1 /*
2 Copyright (C) 1997-2016 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
36 int done;
37
38 void
DrawPoints(SDL_Renderer * renderer)39 DrawPoints(SDL_Renderer * renderer)
40 {
41 int i;
42 int x, y;
43 SDL_Rect viewport;
44
45 /* Query the sizes */
46 SDL_RenderGetViewport(renderer, &viewport);
47
48 for (i = 0; i < num_objects * 4; ++i) {
49 /* Cycle the color and alpha, if desired */
50 if (cycle_color) {
51 current_color += cycle_direction;
52 if (current_color < 0) {
53 current_color = 0;
54 cycle_direction = -cycle_direction;
55 }
56 if (current_color > 255) {
57 current_color = 255;
58 cycle_direction = -cycle_direction;
59 }
60 }
61 if (cycle_alpha) {
62 current_alpha += cycle_direction;
63 if (current_alpha < 0) {
64 current_alpha = 0;
65 cycle_direction = -cycle_direction;
66 }
67 if (current_alpha > 255) {
68 current_alpha = 255;
69 cycle_direction = -cycle_direction;
70 }
71 }
72 SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
73 (Uint8) current_color, (Uint8) current_alpha);
74
75 x = rand() % viewport.w;
76 y = rand() % viewport.h;
77 SDL_RenderDrawPoint(renderer, x, y);
78 }
79 }
80
81 void
DrawLines(SDL_Renderer * renderer)82 DrawLines(SDL_Renderer * renderer)
83 {
84 int i;
85 int x1, y1, x2, y2;
86 SDL_Rect viewport;
87
88 /* Query the sizes */
89 SDL_RenderGetViewport(renderer, &viewport);
90
91 for (i = 0; i < num_objects; ++i) {
92 /* Cycle the color and alpha, if desired */
93 if (cycle_color) {
94 current_color += cycle_direction;
95 if (current_color < 0) {
96 current_color = 0;
97 cycle_direction = -cycle_direction;
98 }
99 if (current_color > 255) {
100 current_color = 255;
101 cycle_direction = -cycle_direction;
102 }
103 }
104 if (cycle_alpha) {
105 current_alpha += cycle_direction;
106 if (current_alpha < 0) {
107 current_alpha = 0;
108 cycle_direction = -cycle_direction;
109 }
110 if (current_alpha > 255) {
111 current_alpha = 255;
112 cycle_direction = -cycle_direction;
113 }
114 }
115 SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
116 (Uint8) current_color, (Uint8) current_alpha);
117
118 if (i == 0) {
119 SDL_RenderDrawLine(renderer, 0, 0, viewport.w - 1, viewport.h - 1);
120 SDL_RenderDrawLine(renderer, 0, viewport.h - 1, viewport.w - 1, 0);
121 SDL_RenderDrawLine(renderer, 0, viewport.h / 2, viewport.w - 1, viewport.h / 2);
122 SDL_RenderDrawLine(renderer, viewport.w / 2, 0, viewport.w / 2, viewport.h - 1);
123 } else {
124 x1 = (rand() % (viewport.w*2)) - viewport.w;
125 x2 = (rand() % (viewport.w*2)) - viewport.w;
126 y1 = (rand() % (viewport.h*2)) - viewport.h;
127 y2 = (rand() % (viewport.h*2)) - viewport.h;
128 SDL_RenderDrawLine(renderer, x1, y1, x2, y2);
129 }
130 }
131 }
132
133 void
DrawRects(SDL_Renderer * renderer)134 DrawRects(SDL_Renderer * renderer)
135 {
136 int i;
137 SDL_Rect rect;
138 SDL_Rect viewport;
139
140 /* Query the sizes */
141 SDL_RenderGetViewport(renderer, &viewport);
142
143 for (i = 0; i < num_objects / 4; ++i) {
144 /* Cycle the color and alpha, if desired */
145 if (cycle_color) {
146 current_color += cycle_direction;
147 if (current_color < 0) {
148 current_color = 0;
149 cycle_direction = -cycle_direction;
150 }
151 if (current_color > 255) {
152 current_color = 255;
153 cycle_direction = -cycle_direction;
154 }
155 }
156 if (cycle_alpha) {
157 current_alpha += cycle_direction;
158 if (current_alpha < 0) {
159 current_alpha = 0;
160 cycle_direction = -cycle_direction;
161 }
162 if (current_alpha > 255) {
163 current_alpha = 255;
164 cycle_direction = -cycle_direction;
165 }
166 }
167 SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
168 (Uint8) current_color, (Uint8) current_alpha);
169
170 rect.w = rand() % (viewport.h / 2);
171 rect.h = rand() % (viewport.h / 2);
172 rect.x = (rand() % (viewport.w*2) - viewport.w) - (rect.w / 2);
173 rect.y = (rand() % (viewport.h*2) - viewport.h) - (rect.h / 2);
174 SDL_RenderFillRect(renderer, &rect);
175 }
176 }
177
178 void
loop()179 loop()
180 {
181 int i;
182 SDL_Event event;
183
184 /* Check for events */
185 while (SDL_PollEvent(&event)) {
186 SDLTest_CommonEvent(state, &event, &done);
187 }
188 for (i = 0; i < state->num_windows; ++i) {
189 SDL_Renderer *renderer = state->renderers[i];
190 if (state->windows[i] == NULL)
191 continue;
192 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
193 SDL_RenderClear(renderer);
194
195 DrawRects(renderer);
196 DrawLines(renderer);
197 DrawPoints(renderer);
198
199 SDL_RenderPresent(renderer);
200 }
201 #ifdef __EMSCRIPTEN__
202 if (done) {
203 emscripten_cancel_main_loop();
204 }
205 #endif
206 }
207
208 int
main(int argc,char * argv[])209 main(int argc, char *argv[])
210 {
211 int i;
212 Uint32 then, now, frames;
213
214 /* Enable standard application logging */
215 SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
216
217 /* Initialize parameters */
218 num_objects = NUM_OBJECTS;
219
220 /* Initialize test framework */
221 state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
222 if (!state) {
223 return 1;
224 }
225 for (i = 1; i < argc;) {
226 int consumed;
227
228 consumed = SDLTest_CommonArg(state, i);
229 if (consumed == 0) {
230 consumed = -1;
231 if (SDL_strcasecmp(argv[i], "--blend") == 0) {
232 if (argv[i + 1]) {
233 if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
234 blendMode = SDL_BLENDMODE_NONE;
235 consumed = 2;
236 } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
237 blendMode = SDL_BLENDMODE_BLEND;
238 consumed = 2;
239 } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
240 blendMode = SDL_BLENDMODE_ADD;
241 consumed = 2;
242 } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
243 blendMode = SDL_BLENDMODE_MOD;
244 consumed = 2;
245 }
246 }
247 } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
248 cycle_color = SDL_TRUE;
249 consumed = 1;
250 } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
251 cycle_alpha = SDL_TRUE;
252 consumed = 1;
253 } else if (SDL_isdigit(*argv[i])) {
254 num_objects = SDL_atoi(argv[i]);
255 consumed = 1;
256 }
257 }
258 if (consumed < 0) {
259 SDL_Log("Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
260 argv[0], SDLTest_CommonUsage(state));
261 return 1;
262 }
263 i += consumed;
264 }
265 if (!SDLTest_CommonInit(state)) {
266 return 2;
267 }
268
269 /* Create the windows and initialize the renderers */
270 for (i = 0; i < state->num_windows; ++i) {
271 SDL_Renderer *renderer = state->renderers[i];
272 SDL_SetRenderDrawBlendMode(renderer, blendMode);
273 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
274 SDL_RenderClear(renderer);
275 }
276
277 srand((unsigned int)time(NULL));
278
279 /* Main render loop */
280 frames = 0;
281 then = SDL_GetTicks();
282 done = 0;
283
284 #ifdef __EMSCRIPTEN__
285 emscripten_set_main_loop(loop, 0, 1);
286 #else
287 while (!done) {
288 ++frames;
289 loop();
290 }
291 #endif
292
293
294 SDLTest_CommonQuit(state);
295
296 /* Print out some timing information */
297 now = SDL_GetTicks();
298 if (now > then) {
299 double fps = ((double) frames * 1000) / (now - then);
300 SDL_Log("%2.2f frames per second\n", fps);
301 }
302 return 0;
303 }
304
305 /* vi: set ts=4 sw=4 expandtab: */
306