1 /*
2   Copyright (C) 1997-2020 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:  Test relative mouse motion */
14 
15 #include <stdlib.h>
16 #include <stdio.h>
17 #include <time.h>
18 
19 #include "SDL_test_common.h"
20 
21 #ifdef __EMSCRIPTEN__
22 #include <emscripten/emscripten.h>
23 #endif
24 
25 static SDLTest_CommonState *state;
26 int i, done;
27 SDL_Rect rect;
28 SDL_Event event;
29 
30 static void
DrawRects(SDL_Renderer * renderer,SDL_Rect * rect)31 DrawRects(SDL_Renderer * renderer, SDL_Rect * rect)
32 {
33     SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
34     SDL_RenderFillRect(renderer, rect);
35 }
36 
37 static void
loop()38 loop(){
39     /* Check for events */
40     while (SDL_PollEvent(&event)) {
41         SDLTest_CommonEvent(state, &event, &done);
42         switch(event.type) {
43         case SDL_MOUSEMOTION:
44             {
45                 rect.x += event.motion.xrel;
46                 rect.y += event.motion.yrel;
47             }
48             break;
49         }
50     }
51     for (i = 0; i < state->num_windows; ++i) {
52         SDL_Rect viewport;
53         SDL_Renderer *renderer = state->renderers[i];
54         if (state->windows[i] == NULL)
55             continue;
56         SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0xFF);
57         SDL_RenderClear(renderer);
58 
59         /* Wrap the cursor rectangle at the screen edges to keep it visible */
60         SDL_RenderGetViewport(renderer, &viewport);
61         if (rect.x < viewport.x) rect.x += viewport.w;
62         if (rect.y < viewport.y) rect.y += viewport.h;
63         if (rect.x > viewport.x + viewport.w) rect.x -= viewport.w;
64         if (rect.y > viewport.y + viewport.h) rect.y -= viewport.h;
65 
66         DrawRects(renderer, &rect);
67 
68         SDL_RenderPresent(renderer);
69     }
70 #ifdef __EMSCRIPTEN__
71     if (done) {
72         emscripten_cancel_main_loop();
73     }
74 #endif
75 }
76 
77 int
main(int argc,char * argv[])78 main(int argc, char *argv[])
79 {
80 
81     /* Enable standard application logging */
82     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
83 
84     /* Initialize test framework */
85     state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
86     if (!state) {
87         return 1;
88     }
89     for (i = 1; i < argc; ++i) {
90         SDLTest_CommonArg(state, i);
91     }
92     if (!SDLTest_CommonInit(state)) {
93         return 2;
94     }
95 
96     /* Create the windows and initialize the renderers */
97     for (i = 0; i < state->num_windows; ++i) {
98         SDL_Renderer *renderer = state->renderers[i];
99         SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_NONE);
100         SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
101         SDL_RenderClear(renderer);
102     }
103 
104     srand((unsigned int)time(NULL));
105     if(SDL_SetRelativeMouseMode(SDL_TRUE) < 0) {
106         return 3;
107     };
108 
109     rect.x = DEFAULT_WINDOW_WIDTH / 2;
110     rect.y = DEFAULT_WINDOW_HEIGHT / 2;
111     rect.w = 10;
112     rect.h = 10;
113     /* Main render loop */
114     done = 0;
115 #ifdef __EMSCRIPTEN__
116     emscripten_set_main_loop(loop, 0, 1);
117 #else
118     while (!done) {
119         loop();
120         }
121 #endif
122     SDLTest_CommonQuit(state);
123     return 0;
124 }
125 
126 /* vi: set ts=4 sw=4 expandtab: */
127