69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
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#include <string.h>
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#include "sprites.h"
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SpriteShadow sprshad;
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void sprite_clear(void) {
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memset(&sprshad, 0, sizeof(sprshad));
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}
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void sprite_update(byte* screenmem) {
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memcpy(screenmem + 0x3f8, sprshad.spr_shapes, 8);
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memcpy((void*)VIC.spr_pos, sprshad.spr_pos, 16);
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memcpy((void*)VIC.spr_color, sprshad.spr_color, 8);
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VIC.spr_ena = sprshad.spr_ena;
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VIC.spr_hi_x = sprshad.spr_hi_x;
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VIC.spr_exp_x = sprshad.spr_exp_x;
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VIC.spr_exp_y = sprshad.spr_exp_y;
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VIC.spr_bg_prio = sprshad.spr_bg_prio;
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VIC.spr_mcolor = sprshad.spr_mcolor;
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}
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void sprite_set_shapes(const void* sprite_data,
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byte index,
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byte count)
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{
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memcpy(get_vic_bank_start() + index * 64,
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sprite_data,
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64 * count);
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}
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const byte BITS[8] = {
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0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80
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};
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void sprite_draw(byte i, word x, byte y, byte shape) {
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byte mask = BITS[i]; // 1 << i;
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sprshad.spr_ena |= mask;
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if (x >> 8)
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sprshad.spr_hi_x |= mask;
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else
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sprshad.spr_hi_x &= ~mask;
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sprshad.spr_pos[i].x = x;
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sprshad.spr_pos[i].y = y;
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sprshad.spr_shapes[i] = shape;
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}
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byte sprite_get_closest_collision(byte i, byte spr_coll) {
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byte j;
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byte jmask = 1;
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byte dx,dy;
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if (spr_coll & BITS[i]) {
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spr_coll ^= BITS[i];
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for (j=0; j<8; j++, jmask<<=1) {
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if (spr_coll & jmask) {
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// TODO?
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dx = sprshad.spr_pos[i].x - sprshad.spr_pos[j].x + 24;
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if (dx < 48) {
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dy = sprshad.spr_pos[i].y - sprshad.spr_pos[j].y + 21;
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if (dy < 42) {
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return j;
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}
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}
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}
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}
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}
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return 0xff;
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}
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