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test/testsprite2.c
author Sunny Sachanandani <sunnysachanandani@gmail.com>
Sun, 18 Jul 2010 19:03:39 +0530
changeset 4601 cd2523c69d3e
parent 4598 66e13a224bd6
child 4884 27ab20a36eba
permissions -rw-r--r--
Resync tip to default. Using named branches is a bad idea. 
     1 /* Simple program:  Move N sprites around on the screen as fast as possible */

     2 

     3 #include <stdlib.h>

     4 #include <stdio.h>

     5 #include <time.h>

     6 

     7 #include "common.h"

     8 

     9 #define NUM_SPRITES	100

    10 #define MAX_SPEED 	1

    11 

    12 static CommonState *state;

    13 static int num_sprites;

    14 static SDL_Texture **sprites;

    15 static SDL_bool cycle_color;

    16 static SDL_bool cycle_alpha;

    17 static int cycle_direction = 1;

    18 static int current_alpha = 0;

    19 static int current_color = 0;

    20 static SDL_Rect *positions;

    21 static SDL_Rect *velocities;

    22 static int sprite_w, sprite_h;

    23 static SDL_BlendMode blendMode = SDL_BLENDMODE_MASK;

    24 static SDL_TextureScaleMode scaleMode = SDL_TEXTURESCALEMODE_NONE;

    25 

    26 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */

    27 static void

    28 quit(int rc)

    29 {

    30     if (sprites) {

    31         SDL_free(sprites);

    32     }

    33     if (positions) {

    34         SDL_free(positions);

    35     }

    36     if (velocities) {

    37         SDL_free(velocities);

    38     }

    39     CommonQuit(state);

    40     exit(rc);

    41 }

    42 

    43 int

    44 LoadSprite(char *file)

    45 {

    46     int i;

    47     SDL_Surface *temp;

    48 

    49     /* Load the sprite image */

    50     temp = SDL_LoadBMP(file);

    51     if (temp == NULL) {

    52         fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());

    53         return (-1);

    54     }

    55     sprite_w = temp->w;

    56     sprite_h = temp->h;

    57 

    58     /* Set transparent pixel as the pixel at (0,0) */

    59     if (temp->format->palette) {

    60         SDL_SetColorKey(temp, 1, *(Uint8 *) temp->pixels);

    61     } else {

    62         switch (temp->format->BitsPerPixel) {

    63         case 15:

    64             SDL_SetColorKey(temp, 1, (*(Uint16 *) temp->pixels) & 0x00007FFF);

    65             break;

    66         case 16:

    67             SDL_SetColorKey(temp, 1, *(Uint16 *) temp->pixels);

    68             break;

    69         case 24:

    70             SDL_SetColorKey(temp, 1, (*(Uint32 *) temp->pixels) & 0x00FFFFFF);

    71             break;

    72         case 32:

    73             SDL_SetColorKey(temp, 1, *(Uint32 *) temp->pixels);

    74             break;

    75         }

    76     }

    77 

    78     /* Create textures from the image */

    79     for (i = 0; i < state->num_windows; ++i) {

    80         SDL_SelectRenderer(state->windows[i]);

    81         sprites[i] = SDL_CreateTextureFromSurface(0, temp);

    82         if (!sprites[i]) {

    83 		SDL_SetColorKey(temp, 0, 0);

    84 		sprites[i] = SDL_CreateTextureFromSurface(0, temp);

    85 	}

    86         if (!sprites[i]) {

    87             fprintf(stderr, "Couldn't create texture: %s\n", SDL_GetError());

    88             SDL_FreeSurface(temp);

    89             return (-1);

    90         }

    91         SDL_SetTextureBlendMode(sprites[i], blendMode);

    92         SDL_SetTextureScaleMode(sprites[i], scaleMode);

    93     }

    94     SDL_FreeSurface(temp);

    95 

    96     /* We're ready to roll. :) */

    97     return (0);

    98 }

    99 

   100 void

   101 MoveSprites(SDL_Window * window, SDL_Texture * sprite)

   102 {

   103     int i, n;

   104     int window_w, window_h;

   105     SDL_Rect temp;

   106     SDL_Rect *position, *velocity;

   107 

   108     SDL_SelectRenderer(window);

   109 

   110     /* Query the sizes */

   111     SDL_GetWindowSize(window, &window_w, &window_h);

   112 

   113     /* Cycle the color and alpha, if desired */

   114     if (cycle_color) {

   115         current_color += cycle_direction;

   116         if (current_color < 0) {

   117             current_color = 0;

   118             cycle_direction = -cycle_direction;

   119         }

   120         if (current_color > 255) {

   121             current_color = 255;

   122             cycle_direction = -cycle_direction;

   123         }

   124         SDL_SetTextureColorMod(sprite, 255, (Uint8) current_color,

   125                                (Uint8) current_color);

   126     }

   127     if (cycle_alpha) {

   128         current_alpha += cycle_direction;

   129         if (current_alpha < 0) {

   130             current_alpha = 0;

   131             cycle_direction = -cycle_direction;

   132         }

   133         if (current_alpha > 255) {

   134             current_alpha = 255;

   135             cycle_direction = -cycle_direction;

   136         }

   137         SDL_SetTextureAlphaMod(sprite, (Uint8) current_alpha);

   138     }

   139 

   140     /* Draw a gray background */

   141     SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);

   142     SDL_RenderClear();

   143 

   144     /* Test points */

   145     SDL_SetRenderDrawColor(0xFF, 0x00, 0x00, 0xFF);

   146     SDL_RenderDrawPoint(0, 0);

   147     SDL_RenderDrawPoint(window_w-1, 0);

   148     SDL_RenderDrawPoint(0, window_h-1);

   149     SDL_RenderDrawPoint(window_w-1, window_h-1);

   150 

   151     /* Test horizontal and vertical lines */

   152     SDL_SetRenderDrawColor(0x00, 0xFF, 0x00, 0xFF);

   153     SDL_RenderDrawLine(1, 0, window_w-2, 0);

   154     SDL_RenderDrawLine(1, window_h-1, window_w-2, window_h-1);

   155     SDL_RenderDrawLine(0, 1, 0, window_h-2);

   156     SDL_RenderDrawLine(window_w-1, 1, window_w-1, window_h-2);

   157 

   158     /* Test fill and copy */

   159     SDL_SetRenderDrawColor(0xFF, 0xFF, 0xFF, 0xFF);

   160     temp.x = 1;

   161     temp.y = 1;

   162     temp.w = sprite_w;

   163     temp.h = sprite_h;

   164     SDL_RenderFillRect(&temp);

   165     SDL_RenderCopy(sprite, NULL, &temp);

   166     temp.x = window_w-sprite_w-1;

   167     temp.y = 1;

   168     temp.w = sprite_w;

   169     temp.h = sprite_h;

   170     SDL_RenderFillRect(&temp);

   171     SDL_RenderCopy(sprite, NULL, &temp);

   172     temp.x = 1;

   173     temp.y = window_h-sprite_h-1;

   174     temp.w = sprite_w;

   175     temp.h = sprite_h;

   176     SDL_RenderFillRect(&temp);

   177     SDL_RenderCopy(sprite, NULL, &temp);

   178     temp.x = window_w-sprite_w-1;

   179     temp.y = window_h-sprite_h-1;

   180     temp.w = sprite_w;

   181     temp.h = sprite_h;

   182     SDL_RenderFillRect(&temp);

   183     SDL_RenderCopy(sprite, NULL, &temp);

   184 

   185     /* Test diagonal lines */

   186     SDL_SetRenderDrawColor(0x00, 0xFF, 0x00, 0xFF);

   187     SDL_RenderDrawLine(sprite_w, sprite_h,

   188                        window_w-sprite_w-2, window_h-sprite_h-2);

   189     SDL_RenderDrawLine(window_w-sprite_w-2, sprite_h,

   190                        sprite_w, window_h-sprite_h-2);

   191 

   192     /* Move the sprite, bounce at the wall, and draw */

   193     n = 0;

   194     for (i = 0; i < num_sprites; ++i) {

   195         position = &positions[i];

   196         velocity = &velocities[i];

   197         position->x += velocity->x;

   198         if ((position->x < 0) || (position->x >= (window_w - sprite_w))) {

   199             velocity->x = -velocity->x;

   200             position->x += velocity->x;

   201         }

   202         position->y += velocity->y;

   203         if ((position->y < 0) || (position->y >= (window_h - sprite_h))) {

   204             velocity->y = -velocity->y;

   205             position->y += velocity->y;

   206         }

   207 

   208         /* Blit the sprite onto the screen */

   209         SDL_RenderCopy(sprite, NULL, position);

   210     }

   211 

   212     /* Update the screen! */

   213     SDL_RenderPresent();

   214 }

   215 

   216 int

   217 main(int argc, char *argv[])

   218 {

   219     int i, done;

   220     SDL_Event event;

   221     Uint32 then, now, frames;

   222 

   223     /* Initialize parameters */

   224     num_sprites = NUM_SPRITES;

   225 

   226     /* Initialize test framework */

   227     state = CommonCreateState(argv, SDL_INIT_VIDEO);

   228     if (!state) {

   229         return 1;

   230     }

   231     for (i = 1; i < argc;) {

   232         int consumed;

   233 

   234         consumed = CommonArg(state, i);

   235         if (consumed == 0) {

   236             consumed = -1;

   237             if (SDL_strcasecmp(argv[i], "--blend") == 0) {

   238                 if (argv[i + 1]) {

   239                     if (SDL_strcasecmp(argv[i + 1], "none") == 0) {

   240                         blendMode = SDL_BLENDMODE_NONE;

   241                         consumed = 2;

   242                     } else if (SDL_strcasecmp(argv[i + 1], "mask") == 0) {

   243                         blendMode = SDL_BLENDMODE_MASK;

   244                         consumed = 2;

   245                     } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {

   246                         blendMode = SDL_BLENDMODE_BLEND;

   247                         consumed = 2;

   248                     } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {

   249                         blendMode = SDL_BLENDMODE_ADD;

   250                         consumed = 2;

   251                     } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {

   252                         blendMode = SDL_BLENDMODE_MOD;

   253                         consumed = 2;

   254                     }

   255                 }

   256             } else if (SDL_strcasecmp(argv[i], "--scale") == 0) {

   257                 if (argv[i + 1]) {

   258                     if (SDL_strcasecmp(argv[i + 1], "none") == 0) {

   259                         scaleMode = SDL_TEXTURESCALEMODE_NONE;

   260                         consumed = 2;

   261                     } else if (SDL_strcasecmp(argv[i + 1], "fast") == 0) {

   262                         scaleMode = SDL_TEXTURESCALEMODE_FAST;

   263                         consumed = 2;

   264                     } else if (SDL_strcasecmp(argv[i + 1], "slow") == 0) {

   265                         scaleMode = SDL_TEXTURESCALEMODE_SLOW;

   266                         consumed = 2;

   267                     } else if (SDL_strcasecmp(argv[i + 1], "best") == 0) {

   268                         scaleMode = SDL_TEXTURESCALEMODE_BEST;

   269                         consumed = 2;

   270                     }

   271                 }

   272             } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {

   273                 cycle_color = SDL_TRUE;

   274                 consumed = 1;

   275             } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {

   276                 cycle_alpha = SDL_TRUE;

   277                 consumed = 1;

   278             } else if (SDL_isdigit(*argv[i])) {

   279                 num_sprites = SDL_atoi(argv[i]);

   280                 consumed = 1;

   281             }

   282         }

   283         if (consumed < 0) {

   284             fprintf(stderr,

   285                     "Usage: %s %s [--blend none|mask|blend|add|mod] [--scale none|fast|slow|best] [--cyclecolor] [--cyclealpha]\n",

   286                     argv[0], CommonUsage(state));

   287             quit(1);

   288         }

   289         i += consumed;

   290     }

   291     if (!CommonInit(state)) {

   292         quit(2);

   293     }

   294 

   295     /* Create the windows, initialize the renderers, and load the textures */

   296     sprites =

   297         (SDL_Texture **) SDL_malloc(state->num_windows * sizeof(*sprites));

   298     if (!sprites) {

   299         fprintf(stderr, "Out of memory!\n");

   300         quit(2);

   301     }

   302     for (i = 0; i < state->num_windows; ++i) {

   303         SDL_SelectRenderer(state->windows[i]);

   304         SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);

   305         SDL_RenderClear();

   306     }

   307     if (LoadSprite("icon.bmp") < 0) {

   308         quit(2);

   309     }

   310 

   311     /* Allocate memory for the sprite info */

   312     positions = (SDL_Rect *) SDL_malloc(num_sprites * sizeof(SDL_Rect));

   313     velocities = (SDL_Rect *) SDL_malloc(num_sprites * sizeof(SDL_Rect));

   314     if (!positions || !velocities) {

   315         fprintf(stderr, "Out of memory!\n");

   316         quit(2);

   317     }

   318     srand(time(NULL));

   319     if (scaleMode != SDL_TEXTURESCALEMODE_NONE) {

   320         sprite_w += sprite_w / 2;

   321         sprite_h += sprite_h / 2;

   322     }

   323     for (i = 0; i < num_sprites; ++i) {

   324         positions[i].x = rand() % (state->window_w - sprite_w);

   325         positions[i].y = rand() % (state->window_h - sprite_h);

   326         positions[i].w = sprite_w;

   327         positions[i].h = sprite_h;

   328         velocities[i].x = 0;

   329         velocities[i].y = 0;

   330         while (!velocities[i].x && !velocities[i].y) {

   331             velocities[i].x = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;

   332             velocities[i].y = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;

   333         }

   334     }

   335 

   336     /* Main render loop */

   337     frames = 0;

   338     then = SDL_GetTicks();

   339     done = 0;

   340     while (!done) {

   341         /* Check for events */

   342         ++frames;

   343         while (SDL_PollEvent(&event)) {

   344             CommonEvent(state, &event, &done);

   345             switch (event.type) {

   346             case SDL_WINDOWEVENT:

   347                 switch (event.window.event) {

   348                 case SDL_WINDOWEVENT_EXPOSED:

   349                     SDL_SelectRenderer(SDL_GetWindowFromID(event.window.windowID));

   350                     SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);

   351                     SDL_RenderClear();

   352                     break;

   353                 }

   354                 break;

   355             default:

   356                 break;

   357             }

   358         }

   359         for (i = 0; i < state->num_windows; ++i) {

   360             MoveSprites(state->windows[i], sprites[i]);

   361         }

   362     }

   363 

   364     /* Print out some timing information */

   365     now = SDL_GetTicks();

   366     if (now > then) {

   367         double fps = ((double) frames * 1000) / (now - then);

   368         printf("%2.2f frames per second\n", fps);

   369     }

   370     quit(0);

   371 }

   372 

   373 /* vi: set ts=4 sw=4 expandtab: */
SDL