SDL sprite example (missing double buffer and similar sprite/pallette…

… as Amiga example)

src/sdl/sdl.c

@@ -1,6 +1,21 @@
 #include "SDL.h"
 #include <stdio.h>
 
+#define TICK_INTERVAL 50
+
+static Uint32 next_time;
+
+Uint32 time_left(void)
+{
+    Uint32 now;
+
+    now = SDL_GetTicks();
+    if(next_time <= now)
+        return 0;
+    else
+        return next_time - now;
+}
+
 /**
  * SDL test, not related to Amiga.
  * To be used for macro compatibility layer test.
@@ -12,10 +27,14 @@
  * Compile with:
  *   gcc sdl.c -o sdl `pkg-config --cflags --libs sdl`
  */
-int main(int argc, char *argv[]) {
-
+int main(int argc, char *argv[])
+{
+    SDL_Surface *screen, *temp, *sprite;
+    SDL_Rect rcSprite, rcSprite2;
+    int colorkey;
+
     printf("Initializing SDL.\n");
-    
+
     /* Initialize defaults, Video and Audio */
     if((SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO)==-1)) { 
         printf("Could not initialize SDL: %s.\n", SDL_GetError());
@@ -24,11 +43,45 @@ int main(int argc, char *argv[]) {
 
     printf("SDL initialized.\n");
 
-    printf("Quiting SDL.\n");
-
+    //screen = SDL_SetVideoMode(320, 256, 8, SDL_SWSURFACE | SDL_FULLSCREEN);
+    screen = SDL_SetVideoMode(320, 256, 8, SDL_SWSURFACE);
+    if (screen == NULL) {
+        fprintf(stderr, "Couldn't set 640x480x8 video mode: %s\n", SDL_GetError());
+        exit(1);
+    }
+
+    temp   = SDL_LoadBMP("Vikings_walkabout_000.bmp");
+    sprite = SDL_DisplayFormat(temp);
+    SDL_FreeSurface(temp);
+
+    colorkey = SDL_MapRGB(screen->format, 255, 0, 255);
+    SDL_SetColorKey(sprite, SDL_SRCCOLORKEY | SDL_RLEACCEL, colorkey);
+
+    rcSprite.x = 30;
+    rcSprite.y = 30;
+    rcSprite2.x = 0;
+    rcSprite2.y = 0;
+
+    short delta_move, ktr1, ktr2, color_reg;
+    next_time = SDL_GetTicks() + TICK_INTERVAL;
+    for ( ktr1 = 0, delta_move = 1; ktr1 < 6; ktr1++, delta_move = -delta_move) {
+        for ( ktr2 = 0; ktr2 < 100; ktr2++) { 
+            rcSprite.x  += delta_move;
+            rcSprite.y  += delta_move;
+            SDL_BlitSurface(sprite, NULL, screen, &rcSprite);
+            SDL_UpdateRect(screen, 0, 0, 0, 0);
+            SDL_Delay(time_left());
+            next_time += TICK_INTERVAL;
+        }
+    }
+
+    SDL_Delay(2000);
+
+    SDL_FreeSurface(sprite);
+
     /* Shutdown all subsystems */
     SDL_Quit();
-    
+
     printf("Quiting....\n");
 
     exit(0);