test/testdraw2.c
author David Ludwig <dludwig@pobox.com>
Tue, 12 Feb 2013 12:57:06 -0500
changeset 8424 3cf9501008f1
parent 5535 96594ac5fd1a
child 6785 c094c438c0a6
permissions -rw-r--r--
WinRT: fixed bug: SDL_CreateWindow wouldn't work after an initial window was created + destroyed
     1 /*
     2   Copyright (C) 1997-2011 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 "common.h"
    20 
    21 #define NUM_OBJECTS	100
    22 
    23 static CommonState *state;
    24 static int num_objects;
    25 static SDL_bool cycle_color;
    26 static SDL_bool cycle_alpha;
    27 static int cycle_direction = 1;
    28 static int current_alpha = 255;
    29 static int current_color = 255;
    30 static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
    31 
    32 void
    33 DrawPoints(SDL_Renderer * renderer)
    34 {
    35     int i;
    36     int x, y;
    37     SDL_Rect viewport;
    38 
    39     /* Query the sizes */
    40     SDL_RenderGetViewport(renderer, &viewport);
    41 
    42     for (i = 0; i < num_objects * 4; ++i) {
    43         /* Cycle the color and alpha, if desired */
    44         if (cycle_color) {
    45             current_color += cycle_direction;
    46             if (current_color < 0) {
    47                 current_color = 0;
    48                 cycle_direction = -cycle_direction;
    49             }
    50             if (current_color > 255) {
    51                 current_color = 255;
    52                 cycle_direction = -cycle_direction;
    53             }
    54         }
    55         if (cycle_alpha) {
    56             current_alpha += cycle_direction;
    57             if (current_alpha < 0) {
    58                 current_alpha = 0;
    59                 cycle_direction = -cycle_direction;
    60             }
    61             if (current_alpha > 255) {
    62                 current_alpha = 255;
    63                 cycle_direction = -cycle_direction;
    64             }
    65         }
    66         SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
    67                                (Uint8) current_color, (Uint8) current_alpha);
    68 
    69         x = rand() % viewport.w;
    70         y = rand() % viewport.h;
    71         SDL_RenderDrawPoint(renderer, x, y);
    72     }
    73 }
    74 
    75 void
    76 DrawLines(SDL_Renderer * renderer)
    77 {
    78     int i;
    79     int x1, y1, x2, y2;
    80     SDL_Rect viewport;
    81 
    82     /* Query the sizes */
    83     SDL_RenderGetViewport(renderer, &viewport);
    84 
    85     for (i = 0; i < num_objects; ++i) {
    86         /* Cycle the color and alpha, if desired */
    87         if (cycle_color) {
    88             current_color += cycle_direction;
    89             if (current_color < 0) {
    90                 current_color = 0;
    91                 cycle_direction = -cycle_direction;
    92             }
    93             if (current_color > 255) {
    94                 current_color = 255;
    95                 cycle_direction = -cycle_direction;
    96             }
    97         }
    98         if (cycle_alpha) {
    99             current_alpha += cycle_direction;
   100             if (current_alpha < 0) {
   101                 current_alpha = 0;
   102                 cycle_direction = -cycle_direction;
   103             }
   104             if (current_alpha > 255) {
   105                 current_alpha = 255;
   106                 cycle_direction = -cycle_direction;
   107             }
   108         }
   109         SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
   110                                (Uint8) current_color, (Uint8) current_alpha);
   111 
   112         if (i == 0) {
   113             SDL_RenderDrawLine(renderer, 0, 0, viewport.w - 1, viewport.h - 1);
   114             SDL_RenderDrawLine(renderer, 0, viewport.h - 1, viewport.w - 1, 0);
   115             SDL_RenderDrawLine(renderer, 0, viewport.h / 2, viewport.w - 1, viewport.h / 2);
   116             SDL_RenderDrawLine(renderer, viewport.w / 2, 0, viewport.w / 2, viewport.h - 1);
   117         } else {
   118             x1 = (rand() % (viewport.w*2)) - viewport.w;
   119             x2 = (rand() % (viewport.w*2)) - viewport.w;
   120             y1 = (rand() % (viewport.h*2)) - viewport.h;
   121             y2 = (rand() % (viewport.h*2)) - viewport.h;
   122             SDL_RenderDrawLine(renderer, x1, y1, x2, y2);
   123         }
   124     }
   125 }
   126 
   127 void
   128 DrawRects(SDL_Renderer * renderer)
   129 {
   130     int i;
   131     SDL_Rect rect;
   132     SDL_Rect viewport;
   133 
   134     /* Query the sizes */
   135     SDL_RenderGetViewport(renderer, &viewport);
   136 
   137     for (i = 0; i < num_objects / 4; ++i) {
   138         /* Cycle the color and alpha, if desired */
   139         if (cycle_color) {
   140             current_color += cycle_direction;
   141             if (current_color < 0) {
   142                 current_color = 0;
   143                 cycle_direction = -cycle_direction;
   144             }
   145             if (current_color > 255) {
   146                 current_color = 255;
   147                 cycle_direction = -cycle_direction;
   148             }
   149         }
   150         if (cycle_alpha) {
   151             current_alpha += cycle_direction;
   152             if (current_alpha < 0) {
   153                 current_alpha = 0;
   154                 cycle_direction = -cycle_direction;
   155             }
   156             if (current_alpha > 255) {
   157                 current_alpha = 255;
   158                 cycle_direction = -cycle_direction;
   159             }
   160         }
   161         SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
   162                                (Uint8) current_color, (Uint8) current_alpha);
   163 
   164         rect.w = rand() % (viewport.h / 2);
   165         rect.h = rand() % (viewport.h / 2);
   166         rect.x = (rand() % (viewport.w*2) - viewport.w) - (rect.w / 2);
   167         rect.y = (rand() % (viewport.h*2) - viewport.h) - (rect.h / 2);
   168         SDL_RenderFillRect(renderer, &rect);
   169     }
   170 }
   171 
   172 int
   173 main(int argc, char *argv[])
   174 {
   175     int i, done;
   176     SDL_Event event;
   177     Uint32 then, now, frames;
   178 
   179     /* Initialize parameters */
   180     num_objects = NUM_OBJECTS;
   181 
   182     /* Initialize test framework */
   183     state = CommonCreateState(argv, SDL_INIT_VIDEO);
   184     if (!state) {
   185         return 1;
   186     }
   187     for (i = 1; i < argc;) {
   188         int consumed;
   189 
   190         consumed = CommonArg(state, i);
   191         if (consumed == 0) {
   192             consumed = -1;
   193             if (SDL_strcasecmp(argv[i], "--blend") == 0) {
   194                 if (argv[i + 1]) {
   195                     if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
   196                         blendMode = SDL_BLENDMODE_NONE;
   197                         consumed = 2;
   198                     } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
   199                         blendMode = SDL_BLENDMODE_BLEND;
   200                         consumed = 2;
   201                     } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
   202                         blendMode = SDL_BLENDMODE_ADD;
   203                         consumed = 2;
   204                     } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
   205                         blendMode = SDL_BLENDMODE_MOD;
   206                         consumed = 2;
   207                     }
   208                 }
   209             } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
   210                 cycle_color = SDL_TRUE;
   211                 consumed = 1;
   212             } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
   213                 cycle_alpha = SDL_TRUE;
   214                 consumed = 1;
   215             } else if (SDL_isdigit(*argv[i])) {
   216                 num_objects = SDL_atoi(argv[i]);
   217                 consumed = 1;
   218             }
   219         }
   220         if (consumed < 0) {
   221             fprintf(stderr,
   222                     "Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
   223                     argv[0], CommonUsage(state));
   224             return 1;
   225         }
   226         i += consumed;
   227     }
   228     if (!CommonInit(state)) {
   229         return 2;
   230     }
   231 
   232     /* Create the windows and initialize the renderers */
   233     for (i = 0; i < state->num_windows; ++i) {
   234         SDL_Renderer *renderer = state->renderers[i];
   235         SDL_SetRenderDrawBlendMode(renderer, blendMode);
   236         SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
   237         SDL_RenderClear(renderer);
   238     }
   239 
   240     srand((unsigned int)time(NULL));
   241 
   242     /* Main render loop */
   243     frames = 0;
   244     then = SDL_GetTicks();
   245     done = 0;
   246     while (!done) {
   247         /* Check for events */
   248         ++frames;
   249         while (SDL_PollEvent(&event)) {
   250             CommonEvent(state, &event, &done);
   251         }
   252         for (i = 0; i < state->num_windows; ++i) {
   253             SDL_Renderer *renderer = state->renderers[i];
   254             SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
   255             SDL_RenderClear(renderer);
   256 
   257             DrawRects(renderer);
   258             DrawLines(renderer);
   259             DrawPoints(renderer);
   260 
   261             SDL_RenderPresent(renderer);
   262         }
   263     }
   264 
   265     CommonQuit(state);
   266 
   267     /* Print out some timing information */
   268     now = SDL_GetTicks();
   269     if (now > then) {
   270         double fps = ((double) frames * 1000) / (now - then);
   271         printf("%2.2f frames per second\n", fps);
   272     }
   273     return 0;
   274 }
   275 
   276 /* vi: set ts=4 sw=4 expandtab: */