mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-21 23:30:58 +00:00
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
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#include "common.h"
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/*{w:24,h:21,bpp:1,brev:1,count:1}*/
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const char SPRITE_DATA[64] = {
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0x0f,0xff,0x80,0x17,0xff,0x40,0x2b,0xfe,
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0xa0,0x7f,0xff,0xf0,0xff,0xc0,0x3f,0xe0,
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0x3f,0xc0,0x17,0xbe,0xc0,0x2d,0x7f,0xf0,
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0x2b,0x7f,0xf8,0x2a,0xff,0xf8,0x15,0xf6,
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0x00,0x3f,0xf8,0x00,0xfd,0xfc,0x00,0xfd,
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0xff,0x00,0xfe,0xff,0x80,0xff,0x7f,0xc0,
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0xff,0xff,0xc0,0xff,0xff,0xc0,0x0a,0xa8,
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0x00,0x0f,0xf8,0x00,0x0f,0xff,0x80,0x03,
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};
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void main(void) {
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// variables
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int x = 172; // sprite X position (16-bit)
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byte y = 145; // sprite Y position (8-bit)
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byte bgcoll; // sprite background collision flags
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byte joy; // joystick flags
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// copy sprite pattern to RAM address 0x3800
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memcpy((char*)0x3800, SPRITE_DATA, sizeof(SPRITE_DATA));
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// set sprite #0 shape entry (224)
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POKE(0x400 + 0x3f8 + 0, 0x3800 / 64);
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// set position and color
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VIC.spr_pos[0].x = 172;
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VIC.spr_pos[0].y = 145;
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VIC.spr_color[0] = COLOR_GREEN;
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// enable sprite #0
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VIC.spr_ena = 0b00000001;
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// install the joystick driver
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joy_install (joy_static_stddrv);
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// loop forever
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while (1) {
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// get joystick bits
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joy = joy_read(0);
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// move sprite based on joystick
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if (JOY_LEFT(joy)) { x -= 1; } // move left 1 pixel
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if (JOY_RIGHT(joy)) { x += 1; } // move right 1 pixel
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if (JOY_UP(joy)) { y -= 1; } // move up 1 pixel
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if (JOY_DOWN(joy)) { y += 1; } // move down 1 pixel
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// wait for end of frame
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waitvsync();
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// set sprite registers based on position
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VIC.spr_pos[0].x = x;
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VIC.spr_pos[0].y = y;
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// set X coordinate high bit
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VIC.spr_hi_x = (x & 0x100) ? 1 : 0;
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// grab and reset collision flags
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bgcoll = VIC.spr_bg_coll;
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// change color when we collide with background
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VIC.spr_color[0] = (bgcoll & 1) ?
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COLOR_LIGHTRED : COLOR_CYAN;
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}
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}
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