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 SWAP(typ,a,b) do{typ t=a;a=b;b=t;}while(0)
26#define NUM_OBJECTS 100
27
28static SDLTest_CommonState *state;
29static int num_objects;
30static SDL_bool cycle_color;
31static SDL_bool cycle_alpha;
32static int cycle_direction = 1;
33static int current_alpha = 255;
34static int current_color = 255;
35static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
36
37int mouse_begin_x = -1, mouse_begin_y = -1;
38int done;
39
40void
41DrawPoints(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#define MAX_LINES 16
84int num_lines = 0;
85SDL_Rect lines[MAX_LINES];
86static int
87add_line(int x1, int y1, int x2, int y2)
88{
89 if (num_lines >= MAX_LINES)
90 return 0;
91 if ((x1 == x2) && (y1 == y2))
92 return 0;
93
94 SDL_Log("adding line (%d, %d), (%d, %d)\n", x1, y1, x2, y2);
95 lines[num_lines].x = x1;
96 lines[num_lines].y = y1;
97 lines[num_lines].w = x2;
98 lines[num_lines].h = y2;
99
100 return ++num_lines;
101}
102
103
104void
105DrawLines(SDL_Renderer * renderer)
106{
107 int i;
108 SDL_Rect viewport;
109
110 /* Query the sizes */
111 SDL_RenderGetViewport(renderer, &viewport);
112
113 SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
114
115 for (i = 0; i < num_lines; ++i) {
116 if (i == -1) {
117 SDL_RenderDrawLine(renderer, 0, 0, viewport.w - 1, viewport.h - 1);
118 SDL_RenderDrawLine(renderer, 0, viewport.h - 1, viewport.w - 1, 0);
119 SDL_RenderDrawLine(renderer, 0, viewport.h / 2, viewport.w - 1, viewport.h / 2);
120 SDL_RenderDrawLine(renderer, viewport.w / 2, 0, viewport.w / 2, viewport.h - 1);
121 } else {
122 SDL_RenderDrawLine(renderer, lines[i].x, lines[i].y, lines[i].w, lines[i].h);
123 }
124 }
125}
126
127#define MAX_RECTS 16
128int num_rects = 0;
129SDL_Rect rects[MAX_RECTS];
130static int
131add_rect(int x1, int y1, int x2, int y2)
132{
133 if (num_rects >= MAX_RECTS)
134 return 0;
135 if ((x1 == x2) || (y1 == y2))
136 return 0;
137
138 if (x1 > x2)
139 SWAP(int, x1, x2);
140 if (y1 > y2)
141 SWAP(int, y1, y2);
142
143 SDL_Log("adding rect (%d, %d), (%d, %d) [%dx%d]\n", x1, y1, x2, y2,
144 x2 - x1, y2 - y1);
145
146 rects[num_rects].x = x1;
147 rects[num_rects].y = y1;
148 rects[num_rects].w = x2 - x1;
149 rects[num_rects].h = y2 - y1;
150
151 return ++num_rects;
152}
153
154static void
155DrawRects(SDL_Renderer * renderer)
156{
157 SDL_SetRenderDrawColor(renderer, 255, 127, 0, 255);
158 SDL_RenderFillRects(renderer, rects, num_rects);
159}
160
161static void
162DrawRectLineIntersections(SDL_Renderer * renderer)
163{
164 int i, j;
165
166 SDL_SetRenderDrawColor(renderer, 0, 255, 55, 255);
167
168 for (i = 0; i < num_rects; i++)
169 for (j = 0; j < num_lines; j++) {
170 int x1, y1, x2, y2;
171 SDL_Rect r;
172
173 r = rects[i];
174 x1 = lines[j].x;
175 y1 = lines[j].y;
176 x2 = lines[j].w;
177 y2 = lines[j].h;
178
179 if (SDL_IntersectRectAndLine(&r, &x1, &y1, &x2, &y2)) {
180 SDL_RenderDrawLine(renderer, x1, y1, x2, y2);
181 }
182 }
183}
184
185static void
186DrawRectRectIntersections(SDL_Renderer * renderer)
187{
188 int i, j;
189
190 SDL_SetRenderDrawColor(renderer, 255, 200, 0, 255);
191
192 for (i = 0; i < num_rects; i++)
193 for (j = i + 1; j < num_rects; j++) {
194 SDL_Rect r;
195 if (SDL_IntersectRect(&rects[i], &rects[j], &r)) {
196 SDL_RenderFillRect(renderer, &r);
197 }
198 }
199}
200
201void
202loop()
203{
204 int i;
205 SDL_Event event;
206
207 /* Check for events */
208 while (SDL_PollEvent(&event)) {
209 SDLTest_CommonEvent(state, &event, &done);
210 switch (event.type) {
211 case SDL_MOUSEBUTTONDOWN:
212 mouse_begin_x = event.button.x;
213 mouse_begin_y = event.button.y;
214 break;
215 case SDL_MOUSEBUTTONUP:
216 if (event.button.button == 3)
217 add_line(mouse_begin_x, mouse_begin_y, event.button.x,
218 event.button.y);
219 if (event.button.button == 1)
220 add_rect(mouse_begin_x, mouse_begin_y, event.button.x,
221 event.button.y);
222 break;
223 case SDL_KEYDOWN:
224 switch (event.key.keysym.sym) {
225 case 'l':
226 if (event.key.keysym.mod & KMOD_SHIFT)
227 num_lines = 0;
228 else
229 add_line(rand() % 640, rand() % 480, rand() % 640,
230 rand() % 480);
231 break;
232 case 'r':
233 if (event.key.keysym.mod & KMOD_SHIFT)
234 num_rects = 0;
235 else
236 add_rect(rand() % 640, rand() % 480, rand() % 640,
237 rand() % 480);
238 break;
239 }
240 break;
241 default:
242 break;
243 }
244 }
245 for (i = 0; i < state->num_windows; ++i) {
246 SDL_Renderer *renderer = state->renderers[i];
247 if (state->windows[i] == NULL)
248 continue;
249 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
250 SDL_RenderClear(renderer);
251
252 DrawRects(renderer);
253 DrawPoints(renderer);
254 DrawRectRectIntersections(renderer);
255 DrawLines(renderer);
256 DrawRectLineIntersections(renderer);
257
258 SDL_RenderPresent(renderer);
259 }
260#ifdef __EMSCRIPTEN__
261 if (done) {
262 emscripten_cancel_main_loop();
263 }
264#endif
265}
266
267int
268main(int argc, char *argv[])
269{
270 int i;
271 Uint32 then, now, frames;
272
273 /* Enable standard application logging */
274 SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
275
276 /* Initialize parameters */
277 num_objects = NUM_OBJECTS;
278
279 /* Initialize test framework */
280 state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
281 if (!state) {
282 return 1;
283 }
284 for (i = 1; i < argc;) {
285 int consumed;
286
287 consumed = SDLTest_CommonArg(state, i);
288 if (consumed == 0) {
289 consumed = -1;
290 if (SDL_strcasecmp(argv[i], "--blend") == 0) {
291 if (argv[i + 1]) {
292 if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
293 blendMode = SDL_BLENDMODE_NONE;
294 consumed = 2;
295 } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
296 blendMode = SDL_BLENDMODE_BLEND;
297 consumed = 2;
298 } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
299 blendMode = SDL_BLENDMODE_ADD;
300 consumed = 2;
301 } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
302 blendMode = SDL_BLENDMODE_MOD;
303 consumed = 2;
304 }
305 }
306 } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
307 cycle_color = SDL_TRUE;
308 consumed = 1;
309 } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
310 cycle_alpha = SDL_TRUE;
311 consumed = 1;
312 } else if (SDL_isdigit(*argv[i])) {
313 num_objects = SDL_atoi(argv[i]);
314 consumed = 1;
315 }
316 }
317 if (consumed < 0) {
318 static const char *options[] = { "[--blend none|blend|add|mod]", "[--cyclecolor]", "[--cyclealpha]", NULL };
319 SDLTest_CommonLogUsage(state, argv[0], options);
320 return 1;
321 }
322 i += consumed;
323 }
324 if (!SDLTest_CommonInit(state)) {
325 return 2;
326 }
327
328 /* Create the windows and initialize the renderers */
329 for (i = 0; i < state->num_windows; ++i) {
330 SDL_Renderer *renderer = state->renderers[i];
331 SDL_SetRenderDrawBlendMode(renderer, blendMode);
332 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
333 SDL_RenderClear(renderer);
334 }
335
336 srand(time(NULL));
337
338 /* Main render loop */
339 frames = 0;
340 then = SDL_GetTicks();
341 done = 0;
342
343#ifdef __EMSCRIPTEN__
344 emscripten_set_main_loop(loop, 0, 1);
345#else
346 while (!done) {
347 ++frames;
348 loop();
349 }
350#endif
351
352 SDLTest_CommonQuit(state);
353
354 /* Print out some timing information */
355 now = SDL_GetTicks();
356 if (now > then) {
357 double fps = ((double) frames * 1000) / (now - then);
358 SDL_Log("%2.2f frames per second\n", fps);
359 }
360 return 0;
361}
362
363/* vi: set ts=4 sw=4 expandtab: */
364