
68 s->scale_direction = 1;
69 }
70 }
71 s->sprite_rect.x = (float)((viewport.w - s->sprite_rect.w) / 2);
72 s->sprite_rect.y = (float)((viewport.h - s->sprite_rect.h) / 2);
73
74 SDL_RenderTexture(s->renderer, s->sprite, NULL, &s->sprite_rect);
75
76 /* Update the screen! */
77 SDL_RenderPresent(s->renderer);
78}
79
80static void loop(void)
81{
82 int i;
83 SDL_Event event;
84
85 /* Check for events */
86 while (SDL_PollEvent(&event)) {
87 SDLTest_CommonEvent(state, &event, &done);
88 }
89 for (i = 0; i < state->num_windows; ++i) {
90 if (state->windows[i] == NULL) {
91 continue;
92 }
93 Draw(&drawstates[i]);
94 }
95#ifdef SDL_PLATFORM_EMSCRIPTEN
96 if (done) {
97 emscripten_cancel_main_loop();
98 }
99#endif
100}
101
102int main(int argc, char *argv[])
103{
104 int i;
105 int frames;
106 Uint64 then, now;
107
108 /* Initialize test framework */
109 state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
110 if (!state) {
111 return 1;
112 }
113
114 /* Parse commandline */
115 if (!SDLTest_CommonDefaultArgs(state, argc, argv)) {
116 return 1;
117 }
118
119 if (!SDLTest_CommonInit(state)) {
120 quit(1);
121 }
122
123 drawstates = SDL_stack_alloc(DrawState, state->num_windows);
124 for (i = 0; i < state->num_windows; ++i) {
125 DrawState *drawstate = &drawstates[i];
126
127 drawstate->window = state->windows[i];
128 drawstate->renderer = state->renderers[i];
129 drawstate->sprite = LoadTexture(drawstate->renderer, "icon.bmp", true, NULL, NULL);
130 drawstate->background = LoadTexture(drawstate->renderer, "sample.bmp", false, NULL, NULL);
131 if (!drawstate->sprite || !drawstate->background) {
132 quit(2);
133 }
134 SDL_GetTextureSize(drawstate->sprite, &drawstate->sprite_rect.w, &drawstate->sprite_rect.h);
135 drawstate->scale_direction = 1;
136 }
137
138 /* Main render loop */
139 frames = 0;
140 then = SDL_GetTicks();
141 done = 0;
142
143#ifdef SDL_PLATFORM_EMSCRIPTEN
144 emscripten_set_main_loop(loop, 0, 1);
145#else
146 while (!done) {
147 ++frames;
148 loop();
149 }
150#endif
151
152 /* Print out some timing information */
153 now = SDL_GetTicks();
154 if (now > then) {
155 double fps = ((double)frames * 1000) / (now - then);
156 SDL_Log("%2.2f frames per second\n", fps);
157 }
158
159 SDL_stack_free(drawstates);
160
161 quit(0);
162 return 0;
163}