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