text: /*
    Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely.
  */
  
  /* Simple program:  draw as many random objects on the screen as possible */
  
  #include <stdlib.h>
  #include <stdio.h>
  #include <time.h>
  
  #ifdef __EMSCRIPTEN__
  #include <emscripten/emscripten.h>
  #endif
  
  #include "SDL_test_common.h"
  
  #define NUM_OBJECTS 100
  
  static SDLTest_CommonState *state;
  static int num_objects;
  static SDL_bool cycle_color;
  static SDL_bool cycle_alpha;
  static int cycle_direction = 1;
  static int current_alpha = 255;
  static int current_color = 255;
  static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
  
  int done;
  
  void
  DrawPoints(SDL_Renderer * renderer)
  {
      int i;
      int x, y;
      SDL_Rect viewport;
  
      /* Query the sizes */
      SDL_RenderGetViewport(renderer, &viewport);
  
      for (i = 0; i < num_objects * 4; ++i) {
          /* Cycle the color and alpha, if desired */
          if (cycle_color) {
              current_color += cycle_direction;
              if (current_color < 0) {
                  current_color = 0;
                  cycle_direction = -cycle_direction;
              }
              if (current_color > 255) {
                  current_color = 255;
                  cycle_direction = -cycle_direction;
              }
          }
          if (cycle_alpha) {
              current_alpha += cycle_direction;
              if (current_alpha < 0) {
                  current_alpha = 0;
                  cycle_direction = -cycle_direction;
              }
              if (current_alpha > 255) {
                  current_alpha = 255;
                  cycle_direction = -cycle_direction;
              }
          }
          SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
                                 (Uint8) current_color, (Uint8) current_alpha);
  
          x = rand() % viewport.w;
          y = rand() % viewport.h;
          SDL_RenderDrawPoint(renderer, x, y);
      }
  }
  
  void
  DrawLines(SDL_Renderer * renderer)
  {
      int i;
      int x1, y1, x2, y2;
      SDL_Rect viewport;
  
      /* Query the sizes */
      SDL_RenderGetViewport(renderer, &viewport);
  
      for (i = 0; i < num_objects; ++i) {
          /* Cycle the color and alpha, if desired */
          if (cycle_color) {
              current_color += cycle_direction;
              if (current_color < 0) {
                  current_color = 0;
                  cycle_direction = -cycle_direction;
              }
              if (current_color > 255) {
                  current_color = 255;
                  cycle_direction = -cycle_direction;
              }
          }
          if (cycle_alpha) {
              current_alpha += cycle_direction;
              if (current_alpha < 0) {
                  current_alpha = 0;
                  cycle_direction = -cycle_direction;
              }
              if (current_alpha > 255) {
                  current_alpha = 255;
                  cycle_direction = -cycle_direction;
              }
          }
          SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
                                 (Uint8) current_color, (Uint8) current_alpha);
  
          if (i == 0) {
              SDL_RenderDrawLine(renderer, 0, 0, viewport.w - 1, viewport.h - 1);
              SDL_RenderDrawLine(renderer, 0, viewport.h - 1, viewport.w - 1, 0);
              SDL_RenderDrawLine(renderer, 0, viewport.h / 2, viewport.w - 1, viewport.h / 2);
              SDL_RenderDrawLine(renderer, viewport.w / 2, 0, viewport.w / 2, viewport.h - 1);
          } else {
              x1 = (rand() % (viewport.w*2)) - viewport.w;
              x2 = (rand() % (viewport.w*2)) - viewport.w;
              y1 = (rand() % (viewport.h*2)) - viewport.h;
              y2 = (rand() % (viewport.h*2)) - viewport.h;
              SDL_RenderDrawLine(renderer, x1, y1, x2, y2);
          }
      }
  }
  
  void
  DrawRects(SDL_Renderer * renderer)
  {
      int i;
      SDL_Rect rect;
      SDL_Rect viewport;
  
      /* Query the sizes */
      SDL_RenderGetViewport(renderer, &viewport);
  
      for (i = 0; i < num_objects / 4; ++i) {
          /* Cycle the color and alpha, if desired */
          if (cycle_color) {
              current_color += cycle_direction;
              if (current_color < 0) {
                  current_color = 0;
                  cycle_direction = -cycle_direction;
              }
              if (current_color > 255) {
                  current_color = 255;
                  cycle_direction = -cycle_direction;
              }
          }
          if (cycle_alpha) {
              current_alpha += cycle_direction;
              if (current_alpha < 0) {
                  current_alpha = 0;
                  cycle_direction = -cycle_direction;
              }
              if (current_alpha > 255) {
                  current_alpha = 255;
                  cycle_direction = -cycle_direction;
              }
          }
          SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
                                 (Uint8) current_color, (Uint8) current_alpha);
  
          rect.w = rand() % (viewport.h / 2);
          rect.h = rand() % (viewport.h / 2);
          rect.x = (rand() % (viewport.w*2) - viewport.w) - (rect.w / 2);
          rect.y = (rand() % (viewport.h*2) - viewport.h) - (rect.h / 2);
          SDL_RenderFillRect(renderer, &rect);
      }
  }
  
  void
  loop()
  {
      int i;
      SDL_Event event;
  
      /* Check for events */
      while (SDL_PollEvent(&event)) {
          SDLTest_CommonEvent(state, &event, &done);
      }
      for (i = 0; i < state->num_windows; ++i) {
          SDL_Renderer *renderer = state->renderers[i];
          if (state->windows[i] == NULL)
              continue;
          SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
          SDL_RenderClear(renderer);
  
          DrawRects(renderer);
          DrawLines(renderer);
          DrawPoints(renderer);
  
          SDL_RenderPresent(renderer);
      }
  #ifdef __EMSCRIPTEN__
      if (done) {
          emscripten_cancel_main_loop();
      }
  #endif
  }
  
  int
  main(int argc, char *argv[])
  {
      int i;
      Uint32 then, now, frames;
  
  	/* Enable standard application logging */
  	SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
  
      /* Initialize parameters */
      num_objects = NUM_OBJECTS;
  
      /* Initialize test framework */
      state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
      if (!state) {
          return 1;
      }
      for (i = 1; i < argc;) {
          int consumed;
  
          consumed = SDLTest_CommonArg(state, i);
          if (consumed == 0) {
              consumed = -1;
              if (SDL_strcasecmp(argv[i], "--blend") == 0) {
                  if (argv[i + 1]) {
                      if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
                          blendMode = SDL_BLENDMODE_NONE;
                          consumed = 2;
                      } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
                          blendMode = SDL_BLENDMODE_BLEND;
                          consumed = 2;
                      } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
                          blendMode = SDL_BLENDMODE_ADD;
                          consumed = 2;
                      } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
                          blendMode = SDL_BLENDMODE_MOD;
                          consumed = 2;
                      }
                  }
              } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
                  cycle_color = SDL_TRUE;
                  consumed = 1;
              } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
                  cycle_alpha = SDL_TRUE;
                  consumed = 1;
              } else if (SDL_isdigit(*argv[i])) {
                  num_objects = SDL_atoi(argv[i]);
                  consumed = 1;
              }
          }
          if (consumed < 0) {
              SDL_Log("Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
                      argv[0], SDLTest_CommonUsage(state));
              return 1;
          }
          i += consumed;
      }
      if (!SDLTest_CommonInit(state)) {
          return 2;
      }
  
      /* Create the windows and initialize the renderers */
      for (i = 0; i < state->num_windows; ++i) {
          SDL_Renderer *renderer = state->renderers[i];
          SDL_SetRenderDrawBlendMode(renderer, blendMode);
          SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
          SDL_RenderClear(renderer);
      }
  
      srand((unsigned int)time(NULL));
  
      /* Main render loop */
      frames = 0;
      then = SDL_GetTicks();
      done = 0;
  
  #ifdef __EMSCRIPTEN__
      emscripten_set_main_loop(loop, 0, 1);
  #else
      while (!done) {
          ++frames;
          loop();
          }
  #endif
  
  
      SDLTest_CommonQuit(state);
  
      /* Print out some timing information */
      now = SDL_GetTicks();
      if (now > then) {
          double fps = ((double) frames * 1000) / (now - then);
          SDL_Log("%2.2f frames per second\n", fps);
      }
      return 0;
  }
  
  /* vi: set ts=4 sw=4 expandtab: */
  