1 /*
2 Copyright (C) 1997-2021 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
13 /* Simple program: draw as many random objects on the screen as possible */
14
15 #include <stdlib.h>
16 #include <stdio.h>
17 #include <time.h>
18
19 #ifdef __EMSCRIPTEN__
20 #include <emscripten/emscripten.h>
21 #endif
22
23 #include "SDL_test_common.h"
24
25 #define NUM_OBJECTS 100
26
27 static SDLTest_CommonState *state;
28 static int num_objects;
29 static SDL_bool cycle_color;
30 static SDL_bool cycle_alpha;
31 static int cycle_direction = 1;
32 static int current_alpha = 255;
33 static int current_color = 255;
34 static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
35 static Uint32 next_fps_check, frames;
36 static const Uint32 fps_check_delay = 5000;
37
38 int done;
39
40 void
DrawPoints(SDL_Renderer * renderer)41 DrawPoints(SDL_Renderer * renderer)
42 {
43 int i;
44 int x, y;
45 SDL_Rect viewport;
46
47 /* Query the sizes */
48 SDL_RenderGetViewport(renderer, &viewport);
49
50 for (i = 0; i < num_objects * 4; ++i) {
51 /* Cycle the color and alpha, if desired */
52 if (cycle_color) {
53 current_color += cycle_direction;
54 if (current_color < 0) {
55 current_color = 0;
56 cycle_direction = -cycle_direction;
57 }
58 if (current_color > 255) {
59 current_color = 255;
60 cycle_direction = -cycle_direction;
61 }
62 }
63 if (cycle_alpha) {
64 current_alpha += cycle_direction;
65 if (current_alpha < 0) {
66 current_alpha = 0;
67 cycle_direction = -cycle_direction;
68 }
69 if (current_alpha > 255) {
70 current_alpha = 255;
71 cycle_direction = -cycle_direction;
72 }
73 }
74 SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
75 (Uint8) current_color, (Uint8) current_alpha);
76
77 x = rand() % viewport.w;
78 y = rand() % viewport.h;
79 SDL_RenderDrawPoint(renderer, x, y);
80 }
81 }
82
83 void
DrawLines(SDL_Renderer * renderer)84 DrawLines(SDL_Renderer * renderer)
85 {
86 int i;
87 int x1, y1, x2, y2;
88 SDL_Rect viewport;
89
90 /* Query the sizes */
91 SDL_RenderGetViewport(renderer, &viewport);
92
93 for (i = 0; i < num_objects; ++i) {
94 /* Cycle the color and alpha, if desired */
95 if (cycle_color) {
96 current_color += cycle_direction;
97 if (current_color < 0) {
98 current_color = 0;
99 cycle_direction = -cycle_direction;
100 }
101 if (current_color > 255) {
102 current_color = 255;
103 cycle_direction = -cycle_direction;
104 }
105 }
106 if (cycle_alpha) {
107 current_alpha += cycle_direction;
108 if (current_alpha < 0) {
109 current_alpha = 0;
110 cycle_direction = -cycle_direction;
111 }
112 if (current_alpha > 255) {
113 current_alpha = 255;
114 cycle_direction = -cycle_direction;
115 }
116 }
117 SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
118 (Uint8) current_color, (Uint8) current_alpha);
119
120 if (i == 0) {
121 SDL_RenderDrawLine(renderer, 0, 0, viewport.w - 1, viewport.h - 1);
122 SDL_RenderDrawLine(renderer, 0, viewport.h - 1, viewport.w - 1, 0);
123 SDL_RenderDrawLine(renderer, 0, viewport.h / 2, viewport.w - 1, viewport.h / 2);
124 SDL_RenderDrawLine(renderer, viewport.w / 2, 0, viewport.w / 2, viewport.h - 1);
125 } else {
126 x1 = (rand() % (viewport.w*2)) - viewport.w;
127 x2 = (rand() % (viewport.w*2)) - viewport.w;
128 y1 = (rand() % (viewport.h*2)) - viewport.h;
129 y2 = (rand() % (viewport.h*2)) - viewport.h;
130 SDL_RenderDrawLine(renderer, x1, y1, x2, y2);
131 }
132 }
133 }
134
135 void
DrawRects(SDL_Renderer * renderer)136 DrawRects(SDL_Renderer * renderer)
137 {
138 int i;
139 SDL_Rect rect;
140 SDL_Rect viewport;
141
142 /* Query the sizes */
143 SDL_RenderGetViewport(renderer, &viewport);
144
145 for (i = 0; i < num_objects / 4; ++i) {
146 /* Cycle the color and alpha, if desired */
147 if (cycle_color) {
148 current_color += cycle_direction;
149 if (current_color < 0) {
150 current_color = 0;
151 cycle_direction = -cycle_direction;
152 }
153 if (current_color > 255) {
154 current_color = 255;
155 cycle_direction = -cycle_direction;
156 }
157 }
158 if (cycle_alpha) {
159 current_alpha += cycle_direction;
160 if (current_alpha < 0) {
161 current_alpha = 0;
162 cycle_direction = -cycle_direction;
163 }
164 if (current_alpha > 255) {
165 current_alpha = 255;
166 cycle_direction = -cycle_direction;
167 }
168 }
169 SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
170 (Uint8) current_color, (Uint8) current_alpha);
171
172 rect.w = rand() % (viewport.h / 2);
173 rect.h = rand() % (viewport.h / 2);
174 rect.x = (rand() % (viewport.w*2) - viewport.w) - (rect.w / 2);
175 rect.y = (rand() % (viewport.h*2) - viewport.h) - (rect.h / 2);
176 SDL_RenderFillRect(renderer, &rect);
177 }
178 }
179
180 void
loop()181 loop()
182 {
183 Uint32 now;
184 int i;
185 SDL_Event event;
186
187 /* Check for events */
188 while (SDL_PollEvent(&event)) {
189 SDLTest_CommonEvent(state, &event, &done);
190 }
191 for (i = 0; i < state->num_windows; ++i) {
192 SDL_Renderer *renderer = state->renderers[i];
193 if (state->windows[i] == NULL)
194 continue;
195 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
196 SDL_RenderClear(renderer);
197
198 DrawRects(renderer);
199 DrawLines(renderer);
200 DrawPoints(renderer);
201
202 SDL_RenderPresent(renderer);
203 }
204 #ifdef __EMSCRIPTEN__
205 if (done) {
206 emscripten_cancel_main_loop();
207 }
208 #endif
209 frames++;
210 now = SDL_GetTicks();
211 if (SDL_TICKS_PASSED(now, next_fps_check)) {
212 /* Print out some timing information */
213 const Uint32 then = next_fps_check - fps_check_delay;
214 const double fps = ((double) frames * 1000) / (now - then);
215 SDL_Log("%2.2f frames per second\n", fps);
216 next_fps_check = now + fps_check_delay;
217 frames = 0;
218 }
219
220 }
221
222 int
main(int argc,char * argv[])223 main(int argc, char *argv[])
224 {
225 int i;
226
227 /* Enable standard application logging */
228 SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
229
230 /* Initialize parameters */
231 num_objects = NUM_OBJECTS;
232
233 /* Initialize test framework */
234 state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
235 if (!state) {
236 return 1;
237 }
238 for (i = 1; i < argc;) {
239 int consumed;
240
241 consumed = SDLTest_CommonArg(state, i);
242 if (consumed == 0) {
243 consumed = -1;
244 if (SDL_strcasecmp(argv[i], "--blend") == 0) {
245 if (argv[i + 1]) {
246 if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
247 blendMode = SDL_BLENDMODE_NONE;
248 consumed = 2;
249 } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
250 blendMode = SDL_BLENDMODE_BLEND;
251 consumed = 2;
252 } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
253 blendMode = SDL_BLENDMODE_ADD;
254 consumed = 2;
255 } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
256 blendMode = SDL_BLENDMODE_MOD;
257 consumed = 2;
258 }
259 }
260 } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
261 cycle_color = SDL_TRUE;
262 consumed = 1;
263 } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
264 cycle_alpha = SDL_TRUE;
265 consumed = 1;
266 } else if (SDL_isdigit(*argv[i])) {
267 num_objects = SDL_atoi(argv[i]);
268 consumed = 1;
269 }
270 }
271 if (consumed < 0) {
272 static const char *options[] = {
273 "[--blend none|blend|add|mod]",
274 "[--cyclecolor]",
275 "[--cyclealpha]",
276 "[num_objects]",
277 NULL };
278 SDLTest_CommonLogUsage(state, argv[0], options);
279 return 1;
280 }
281 i += consumed;
282 }
283 if (!SDLTest_CommonInit(state)) {
284 return 2;
285 }
286
287 /* Create the windows and initialize the renderers */
288 for (i = 0; i < state->num_windows; ++i) {
289 SDL_Renderer *renderer = state->renderers[i];
290 SDL_SetRenderDrawBlendMode(renderer, blendMode);
291 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
292 SDL_RenderClear(renderer);
293 }
294
295 srand((unsigned int)time(NULL));
296
297 /* Main render loop */
298 frames = 0;
299 next_fps_check = SDL_GetTicks() + fps_check_delay;
300 done = 0;
301
302 #ifdef __EMSCRIPTEN__
303 emscripten_set_main_loop(loop, 0, 1);
304 #else
305 while (!done) {
306 loop();
307 }
308 #endif
309
310
311 SDLTest_CommonQuit(state);
312
313 return 0;
314 }
315
316 /* vi: set ts=4 sw=4 expandtab: */
317