test/testintersections.c
author Ryan C. Gordon <icculus@icculus.org>
Sat, 07 Jan 2017 22:24:45 -0500
changeset 10782 1de6d4633ee6
parent 10737 3406a0f8b041
child 11811 5d94cb6b24d3
permissions -rw-r--r--
Fixed a bunch of compiler warnings in the test code.
     1 /*
     2   Copyright (C) 1997-2017 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 
    28 static SDLTest_CommonState *state;
    29 static int num_objects;
    30 static SDL_bool cycle_color;
    31 static SDL_bool cycle_alpha;
    32 static int cycle_direction = 1;
    33 static int current_alpha = 255;
    34 static int current_color = 255;
    35 static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
    36 
    37 int mouse_begin_x = -1, mouse_begin_y = -1;
    38 int done;
    39 
    40 void
    41 DrawPoints(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
    84 int num_lines = 0;
    85 SDL_Rect lines[MAX_LINES];
    86 static int
    87 add_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 
   104 void
   105 DrawLines(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
   128 int num_rects = 0;
   129 SDL_Rect rects[MAX_RECTS];
   130 static int
   131 add_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 
   154 static void
   155 DrawRects(SDL_Renderer * renderer)
   156 {
   157     SDL_SetRenderDrawColor(renderer, 255, 127, 0, 255);
   158     SDL_RenderFillRects(renderer, rects, num_rects);
   159 }
   160 
   161 static void
   162 DrawRectLineIntersections(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 
   185 static void
   186 DrawRectRectIntersections(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 
   201 void
   202 loop()
   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 
   267 int
   268 main(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             SDL_Log("Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
   319                     argv[0], SDLTest_CommonUsage(state));
   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: */