73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
// ported from
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// https://odensskjegg.home.blog/2018/12/29/recreating-the-commodore-64-user-guide-code-samples-in-cc65-part-three-sprites/
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#include <stdio.h>
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#include <stdlib.h>
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#include <conio.h>
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#include <peekpoke.h>
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#include <c64.h>
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#include <joystick.h>
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/*{w:24,h:21,bpp:1,brev:1}*/
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const char sprite[3*21] = {
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0x00,0x7F,0x00,0x01,0xFF,0xC0,0x03,0xFF,0xE0,
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0x03,0xE7,0xE0,0x07,0xD9,0xF0,0x07,0xDF,0xF0,
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0x07,0xD9,0xF0,0x03,0xE7,0xE0,0x03,0xFF,0xE0,
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0x03,0xFF,0xE0,0x02,0xFF,0xA0,0x01,0x7F,0x40,
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0x01,0x3E,0x40,0x00,0x9C,0x80,0x00,0x9C,0x80,
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0x00,0x49,0x00,0x00,0x49,0x00,0x00,0x3E,0x00,
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0x00,0x3E,0x00,0x00,0x3E,0x00,0x00,0x1C,0x00
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};
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// Raster wait with line argument
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void rasterWait(unsigned char line) {
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while (VIC.rasterline < line) ;
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}
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int main (void)
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{
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int n;
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int x,y;
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// install the joystick driver
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joy_install (joy_static_stddrv);
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// set background color
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VIC.bgcolor0 = 3;
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// clear interrupts to avoid glitching
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__asm__("SEI");
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// set sprite bitmap data
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for (n = 0 ; n < sizeof(sprite) ; n++) {
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POKE(832 + n, sprite[n]);
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}
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// enable 1st sprite
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VIC.spr_ena = 0x01;
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// 2x zoom 1st sprite
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VIC.spr_exp_x = 0x01;
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VIC.spr_exp_y = 0x01;
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// set address of sprite data
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POKE(2040, 13);
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// set initial x/y positions
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x = 160;
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y = 128;
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// loop
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while (1) {
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// get joystick bits
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char joy = joy_read(0);
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// move sprite based on arrow keys
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if (JOY_LEFT(joy)) --x;
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if (JOY_UP(joy)) --y;
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if (JOY_RIGHT(joy)) ++x;
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if (JOY_DOWN(joy)) ++y;
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// set VIC registers based on position
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VIC.spr0_x = x;
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VIC.spr0_y = y;
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VIC.spr_hi_x = (x & 256) ? 1 : 0;
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// change color when we collide with background
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VIC.spr0_color = (VIC.spr_bg_coll & 1) ? 10 : 0;
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// wait for end of frame
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rasterWait(255);
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}
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// uninstall joystick driver (not really necessary)
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joy_uninstall();
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return EXIT_SUCCESS;
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}
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