mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-30 06:50:39 +00:00
81 lines
1.7 KiB
C
81 lines
1.7 KiB
C
|
|
/*
|
|
Sprite demo.
|
|
Animate all 64 hardware sprites.
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
// include NESLIB header
|
|
#include "neslib.h"
|
|
|
|
// link the pattern table into CHR ROM
|
|
//#link "chr_generic.s"
|
|
|
|
/*{pal:"nes",layout:"nes"}*/
|
|
const char PALETTE[32] = {
|
|
0x03, // screen color
|
|
|
|
0x11,0x30,0x27,0x0, // background palette 0
|
|
0x1c,0x20,0x2c,0x0, // background palette 1
|
|
0x00,0x10,0x20,0x0, // background palette 2
|
|
0x06,0x16,0x26,0x0, // background palette 3
|
|
|
|
0x16,0x35,0x24,0x0, // sprite palette 0
|
|
0x00,0x37,0x25,0x0, // sprite palette 1
|
|
0x0d,0x2d,0x3a,0x0, // sprite palette 2
|
|
0x0d,0x27,0x2a // sprite palette 3
|
|
};
|
|
|
|
// setup PPU and tables
|
|
void setup_graphics() {
|
|
// clear sprites
|
|
oam_clear();
|
|
// set palette colors
|
|
pal_all(PALETTE);
|
|
// turn on PPU
|
|
ppu_on_all();
|
|
}
|
|
|
|
// number of actors
|
|
#define NUM_ACTORS 64
|
|
|
|
// actor x/y positions
|
|
byte actor_x[NUM_ACTORS];
|
|
byte actor_y[NUM_ACTORS];
|
|
// actor x/y deltas per frame (signed)
|
|
sbyte actor_dx[NUM_ACTORS];
|
|
sbyte actor_dy[NUM_ACTORS];
|
|
|
|
// main program
|
|
void main() {
|
|
char i;
|
|
char oam_id;
|
|
|
|
setup_graphics();
|
|
// initialize actors with random values
|
|
for (i=0; i<NUM_ACTORS; i++) {
|
|
actor_x[i] = rand();
|
|
actor_y[i] = rand();
|
|
actor_dx[i] = (rand() & 7) - 3;
|
|
actor_dy[i] = (rand() & 7) - 3;
|
|
}
|
|
// loop forever
|
|
while (1) {
|
|
// start with OAMid/sprite 0
|
|
oam_id = 0;
|
|
// draw and move all actors
|
|
for (i=0; i<NUM_ACTORS; i++) {
|
|
oam_id = oam_spr(actor_x[i], actor_y[i], i, i, oam_id);
|
|
actor_x[i] += actor_dx[i];
|
|
actor_y[i] += actor_dy[i];
|
|
}
|
|
// hide rest of sprites
|
|
// if we haven't wrapped oam_id around to 0
|
|
if (oam_id!=0) oam_hide_rest(oam_id);
|
|
// wait for next frame
|
|
ppu_wait_frame();
|
|
}
|
|
}
|