test/teststreaming.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 11 Feb 2011 12:24:59 -0800
changeset 5254 f650566b2f51
child 5255 b0f5108fda60
permissions -rw-r--r--
Added a very simple example of texture streaming
     1 /********************************************************************************
     2  *                                                                              *
     3  * Running moose :) Coded by Mike Gorchak.                                      *
     4  *                                                                              *
     5  ********************************************************************************/
     6 
     7 #include <stdlib.h>
     8 #include <stdio.h>
     9 #include <string.h>
    10 
    11 #include "SDL.h"
    12 
    13 #define MOOSEPIC_W 64
    14 #define MOOSEPIC_H 88
    15 
    16 #define MOOSEFRAME_SIZE (MOOSEPIC_W * MOOSEPIC_H)
    17 #define MOOSEFRAMES_COUNT 10
    18 
    19 SDL_Color MooseColors[84] = {
    20     {49, 49, 49}
    21     , {66, 24, 0}
    22     , {66, 33, 0}
    23     , {66, 66, 66}
    24     ,
    25     {66, 115, 49}
    26     , {74, 33, 0}
    27     , {74, 41, 16}
    28     , {82, 33, 8}
    29     ,
    30     {82, 41, 8}
    31     , {82, 49, 16}
    32     , {82, 82, 82}
    33     , {90, 41, 8}
    34     ,
    35     {90, 41, 16}
    36     , {90, 57, 24}
    37     , {99, 49, 16}
    38     , {99, 66, 24}
    39     ,
    40     {99, 66, 33}
    41     , {99, 74, 33}
    42     , {107, 57, 24}
    43     , {107, 82, 41}
    44     ,
    45     {115, 57, 33}
    46     , {115, 66, 33}
    47     , {115, 66, 41}
    48     , {115, 74, 0}
    49     ,
    50     {115, 90, 49}
    51     , {115, 115, 115}
    52     , {123, 82, 0}
    53     , {123, 99, 57}
    54     ,
    55     {132, 66, 41}
    56     , {132, 74, 41}
    57     , {132, 90, 8}
    58     , {132, 99, 33}
    59     ,
    60     {132, 99, 66}
    61     , {132, 107, 66}
    62     , {140, 74, 49}
    63     , {140, 99, 16}
    64     ,
    65     {140, 107, 74}
    66     , {140, 115, 74}
    67     , {148, 107, 24}
    68     , {148, 115, 82}
    69     ,
    70     {148, 123, 74}
    71     , {148, 123, 90}
    72     , {156, 115, 33}
    73     , {156, 115, 90}
    74     ,
    75     {156, 123, 82}
    76     , {156, 132, 82}
    77     , {156, 132, 99}
    78     , {156, 156, 156}
    79     ,
    80     {165, 123, 49}
    81     , {165, 123, 90}
    82     , {165, 132, 82}
    83     , {165, 132, 90}
    84     ,
    85     {165, 132, 99}
    86     , {165, 140, 90}
    87     , {173, 132, 57}
    88     , {173, 132, 99}
    89     ,
    90     {173, 140, 107}
    91     , {173, 140, 115}
    92     , {173, 148, 99}
    93     , {173, 173, 173}
    94     ,
    95     {181, 140, 74}
    96     , {181, 148, 115}
    97     , {181, 148, 123}
    98     , {181, 156, 107}
    99     ,
   100     {189, 148, 123}
   101     , {189, 156, 82}
   102     , {189, 156, 123}
   103     , {189, 156, 132}
   104     ,
   105     {189, 189, 189}
   106     , {198, 156, 123}
   107     , {198, 165, 132}
   108     , {206, 165, 99}
   109     ,
   110     {206, 165, 132}
   111     , {206, 173, 140}
   112     , {206, 206, 206}
   113     , {214, 173, 115}
   114     ,
   115     {214, 173, 140}
   116     , {222, 181, 148}
   117     , {222, 189, 132}
   118     , {222, 189, 156}
   119     ,
   120     {222, 222, 222}
   121     , {231, 198, 165}
   122     , {231, 231, 231}
   123     , {239, 206, 173}
   124 };
   125 
   126 Uint8 MooseFrames[MOOSEFRAMES_COUNT][MOOSEFRAME_SIZE];
   127 
   128 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
   129 static void
   130 quit(int rc)
   131 {
   132     SDL_Quit();
   133     exit(rc);
   134 }
   135 
   136 static void UpdateTexture(SDL_Texture *texture, int frame)
   137 {
   138     SDL_Color *color;
   139     Uint8 *src;
   140     Uint32 *dst;
   141     int row, col;
   142     void *pixels;
   143     int pitch;
   144 
   145     if (SDL_LockTexture(texture, NULL, &pixels, &pitch) < 0) {
   146         fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
   147         quit(5);
   148     }
   149     src = MooseFrames[frame];
   150     for (row = 0; row < MOOSEPIC_H; ++row) {
   151         dst = (Uint32*)((Uint8*)pixels + row * pitch);
   152         for (col = 0; col < MOOSEPIC_W; ++col) {
   153             color = &MooseColors[*src++];
   154             *dst++ = (0xFF000000|(color->r<<16)|(color->g<<8)|color->b);
   155         }
   156     }
   157     SDL_UnlockTexture(texture);
   158 }
   159 
   160 int
   161 main(int argc, char **argv)
   162 {
   163     SDL_Window *window;
   164     SDL_Renderer *renderer;
   165     SDL_RWops *handle;
   166     SDL_Texture *MooseTexture;
   167     SDL_Event event;
   168     SDL_bool done = SDL_FALSE;
   169     int frame;
   170 
   171     if (SDL_Init(SDL_INIT_VIDEO) < 0) {
   172         fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
   173         return 1;
   174     }
   175 
   176     /* load the moose images */
   177     handle = SDL_RWFromFile("moose.dat", "rb");
   178     if (handle == NULL) {
   179         fprintf(stderr, "Can't find the file moose.dat !\n");
   180         quit(2);
   181     }
   182     SDL_RWread(handle, MooseFrames, MOOSEFRAME_SIZE, MOOSEFRAMES_COUNT);
   183     SDL_RWclose(handle);
   184 
   185 
   186     /* Create the window and renderer */
   187     window = SDL_CreateWindow("Happy Moose",
   188                               SDL_WINDOWPOS_UNDEFINED,
   189                               SDL_WINDOWPOS_UNDEFINED,
   190                               MOOSEPIC_W*4, MOOSEPIC_H*4,
   191                               SDL_WINDOW_SHOWN|SDL_WINDOW_RESIZABLE);
   192     if (!window) {
   193         fprintf(stderr, "Couldn't set create window: %s\n", SDL_GetError());
   194         quit(3);
   195     }
   196 
   197     renderer = SDL_CreateRenderer(window, -1, 0);
   198     if (!renderer) {
   199         fprintf(stderr, "Couldn't set create renderer: %s\n", SDL_GetError());
   200         quit(4);
   201     }
   202 
   203     MooseTexture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, MOOSEPIC_W, MOOSEPIC_H);
   204     if (!MooseTexture) {
   205         fprintf(stderr, "Couldn't set create texture: %s\n", SDL_GetError());
   206         quit(5);
   207     }
   208 
   209     /* Loop, waiting for QUIT or the escape key */
   210     frame = 0;
   211     while (!done) {
   212         while (SDL_PollEvent(&event)) {
   213             switch (event.type) {
   214             case SDL_KEYDOWN:
   215                 if (event.key.keysym.sym == SDLK_ESCAPE) {
   216                     done = SDL_TRUE;
   217                 }
   218                 break;
   219             case SDL_QUIT:
   220                 done = SDL_TRUE;
   221                 break;
   222             }
   223         }
   224 
   225         frame = (frame + 1) % MOOSEFRAMES_COUNT;
   226         UpdateTexture(MooseTexture, frame);
   227 
   228         SDL_RenderClear(renderer);
   229         SDL_RenderCopy(renderer, MooseTexture, NULL, NULL);
   230         SDL_RenderPresent(renderer);
   231     }
   232     SDL_DestroyRenderer(renderer);
   233 
   234     quit(0);
   235     return 0;
   236 }
   237 
   238 /* vi: set ts=4 sw=4 expandtab: */