1/*
2  Copyright (C) 1997-2014 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#include "SDL_test_common.h"
20
21#define SWAP(typ,a,b) do{typ t=a;a=b;b=t;}while(0)
22#define NUM_OBJECTS 100
23
24static SDLTest_CommonState *state;
25static int num_objects;
26static SDL_bool cycle_color;
27static SDL_bool cycle_alpha;
28static int cycle_direction = 1;
29static int current_alpha = 255;
30static int current_color = 255;
31static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
32
33void
34DrawPoints(SDL_Renderer * renderer)
35{
36    int i;
37    int x, y;
38    SDL_Rect viewport;
39
40    /* Query the sizes */
41    SDL_RenderGetViewport(renderer, &viewport);
42
43    for (i = 0; i < num_objects * 4; ++i) {
44        /* Cycle the color and alpha, if desired */
45        if (cycle_color) {
46            current_color += cycle_direction;
47            if (current_color < 0) {
48                current_color = 0;
49                cycle_direction = -cycle_direction;
50            }
51            if (current_color > 255) {
52                current_color = 255;
53                cycle_direction = -cycle_direction;
54            }
55        }
56        if (cycle_alpha) {
57            current_alpha += cycle_direction;
58            if (current_alpha < 0) {
59                current_alpha = 0;
60                cycle_direction = -cycle_direction;
61            }
62            if (current_alpha > 255) {
63                current_alpha = 255;
64                cycle_direction = -cycle_direction;
65            }
66        }
67        SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
68                               (Uint8) current_color, (Uint8) current_alpha);
69
70        x = rand() % viewport.w;
71        y = rand() % viewport.h;
72        SDL_RenderDrawPoint(renderer, x, y);
73    }
74}
75
76#define MAX_LINES 16
77int num_lines = 0;
78SDL_Rect lines[MAX_LINES];
79static int
80add_line(int x1, int y1, int x2, int y2)
81{
82    if (num_lines >= MAX_LINES)
83        return 0;
84    if ((x1 == x2) && (y1 == y2))
85        return 0;
86
87    SDL_Log("adding line (%d, %d), (%d, %d)\n", x1, y1, x2, y2);
88    lines[num_lines].x = x1;
89    lines[num_lines].y = y1;
90    lines[num_lines].w = x2;
91    lines[num_lines].h = y2;
92
93    return ++num_lines;
94}
95
96
97void
98DrawLines(SDL_Renderer * renderer)
99{
100    int i;
101    SDL_Rect viewport;
102
103    /* Query the sizes */
104    SDL_RenderGetViewport(renderer, &viewport);
105
106    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
107
108    for (i = 0; i < num_lines; ++i) {
109        if (i == -1) {
110            SDL_RenderDrawLine(renderer, 0, 0, viewport.w - 1, viewport.h - 1);
111            SDL_RenderDrawLine(renderer, 0, viewport.h - 1, viewport.w - 1, 0);
112            SDL_RenderDrawLine(renderer, 0, viewport.h / 2, viewport.w - 1, viewport.h / 2);
113            SDL_RenderDrawLine(renderer, viewport.w / 2, 0, viewport.w / 2, viewport.h - 1);
114        } else {
115            SDL_RenderDrawLine(renderer, lines[i].x, lines[i].y, lines[i].w, lines[i].h);
116        }
117    }
118}
119
120#define MAX_RECTS 16
121int num_rects = 0;
122SDL_Rect rects[MAX_RECTS];
123static int
124add_rect(int x1, int y1, int x2, int y2)
125{
126    if (num_rects >= MAX_RECTS)
127        return 0;
128    if ((x1 == x2) || (y1 == y2))
129        return 0;
130
131    if (x1 > x2)
132        SWAP(int, x1, x2);
133    if (y1 > y2)
134        SWAP(int, y1, y2);
135
136    SDL_Log("adding rect (%d, %d), (%d, %d) [%dx%d]\n", x1, y1, x2, y2,
137           x2 - x1, y2 - y1);
138
139    rects[num_rects].x = x1;
140    rects[num_rects].y = y1;
141    rects[num_rects].w = x2 - x1;
142    rects[num_rects].h = y2 - y1;
143
144    return ++num_rects;
145}
146
147static void
148DrawRects(SDL_Renderer * renderer)
149{
150    SDL_SetRenderDrawColor(renderer, 255, 127, 0, 255);
151    SDL_RenderFillRects(renderer, rects, num_rects);
152}
153
154static void
155DrawRectLineIntersections(SDL_Renderer * renderer)
156{
157    int i, j;
158
159    SDL_SetRenderDrawColor(renderer, 0, 255, 55, 255);
160
161    for (i = 0; i < num_rects; i++)
162        for (j = 0; j < num_lines; j++) {
163            int x1, y1, x2, y2;
164            SDL_Rect r;
165
166            r = rects[i];
167            x1 = lines[j].x;
168            y1 = lines[j].y;
169            x2 = lines[j].w;
170            y2 = lines[j].h;
171
172            if (SDL_IntersectRectAndLine(&r, &x1, &y1, &x2, &y2)) {
173                SDL_RenderDrawLine(renderer, x1, y1, x2, y2);
174            }
175        }
176}
177
178static void
179DrawRectRectIntersections(SDL_Renderer * renderer)
180{
181    int i, j;
182
183    SDL_SetRenderDrawColor(renderer, 255, 200, 0, 255);
184
185    for (i = 0; i < num_rects; i++)
186        for (j = i + 1; j < num_rects; j++) {
187            SDL_Rect r;
188            if (SDL_IntersectRect(&rects[i], &rects[j], &r)) {
189                SDL_RenderFillRect(renderer, &r);
190            }
191        }
192}
193
194int
195main(int argc, char *argv[])
196{
197    int mouse_begin_x = -1, mouse_begin_y = -1;
198    int i, done;
199    SDL_Event event;
200    Uint32 then, now, frames;
201
202    /* Enable standard application logging */
203    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
204
205    /* Initialize parameters */
206    num_objects = NUM_OBJECTS;
207
208    /* Initialize test framework */
209    state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
210    if (!state) {
211        return 1;
212    }
213    for (i = 1; i < argc;) {
214        int consumed;
215
216        consumed = SDLTest_CommonArg(state, i);
217        if (consumed == 0) {
218            consumed = -1;
219            if (SDL_strcasecmp(argv[i], "--blend") == 0) {
220                if (argv[i + 1]) {
221                    if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
222                        blendMode = SDL_BLENDMODE_NONE;
223                        consumed = 2;
224                    } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
225                        blendMode = SDL_BLENDMODE_BLEND;
226                        consumed = 2;
227                    } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
228                        blendMode = SDL_BLENDMODE_ADD;
229                        consumed = 2;
230                    } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
231                        blendMode = SDL_BLENDMODE_MOD;
232                        consumed = 2;
233                    }
234                }
235            } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
236                cycle_color = SDL_TRUE;
237                consumed = 1;
238            } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
239                cycle_alpha = SDL_TRUE;
240                consumed = 1;
241            } else if (SDL_isdigit(*argv[i])) {
242                num_objects = SDL_atoi(argv[i]);
243                consumed = 1;
244            }
245        }
246        if (consumed < 0) {
247            SDL_Log("Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
248                    argv[0], SDLTest_CommonUsage(state));
249            return 1;
250        }
251        i += consumed;
252    }
253    if (!SDLTest_CommonInit(state)) {
254        return 2;
255    }
256
257    /* Create the windows and initialize the renderers */
258    for (i = 0; i < state->num_windows; ++i) {
259        SDL_Renderer *renderer = state->renderers[i];
260        SDL_SetRenderDrawBlendMode(renderer, blendMode);
261        SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
262        SDL_RenderClear(renderer);
263    }
264
265    srand(time(NULL));
266
267    /* Main render loop */
268    frames = 0;
269    then = SDL_GetTicks();
270    done = 0;
271    while (!done) {
272        /* Check for events */
273        ++frames;
274        while (SDL_PollEvent(&event)) {
275            SDLTest_CommonEvent(state, &event, &done);
276            switch (event.type) {
277            case SDL_MOUSEBUTTONDOWN:
278                mouse_begin_x = event.button.x;
279                mouse_begin_y = event.button.y;
280                break;
281            case SDL_MOUSEBUTTONUP:
282                if (event.button.button == 3)
283                    add_line(mouse_begin_x, mouse_begin_y, event.button.x,
284                             event.button.y);
285                if (event.button.button == 1)
286                    add_rect(mouse_begin_x, mouse_begin_y, event.button.x,
287                             event.button.y);
288                break;
289            case SDL_KEYDOWN:
290                switch (event.key.keysym.sym) {
291                case 'l':
292                    if (event.key.keysym.mod & KMOD_SHIFT)
293                        num_lines = 0;
294                    else
295                        add_line(rand() % 640, rand() % 480, rand() % 640,
296                                 rand() % 480);
297                    break;
298                case 'r':
299                    if (event.key.keysym.mod & KMOD_SHIFT)
300                        num_rects = 0;
301                    else
302                        add_rect(rand() % 640, rand() % 480, rand() % 640,
303                                 rand() % 480);
304                    break;
305                }
306                break;
307            default:
308                break;
309            }
310        }
311        for (i = 0; i < state->num_windows; ++i) {
312            SDL_Renderer *renderer = state->renderers[i];
313            if (state->windows[i] == NULL)
314                continue;
315            SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
316            SDL_RenderClear(renderer);
317
318            DrawRects(renderer);
319            DrawPoints(renderer);
320            DrawRectRectIntersections(renderer);
321            DrawLines(renderer);
322            DrawRectLineIntersections(renderer);
323
324            SDL_RenderPresent(renderer);
325        }
326    }
327
328    SDLTest_CommonQuit(state);
329
330    /* Print out some timing information */
331    now = SDL_GetTicks();
332    if (now > then) {
333        double fps = ((double) frames * 1000) / (now - then);
334        SDL_Log("%2.2f frames per second\n", fps);
335    }
336    return 0;
337}
338
339/* vi: set ts=4 sw=4 expandtab: */
340