add demo for sprites

demos/demo/demo_screen2.h

@@ -1,3 +1,5 @@
+#include <font8x8.h>
+
 void demo_screen2() {
    tms_init_regs(SCREEN2_TABLE);
 
@@ -28,5 +30,21 @@ void demo_screen2() {
 
    screen2_plot_mode = PLOT_MODE_SET;
 
-   //vti_ellipse_rect(7,9,202,167);
+   // define sprites using bitmap fonts
+   tms_copy_to_vram(&FONT[64*8], 32*8, TMS_SPRITE_PATTERNS);
+
+   // set 16x16 sprites
+   tms_set_sprite_double_size(1);
+
+   // set double pixel sprites
+   tms_set_sprite_magnification(1);
+
+   tms_sprite spr;
+   for(byte t=0;t<32;t++) {
+      spr.x = 10 + t*32;
+      spr.y =  5 + t*32;
+      spr.name = t;
+      spr.color = t+1;
+      tms_set_sprite(t, &spr);
+   }
 }